A freewheeling explanation
OK, I admit to some shooting from the hip on the freewheeling prop
business. Let's see if I can make a substantial contribution to the subject. First of all, you have to recognize that a propeller, airplane or boat, is just a wing going around in a circle. The relationships are a little harder to understand because the mental model you try to make in your head has to spin around. If you break it down into short strips at fixed distances from the shaft centerline however, it is fairly easy to understand. If you would first like a non-technical explanation of wings, I can recommend some articles published in Avweb, the major aviation E-zine, by a frequent contributor to this and aviation newsgroups. These articles created a firestorm of controversy among uninformed pilots but, except for some minor errors, have never been seriously questioned by an aerodynamics professional. One even uses them in his college introduction to aerodynamics. Many of the concepts apply to sails so may be of interest to this group. For example, you can find out why sails do not stall dramatically as do airplane wings. You can find these articles he http://home.maine.rr.com/rlma/Articles.htm One of the most important things to know about a wing, foil, or propeller blade, is the Angle of Attack or angle of the flow, (AOA). Here is a graph of an airplane wing showing the Coefficient of Lift (CL) at various angles. This is a wing from the article but could just as well be a prop blade, rudder, or hydrofoil. http://www.avweb.com/newspics/stalldrb_figsb5.jpg The CL x the speed squared tells you the amount of lift that will be generated per unit of area. Note that it is at a maximum at an angle of about 15 degrees. It is zero when the foil is moving edgewise through the fluid, as you would expect. It then rises to maximum as the angle increases and then starts to drop off with further increase in AOA. The region to the right of the peak is the stalled region. It's worth reading the article on stalls because you will learn that an airplane wing stalling does not let the plane drop because lift suddenly decreases. In fact, an airplane mushing into the ground with a stalled wing is generating just as much lift as one flying level but, I digress. A wing is a foil being dragged along by the airplane's engine (or gravity in the case of a glider). The un-powered prop we have all been waving our arms and shouting about is being dragged along by the sails via the hull. It is still just a wing. The graph in the picture doesn't extend far enough to show the relationship of a locked sailboat prop but you can mentally extend the graph over to the right. The CL will be very low and the angle of attack very high, up in the 70 - 80 degree range. This very inefficient foil will still be generating "lift" which is backwards and the drag slowing the boat. Now, we mentally let the prop start to turn. This is the mentally tricky part. The rotation of the prop causes the water to now seem to be coming from a different direction. This added to speed of the boat decreases the angle of attack. The faster the prop spins, the less the angle of attack. If it spins fast enough, the AOA will reverse and the prop will then be driving the boat. Only the engine can do this. An aside, this is why prop blades are twisted, the tips are moving through the water faster since they are farther from the shaft. The boat speed is the same for the full blade. It has to be twisted so the angle of attack will be the same along the length of the blade. This is only perfect at one speed but props are maximally efficient only at a specific design speed. Anyway, look back at the CL graph. Decreasing the angle of attack from the deeply stalled condition of the locked prop increases its efficiency as a lifting device and the "lift" is towards the stern, slowing the boat. At the same time, the speed of rotation is being added to the speed of the boat, further increasing "lift" which is actually drag in this case. As we let the prop spin faster by decreasing bearing friction (or the load on Larry's alternator) angle of attack continues to decrease and drag increase. At some point however, the speed will get high enough that the angle of attack will reach the peak of the CL curve. Further increases in speed and further decreases in angle of attack will now REDUCE the CL. Drag will start to drop off as maintained by several in the other thread. If the prop can reach a high enough speed, it may even drop below the drag it had when the shaft was locked. Since lift/drag is being increased by higher speed (due to rotation) at the same time it is being decreased by lower angle of attack, AOA has to be pretty low to achieve this. My contention was (although not clearly) that the typical auxiliary sailboat powertrain is unlikely to obtaine a freewheeling state of less drag than when locked. It can happen though. It may well happen in Larry's dinghy outboard experiment. We were all lining up on different sides yelling support for a simple answer and there isn't one without understanding the relationships and the specifics of RPM, pitch, and speed for each case. -- Roger Long |
Another way of looking at this issue is the analogy of turning a drill bit through a piece of wood
vs. pushing it through. If the speed of the freewheeling prop can match that of a 'screw' going through the water, it seems like that would have the minimum drag. If the speed is considerably different, it would have the effect of pulling an almost flat object, the diameter of the prop, through the water, causing appreciable drag. Seems like self-feathering props are designed to fix this problem, and outboards taken out of the water while under sail, both try to minimize drag. Sherwin D. |
Consider a yacht with a frictionless shaft.
Consider that we have taken a section thru one of the blades, and we will represent this always level to the page (because I cannot figure out how to draw it at an angle) I will represent the prop section as a horizontal line, and leave you to imagine a curved line above it.. Imagine a curved top surface above the line (forward on the boat) Leading edge ________________________________ trailing edge STAGE 1. We are under power. The engine is driving the prop blade to the left, and the result of the boat speed and propeller pitch gives a vector flow onto the blade from below (aft on the boat) at an angle of attack of say 8 degrees: \ lift up (forward) at 8 deg drag Leading edge ________________________________ trailing edge Flow (this arrow should be tilted up at 8 deg.) Our prop blade is now developing "lift" that is pushing the prop shaft forward. It is also developing drag from three causes: Friction drag from the flow of water over each side of the blade. Form drag because the thick blade has to push the water out of the way. Induced drag as a result of developing lift. STAGE 2. We just a moment ago put the transmission in neutral, and the prop has slowed to the point where the result of the boat speed and propeller pitch gives a vector flow onto the blade from the left at an angle of attack of 0 degrees: drag Leading edge ________________________________ trailing edge Flow (this arrow should be level at 0 deg.) The prop blade is now developing no lift. And is now developing drag from only two causes: Friction drag from the flow of water over each side of the blade. Form drag because the thick blade has to push the water out of the way. And these two drags combined will continue to make the prop slow until: STAGE 3. We are under sail with a freewheeling prop. Water flow from ahead is driving the prop blade to the left, because the result of the boat speed and propeller pitch gives a vector flow onto the blade from above at an angle of attack of say 8 degrees: Flow (this arrow should be tilted down at 8 deg.) Leading edge ________________________________ trailing edge / lift down (aft) at 8 deg drag Our prop blade is now developing "lift" that is pushing the prop shaft aft. It is also developing drag from three causes: Friction drag from the flow of water over each side of the blade. Form drag because the thick blade has to push the water out of the way. Induced drag as a result of developing lift. Note that the amount of lift produced by the prop will be just enough to keep the prop turning. Any more and the prop will speed up and the vector flow onto the blade will reduce, reducing the lift. Any less and the vector will increase, increasing the lift. Note that what I have called lift produced by the freewheeling prop is actually drag when resolved to the boat. Note that the section of the prop is upside down when freewheeling and the lift drag characteristic will be quite a lot worse than when the flow is from below in the imaginary drawings above. STAGE 4. If you now introduce some shaft friction or load, the prop will slow until the angle of attack of the prop produces enough lift to keep the prop turning. If the shaft friction or load is great enough this may well mean that the lift that the prop has to develop is greater than that if the blade were locked and thus fully stalled. NOTE. What I have tried to describe here is nothing like what happens on a helicopter or autogyro where the angle of attack is always from the bottom of the blade. NOTE. Just a thought: A locked boat propeller with a disc area ratio of 60 % will have more effect surely than a locked airplane propeller with its disc area ratio of 10% |
"Roger Long" skrev i en meddelelse ... OK, I admit to some shooting from the hip on the freewheeling prop business. Let's see if I can make a substantial contribution to the subject. First of all, you have to recognize that a propeller, airplane or boat, is just a wing going around in a circle. The relationships are a little harder to understand because the mental model you try to make in your head has to spin around. If you break it down into short strips at fixed distances from the shaft centerline however, it is fairly easy to understand. If you would first like a non-technical explanation of wings, I can recommend some articles published in Avweb, the major aviation E-zine, by a frequent contributor to this and aviation newsgroups. These articles created a firestorm of controversy among uninformed pilots but, except for some minor errors, have never been seriously questioned by an aerodynamics professional. One even uses them in his college introduction to aerodynamics. Many of the concepts apply to sails so may be of interest to this group. For example, you can find out why sails do not stall dramatically as do airplane wings. You can find these articles he http://home.maine.rr.com/rlma/Articles.htm SNIP -- Roger Long Thank you for most interesting input Roger ... It seems to be right, that "all complex problems has at least one simple solution . . . . that does not work". Unfortunately, I do not get a response, when I try to use the above link ... Is it closed for Danes? best regards -- Flemming Torp |
Unfortunately, I do not get a response, when I try to use the above
link ... Is it closed for Danes? Yes, some of us are still upset about the Viking invasions:) Seriously though, I have no idea why. I've had people read it all over the world. Try later. -- Roger Long |
"Roger Long" skrev i en meddelelse ... Unfortunately, I do not get a response, when I try to use the above link ... Is it closed for Danes? Yes, some of us are still upset about the Viking invasions:) As Carlsberg is saying in one of their adds: They took our wiwes, but gave us the beer ... Sorry. Seriously though, I have no idea why. I've had people read it all over the world. Try later. -- Roger Long And you are sure it is as written in your message? I've tried more than ten times, and I just get the message that the page cannot be shown ... -- Flemming Torp |
I just clicked them both again directly from my post.
Try these direct links through Avweb. http://www.avweb.com/news/airman/183261-1.html http://www.avweb.com/news/airman/184307-1.html You'll have to look in the second one for the CL diagram. -- Roger Long "Flemming Torp" fletopkanelbolle2rp.danmark wrote in message . .. "Roger Long" skrev i en meddelelse ... Unfortunately, I do not get a response, when I try to use the above link ... Is it closed for Danes? Yes, some of us are still upset about the Viking invasions:) As Carlsberg is saying in one of their adds: They took our wiwes, but gave us the beer ... Sorry. Seriously though, I have no idea why. I've had people read it all over the world. Try later. -- Roger Long And you are sure it is as written in your message? I've tried more than ten times, and I just get the message that the page cannot be shown ... -- Flemming Torp |
"Roger Long" skrev i en meddelelse ... I just clicked them both again directly from my post. Try these direct links through Avweb. http://www.avweb.com/news/airman/183261-1.html http://www.avweb.com/news/airman/184307-1.html You'll have to look in the second one for the CL diagram. -- Roger Long Thank you - both working! But still no answer on http://home.maine.rr.com/rlma/Articles.htm ?? -- Flemming Torp 'kun en tåbe frygter ikke haven' |
Please click this:
http://home.maine.rr.com/rlma and let me know what happens. I'm curious if my site is being censored in Denmark (maybe due to all those sexy looking boats). If you do get the main page to open, click "Roger Long" and then "Aviation Articles". -- Roger Long |
Roger,
Everything works just fine with animation and nice pictures etc. etc. I also tried the original link in your former message once more, and it works just fine in a fraction of a second ... I have made no changes to my set up ... Maybe your administration is defending you from new "invasions" from Denmark??? Very nice homepage by the way! Best regards Flemming "Roger Long" skrev i en meddelelse ... Please click this: http://home.maine.rr.com/rlma and let me know what happens. I'm curious if my site is being censored in Denmark (maybe due to all those sexy looking boats). If you do get the main page to open, click "Roger Long" and then "Aviation Articles". -- Roger Long |
"Flemming Torp" fletopkanelbolle2rp.danmark wrote in
: home.maine.rr.com Flemming. Bring up your MSDOS (or whatever XP calls it now) window and type in: tracert home.maine.rr.com you should see something like this: Tracing route to home.maine.rr.com [154.6.66.43] over a maximum of 30 hops: 1 1 ms 1 ms 1 ms 192.168.0.1 2 15 ms 16 ms 17 ms 69.73.126.1 3 17 ms 13 ms 16 ms 24.214.0.178 4 13 ms 18 ms 15 ms ge.0-1-0.cr-Char.SC.knology.net [24.96.110.57] 5 29 ms 27 ms 29 ms so.2-1-1.cr-Atla.GA.US.knology.net [24.214.0.5] 6 25 ms 328 ms 30 ms unknown.Level3.net [63.211.121.5] 7 28 ms 26 ms 27 ms so-0-3-0.bbr1.Atlanta1.Level3.net [4.68.96.9] 8 26 ms 30 ms 25 ms ge-11-0.hsa1.Atlanta1.Level3.net [4.68.103.36] 9 27 ms 25 ms 29 ms s0.homecom.bbnplanet.net [4.24.209.50] 10 28 ms 27 ms 27 ms home.maine.rr.com [154.6.66.43] Trace complete. If it goes berserk with lots of * showing a broken link, just let it keep trying. His webpage on RoadRunner in Maine works great and you can see my link to it is also good from South Carolina. Let's see where the link between your computer and his webpage is broken. It is also very helpful if you copy the trace and send it to your internet provider to help their network people get the problem fixed from their upstream providers. If that trace fails to start at all, the problem is in your internet provider's DNS, the server that converts home.maine.rr.com into the IP address 154.6.66.43 for your computer to all it. Computers only call IP addresses and if the server can't find it, it'll just dead end or tell you it doesn't exist. If the first trace fails try: tracert 154.6.66.43 If that trace does work, contact your internet provider and tell them their DNS server is having a bad day and to please refresh his DNS data. Danmark isn't China. I don't think your socialists have anything blocked...(c; |
"Flemming Torp" fletopkanelbolle2rp.danmark wrote in
: Thank you - both working! But still no answer on http://home.maine.rr.com/rlma/Articles.htm ?? Still curious, I looked at the header in your message and the idiots running tele.dk are posting your own IP address in every one of your messages (62.252.180.211) for the krackers to attack. I did a trace to your house using Sam Spade, a free internet traffic tool from www.samspade.org which is much more sophisticated than Windows' awful tool. You can download it free if you like. From the trace below, you can see the path from my network in South Carolina, USA to your house. Steps 6 through 10 give no response to Sam's pings, but DO work as the traces in the path below them are responding through them fine. The provider just has his ping response turned off because there are several worms attacking with pings on the internet this year. Ours was all turned off for months. Step 21, at the bottom of the trace is YOU, your computer!...(c; The 170 millisecond time your system responds to my pings is quite respectable for Europe. Tele.dk has a long network between tascali.net, their upstream internet provider, and your home, steps 13 through 21. I bet you won't get a response to the tracert home.maine.rr.com in my previous method. This would indicate their DNS server is hosed...not working properly. I bet if you access the troublesome webpage with: http://154.6.66.43/rlma/Articles.htm instead, you will see this webpage fine. 154.6.66.43 is the IP address of this web server, according to my DNS server. See if this webpage responds....(c; Boat stuff isn't all I like to play with....(c; 06/08/05 20:14:57 Fast traceroute 62.242.180.211 Trace 62.242.180.211 ... 1 192.168.0.1 1ms 1ms 1ms TTL: 0 (No rDNS) 2 69.73.126.1 14ms 15ms 13ms TTL: 0 (No rDNS) 3 24.214.0.178 13ms 15ms 13ms TTL: 0 (No rDNS) 4 24.96.110.57 12ms 15ms 14ms TTL: 0 (ge.0-1-0.cr- Char.SC.knology.net bogus rDNS: host not found [authoritative]) 5 24.214.0.5 25ms 24ms 26ms TTL: 0 (so.2-1-1.cr- Atla.GA.US.knology.net bogus rDNS: host not found [authoritative]) 6 No Response * * * 7 No Response * * * 8 No Response * * * 9 No Response * * * 10 No Response * * * 11 213.200.66.121 45ms 41ms 42ms TTL: 0 (ge-4-0- 4.was10.ip.tiscali.net bogus rDNS: host not found [authoritative]) 12 213.200.81.101 112ms 113ms 111ms TTL: 0 (so-4-0- 0.lon12.ip.tiscali.net bogus rDNS: host not found [authoritative]) 13 195.66.224.64 129ms 129ms 129ms TTL: 0 (ge1- 0.1000M.ldn2nxg1.ip.tele.dk ok) 14 80.63.82.6 130ms 133ms 127ms TTL: 0 (pos5- 0.2488M.ldn2nxg2.ip.tele.dk ok) 15 195.249.2.41 135ms 132ms 228ms TTL: 0 (pos4- 0.2488M.ffm2nxg1.ip.tele.dk ok) 16 195.249.14.50 161ms 161ms 164ms TTL: 0 (pos0- 0.2488M.ffm2nxg2.ip.tele.dk ok) 17 80.63.82.14 165ms 163ms 163ms TTL: 0 (so-1-3- 0.2488M.albnxu1.ip.tele.dk ok) 18 80.63.80.122 163ms 163ms 163ms TTL: 0 (pos3- 0.2488M.virnxg1.ip.tele.dk ok) 19 83.88.13.110 162ms 161ms 162ms TTL: 0 (pos0- 0.622M.virnxg4.ip.tele.dk ok) 20 83.88.7.149 161ms 163ms 163ms TTL: 0 (fe0-0- 40.100M.virnxx14.ip.tele.dk ok) 21 62.242.180.211 178ms 178ms 179ms TTL:235 (cpe.atm2-0- 112315.0x3ef2b4d3.virnxx14.customer.tele.dk ok) |
I bet you won't get a response to the tracert home.maine.rr.com in
my previous method. This would indicate their DNS server is hosed...not working properly. Pretty good sluthing, Larry. I'm suddenly having some intermittent trouble bringing up my own page and others from here. Road Runner has generally been rock solid and has the best technical support I've ever encountered but they to have occasional hiccups. -- Roger Long |
"Roger Long" wrote in
: Pretty good sluthing, Larry. I'm suddenly having some intermittent trouble bringing up my own page and others from here. Road Runner has generally been rock solid and has the best technical support I've ever encountered but they to have occasional hiccups. I have several friends on RR in Summerville, SC, just up from Charleston, a suburb. Time-Warner owns the cable company in Summerville. Your experience matches theirs. Their local installers have no clue, but the service works quite well, once you get it running. I'm very lucky to have access to two cable companies, Comcrap and Knology, here. Comcrap isn't an issue with 2G/month Usenet limit. How awful. Knology is a brand new, all fiber to the neighborhood, even offering cable telephone. It's been down 3 minutes in 3 years, now. Amazing service from a cable company. The local reps are very knowledgeable and helpful. I only buy internet $55/mo from them. I don't pay anyone to watch advertising (TV) and cut the wires on telephone many years ago. Noone needs a home phone with cellular, now. One of life's pleasures was calling Bell$outh and asking them to come remove all their wires from my house...(c; Unfortunately, RR seems to have idiots running usenet, too. Your IP, 24.198.203.135, is in your header. I assume nyroc is Rochester from your name server lookup. Your firewall is working fine, no pings. From Knology to your UBR06 node is really fast between us...(c; 06/09/05 08:13:40 Fast traceroute 24.198.203.135 Trace 24.198.203.135 ... 1 192.168.0.1 1ms 1ms 1ms TTL: 0 (No rDNS) 2 69.73.126.1 15ms 12ms 17ms TTL: 0 (No rDNS) 3 24.214.0.178 14ms 15ms 13ms TTL: 0 (No rDNS) 4 24.96.110.57 19ms 14ms 13ms TTL: 0 (ge.0-1-0.cr- Char.SC.knology.net bogus rDNS: host not found [authoritative]) 5 24.214.0.5 26ms 27ms 25ms TTL: 0 (so.2-1-1.cr- Atla.GA.US.knology.net bogus rDNS: host not found [authoritative]) 6 63.211.121.5 27ms 26ms 25ms TTL: 0 (unknown.Level3.net fraudulent rDNS) 7 4.68.103.65 25ms 27ms 27ms TTL: 0 (ae-1- 53.bbr1.Atlanta1.Level3.net ok) 8 209.247.8.69 42ms 43ms 45ms TTL: 0 (so-1-0- 0.mp1.Philadelphia1.Level3.net ok) 9 209.247.9.254 43ms 45ms 47ms TTL: 0 (so-7-0- 0.gar1.Philadelphia1.Level3.net ok) 10 4.78.148.2 72ms 53ms 55ms TTL: 0 (ROADRUNNER.gar1.Level3.net ok) 11 24.92.224.202 71ms 72ms 67ms TTL: 0 (rdc-24-92-224- 202.nyroc.rr.com ok) 12 24.25.160.137 67ms 72ms 70ms TTL: 0 (gig0-3.ptldmeptl- ubr06.nyroc.rr.com ok) 13 No Response * * * ^^^^^^^^^^^ nice firewall...(c; |
I appreciate the comments on the firewall. I've worked hard to lock
this machine down after my early experience. Soon after hooking up to always on broadband, with Zone Alarm as my only defense, the machine got very, very slow. I defragged the hard disk and tried all sorts of other things. Cable was almost as slow as dial up. Then, Zone Alarm popped up a program I'd never seen before. It did some checking and figured out that it wanted to look in my internet temporary files. I also found my previously 15% utilized hard disk full. I looked and found gigs of porno movies stashed on my disk, child porno and other really bad stuff. Someone had turned my machine into a server for their filth. I got religion and a hardware firewall backed up by software. I also made a text editor the default program for running all scripts and similar programs. Oops, I just broke my pledge to stay on topic. BTW, the boat just went in the water today. Look for post and pictures later. -- Roger Long |
"Roger Long" wrote in
: Zone Alarm Zone Alarm, or any other program running UNDER the Swiss Cheeze operating system (Windoze) is useless, in reality. It keeps popping up those panic windows to keep you hooked up to its owners....or their spammers in some cases... If you want to be safe? Put a net safe router between the broadband modem and the Swiss Cheeze operating system. Then "they" can't really get at it, because they have no hole into the operating system, unless the worm running in your machine opens a hole in the router.... You can do a lot to protect yourself there, too. The worst one is Outlook or Outlook Express, the target email client of every cracker in the world. As it is PART of the operating system, directly connected to the other target, Internet Explorer, by design to give the spammers access to every private piece of data on your system, you can stop all this madness by getting rid of it....for free! Download and use Pegasus from David Harris in New Zealand. http://www.pmail.com/ Pegasus is one of the oldest email clients on the net.....and not connected to anything. It won't run the worms or even open the spammers' email bombs unless YOU tell it to. The worms are pretty easy to stop. Open Control Panel and uninstall pieces of Windows' spammer controls.... Email worms run under Visual Basic Scripting, a little operating system Billy puts in Windoze so the companies can take control of your system without your permission. No VBS, No control, no .vbs worms can run. We don't tell you about it, of course, because "we" want to control you. Billy calls it "Windows Scripting Host" under ol' Win98/95/ME but has further obscured the name in XP, I think. It's one of Windows' "accessories". While we're uninstalling the crapware, ActiveX and Javascript, two more "controls" webpages use to take over your system, can be uninstalled or disabled. Java, itself, has long been hacked. Without access to YOUR controls, many webpages will simply refuse to give you access. Do you really need to give them control just to look at their content or shop at their online stores? I think NOT. Once you've gotten rid of these 4 dangerous items, browsing becomes safer. I like Norton Anti Virus, with a paid-for subscription, to have some really smart hackers on my side of the fence. You don't need the firewall, now that you have a fully-functional ROUTER firewall protecting the whole machine. Antivirus protects you from downloading some nasties from Usenet or .exe/bat/com/etc. files someone you probably know who has an infected machine will send you without even knowing about it. Their installed virus uses THEIR Outlook Express address book with YOUR email address in it to propagate a virus email with their own headers. NAV protects from thousands of these. (www.symantec.com) It's worth the price.... The spam/spyware has two free tools that work great. Ad Aware Standard edition will rid you of most of them. Spybot will scrape the other crap off your Windows Registry, the directory used to tell Windows what it can do. I don't recommend using Spybot, wholesale. Sometimes it cleans so well it cleans stuff Windows expects to find....your system won't boot if you're not very careful. Get the router.....Zone Alarm is near worthless.... I like Netgear's routers over Linksys. I have both. Somewhere behind my desk, hanging by its wires, is a Netgear RP-114 router that has worked perfect since I first turned it on several years ago. I can probably find it if I crawl around back there. It used to be on my desk....????? I know it's working because it read your message...(c; Drive safe on the net. Oh, Usenet. I like Xnews from xnews.newsguy.com, not because it's some wonderful system, but because it downloads usenet binaries in any format for months without crashing even Windoze. I'm typing on it, now.... |
Excellent advice to all. I think you missed the (not very obvious)
point above that I have the router, Norton, and all the other stuff you mention. So far, I haven't had anything get in although I do run Outlook Express. VBS scripts and anything like that just pop up in Notepad and give me a chance to decide if I want to run them. -- Roger Long "Larry W4CSC" wrote in message ... "Roger Long" wrote in : Zone Alarm Zone Alarm, or any other program running UNDER the Swiss Cheeze operating system (Windoze) is useless, in reality. It keeps popping up those panic windows to keep you hooked up to its owners....or their spammers in some cases... If you want to be safe? Put a net safe router between the broadband modem and the Swiss Cheeze operating system. Then "they" can't really get at it, because they have no hole into the operating system, unless the worm running in your machine opens a hole in the router.... You can do a lot to protect yourself there, too. The worst one is Outlook or Outlook Express, the target email client of every cracker in the world. As it is PART of the operating system, directly connected to the other target, Internet Explorer, by design to give the spammers access to every private piece of data on your system, you can stop all this madness by getting rid of it....for free! Download and use Pegasus from David Harris in New Zealand. http://www.pmail.com/ Pegasus is one of the oldest clients on the net.....and not connected to anything. It won't run the worms or even open the spammers' email bombs unless YOU tell it to. The worms are pretty easy to stop. Open Control Panel and uninstall pieces of Windows' spammer controls.... Email worms run under Visual Basic Scripting, a little operating system Billy puts in Windoze so the companies can take control of your system without your permission. No VBS, No control, no .vbs worms can run. We don't tell you about it, of course, because "we" want to control you. Billy calls it "Windows Scripting Host" under ol' Win98/95/ME but has further obscured the name in XP, I think. It's one of Windows' "accessories". While we're uninstalling the crapware, ActiveX and Javascript, two more "controls" webpages use to take over your system, can be uninstalled or disabled. Java, itself, has long been hacked. Without access to YOUR controls, many webpages will simply refuse to give you access. Do you really need to give them control just to look at their content or shop at their online stores? I think NOT. Once you've gotten rid of these 4 dangerous items, browsing becomes safer. I like Norton Anti Virus, with a paid-for subscription, to have some really smart hackers on my side of the fence. You don't need the firewall, now that you have a fully-functional ROUTER firewall protecting the whole machine. Antivirus protects you from downloading some nasties from Usenet or .exe/bat/com/etc. files someone you probably know who has an infected machine will send you without even knowing about it. Their installed virus uses THEIR Outlook Express address book with YOUR email address in it to propagate a virus email with their own headers. NAV protects from thousands of these. (www.symantec.com) It's worth the price.... The spam/spyware has two free tools that work great. Ad Aware Standard edition will rid you of most of them. Spybot will scrape the other crap off your Windows Registry, the directory used to tell Windows what it can do. I don't recommend using Spybot, wholesale. Sometimes it cleans so well it cleans stuff Windows expects to find....your system won't boot if you're not very careful. Get the router.....Zone Alarm is near worthless.... I like Netgear's routers over Linksys. I have both. Somewhere behind my desk, hanging by its wires, is a Netgear RP-114 router that has worked perfect since I first turned it on several years ago. I can probably find it if I crawl around back there. It used to be on my desk....????? I know it's working because it read your message...(c; Drive safe on the net. Oh, Usenet. I like Xnews from xnews.newsguy.com, not because it's some wonderful system, but because it downloads usenet binaries in any format for months without crashing even Windoze. I'm typing on it, now.... |
"Roger Long" wrote in
: Outlook Express Every time I see that typed I get chills. I find it something like standing in a RED Santa suit in a bullring waving my arms up and down....or wearing a sign that says, "KICK ME HARD!" in a biker bar. -- Larry You know you've had a rough night when you wake up and your outlined in chalk. |
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