Home |
Search |
Today's Posts |
#31
posted to rec.boats,rec.boats.cruising
|
|||
|
|||
Capsize Prevention
"Wayne.B" wrote in message ... On Sun, 18 Oct 2009 20:05:02 -0400, "mmc" wrote: On my Traveler 32' the righting moment was 165 degrees, meaning if the boat completely capsized, it would recover on its own once the hull rotated 16 degrees from exactly upside down. Like when the next wave pushed the boat sideways and the resistance offered by the rig caused the hull to rotate on it's long axis. Once the mast of a monohull gets rotated past horizontal, i.e. well into the water, it usually breaks. I'd think that would depend on the mast configuration and rig strength, right? For instance, a Westsail 32 would probably come through something like this in a lot better shape than a Hunter 30. |
#32
posted to rec.boats,rec.boats.cruising
|
|||
|
|||
Capsize Prevention
"Bill McKee" wrote in message
m... "Edgar" wrote in message ... "Jeff" wrote in message ... I'd be curious to see the numbers. Canoe deaths were 80 last year, over 10% of the total; while kayak deaths were 34, or 5%. However, Kayak sales are about 4 times canoes, so there is a discrepancy. The two together have been selling about half a million a year recently, though falling off last year. So its quite possible that the number of "paddle boats" out there are equal to the number of small open power boats (or at least a significant percentage of them) which were involved in 350 deaths last year. So I could believe that canoes are responsible for a disproportional number of deaths, but not kayaks. My hunch is that most kayakers wear PFDs, but many canoe users are actually fishing and don't think they are at risk. Although I often wear a PFD while kayaking, I have trouble convincing my wife to do so, because we almost always kayak in very protecting fla****er, often only a few feet deep. I would expect a number of any deaths reported from canoes and kayaks are due to them being run down by fast power boats in the hands of idiots. Actually it is the paddler that is most often the idiot. I almost ran over a shell in a light fog in San Francisco Bay a couple years ago. Guy is in a white shell, wearing a white shirt, and is in the middle of the channel area. Luckily it was me, going maybe 20 mph and not the ferryboat doing 35 knots. You could hardly see the idiot at 30'. Is why my next yak is going to be a bright color. And I wear a bright red PFD when paddling. Sort of the same mentality as a lot of sailboaters. I am in a sailboat, I have the right of way. My wife got hit by a sailboat in Mission Bay, SD. while in a yak. Could not get completely out of the way. He is in the back, f'n around with something and the tiller is locked and he is doing 10-12 and is not looking at all where he is headed. I did not have the VHF with me at the time or he would be explaining the hit-run to the police and lifeguards. Could not get his numbers and the other witness didn't either. I have had sailboats with the motor running turn directly in front of me with a 90 degree term. And other sailboaters say, maybe he was not under power and only charging battery. BS. Motor running, is a power boat. Same as I heard a sailboater claim he had the right of way over a large tanker entering SF Bay. He will be both dead, and wrong. Technically, the engine needs to be engaged for it to be under power, but I agree with you. If I turn on my engine, even if it's in neutral, I consider myself a powerboat. I figure that the other guy is going to see the raw water coming out, and that might be enough to fool him. Why take a chance.... -- "j" ganz @@ www.sailnow.com |
#33
posted to rec.boats,rec.boats.cruising
|
|||
|
|||
Capsize Prevention
In article m, mmc wrote:
Don't know if anyone else has pitched in on this. A ballasted keel mono hull sail boat wants to right itself the more it heels due to the ballast and leverage. Monohulls get knocked down at sea and stand back up on thier own, unlike thier multihull counterparts. I guess if a sailor is real lucky and the hull is lying across the wind and you get a good gust it could push the boat upright but if the sails are still set, it might just keep going over and back into the same predicament. Wind doesn't capsize keelboats, waves do. Wind may knock it flat, but nowhere near enough to capsize. Once the boat has been knocked flat the wind no longer has any effect, as soon as the gust has passed the boat comes back up-righ. If a keelboat does capsize, and, as I think you're saying, the wind against the keel is enough to right the boat, all a strong wind can do is knock the boat down again, not capsize it. Of course, anything that's not ballasted is a going to experience things differently. The flotation at the masthead is an idea that Hobie came out with way back when, necessary to keep the boat from "turtling" when the mast fills with water. With a Hobie, turtling would be a huge PITA, with a larger multi nothing short of a crane is going to make things right (or upright haha). There's a thing called "righting moment" when talking about mono hulls which is the point the hull has to attain in order for the boat to recover from turtling. On my Traveler 32' the righting moment was 165 degrees, I think you mean the angle of vanishing stability. The "righting moment" is completely different, it isn't a point, it's a measure of force that is calculated by multiplying the distance between the centre of gravity and centre of buoyancy by the boat mass. Your AVS may be 165 degrees (that's very high). What that means is that when the boat is tipped that far from upright it is as likely to fully capsize as it is likely to come back upright. The correlation of this is that, as you say, tipping from inverted by more than 15 degrees would cause your boat to right. meaning if the boat completely capsized, it would recover on its own once the hull rotated 16 degrees from exactly upside down. Like when the next wave pushed the boat sideways and the resistance offered by the rig caused the hull to rotate on it's long axis. Justin. -- Justin C, by the sea. |
#34
posted to rec.boats,rec.boats.cruising
|
|||
|
|||
Capsize Prevention
On Mon, 19 Oct 2009 12:44:15 -0700, "Capt. JG"
wrote: If I turn on my engine, even if it's in neutral, I consider myself a powerboat. That is the way the rules are being taught and interpreted these days. |
#35
posted to rec.boats,rec.boats.cruising
|
|||
|
|||
Capsize Prevention
"Edgar" wrote in message ... "Jeff" wrote in message ... I'd be curious to see the numbers. Canoe deaths were 80 last year, over 10% of the total; while kayak deaths were 34, or 5%. However, Kayak sales are about 4 times canoes, so there is a discrepancy. The two together have been selling about half a million a year recently, though falling off last year. So its quite possible that the number of "paddle boats" out there are equal to the number of small open power boats (or at least a significant percentage of them) which were involved in 350 deaths last year. So I could believe that canoes are responsible for a disproportional number of deaths, but not kayaks. My hunch is that most kayakers wear PFDs, but many canoe users are actually fishing and don't think they are at risk. Although I often wear a PFD while kayaking, I have trouble convincing my wife to do so, because we almost always kayak in very protecting fla****er, often only a few feet deep. I would expect a number of any deaths reported from canoes and kayaks are due to them being run down by fast power boats in the hands of idiots. Actually it is the paddler that is most often the idiot. I almost ran over a shell in a light fog in San Francisco Bay a couple years ago. Guy is in a white shell, wearing a white shirt, and is in the middle of the channel area. Luckily it was me, going maybe 20 mph and not the ferryboat doing 35 knots. You could hardly see the idiot at 30'. Is why my next yak is going to be a bright color. And I wear a bright red PFD when paddling. Sort of the same mentality as a lot of sailboaters. I am in a sailboat, I have the right of way. My wife got hit by a sailboat in Mission Bay, SD. while in a yak. Could not get completely out of the way. He is in the back, f'n around with something and the tiller is locked and he is doing 10-12 and is not looking at all where he is headed. I did not have the VHF with me at the time or he would be explaining the hit-run to the police and lifeguards. Could not get his numbers and the other witness didn't either. I have had sailboats with the motor running turn directly in front of me with a 90 degree term. And other sailboaters say, maybe he was not under power and only charging battery. BS. Motor running, is a power boat. Same as I heard a sailboater claim he had the right of way over a large tanker entering SF Bay. He will be both dead, and wrong. |
#36
posted to rec.boats,rec.boats.cruising
|
|||
|
|||
Capsize Prevention
"Wayne.B" wrote in message
... On Mon, 19 Oct 2009 12:44:15 -0700, "Capt. JG" wrote: If I turn on my engine, even if it's in neutral, I consider myself a powerboat. That is the way the rules are being taught and interpreted these days. Taught by whom? Not out here, as far as I know. -- "j" ganz @@ www.sailnow.com |
#37
posted to rec.boats,rec.boats.cruising
|
|||
|
|||
Capsize Prevention
"Bill McKee" wrote in message
... "Capt. JG" wrote in message easolutions... "Bill McKee" wrote in message m... "Edgar" wrote in message ... "Jeff" wrote in message ... I'd be curious to see the numbers. Canoe deaths were 80 last year, over 10% of the total; while kayak deaths were 34, or 5%. However, Kayak sales are about 4 times canoes, so there is a discrepancy. The two together have been selling about half a million a year recently, though falling off last year. So its quite possible that the number of "paddle boats" out there are equal to the number of small open power boats (or at least a significant percentage of them) which were involved in 350 deaths last year. So I could believe that canoes are responsible for a disproportional number of deaths, but not kayaks. My hunch is that most kayakers wear PFDs, but many canoe users are actually fishing and don't think they are at risk. Although I often wear a PFD while kayaking, I have trouble convincing my wife to do so, because we almost always kayak in very protecting fla****er, often only a few feet deep. I would expect a number of any deaths reported from canoes and kayaks are due to them being run down by fast power boats in the hands of idiots. Actually it is the paddler that is most often the idiot. I almost ran over a shell in a light fog in San Francisco Bay a couple years ago. Guy is in a white shell, wearing a white shirt, and is in the middle of the channel area. Luckily it was me, going maybe 20 mph and not the ferryboat doing 35 knots. You could hardly see the idiot at 30'. Is why my next yak is going to be a bright color. And I wear a bright red PFD when paddling. Sort of the same mentality as a lot of sailboaters. I am in a sailboat, I have the right of way. My wife got hit by a sailboat in Mission Bay, SD. while in a yak. Could not get completely out of the way. He is in the back, f'n around with something and the tiller is locked and he is doing 10-12 and is not looking at all where he is headed. I did not have the VHF with me at the time or he would be explaining the hit-run to the police and lifeguards. Could not get his numbers and the other witness didn't either. I have had sailboats with the motor running turn directly in front of me with a 90 degree term. And other sailboaters say, maybe he was not under power and only charging battery. BS. Motor running, is a power boat. Same as I heard a sailboater claim he had the right of way over a large tanker entering SF Bay. He will be both dead, and wrong. Technically, the engine needs to be engaged for it to be under power, but I agree with you. If I turn on my engine, even if it's in neutral, I consider myself a powerboat. I figure that the other guy is going to see the raw water coming out, and that might be enough to fool him. Why take a chance.... -- "j" ganz @@ www.sailnow.com You get in a crash and and the motor is running and claim you were not in gear, and are a sailboat, you are going to lose! As long as the motor is on, your are technically a power boat. You could reach over and put it in gear. Same as if just before the crash you pop it into neutral. If an anchored powerboat is considered a powerboat when anchored, you think the court will let you get away claiming under sail status when the engine is running? No dispute from me, except that "technically" you're not a powerboat, unless the engine is engaged in driving the boat. Not sure what the anchor comment has to do with it, since you're not (obviously) underway. If you're unclear about what the rules actually say on the matter, look it up. I'm certain that you're right, however, when it comes to how a court would react. That's a seperate question, which is why I consider myself a powerboat if I have the engine on. It's not technically accurate, but it is accurate in practice. -- "j" ganz @@ www.sailnow.com |
#38
posted to rec.boats.cruising
|
|||
|
|||
Capsize Prevention
On Mon, 19 Oct 2009 21:01:01 +0100, Justin C
wrote: In article m, mmc wrote: Don't know if anyone else has pitched in on this. A ballasted keel mono hull sail boat wants to right itself the more it heels due to the ballast and leverage. Monohulls get knocked down at sea and stand back up on thier own, unlike thier multihull counterparts. I guess if a sailor is real lucky and the hull is lying across the wind and you get a good gust it could push the boat upright but if the sails are still set, it might just keep going over and back into the same predicament. Wind doesn't capsize keelboats, waves do. Wind may knock it flat, but nowhere near enough to capsize. Once the boat has been knocked flat the wind no longer has any effect, as soon as the gust has passed the boat comes back up-righ. If a keelboat does capsize, and, as I think you're saying, the wind against the keel is enough to right the boat, all a strong wind can do is knock the boat down again, not capsize it. Assuming any sort of sailing yacht, i.e., something other then a day sailor,having an enclosed cabin, a simple wave does not capsize the boat. Breaking waves, yes; or waves that are so high that the boat gains excessive speed on the downward slope so that it digs its nose in the next wave and pitch poles, but even a tsunami wave doesn't appear to roll a sail boat over - at least not in Thailand :-) Of course, anything that's not ballasted is a going to experience things differently. The flotation at the masthead is an idea that Hobie came out with way back when, necessary to keep the boat from "turtling" when the mast fills with water. With a Hobie, turtling would be a huge PITA, with a larger multi nothing short of a crane is going to make things right (or upright haha). There's a thing called "righting moment" when talking about mono hulls which is the point the hull has to attain in order for the boat to recover from turtling. On my Traveler 32' the righting moment was 165 degrees, I think you mean the angle of vanishing stability. The "righting moment" is completely different, it isn't a point, it's a measure of force that is calculated by multiplying the distance between the centre of gravity and centre of buoyancy by the boat mass. Your AVS may be 165 degrees (that's very high). What that means is that when the boat is tipped that far from upright it is as likely to fully capsize as it is likely to come back upright. The correlation of this is that, as you say, tipping from inverted by more than 15 degrees would cause your boat to right. meaning if the boat completely capsized, it would recover on its own once the hull rotated 16 degrees from exactly upside down. Like when the next wave pushed the boat sideways and the resistance offered by the rig caused the hull to rotate on it's long axis. Justin. Cheers, Bruce (bruceinbangkokatgmaildotcom) |
#39
posted to rec.boats,rec.boats.cruising
|
|||
|
|||
Capsize Prevention
On Mon, 19 Oct 2009 17:32:26 -0400, Wayne.B
wrote: On Mon, 19 Oct 2009 12:44:15 -0700, "Capt. JG" wrote: If I turn on my engine, even if it's in neutral, I consider myself a powerboat. That is the way the rules are being taught and interpreted these days. Not really. Even Americas Cup racers are permitted to run an engine for charging purposes while racing. I have an outboard on my boat. If I am just noodling around and not trying to set any speed records, I may leave the engine in the water while sailing, even though it is not running. That may look like I'm motoring to you, but if you don't see a black sphere hanging from my spreaders, or a steaming light, I'm a sailboat. That's the LAW. If I am running my engine in neutral, I am still 100% a sailboat. That is the law. It is the responsibility of all mariners to pay attention to lights and dayshapes. Also bear in mind that a boat that is motoring with it's sails up is somewhat restricted in it's ability to manuver. Power boats can slow, stop, and turn immediately in any direction. A motorsailer, not so much. |
#40
posted to rec.boats.cruising
|
|||
|
|||
Capsize Prevention
On Mon, 19 Oct 2009 17:47:59 -0700, "Bill McKee"
wrote: "Capt. JG" wrote in message reasolutions... "Bill McKee" wrote in message m... "Edgar" wrote in message ... "Jeff" wrote in message ... I'd be curious to see the numbers. Canoe deaths were 80 last year, over 10% of the total; while kayak deaths were 34, or 5%. However, Kayak sales are about 4 times canoes, so there is a discrepancy. The two together have been selling about half a million a year recently, though falling off last year. So its quite possible that the number of "paddle boats" out there are equal to the number of small open power boats (or at least a significant percentage of them) which were involved in 350 deaths last year. So I could believe that canoes are responsible for a disproportional number of deaths, but not kayaks. My hunch is that most kayakers wear PFDs, but many canoe users are actually fishing and don't think they are at risk. Although I often wear a PFD while kayaking, I have trouble convincing my wife to do so, because we almost always kayak in very protecting fla****er, often only a few feet deep. I would expect a number of any deaths reported from canoes and kayaks are due to them being run down by fast power boats in the hands of idiots. Actually it is the paddler that is most often the idiot. I almost ran over a shell in a light fog in San Francisco Bay a couple years ago. Guy is in a white shell, wearing a white shirt, and is in the middle of the channel area. Luckily it was me, going maybe 20 mph and not the ferryboat doing 35 knots. You could hardly see the idiot at 30'. Is why my next yak is going to be a bright color. And I wear a bright red PFD when paddling. Sort of the same mentality as a lot of sailboaters. I am in a sailboat, I have the right of way. My wife got hit by a sailboat in Mission Bay, SD. while in a yak. Could not get completely out of the way. He is in the back, f'n around with something and the tiller is locked and he is doing 10-12 and is not looking at all where he is headed. I did not have the VHF with me at the time or he would be explaining the hit-run to the police and lifeguards. Could not get his numbers and the other witness didn't either. I have had sailboats with the motor running turn directly in front of me with a 90 degree term. And other sailboaters say, maybe he was not under power and only charging battery. BS. Motor running, is a power boat. Same as I heard a sailboater claim he had the right of way over a large tanker entering SF Bay. He will be both dead, and wrong. Technically, the engine needs to be engaged for it to be under power, but I agree with you. If I turn on my engine, even if it's in neutral, I consider myself a powerboat. I figure that the other guy is going to see the raw water coming out, and that might be enough to fool him. Why take a chance.... -- "j" ganz @@ www.sailnow.com You get in a crash and and the motor is running and claim you were not in gear, and are a sailboat, you are going to lose! As long as the motor is on, your are technically a power boat. You could reach over and put it in gear. Same as if just before the crash you pop it into neutral. Sorry, but although that is what YOU think makes sense, it is not the law. If an anchored powerboat is considered a powerboat when anchored, you think the court will let you get away claiming under sail status when the engine is running? Absolutely! In court, evidence is debated to arrive at a decision. If I can convince the court that my motor was running but not engaged, then that will be the finding. |
Reply |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
Capsize Prevention | General | |||
Crikey...an ounce of prevention... | General | |||
effective prevention and recovery of sinusitis | General | |||
Flying Pig Prevention Measures | Cruising | |||
Boat Crime Prevention Tips | General |