push vs pull vis a vis rudders
you can't see it, you can't measure it, you can't detect that it is there at
all, but it still exists? How is that? You can measure it. You can detect if it's there or not. All you need are stress sensors on the rudder post to measure what the rudder is doing. how about the "stress sensors" you have on the steering wheel or tiller. What are *they* telling you? |
push vs pull vis a vis rudders
The same thing can be said for the engine in forward. I.e.,
you can't predict which way the boat will turn when you turn the rudder one way or another maybe *you* can't predict which way the boat will turn but the rest of the boating population can. |
push vs pull vis a vis rudders
schlackoff, don't drink so much before you post. tomorrow you read your post
below and you are going to one embarrassed dude. you can create a thrust vector by diverting non-unidirectional flow as long as the the sum of the non-unidirectional flow is not 0, which it is not for the case we are talking about because if it was, the boat would not move backwards when the engine is put in reverse. you tipped a bit more and wrote this: You're probably thinking of an absolute vacuum. In that case, a "vacuum in air" is an oxymoron also. But since you mentioned a vacuum in air, here we must talking about a relative vacuum which is simply an area where the pressure is lower than another area. That is easily created in water. you tipped even more and wrote this embarrassing drivel Actually, the liquid volume can change when the pressure changes. However, it's a minute amount only measurable for drastic pressure changes. But that's outside the scope of this thread, where we can treat the liquid volume as constant when the pressure changes. onward you went with this: That depends on how much you reduce the pressure. Is it your contention that anytime you reduce the pressure of a liquid by any amount that you must have cavitation? If so, you are plainly wrong. you wrote the following which makes no sense at all. You think wrong ... if we're talking about a relative vacuum and not an absolute vacuum, which is obvious we are from your previous statement: "so you can't create a vacuum in water like you do in air." A vacuum in air is also an oxymoron unless you're *not* talking about an absolute vacuum. more confusiong with: But it does flow from higher pressure areas to lower pressure areas. The lower pressure areas are the vacuum in this case, just like air. And it does not have to cavitate in the areas under lower pressure. huh?? Sure they do. The area in front of the prop blade is at a lower pressure than the area behind the prop. i.e., one definition of a vacuum. You can measure a vacuum in water yourself if you want. Just put a vacuum gauge behind a water pump and you will measure the vacuum of the pump sucking water through it. I have several of them on my boat for measuring the condition of fuel filters. Steve |
push vs pull vis a vis rudders
|
push vs pull vis a vis rudders
|
push vs pull vis a vis rudders
Jox, adults are having a conversation. Come back when you have
something of value to post. Steve |
push vs pull vis a vis rudders
yuk yuk. schaloff make a funny.
Jox, adults are having a conversation. Come back when you have something of value to post. Steve |
push vs pull vis a vis rudders
you can't see it, you can't feel it, you can't measure it, but ...
they may not be telling you is the small amount lateral force generated by a prop in reverse. sure, schlackoff. sure. |
push vs pull vis a vis rudders
yeah, sure. rudder right, tranny forward, throttle forward and what happens
.....??? The same thing can be said for the engine in forward. I.e., you can't predict which way the boat will turn when you turn the rudder one way or another maybe *you* can't predict which way the boat will turn but the rest of the boating population can. Uh huh. Well, you must not be very experienced if you've never had your boat turn in the opposite direction from where you had the rudder. Stop playing in the bathtub and get some real experience. Steve |
push vs pull vis a vis rudders
|
All times are GMT +1. The time now is 01:23 AM. |
Powered by vBulletin® Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Copyright ©2004 - 2014 BoatBanter.com