So the lower end of the outboard that the propellor is attached to creates drag with resists the forward movement of the boat. Or something like that is how they describe it.
So how can you decrease that drag and other issues.
Other issue first. What if you had a secondary cooling system to an outboard whereby a servo motor senses it the outboard just got to a certain too hot temperature and opens an intake port on the front of the lower unit to bring water directly into the cooling system? Perhaps that would just create more drag. But what if at the same time it exited out back hole? In doing so it sucked water from the upper of the outboard out. But where would the intake of that water be?
But back to drag. What if there was a way to pump air bubbles in front of the lower unit? Would that not reduce the drag? But then you would have not as high a thrust? Because you are just pushing air back and not water? No, not that much air? Perhaps there is a differential truth in there.
And I forget what I was going to say about cavitation. Other than the water immediately behind the stern has a different property because of the weight caused by gravity of the hull? In effect the "Gravity weight" if you will pardon the loose terminology creates a cavitation upper wall? Okay how can that dynamic be used to a new advantage or improved upon?
As the hull lifts out of the water, the boat goes faster, and the resistant caused by the hull lessens and thereby the boat goes faster, and over all the drag created by the lower unit in comparison to total drag including the hull,...whereby cavitation,,, the dynamic there changes, perhaps you have a suspended weight of the hull and the cyclonic action of the water behind the propeller,, well it is a different "state" at that point. The propellor closer to the surface. So how does that affect a measure of cavitation?
Just thinking or pondering rather, out loud here. I think that there are some factors that could be better utilized in design?
And did you ever ask yourself why designs change? It is because they didn't get it right the first time? If they got it right the first time the design would never change?
And some of this stuff is hard to understand when you read about it. More-so because they can't explain it clearly. And when it can't be explained clearly, you know that there will be new designs coming? How do you know that something isn't explained clearly? Because from the given information providing strong conclusions can't be made? Because there are certain questions that arise that are not answered in the explanation? And did you ever ask yourself this, why does that "Charlatans" response not answer the question? Then you ask yourself, what weakness is the Charlatan hiding? And you would be wise to ask that before you spend your money on something or give it to someone? And sometimes you have to go about it this way, "This person read 'this' and 'this' must be what their apparent understanding of what they read was? But what is missing there in what they are conveying?
Okay, that's it for me. I got dirty kitchen to clean up from making those tacos. Grease in the dam sink to clean up. Then I want to take a shower.
© 2023 Thomas Paul Murphy
No comments:
Post a Comment