dive vanes....

[u-33]

What are your thoughts on connecting front and rear dive vanes to the same servo? Just wondering which is the way to go here…

(a) front vanes up…rear vanes up and front vanes down, rear vanes down
or
(b) front vanes up…rear vanes down and front vanes down, rear vanes up


Rich

[JWLaRue]

How about:

c) front dive planes

How about:

c) front dive planes connected to servo, used to control depth and aft dive planes connected to a different servo and a different channel, which is in turn connected to a pitch controller used to control pitch.

-Jeff

[ricknelson]

Rich,

Weither or not you take

Rich,

Weither or not you take Jeff's suggestion, option (b) is the only one that can work. If you chose option (a) your controls (diving planes, stern planes) will be fighting each other.

[Guest]

How do you figure that

How do you figure that Rick?

Both vanes will be producing down thrust, the boat should dive and rise on the level with such a set-up.

[Wheelerdealer]

a) is dive and surface

a) is dive and surface with no change in pitch, and b is dive surface with a change in pitch.

a) is good for a ballasted down dynamic diver with little freeboard. b) is better if you have a lot of buoyancy/crash dive.

I've never had a dynamic diver with foreplanes so have never connected both planes together. Always done it the way Jeff suggested when I have working forward planes.

[ricknelson]

In theory and small submarines

In theory and small submarines (a) may work but on 1:1 boats we had to take eithor a 10 degree up or down angle opposite to the bow planes in order to make them more effective.

[JWLaRue]

How do you figure that

How do you figure that Rick?

Both vanes will be producing down thrust, the boat should dive and rise on the level with such a set-up.

I think it's because the action of the dive planes causes a pitch axis rotation around the center of gravity. Hence stern planes in the 'up' position cause the stern to rotate upwards around the c.g.

-Jeff

[u-33]

But wouldn't that help force

But wouldn't that help force the boat down quicker...pushing the nose down and the stern up would surely steepen the dive angle? Or am I barking at the wrong cat?

Rich

[Guest]

It will be more effective,

It will be more effective, but if you try that trick with a too much freeboard, the stern of the boat will lift out of the water and prop will thrash about in the air.

[ricknelson]

Another factor that needs to

Another factor that needs to be taken into consideration, especially with boomers and some degree fast-attacks, is that the hull aft of the fairwater acts as a lifting body. This comes into play at higher speeds. Again, I speak primairly for 1:1s.

[u-33]

To hell with the expense,

To hell with the expense, I'll buy another servo!!!

Rich

[Guest]

Good idea.

Good idea.

[u-33]

http://www.subcommittee.com/forum/icon_lol.gif

Rich



Rich