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All flying vs Flapped control surfaces

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All flying vs Flapped control surfaces

Postby redboat219 » Mon Oct 06, 2008 5:58 am

Are there any pros or cons between using control surfaces with separate flaps compared to those with an all-flying set-up?
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Postby aquadeep » Mon Oct 06, 2008 8:18 am

All flying will give better responce,at least double the turning force is achieved and is highly recomended especialy on large subs.

The difference is fenominal with just a small change in the lower rudder as I modified my 5 ft Alfa, nearly 50 % tighter turrning radius without having to do the same mod to the upper rudder.

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Postby Wheelerdealer » Mon Oct 06, 2008 10:34 am

I dont think there much differance between the two assuming the the bit that turns is the same size/area. The size of the rudder is what has the greated bearing on the turning circle rather than the design. The stationary part in the flap rudder also helps reduce torque roll.
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Postby RickNelson » Mon Oct 06, 2008 7:27 pm

Excuse my ignorance but would someone please define what "all-flying" and "separate flaps" set ups are.

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Postby Crazy Ivan » Mon Oct 06, 2008 7:49 pm

Rick,

I'll hazard a guess that an "all-flying" control surface is one in which the entire structure rotates, as is typical of the rudders on an American nuke. "Separate flaps" would refer to things like the stern dive planes on most nukes, where the forward part is fixed, and only the after section moves. This is also seen on the rudders of Akula's and most other Russian nukes. Is this what you're referring to redboat219? Or do you mean the split control surfaces some of the newer boats use, where a small section moves independently for fine trimming?
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Postby redboat219 » Mon Oct 06, 2008 11:02 pm

Ivan.
I was referring to the first one wherein the stern dive planes either move as a whole ( hence all-flying) compared to the traditional dive planes with a fixed forward section and movable control surfaces in the rear.
Do they have any dis/advantage over the other?
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Postby Wayne Frey » Tue Oct 07, 2008 2:24 pm

The Russians use the setup they do for "ice ops". Stronger for breaking through the ice is an advantage.
A lot of their work is in a colder part of the world.
Even the ports freeze up before they even leave.
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Postby RickNelson » Tue Oct 07, 2008 3:10 pm

Thank you, Ivan.
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Postby TMSmalley » Tue Oct 07, 2008 6:27 pm

I put full flying rudders on my 1/72 Alfa and it made a big difference in the turning radius. Not scale but made it easier to run in small venues.
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Postby redboat219 » Wed Oct 08, 2008 1:14 am

What about the dive planes?
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Postby aquadeep » Wed Oct 08, 2008 11:43 am

Same result ,faster responce and beter control but not scale like,so what I would do is compromise ,dont make them too much bigger.Maybe just longer.
If you make them like ailerons the sub will bank and turn even sharper but you will need 2 servos and a computer radio,its easy and hole lot of fun!
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