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Cowl flaps ?

Old 01-26-2002, 12:37 AM
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Default Cowl flaps ?

how would you make working cowl flaps on a plane that is quite large ?
Old 01-26-2002, 12:55 AM
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Default Cowl flaps ?

There are a number of ways including a circular tensioning wire that is servo pulled. It really depends on the cowl shape and size, and the location of the cooling flaps. Wide spacing between flaps is tough. Continuous flaps like a can be easier. What plane are you trying to do this on?
Mike
Old 01-26-2002, 01:01 AM
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Default Cowl flaps ?

Either the JU-87 stuka B-25 Mitchell or the F4U corsair, both are Nick Ziroli plans, i wanted to know if i could do it first so i could decide, on which to choose.
Old 01-26-2002, 05:08 AM
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Default Cowl flaps ?

I haven't built a Stuka. The Ziroli B25 is do able either by using small rod actuators, small air rams, or a wire going through guides that when pushed by a servo force raises the gils. The gils obviously have to be hinged. The same can be done on the Ziroli Corsair. This involves a small brass tube on the inside of each gil with a wire running in a circle through all of them. The wire ends go to opposing sides of the servo arm allowing you to force open or pull closed.
I have also seen some one use very mild spring loading, when the plane reach a reasonable air speed, the air pressure forces the gils to close.
Mike
Old 01-26-2002, 05:22 AM
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Default Cowl flaps ?

Hook up to your throttle servo, faster closes, slower opens.
Old 01-27-2002, 01:20 AM
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Default Cowl flaps ?

Bruce,
I would be careful hooking any extras to a throttle servo. If something jams you have a problem.
Mike
Old 01-27-2002, 02:36 AM
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Default Cowl flaps ?

Use a "Y" and a small servo.

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