[NSRCA-discussion] Air Breaks

[Mike Darr]

Bill,

I have been using what you call air brakes for years on my pattern planes. 
You will program both ailerons to go up.  When you do this the nose will 
pitch up, so you will need to program a little down elevator in the mix.  I 
generally program 11 degrees of up ailerons and 1 to 2 degrees of down 
elevator.  You will need to experiment with the correct amount of down 
elevator that is needed for your airframe.  This set up will slow the plane 
down, and help prevent bouncing during your landings, especially with fixed 
gear.  It will also help make your landings more predictable.

Now you may think that you will need up elevator while deploying spoilerons, 
because you are decreasing lift on the wing.  The wing lift does decrease, 
but the trailing edge of the wing quits flying before the leading edge does. 
This causes the nose to pitch up, and requiring down elevator to maintain 
level flight.  The down elevator increases lift on the stab, causing the 
tail to lift and maintain level flight.

Hope this helps,

Mike Darr






----- Original Message ----- 
From: "Bill Markovitz" <wdmarko at yahoo.com>
To: <nsrca-discussion at lists.nsrca.org>
Sent: Saturday, May 13, 2006 10:00 AM
Subject: [NSRCA-discussion] Air Breaks


> I'm interested in using the air brake function for
> slower and more controlled landings.  Any suggestions
> for a starting point on the aileron and elevator
> throws would be appreciated.  Is it better to have the
> ailerons up and the elevator down or the ailerons down
> and the elevator up?
>
> Thanks, Bill :)
>
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