Re: Light-Sport Aircraft Yahoo group Re: Spoilers versus ailerons

Full span was out from the get go.  Just a waste of tubing and weight.  Spoilerons are simple and light.  That was the main reason Dick went with them.  I try any ideas off of him as they come up.  Adverse yaw can be reduced a lot with differential ailerons which is what I will use.  Dicks guidance reccomends using 6" spoileron plates instead of the original 4".  I am going to use the wider plates.  I also have a stock TX so I can see the effects of both sizes on the planes.  I am not the owner of Starflight aircraft but am the owner of the Starflight yahoo group.  I get asked questions quite a bit.  I just need to learn more to give better answers.  Roger P

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From: barnabywalker <barnabywalker@yahoo.com>
To: Sport_Aircraft@yahoogroups.com
Sent: Tue, December 21, 2010 1:03:10 AM
Subject: Light-Sport Aircraft Yahoo group Re: Spoilers versus ailerons

 

When building your ailerons, make sure to not make them longer than 1/3 of each wing. This greatly reduces adverse yaw as the center 2/3 which would normally contain flaps, should be avoided or the inboard sections of ailerons at a short moment arm would cause drag, hence the adverse yaw. Lightens stick load tremendously from those who copy tail-sliding tractor-propped aerobatic planes with "full-span" ailerons that sound good to marketing-types, but perform poorly with a pusher,because of the tremendous adverse-yaw and heavy stick loads.

I wouldn't bother with spoilers as they provide so little bang for the buck, providing only lowering and not raising the opposite wing. Your Flightstar probably flies quite well now with Rudder only,as Dick Turner designed it much like the Quicksilver and has lowered the dihedral greatly from the original. 1/3 length ailerons with sufficient throw should make it a quite nice handling plane.

Like I said, I would stick to dual-control 1/3 length ailerons and no spoilers,simply teach all students to fly with their feet, as Rudder is such dominant control with these type of craft and once checked out in your plane will have no problem with a spoiler plane.

Barnaby

--- In Sport_Aircraft@yahoogroups.com, Roger Poyner <rogpoyn@...> wrote:
>
> This post relates to airplanes and I hope it doesn't put me on moderated status
> for clouding up the site.   For years I have been hearing the merits of ailerons
> over spoilers for roll control on light planes.  I think I may try to settle or
> spur this debate on again.  I am going through my Starflight DBL on an extensive
> check out.  One of those that takes a look at every nut and bolt on the plane. 
> The plane was originally built with spoilers for roll control to avoid adverse
> yaw that can be induced with ailerons.  I started to build a set of ailerons to
> add to the plane because that is what I am used to flying GA planes.  I started
> flying in Weedhoppers in the mid 80s with two axis control and have flown the
> DBL in a two axis configuration and was impressed with how well it handled.
>
> Since I will replace the wing sails at any rate and add the dual controls for
> the ailerons my idea is to install both ailerons and spoilers on the plane.  The
> plane is a tandem two place and the front seat will have two control systems
> installed that are separate from each other in the front seat.  While both will
> share elevator control they will be on there own for roll.  Center stick for
> aileron roll and right side stick for spoiler control.  Production models of
> Starflights still use spoilers so the plane should work fine as a trainer for
> either system.  Intial test flights will be solo of course and the redundant
> flight controls can be tested one at a time.  The spoilers with the side stick
> and ailerons with the center control stick.  Dual control sticks will only be in
> the front cockpit with a center stick in the rear.  For spoiler training the
> center stick will be removed. 
>
> I just want to get a feel for both control systems and understand the merits of
> each.  Any one have any thoughts?  Roger P
>

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