Extreme Speed Prop Planes Discuss the need for speed with fast prop planes (Screamin Demon, Diamond Dust, Shrikes or any REAL sound breakin'''' plane)

trimming a delta?


Old 05-05-2007, 09:40 PM
green river rc
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Default trimming a delta?

I have delta wing plane that has a bit of cork screw during a fast roll. In other words, the nose is not perfectly straight with the roll axis. Do I need to adjust the CG or maybe other issues?
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Old 05-06-2007, 08:24 AM
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Default RE: trimming a delta?

if you are nose heavy and added up trim to correct then you will see a slight corkscrew.
so check your CG and correct if needed.

add expo to your elevator...so when you roll and lean on the elevator movement is will be less.
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Old 05-07-2007, 08:29 AM
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Default RE: trimming a delta?

corkscrew is corrected by aileron differential.

check for this....

fly level flight away from you, pull up 45 deg, do a half roll to the right.

If the plane tracks straight --- no correction required

If the plane pulls off to the right, this means you have too much down aileron travel compaired to up.
You can correct this with most computer radios (try something about 100% up and 80% down travel).
The mix should not affect the elevator component of the controls.
Use the linkage at the servo wheel/arm to create the differential.\
Assuming servos mounted on top of a wing (pull for up aileron)
You want the neutral servo, with the arm trailed slightly aft toward the aileron (try one spline, or one hole aft on the output wheel first)
This creates control throw with more up than down travel.

If the plane pulls to the left after your 1/2 half roll to the right....
you have too much up aileron travel, and the opposite correction is required.

This is an often over-looked trim aspect.

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