RCU Forums - View Single Post - Exponential on Elevator?? Is it required on a Bandit.
Old 02-20-2012 | 05:11 AM
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John Redman
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From: Lancaster, CA IL
Default RE: Exponential on Elevator?? Is it required on a Bandit.

Hey Roger,

I would look hard at the CG and stab incidence. I am pretty confident you have the stab incidence per the plans. The elevator should have a small amount of up elevator trim for flight when in the flaps up flight mode. About 1/16" at the tip. If you have more than that, adjust the stab incidence.

Pull the CG back a bit, we used to run in the 9 - 9 1/4" back on the old Bandits and Super Bandit's. At this point landings became a breeze. You should be able to settle the Bandit on the runway with a slight nose high position with about 1/3 - 1/2 the elevator travel. Travel on the elevator was around 22 degrees up and 24 degrees down. The factory CG on the old Super Bandit was a bit forward in most of our eyes back in the days.

I believe BVM has updated the web page to reflect this but the old plans showed an 8-1/2" CG or somewhere around there.

Also a number of us pattern guys alwyas flew with around 15 - 25% expo on the elevators, dependant on where we found the CG to end up.