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Old 07-18-2005 | 01:40 PM
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AcroJo
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From: Clarks Summit, PA
Default RE: U Can Do 3D

Unfortunately there are no magic numbers with everything being relevant and all models not being equal. Close but not exact. This is how I would approach it, the longest, most tedious route.

#1- build and balance, not forgetting laterally.
#2- set up all control surfaces as mechanically neutral or equal as possible.
#3- take the plane up high and then point it down without throttle. If set up correctly the plane should come straight down. Considering the counter balance on the elevator and rudder, your chances of getting them even are very good, so we move on to the ailerons. If when coming down the plane favors the canopy or looks like it is going to pull out, the ailerons are too low in comparison to the incidence of the wing. Raise the aileron attitude. If on the way down it goes to the wheels, the ailerons are too high. You must make equal adjustments up or down on both sides until the plane comes straight down. Doing so a little at a time.
#4- fly the plane inverted and upright to determine the proper CG. When done correctly it should fly hands free in either attitude. This is not to determine the CG for 3D or anything else. Its the true CG of the plane relevant to your set up and weight distribution.
#5- now that the plane is set up as neutral as possible, from straight and level, add full power into an up line without any other control input. With the top of the plane facing you, watch where it goes. The rest is simple, but time consuming, as it is trial and error. If the plane goes to the left you need right thrust and vice versa. Once sorted out, pull another up line, this time looking at the side of the plane, if it favors the wheels or falls forward in a climb, you need up thrust and again, vice versa if it pulls to the canopy.
#6- with all this done, you should be able to go from level flight, at the slower end of cruising speed to full throttle without the plane pulling up, down, left or right.
Very time consuming, yet completely rewarding if done right. You will see the difference in a plane of any type that is set up properly. This is just the way that I go about it. Good luck, Joe