RCU Forums - View Single Post - Black Magic VF3 Build Thread

06-16-2009 | 08:04 AM

#1218

rcpattern

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From: Great Mills, MD

RE: Black Magic VF3 Build Thread

Bill,

Throws are kind of irrelevent as everyone has their own tastes. You can pretty much look at what you like on other planes and go from there. Here are the important numbers.

CG - At the front of, if not just in front of the wing tube
Wing Incidence - .5 degrees positive
Stab Incidence - 0

If you match those the plane will trim INCREDIBLY easy off the bench. You should end up with 0 mix with right rudder and maybe 1-3% mix with left rudder. You will need about 1% mix with down elevator trim. If you accept those numbers you wont be happier. It is when you try to play too much to get rid of that last little bit that causes problems with this plane. You can probably fly it with zero mixes and not notice much of a difference, except the downlines, but on a dead calm day if you really look, you'll end up with just a little bit with left rudder.

For snap setup, lots of aileron and about 70% rudder with a little elevator thrown in for good measure. Chip Hyde and I spent a lot of time last week really dialing in the snap rates and it does a wicked snap now, even at the top of the 1 1/2 avalanche in masters and that thing is a BI^&H.

I dug through some notes and found these numbers which will get you pretty close. I haven't measured the deflections since Chip and I played last weekend. I'll work on that this week.

Aileron

Up 15 degrees

Dn 15 degrees

Elevator

Up 13 degrees

Down 13 degrees


Rudder
All you can get for stall turns. Adjust for snaps.

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