Flat Spins - RCCanada - Canada Radio Controlled Hobby Forum
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Old 07-22-2013, 08:40 PM   #1
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Flat Spins


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So I finally got up the nerve to venture outside of Sport flyin' a little bit. Have been working on flat spins. So here is the question, I can get it (30% S-Bach 342) into the spin (nice and tight) but the plane displays quite a bit of nose down attitude.

Whats wrong? CG to far forward, not enough elevator...
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Old 07-22-2013, 08:45 PM   #2
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Re: Flat Spins

Add some throttle that should help flatten it out
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Old 07-22-2013, 08:49 PM   #3
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Re: Flat Spins

Ah! I can give that a spin!
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Old 07-22-2013, 09:15 PM   #4
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Re: Flat Spins

I've seen guys talkin' about setting their planes up for "Neutral". How is this accomplished? Would I change the CG so that if I fly up at 45 degrees, then roll inverted I wouldn't have to add down elevator?
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Old 07-22-2013, 09:20 PM   #5
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Re: Flat Spins

Correct. Trimming can be a hobby in its own right search guys like Peter goldsmith. They have written essays on that part of the hobby
Good trim chart to start with
http://www.flyinggiants.com/forums/a...2&d=1218140174
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Old 07-22-2013, 09:28 PM   #6
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Re: Flat Spins

Thanks Hanes. This plane Sport Flies well. Knife-edge is a breeze both directions, Mr. Hunter hovered it with ease! Guess I'll tinker with her, she's way over her "Best Before" date!

So what other simple 3D techniques could a novice try? (Yeah Dale I gotta get off the farm more!)
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Old 07-22-2013, 09:57 PM   #7
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Re: Flat Spins

I balance my planes until they fly level when turning the airplane inverted at 1/2 throttle.
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Old 07-22-2013, 10:09 PM   #8
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Re: Flat Spins

Interesting! Wonder if anyone messes with engine thrust angles?
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Old 07-22-2013, 10:14 PM   #9
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Re: Flat Spins

I'm with the first guy inverted on a 45 and it maintains the 45 is where I like to be with my slick. The yak is tail heavy it climbs when I do the 45 lol. And I agree with the adding throttle in the flat spin it will hold the nose up and make for some nice tight spins
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Old 07-23-2013, 10:16 AM   #10
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Re: Flat Spins

I tend to fly my planes slightly in the nose heavy side. Just a bit than the "recommended"
CG. Mostly because I feel that planes that are right on the CG (with a few exceptions) or slightly tail heavy, doesn't track properly, doesn't lock the lines either and it becomes more evident in the snap rolls. They will hover and torque roll just fine too.

As for the up right or inverted flat spins, I have my plane setup (YAK54 40%) with 45 degrees of elevator and 45-48 degrees or rudder.
These two surfaces are pined throughout the maneuver and then there is a balance between opposite aileron and power management. It applies to both up right and inverted flat spins.

Too nose heavy airplanes don't fly properly, too tail heavy airplanes, only fly once.

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Last edited by VA6WGO; 07-23-2013 at 10:29 AM.
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