RCU Forums - Flat spin

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Hi,

I'm trying to perform a flat spin but the model does not sit flat.

Any suggestions on how to get it flatter?

Thanks

Brian

http://www.flyingcirkus.com/default.asp go here!!! but you probly just need to add more throttle if you have it in a good position to start with. inverted is a little easier for me. these people have a instructional video for a flat spin. what are you flying?

u should go into a blender then let go of the ailerons and being crossing them to the other side slowly while u add power. An aft CG is really important here. What plane/ engine do you have?

I go straight up and if I want it inverted I will give right rudder,kill throttle and hammerhead down releasing rudder and give left aileron let it spin a couple of times then move the right stick to the left corner and give right rudder at the sametime. while slowly adding a little throttle ( not too much just enough to keep it spinning) when i add the throttle I slowly take away some aileron (moving it twards center) untill it becomes flat (all of my models become flat in a different area on the aileron removal. some have to go a little bit opposite aileron) keep the elevator full down rudder full right.. You can keep it in the spin if it is a plane that will not lock by transitioning between power and aileron removal or opposite addition... most planes will lock in the spin when it becomes flat..... also watch out I have had some planes that will lock so hard that the only way to get out is with throttle... I dead sticked one such plane in a flat spin. A Sig Smith miniplane. It never came out because i didnt have any power to get the air back accross the control surfaces. It flat spinned all the way to the ground destroying the plane... 3D planes have more control authority. I havent found one yet that would lock like that..

:)I call this "The inverted flat spin landing" They are fun and look cool. But you only do them once per plane.
Thanks,
Barry

Each plane is different, my flip 3d flat spins without any aileron input for instance. Just need to experiment, if it looks like it's not flat and you have full elevator in, add throttle slowly till it looks flat etc etc.

Some airplanes flat spin inverted better because there is more air flow over the fin and rudder or less disturbed air. Think about it... when in an upright spin the air flow to the upright fin is blocked by the shadow of the wing as it is pancaking in. That is why some planes need a burst of power or put into a dive to get them out of a flat spin. Same goes for Harriers... some say thier plane will not wing rock in inverted Harriers because there is little disturbed air to the rudder inverted. I have a little .15 plane I designed that would flat spin like a frisby but it took nearly full power to get it back or a quick hit of power and down elevator when it was in an upright spin. Inverted it did not have this tendancy... probably needs more rudder area. I had an RC Nobler back in the 70's that did the prettiest flat spins because of the short coupling but it didnt have enough rudder area to recover easily and I pancaked that plane in three times and did very little damage cause it went in so slow.
Once I get into a regular spin I add power and start feeding in opposite aileron till it gets flat enough.

Smooth Flying...

Wayne G.

Hi thanks for the replys.

I am trying with both a Limbo Dancer and a Flip 3D. The flip maintains its attitude but isn't flat, the Limbo Dancer simply refusees to stay in it for ore than a couple of rotations. I am using nearly full throttle with both. Any suggestions on a good cog for both? I suspect mine are both too far forward coming from a pattern style of flying.

Generally, enter your normal spin. Add thorttle and give less of whatever alieron you have given. The right amounts vary from plane to plane but you'll find it ;)

Brian, with a limbo, try to do it inverted, there happier that way up.

the 3D rc web site is awesome..enjoyed watching nathan do his thing..I cant wait to fly this spring..yeah I am stuck in a very cold place but I can do electric outside my backyard so 3D yipppee

build you a glass sunroom and toss the electric out the door. stand inside and enjoy:D

Quote:

ORIGINAL: Vic3D

u should go into a blender then let go of the ailerons and being crossing them to the other side slowly while u add power. An aft CG is really important here. What plane/ engine do you have?

thanks vic your advice on the blender worked perfect and it works every time!!!