102" issues....

[mikejr718]

Hey I am probably going to call qq aircraft tomorrow but thought I would run this through the support forum first.

I have a Gen III Yak 54 100cc, With a Da 100 (stock pipes) JR 8611A servos on everything but Rudder (1x JR 8711). I am Using a 9303 2.4 Trans with a Spektrum 9100 reciever + 2x A123 batteries. I have a Kevlar pull pull and aside from that the plane is 100% stock. CG is at the stock location, I have checked elevator incidence to +.5 degree on each side. The control throws and exponential are setup as labeled in the instructions.

The issue I am having is my plane always carries up elevator trim unconditionally. That seemes to be normal on Qui Que's 102" Yak 54 though. The other problem I am having is when in inverted harriers the plane is very squirlly and always wants to drop a wing and almost fall out of the sky. But in low rolling manuvers it has a tendancy to lose a lot of altitude fast even with huge control inputs (High Rates). The plane has a very loose and uncontrolled feeling in almost all high alpha manuvers.

I have adjusted the cg back adding 1 oz at a time, I have added a total of 6oz of weight and the symptoms change very mildly not exactly better or worse. I have owned 3 QQ yaks now and this one seems to be the dud of them all ( 1x 50cc Yak and 1x gen II 100cc Yak). I am lost with this plane, I am not sure what to do from here on out to get it flying like either of my other yaks.


Thanks for your time, Trey O'Daniel.

[3D-Seth]

	Quote:
	The issue I am having is my plane always carries up elevator trim unconditionally.

What exactly do you mean?

	Quote:
	The other problem I am having is when in inverted harriers the plane is very squirlly and always wants to drop a wing and almost fall out of the sky.

Mine was (Gen 1) / is (Gen 3) not this way at all . . . check your lateral CG as well as up/down right/left thrust.

Heres a video that has mine in an inverted harrier . . . not sure what your problem is exactly, but mine is very stable in inverted harriers as well as harrier rolls.

YouTube - Hamilton Hawks IMAC Freestyle - Seth...

Seth

[mikejr718]

Ok sorry I didn't mention this but I have laterally balanced the plane 2 or 3 times, I have 1/2 oz on the right wing as of now. I have to still check thrust angles I will do this tonite with my Hangar 9 Angle pro.

Thanks for your time.

[Reza]

Trey,

What you are describing seems like you are not carrying enough throttle. Inverted harrier is a relatively easy maneuver but at the same time plane is extremely sensitive to aileron input! While you are feeding the elevator, you may be moving your ailerons to an undesired direction! At the same time, I feel you let go of throttle too low in your maneuvers. There is absolutely no reason to add 6 oz of weight to the tail if your CG is set at 8 ½” from trailing edge. If you do so plane will not fly right!

Your incidence is correct as well. The maneuvers you are referring too are very sensitive to throttle and deflection with no throttle doesn’t do much! I feel you need to work on the coordination of these with your speed. It’s really easy to get the plane go to a spin or drop a wing in inverted harrier with one or two small mistake. Same in rolling maneuvers!

You are more than welcome to call the company. I can’t really give you much help here. I don’t see anything that ring a bell to me on the plane.

That couple of click of up trim is normal on all QQ designed Yak-54.

Thank you,
Reza

	Quote: Originally Posted by mikejr718
	Hey I am probably going to call qq aircraft tomorrow but thought I would run this through the support forum first. I have a Gen III Yak 54 100cc, With a Da 100 (stock pipes) JR 8611A servos on everything but Rudder (1x JR 8711). I am Using a 9303 2.4 Trans with a Spektrum 9100 reciever + 2x A123 batteries. I have a Kevlar pull pull and aside from that the plane is 100% stock. CG is at the stock location, I have checked elevator incidence to +.5 degree on each side. The control throws and exponential are setup as labeled in the instructions. The issue I am having is my plane always carries up elevator trim unconditionally. That seemes to be normal on Qui Que's 102" Yak 54 though. The other problem I am having is when in inverted harriers the plane is very squirlly and always wants to drop a wing and almost fall out of the sky. But in low rolling manuvers it has a tendancy to lose a lot of altitude fast even with huge control inputs (High Rates). The plane has a very loose and uncontrolled feeling in almost all high alpha manuvers. I have adjusted the cg back adding 1 oz at a time, I have added a total of 6oz of weight and the symptoms change very mildly not exactly better or worse. I have owned 3 QQ yaks now and this one seems to be the dud of them all ( 1x 50cc Yak and 1x gen II 100cc Yak). I am lost with this plane, I am not sure what to do from here on out to get it flying like either of my other yaks. Thanks for your time, Trey O'Daniel.

[mikejr718]

Is the stock Cg fairly conservative?

[cyco]

stock cgs are always "save".

i like 3D cgs when the plane is going like a shocky,- that means in most times a very big amount of weight on the tail -but not evrybody can fly with this...

on my 86 YAk it was weight a little bit infront of the normal cg for pattern, for 3D i added about 350gramms on the tail....

on my 3.1m XXL Raven there need to be about 450-500gramms on the tail for the 3D cg i preffer.

But that are very extreme Cgs , with those the best tricks can be flown, but you need to be very carefull, too.

Regards,Chris

[Reza]

It actually is not! It is the correct CG for the plane. Quique and I both fly at 8 1/2". 6 oz to tail over that CG is a big difference!

	Quote: Originally Posted by mikejr718
	Is the stock Cg fairly conservative?