Nose pitch's up

[nate428]

im wondering about your cg... if its hands off inverted that is usually pretty tail heavy. if you release the throttle and it pulls to canopy while slowing down that's cg. i don't think an upline and downline would show this.
the mix may fix it, my concern is that mix used in other situations... inverted, hovers, harriers etc...

[Oilsands]

	Quote: Originally Posted by nate428
	im wondering about your cg... if its hands off inverted that is usually pretty tail heavy. if you release the throttle and it pulls to canopy while slowing down that's cg. i don't think an upline and downline would show this. the mix may fix it, my concern is that mix used in other situations... inverted, hovers, harriers etc...

He did say that when inverted it is almost hands off, so he is maintaining level flight while inverted by addng a bit of down elevator (not sure how much cause it depends on your definition of a bit).
Maybe moving the cg forward a bit, which means a little more down elevator while inverted, may correct the original problem. Something to try out and then recheck all the trims. I am a little worried about the throttle - elevator mix, even though it corrects the problem. It may cause some other flight issues and it may not.

[RollingHarrier]

	Quote: Originally Posted by rc4flying
	You may have too much down thrust on the engine

What Papa Stek said. It's better the mechanically correct your plane instead of adding mixes.

[Edgeman 540]

I think I will agree that its a CG issue and that it may be a touch too tail heavy.
I removed the mix.

[Chris Puckett]

Almost every large Edge I have flown have this tendency. 33%-52%. A little down elevator mixed with extreme low throttle typically cure the problem but the rearward CG exaggerates the issue.

[Edgeman 540]

I'll try it again tomorrow.The wind is too strong to get an accurate reading right now.

[Oilsands]

	Quote: Originally Posted by RollingHarrier
	What Papa Stek said. It's better the mechanically correct your plane instead of adding mixes.

I agree on mechanically correcting your plane as much as possible before doing so with the Tx.
Let us know on what happens when you try moving the cg around.

[NormS]

I'm not an aeronautical engineer but here's my $0.02: In post 3 you said that it pitches towards the canopy a little in a vertical upline, which would normally mean that you need a little bit more downthrust, not less. If it balloons in level flight when you chop the throttle I would check the wing and stab incidence angles.

[Edgeman 540]

	Quote: Originally Posted by NormS
	I'm not an aeronautical engineer but here's my $0.02: In post 3 you said that it pitches towards the canopy a little in a vertical upline, which would normally mean that you need a little bit more downthrust, not less. If it balloons in level flight when you chop the throttle I would check the wing and stab incidence angles.

Thanks Norm I'll check that before going to the field tomorrow.
For some strange reason I see a 3D Hobbyshop AJ Slick 540 in the near future.

[Tired Old Man]

If it pitches with throttle changes it's thrust line. Throw all the mixes and c/g changes you want at it but the engine thrust line will still be impacting the flight. That's whay so many of you IMAC flyers have all that right thrust, correct? BTW, I have a 35% Edge and it does not change AOA one iota with throttle changes.

[Edgeman 540]

	Quote: Originally Posted by Tired Old Man
	If it pitches with throttle changes it's thrust line. Throw all the mixes and c/g changes you want at it but the engine thrust line will still be impacting the flight. That's whay so many of you IMAC flyers have all that right thrust, correct? BTW, I have a 35% Edge and it does not change AOA one iota with throttle changes.

Old Man does it sound like it has too much up thrust?

[astrohog]

I am certainly no guru here, but I own and fly both the 30% and the 36% Edge's and neither one of them have ever had this issue. Neither of my Edge's have any right, up or down thrust added in nor was it ever suggested in any of the build manuals. I have recently added a little rudder-to-throttle mix on my 30% er as it does want to pull left on uplines.

I would suggest double-checking how your motor is mounted and make sure it is done per the PAU manual (perhaps adding a little right thrust if you prefer). Also, double-check that your CG is within the PAU recommended range. Both of my planes do all the 3D maneuvers well ( I only know this as the club "pro's" have done em all with my planes ) and they are set up bone-stock per the PAU instructions.

As far as the torque roll issue: I am not very good at torque rolls, but I do know that when I get either of my PAU Edge's locked-in to a hover, it is near impossible to STOP the torque roll!!

Again, the best advice I can give is to re-check the CG, thrust line, incidences up/down thrust and right/left thrust and make sure they are all per the build manual.

I can imagine how frustrated you must be! Keep us posted as to your findings. I hope you get your issues sorted out so you can enjoy your Edge as much as I do mine!!

Regards,

Astrohog

[Edgeman 540]

Thanks Astrohog.

[Tired Old Man]

If a plane pitches up when you back off the throttle you have too much down thrust.

[JoeAirPort]

That's what I'm thinking too. I had this plane for three years. It didn't do this. If it's really tail heavy it might baloon on landing but it won't pitch up when you chop the throttle. If it pitches up when you chop throttle add more up thrust. That's how I remember it. The reason is that because the engine is pulling it down when it's rev'ing, and the elevator trim is pulling up to compensate, and keep it straight and level. When you chop the throttle and lose the engine thrust pulling it down, the elevator trim pulls it up.