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HomeAircraftHelicopterAlignT-REX 600N › 600 LE when Piro, Head speed drops, bogs engine
02-05-2010 12:53 AM  8 years agoPost 1
KingJoeMack

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New Baltimore, Mi USA

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New Heli-Must be somewhere in my setup, mechanical or radio DX7
Changed motor, as I thought I had a bad ring in frist motor, Second motor- runs fine in other heli, but both motors bog and head speed drops.
I had 1 auto when I stalled the motor trying to figure it out. Running max pitch +12/-12 (can't get any more) and does not seem to be binding.
Any Ideas?

Fly with scheduled ground contact !

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02-05-2010 02:05 AM  8 years agoPost 2
Ladymagic

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South Korea

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You just need to adjust your Pitch and throttle curves. Sounds like your throttle might be set too low under your pitch. I always set my throttle curves a slight higher than the pitch to compenstate for the extra load on the head at higher pitch angles. I don't think you need expos. Straight curves should do just fine.

Normal mode: 0 @ low point , 55@ middle point, 90@ high point for throttle.
For pitch, try -2 degrees @ low stick, 0@ middle stick, and +9 to + 11 degrees at high stick.

Stunt modes should be 100@ low point, 50 at middle point, and 100@ high point for the throttle. For your stunt modes, all you need to do is adjust your middle point up from (50-80 for Nitros and 50-95 for e helis) depending on how much power your engine is giving you and your flying expectations.

Pitch should be -11 to -14 degrees at low stick, 0 @ mid stick, and +11 to +14 degrees @ high stick. Just make sure your max - and your max + value match. So, if you have -12 at low stick, then you should have +12 at high stick and 0 in the middle. If you get un equal values, take the difference between the two and divide that value in half. That will give your ideal pitch range to shoot for on both sides.

You probably already know all of this, but I'd check your program before you go and start blaming your engine. That fact that two different engines are doing the same thing suggests that the problem is in your head or your program curves. Of course, this is assuming that your engines are healthy and tuned properly.

Another thing you should check is to make sure your pitch is symetrical. Measure the distance between the top of the main bearing and the bottom of the yoke, divide that in half and set the top of the swash plate to the center point. Then adjust the swash links to match. Then, you just need to set the blade grips to 0 degrees by adjusting your pitch links. Center your servos and servo arms with your stick position at exactly center stick. The align head is a great head and adjusts easily. So, once you do this, you should get the same pitch on the + and - side of your pitch range with perfect 0 degrees in the middle. The default throttle and pitch curves should work well after you've done this. You can tweek it to feel just right from that point. This teqnique works well with any traditional style head assembly. Give it a shot and see if it helps you out any.

Mellisa

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02-05-2010 02:28 AM  8 years agoPost 3
KingJoeMack

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New Baltimore, Mi USA

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I will go thru it again. I am running a governer, at 2000 RPM head speed, and the condition is present in idle up with gov. on.
I will check pitch curves.
Thanks for the input.

Fly with scheduled ground contact !

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02-05-2010 02:42 AM  8 years agoPost 4
Ladymagic

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South Korea

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You are welcome
What headspeed are you running in Idle up mode? Your target rpm shouldn't be that high. Maybe around 1650-1750rpm. It won't hurt it to run a higher headspeed in Idle up, but it's not really necessary.

Mellisa

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02-05-2010 03:05 AM  8 years agoPost 5
KingJoeMack

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New Baltimore, Mi USA

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Sounds like about 2000, I will tach it tomorrow so I have a baseline to work from before I start changing things.
But thanks to you, I now have a plan of attack.

Fly with scheduled ground contact !

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02-06-2010 01:35 AM  8 years agoPost 6
djrformcar

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Las Vegas, Nevada USA

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You may also check the cyclic pitch range. If you have more then 9degs +- then that with the collective could be too much overall pitch. That was one of my problems, great collective but too much cyclic pitch.

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