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Home✈️Aircraft🚁Helicoptere-AlignOther › TRex 450 blade pitch question
02-11-2008 02:19 AM  11 years ago
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Nicros

rrApprentice

San Diego, CA

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TRex 450 blade pitch question
Hi,

I noticed that when I set up my TRex with all the manual recommended linkage lengths that the pitch is kinda whacked. At 50% throttle everything is zero- thats good.

But at 0%, the pitch is like -14 degrees, and at 100% I get about +6 degrees. I can fly and all, but its sure not the -10,0,+10 recommended.

Is there some linkage I should adjust to get this correct? Or something in my DX7 I should set up? Can someone shed some light?

Also, for the 3 throttle curves norm, st1, and st2 what should the 3 pitch curves look like? I read somewhere that norm=-3, 0, +10. Is that right? What about st1 and 2?

Watched all the finless stuff but didnt see this one.

Thanks!
Ever notice how crash rhymes with cash?
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02-11-2008 07:23 AM  11 years ago
Sam2b

rrElite Veteran

Tacoma, WA

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I would suggest removing your linkage rods and make sure you have the correct lengths installed on the right sections.

If you make all linkages rods (servo/swash and head linkages) the tracking should be very close to perfect, and collective should be the same +-. If you were off kilter a little bit, I'd give alternate instructions, but +6 and -14 is very much off kilter.

If you must, remove the plastic ball links from metal rods and carefully measure them and match them all up according to the manual. It is worth the time.
_Sam B_
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02-11-2008 07:51 AM  11 years ago
Sam2b

rrElite Veteran

Tacoma, WA

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Before you measure your blade pitches, first tighten the blade grips fairly firm on the blades, and spin the heli up about 1000RPM and let it come to a stop on its own. This will allow centrifugal force to extend both blades 180 degrees from each other.

CAREFULLY pick up the heli being sure not to bump the blades, and bring it to the work bench. Carefully put the pitch gauge on and measure again.

If your blade is not perfectly 180 degrees from the main shaft within the blade grip you'll have different pitch measurements.

Otherwise, last resort, the only thing to do (in your case of +6 and -14) is lengthen your three swash linkages by two turns, and lengthen your two mixer arm linkages by two turns. Then you will have shorten your two blade grip linkages to get it back to zero degrees. Then finally measure full negative and positive collective.
_Sam B_
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