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Align
Other › did a flip heard a crack then CRASH!
11-20-2006 07:36 PM  11 years agoPost 1
Rennster

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Hawaii

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First time I experienced this. I was in the middle of a flip, the heli was inverted, heard a sharp crack like lightning and the heli came down in pieces. I saw my antenna wrapped around the main shaft, tail boom looked like a blade struck it and of course one blade disintegrated.
Boom strike in mid air?
Broke the two lower sideframes, boom bent, blades , probably main shaft and feathering....etc.
Man this is frustrating, I had just fixed the damn thing yesterday.

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11-20-2006 07:41 PM  11 years agoPost 2
caseyjholmes

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Portland, Oregon

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Hit your horizontal fin. Cut them shorter from now on to prevent striking.. 325 pro woodies? Sorry to hear about the crash dude Done that one before too. Also check on your dampeneing.

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11-20-2006 07:46 PM  11 years agoPost 3
Rennster

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Hawaii

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I was flying without a horizontal fin. COuld it be the dampening was too soft? Do I need to tighten up the blade grips to the feathering shaft? I noticed these past few times that I fixed the heli, flips tend to lean to the left when it is inverted and rolls seem to be yawing to the tail when I roll it. I am frustrated with this thing. Swash is setup level. I did increase the ATV for one servo to make the swash level at max pitch travel.

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11-20-2006 07:51 PM  11 years agoPost 4
caseyjholmes

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Portland, Oregon

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If you do a flip and hold full ele stick, how fast does it flip? Where was the boom struck? (was it the flybar?)

If it flips TOO FAST, the flybar paddle might have hit the boom if it flexed.. But that would be a crazy fast roll rate.. and you should tone it down anyways.

Any broken servos??
Using longer flybar?? (220mm)

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11-20-2006 07:59 PM  11 years agoPost 5
caseyjholmes

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Portland, Oregon

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I noticed these past few times that I fixed the heli, flips tend to lean to the left when it is inverted and rolls seem to be yawing to the tail when I roll it
Sounds like you might even be binding the swashplate against the shaft colar at full negative pitch and cyclic travel? OR maybe too much pitch?

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11-20-2006 08:18 PM  11 years agoPost 6
Rennster

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Hawaii

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Thanks for the insight Casey. The boom looks like it was struck by a blade as the dent is far towards the tail.
I did increase the negative pitch last night with my radio to be at -10 degrees of pitch and my elevator cyclic D/R is at 120% for max cyclic.
The heli does seem really twitchy when I flip it at full elevator and sometimes with my fingers full negative at idle up. I think that is what you described.
How do I test for that on the bench?

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11-20-2006 08:29 PM  11 years agoPost 7
caseyjholmes

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Portland, Oregon

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Disconnect the motor and set 'er on the bench under power with TX on.

Click to idle up (remember, motor is disconnected )

Move the swash to all extremes full positive and negative pitch, While holding full aileron AND elevator and be sure nothing binds. The swash should not touch the shaft collar, the washout base should not touch the rotor head block, and none of the free moving rotor head parts should touch each other, other than at their pivot points.

Other than that, you might just be flipping too fast for the blades you are using. I see you are at 120% D/R, so you can decrease that to about 100-105 and see if that helps, or try some really stiff carbons and a fresh set of dampeners

The new align 325 real carbon fibers are a good choice for stiff blades at a good price. I found they tracked as well as my KOK's, but not quite as much lift and "rebound" there to them..

Also, some times belt tension will cause a bit of tail hold loss. You have it fairly loose right? Too tight will rob motor power and keep tail from holding as good.

If you see any black marks on your idler pulley on the tail case, the belt is too tight.

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11-20-2006 08:47 PM  11 years agoPost 8
Rennster

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Hawaii

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Thanks I was using ALIGN 325 pro woodies. Now they are ALIGN 50 pencil making material.
I think that was my problem with too much elevator cyclic pitch and increased negative pitch. I crahsed yesterday when I tried to do a flip and it turned into an ugly loop over my head and into the road. So I wasn't sure if my fingers did not pull the stick enough or my flip rate was too slow...s of course it can't be me and ended up repairing the heli and increasing pitch and elevator throw.
Frustrating....should I buy a Raptor 50?

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11-20-2006 08:49 PM  11 years agoPost 9
caseyjholmes

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Portland, Oregon

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Rebuild it and do it again till you have it down perfect. Hone your skills on a small heli, and you will be amazed with what you can do on a big one

Look at that crashed heli as if it were the first day you bought it Remember how stoked you were? Time to get it flying again huh?
Use that as your inspiration.

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11-20-2006 11:58 PM  11 years agoPost 10
avatar71

rrApprentice

East Amherst, NY

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Frustrating....should I buy a Raptor 50?
of course, everyone should have a raptor 50!

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Other › did a flip heard a crack then CRASH!
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