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HelicopterCrashed? Discussion and Photos › Almost a crash!
10-24-2004 11:03 PM  13 years agoPost 1
frogbaiter

rrApprentice

Oxford UK

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It's been windy lately!

My Sceadu still has pretty naff servos on, but since I'm still just past the hovering stage and only starting to fly the heli round, I was waiting for a rainy day to swap them out for the 9252s sitting in my drawer.

Anyway, a couple of times lately, I though I saw the blades on my heli flutter strangely for a few seconds, but wasn't sure if it was a wind effect or not. Today it happened on my second flight, and then a little later it went a bit wild - the heli leapt up and down strangely - a bit like when the wind gusts but more violently. Before I knew what was happening, it was on the ground, safely, but scarily. I (stupidly?) decided after a moment of looking at it, to lift off again and bring it back where it sould have landed, and a very similar thing happened - no real control of altitude, and a bit of a heavy landing, though safe. Cut the engine, took it back to the pits.

On inspection, the collective servo was shot - presumably the gears stripped.

Moral? I think, if something doesn't feel right, land and check it over. If that had happened at altitude, or while it was in any kind of lateral flight, I might have had a real crash - also if it was a cyclic servo!

I think I have a lucky heli - completely unscathed so far!


Steve
www.helicollective.org.uk

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10-24-2004 11:14 PM  13 years agoPost 2
JuanRodriguez

rrProfessor

The Villages,​Florida

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frog,

The stripped servo is the "result" of the flutter problem you encountered, not the cause......this violent "flutter" is also known as the "woof" in the Raptor circles....

A friend locally had a flutter problem with his Sceadu which plagued him for some time and after replacing most of the head components with metal upgrades the problem went away..... he really doens't know what was the actual cause or cure.....

I had a woof problem on my R-50 and it stripped the gears on a JR 4131 (not a crap servo).... it turned out that the servo tray was loose causing enough flex on the collective system which caused the flutter....

I would be surprised if simply changing to 9252's will cure your problem but I could be wrong....

Let us know...

PS, the wind has nothing to do with this problem...

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10-24-2004 11:20 PM  13 years agoPost 3
frogbaiter

rrApprentice

Oxford UK

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Juan,

Yes, I know the wind was nothing to do with it, to some extent at least - it did cause me to wonder at first, though. I guess the fact that it was the collective servo, and I'd been having to work it pretty hard flying in the wind did make it a likely candidate for stress though!

I'll take a look at the servo tray, and perhaps see about changing to push/pull linkages as well to help.

Not happy at the prospect of losing a 9252 the same way!


Steve
www.helicollective.org.uk

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10-24-2004 11:39 PM  13 years agoPost 4
steve69

rrApprentice

Berkshire, UK.

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Yup, that sure was a lucky escape there steve, we had one more flight each then gave up and went flying the zagi's!

A much more better idea considering how bad the wind got, and the plus side is you can crash as often as you like with the zagi (which is just as well considering how well I can fly)

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10-25-2004 04:20 PM  13 years agoPost 5
blakka_1

rrElite Veteran

London/Enfield

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good thing you saw the problem early. well done

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10-26-2004 08:42 AM  13 years agoPost 6
MatrixMan

rrApprentice

Oxford UK

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Someone up high is definatly looking down on you protecting that heli!

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