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HelicopterBeginners Corner › blades struck tail boom
11-26-2007 11:33 AM  9 years agoPost 1
sstrieg

rrNovice

red lion,pa

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I don,t know how it happened but i was hovering my venture 30 and some how or another the blade struck the tail boom and dented the tail boom and messed up the blade .after it happened i tried to push the blade down towards my tail boom and it wouldn,t go no where close to it .i replaced blades ,little shaft that goes betwen main blade holders,and dampers. but now when i fly it the training gear shake all over the place any ideals i don,t think it hit hard enough to bend the main shaft. what do you think thanks steve

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11-26-2007 12:42 PM  9 years agoPost 2
DJDAZ

rrVeteran

Perth Western Australia

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You would be suprised just how easy it is to bend a mainshaft, and just how much difference a bent one can make!

I'd start by replacing it and then if it isnt the problem then you will have one as a spare.

Also check the boom careful, a boom that is bent will cause a lot of vibration probs too!

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11-26-2007 12:56 PM  9 years agoPost 3
Gary H

rrVeteran

Minnesota USA

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As DJDAS said something is bent some ware, I did the same this early spring, my linkage was bent , I had a heavy tail strike. chech every thing over real close, should find it. Mainshaft #1 check.

Gary H

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11-26-2007 07:22 PM  9 years agoPost 4
vavavoom

rrVeteran

London, England

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Like the other chaps mentioned, the main shaft is the prime candidiate for your problems. It only has to be out a very small amount to cause a wobble.
The only real way to check is to remove it from the heli and roll it on some glass ie a mirror. If it doesnt roll completely smoothly wihout any gaps along the length then it needs changing.
A boom strike often bends the main shaft.
There are two, perhaps three reasons for a boom strike that can be caused by non mechanical failure. These are
1. Loose blades in the grips allowing them to lag under load and clip the boom
2. A large amount of negative pitch while landing tail first
3. Worn dampers

## Inteligence is knowing a tomato is a fruit...Common sense is not putting it in a fruit salad

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11-26-2007 10:12 PM  9 years agoPost 5
Pistol Pete

rrProfessor

Seffner, FL

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after it happened i tried to push the blade down towards my tail boom and it wouldn,t go no where close to it

something to check just in case...the see saw.

~~Enjoying the hobby one flight at a time~~

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11-27-2007 12:15 PM  9 years agoPost 6
Eartaker

rrApprentice

Tacoma, WA

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your blade grips were too lose. the blades pivot in the grip and then are able to hit the tail boom as it is spun up

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