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HomeAircraftHelicopterHenseleit 3DNT - Rocket - 3DMP › 3D NT Snapped main shaft!
05-08-2005 07:20 PM  13 years agoPost 1
chappers

rrApprentice

north east of england

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hi guys, any one experienced a Snapped Main Shaft? Dunno what happened to mine today, fast backward flight, suddenly started pirouetting, put its nose down and tried to dig a hole for its self!!?? Fortunatly because i was low damage was limited ( blades flybar etc ) however the Mainshaft was "snapped" inside the head block at the head fixing bolt. Im assuming this was a result of the crash and not the cause? any and all suggestions/comments most welcome.

stay happy

keith

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05-08-2005 09:16 PM  13 years agoPost 2
DangerousDick

rrVeteran

Cheshire, England

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If it'd snapped in flight then you wouldn't have broken the blades - they'd have spun up and away from the mechanics .

Sudden pirouette could be belt, blades, pitch rod, servo, gyro, engine, pulley - there's plenty to go wrong on a heli.

I've gone through a fair old amount of main shafts for my 3DNT's but never managed to snap one yet (as far as I can remember ).

Cheers
Richard.

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05-08-2005 10:47 PM  13 years agoPost 3
RussD

rrVeteran

UK

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Hi Keith,

Never seen or heard of a snapped mast on a NT... but some of the early rotor head blocks tended to rock on the mast. I guess a constant rocking could have the un-desired effect????

I cured the rocking by putting a razor saw cut up to the bolt fixing on the head block (at 90 degrees to the bolt) so the bolt would clamp the head to the mast. Later 3D NT heads have this slit ;-)

RussD.

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05-09-2005 05:04 PM  13 years agoPost 4
chappers

rrApprentice

north east of england

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cheers guys. ill try that trick Russ if its loose when i rebuild

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