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HelicopterCentury Radikal G20-30 N640 Hawk Predator › Tail drive shaft does not stay in coupling
12-27-2008 05:24 AM  8 years agoPost 1
Chansey Dog

rrNovice

Forest Hill, MD -​USA

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Today the tail shaft came out of the coupling and starting spinning when I was about about a foot of the ground. This has happened before and I'm wondering if there's any way to keep the shaft from popping out of the coupling. Thanks.

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12-27-2008 05:32 AM  8 years agoPost 2
Blade_Master1

rrElite Veteran

Canada

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sounds like the tail boom isn't fully seated

slacken all of the frame bolts around the Tail including the canopy mounts and the one bolt under the tail output gear to make things easy if you installed the anti-rotation bracket loosen 1 side as well
you will feel it lock in place

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12-27-2008 01:52 PM  8 years agoPost 3
Mutt

rrKey Veteran

M ca usa

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exactly what it sounds like.

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12-27-2008 07:52 PM  8 years agoPost 4
imnxtc

rrVeteran

BC.Canada

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And once in place, I have always drilled a small 1/16 inch hole through the tube in the mounting area (you will notice there is already one in the plastic of the mainframe) and insert a short self taping screw to insure the boom cannot slide back in flight.

I have always done this to all my shaft driven helis since my first (a MinAir X-Cell in 1988 or 89).

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12-28-2008 03:01 AM  8 years agoPost 5
Chansey Dog

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Forest Hill, MD -​USA

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Thanks guys. I put it back in place and tightened up the screws real good. Flew nicely today.

I will also try imnxtc's trick.

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12-28-2008 03:27 AM  8 years agoPost 6
Mutt

rrKey Veteran

M ca usa

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All the years I been flying and all the ones I have setup I never needed to do a set screw. Once the tube is in place properly and the screws tight it wont go anywheres.

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12-28-2008 07:27 AM  8 years agoPost 7
Human_Enigma

rrApprentice

Seattle Wa

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I would be concerned about breaching an opening in the tail boom so close to the moment of force, especially if you like whacking the tail of your heli around as violently as most do. Drilling a hole near the connection could lead itself to vibration fatigue, cracking and eventually failure.

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HelicopterCentury Radikal G20-30 N640 Hawk Predator › Tail drive shaft does not stay in coupling
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