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HomeScaleAircraftScale HeliScale Helicopter Main Discussion › VARIO COBRA GASSER REPORT
05-27-2015 03:07 PM  3 years agoPost 1
fenix2

rrNovice

Chile

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Hi again guys, as you red in my last posting Jan/15, regarding the metal gears for the 42 deg gearbox, I had 2 issues:

1.- Once again after 10 Tanks, the horizontal shaft of the 42deg gearbox
broke just after the coupler..same as in January..there are no misalignment issues, so I don't understand why. Maybe my flight style is too egressive for Vario stuff ( low level, hamerheads, bank turns.

Solution: I'll try to upgrade from 2mm to 3 mm shaft.

2.- I was flying in a slow forward and suddenly lost rotor rpm's but engine was running fine....autorotation and landed over a small bush...like a cotton bead!!!! very lucky..no damage at all.

I inspected and found that the pin that connects the main shaft with the oneway bearing was BROKEN!!! both tips were gone!!! I don't dare to ask Vario for an explanation cause they will answer that it might have been my breakfast that day!!! LOL.

Solution: I tried 2 alternatives:
a.- Made a new pin from an electric motor 3mm shaft.
b.- Made the final one from the rear part of a 3mm drill bit.

Both worked fine but the last one is harder steel. I also cut the pin edges at 90º so I have 100% contact with the bearing groove.

Pictures 1&2: coupler and part of the broken shaft
pictures 3&4: broken pin and new pin installed

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05-28-2015 05:55 PM  3 years agoPost 2
mookie

rrApprentice

UK

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Hi Fenix.

Thanks for the PM. Sorry to hear about your issues with the Gear Box. Hope you get it sorted out.

valve boy!

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