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Helis and fixed wing

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Thursday, March 14, 2013

HDX500: Yeah... its always something

On isolating vibrations troubleshooting the brown out and jittery servo problem, I found out the tail blade hub had a bent feathering shaft.
 
Parts for the HDX500se/Lepton are hard to come by. CNChelicopter carries many of the parts, so I went there and bought the last tail hub, and for good measure a couple of tail shafts (mine remains unbent).
 
Well, its not quite the same. The original (bottom smaller one) has a one stage 3mm shaft and is shorter. It uses 2-3x8x3 ball bearings on each side.
 
The new one is on top. It has a first stage that's 4mm for the ball bearings, then steps down to 3mm for thrust bearings. This arrangement is usually seen on the main rotor, I've not seen in on the tail, but the bigger the heli it makes sense. I will need 2-4x8x3 bearings on each side, and thrust bearings. I have the latter on hand, for a 450 main rotor crash stock. This will be assembled like a mini main rotor.
 
I checked with my usual bearing provider (Avid) and they are out, so I Googled and found another of my favorite sellers has them (WOWHobbies), for the Blade 300 I think. Correct bearing, comes 3 to a pack, of course, so I had to order two packs, about $6 a pop.
 
Now I wait. I expect this to go together just fine. At least that's what I tell myself. Still waiting for the HURC programming card and the back up Hobbywing ESC/BEC if that doesn't work.

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