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HelicopterMain Discussion › hummingbird wont take off
04-26-2004 11:10 AM  13 years agoPost 1
dmstew

rrNovice

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I bought a hummingbird from ebay about two months ago, but it doesn't want to fly. It has enough power to slide around my garden, but wont take off. I replaced the battery for etec1200s, but no luck. I assumed it could only be the motor, so replaced this with a Mabuchi gold label. After replacing the motor, and fully charging the etecs, it flew fine for about a day. Then for no apparent reason it just stopped flying, and barely has enough power to slide around on the grass. I checked the power going to the motor and it was 7.25V which seems fine. Does anybody have an idea what the promlem might be? Could it be a problem with the speed controller (which I know nothing about) ?
Also, I noticed that the shaft that connects the cog at the bottom to the blades at the top can move up and down by about a centimetre (although it always stays connected to the cog). I don't think this is causing the problem, but surely this is not supposed to move. PLEASE HELP!

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04-26-2004 11:39 AM  13 years agoPost 2
Saint728

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Honolulu, Hawaii

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It could be that your main pinion gear has come loose or is slipping a bit? You could try putting a new one on or drip a bit a CA on it and see what happends? Your main gear could be too close to your pinion gear causing too much friction? That's about all I can think of why your Hummingbird won't take off anymore. Good luck fixing your helicopter.

Take Care,
Cheers, Patrick

Check the hotties in my Gallery
http://rc.runryder.com/helicopter/gallery/9019/?all=photo

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04-26-2004 01:02 PM  13 years agoPost 3
dmstew

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Cheers mate. I've discovered something else, but please excuse my complete lack of technical terms... just below the fly bars are two vertical plastic bits (about 1.5 cm long). There should be two horizontal bits that connect the main shaft to the middle of these, whic have both snapped off. Maybe this explains why there is some movement? Also, last time I tried to fly it, I noticed that the centre of the big cog got hot. This would make sense if the shaft is slipping and causing friction with the cog. The problem is that I don't know how to dismantle the cog/shaft. Does it pull out, scew out, is it glued??? I tried to pull it apart, but it seems pretty stuck. Any thoughts?

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04-26-2004 11:12 PM  13 years agoPost 4
sundayflyer

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Cedar Rapids

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main shaft on humming bird

On the top near the blade grips you will see a pin running thru the top of the whole head. You must punch this pin out before you can take off the main shaft. If you go to http://www.centuryheli.com and click on the humming bird stuff there is a downloadable printable manual for the humming bird. The main shaft is easy to change but it is tedious.
Thanks,
Duane

with a big enough motor I can make a brick fly:EVO .50,GY502,OS.50,GV-1,JR 10xHAWK SPORT,OS.32,G

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HelicopterMain Discussion › hummingbird wont take off
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