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Ark › Help- Home-made front tail drive pulley?
11-22-2006 05:23 PM  11 years agoPost 1
helimatt

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Lafayette, IN

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I stripped my plastic front pulley (belt too loose, apparently- was able to land fine, so no other damage). I can order a MicroHeli metal pulley (ideal), but I'd have to wait for it and couldn't fly this weekend. I have a Trex pully/shaft assembly with gear, but gear size and shaft length is different, would take some modifications and slow down my tail rotor speed (might not be a bad thing, perhaps). Anyhow, has anyone out there made up a front pulley? I saw someone used a pinion for a rear pulley. Perhaps that with some coned washers top and bottom?

Does the normal pulley design allow the belt teeth to contact the pulley both at the tip and root of the tooth? A pinion-pulley may only have the contact at the belt tooth root/pulley tip.

Help anyone, I have a shop and a little time, but don't want to break a bunch of belts (or worse) if I can get a leg up. Thanks, happy Thanksgiving to those here in the US (everyone else- just have a happy day anyhow.)

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11-23-2006 03:06 PM  11 years agoPost 2
helimatt

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Lafayette, IN

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So I made up a new pulley from a 10T pinion (from Blade CP), which I machined out to give the oval/flat inside to fit the shaft with the flats. I used the upper and lower shoulders from nylon pinion, and bolted it all up. Looks good. I looked at the fit of the belt to the pinion teeth under a microscope, and they mesh very well.

It runs smoothly on the bench, but I will fly it later today or tomorrow. Should work fine, but I will keep a close eye on the belt condition to see if it wears prematurely. I am lubing the belt with lithium grease.

Stay tuned, could be a nice alternate solution for those of us who like to fiddle with these things. The MicroHeli metal pulley is probably the best solution, in the end, but this may work just as well.

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11-23-2006 07:21 PM  11 years agoPost 3
BikeNBoatN

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Santa Ana, CA USA

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I am lubing the belt with lithium grease.
That will make the belt rather sticky, picking up dirt particles which act like little miniature knives slicing up the rubber. Not a real good idea. A dry lube like silicone spray is better.

Brent
Slow and Smooth 2-D Scale Flyer
AMA #35431

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11-24-2006 11:55 PM  11 years agoPost 4
helimatt

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Lafayette, IN

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Thanks for the advice, Brent, I had heard others say so, and will try silicone to- see which I like better overall.

I flew the home-made tail drive pulley about 4 flights today- loops, rolls, flips, (the best stuff I've got so far), and it is behaving well. I'm going to take the belt out and examine it very closely to see if the pinion-pulley is causing early wear. So far, I'd call this experiment a success. I'll put up some pics when I've got it apart.

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