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03-14-2003 12:26 PM  14 years agoPost 1
Malorie

rrElite Veteran

Paw squared, MI

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After hunting around for the proper pinion for my Hornet and not having the patience to mailorder. I decided to use a slot-car pinion from the LHS (readily availible with a great selection in tooth count and materials). The only problem was that the maingear on the Hornet is a metric tooth and the slot-car pinion is an SAE tooth. Also the Hacker output shaft is too large by .02". After talking to one of the local slot-car pros, he suggested to lap-in the gear.

What you do is set up the mesh the same as you would with the proper gear so it has the proper backlash. Get some rubbing compound and smear it on the teeth. Run the motor through a couple of charges. You may need to reapply the rubbing compound a few times as it gets slung off all over the heli. Clean up the gears and heli to remove all the rubbing compound and you're all set.

I should mention that I turned the output shaft of my Hacker motor down by .02" to fit the standard slot-car pinion.

I now have an SAE maingear that runs nice and quiet and I have the option of going to a 9 tooth pinion if I decide to.

Cheers,
Malorie

Life's a journey, NOT a destination.

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03-14-2003 03:48 PM  14 years agoPost 2
Hoverup

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Golden Gulf Coast -​USA

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Malorie - slick idea. Glad it worked for you. The Hornet gears are all 64p and as such open the doors to all kinds or gearing without lapping. The AJ gears for slot cars work like a champ. I've been using these from NCP hobbies in Ohio for a couple years now with great results. A lot of the micro heli parts vendors repackage these and sell them at a mark-up (search and surf charges I guess).

Cheers - Boyd
AMA 80393
Major USAF
Retired

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03-15-2003 04:17 PM  14 years agoPost 3
Malorie

rrElite Veteran

Paw squared, MI

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I did this more as a quick fix. The 64P SAE pinions are readily availible to me at the LHS and I didn't have the patience to surf-and-order.

I've now had a chance to run this little hummer with the Li-Po pack. I think I'm going to try out a 9T pinion as the motor is getting hot. I haven't tacked it in yet but I will today. Maybe that will help the motor unload some.

Malorie

Life's a journey, NOT a destination.

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