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MPJET Gearbox Broke... Now what????

Old 08-14-2004, 10:54 AM
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Default MPJET Gearbox Broke... Now what????

Last weekend I took my 2M modified Spirit Glider for a fly for the 3rd time... Damn winter.. Cant fly much when it is raining and windy... and COLD!!!

Anyway, my setup was a MEGA 16/15/3, MPJET 3.8:1 planetary gearbox , Castle Creation Phoenix 45, 7-cell KAN1050 and a 13x8 prop...

Now that for some reason, the pinion gear and/or outgear managed to destroy itself, I am left with a couple of options that I have been thinking about...

1. Replace the MPJET with another MPJET Gearbox and see how long this one lasts....
2. Replace the gearbox with one that can handle more power (such as a MAXON gearbox)...
3. Replace the 13x8 with a smaller prop (say a 6x5) and go direct drive....

I've had a quick look on the forum, but havent come across a similar problem...

I know going direct drive with a 15/15/3 would draw more amps, but I'm not sure how it would change if I go to a smaller prop...

Any comments?? Opinions?? Solutions???


Old 08-16-2004, 12:04 PM
Matt Kirsch
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Default RE: MPJET Gearbox Broke... Now what????

On a glider, I wouldn't even think of going direct drive, regardless of the other factors involved. Gliders/sailplanes fly much too slowly, nowhere near the 60-70MPH pitch speed of a 6x4 prop direct drive on a Mega 16/15/3. This means the prop is wasting most of its power thrashing about in turbulent air. On something small and sleek it's a different story.

That leaves you with the gearbox choices. Unless the gear lash was way off, another MPJet probably won't hold up any better than this one, which leaves you with seeking out a different gearbox.
Old 08-17-2004, 07:56 PM
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Default RE: MPJET Gearbox Broke... Now what????

Blue dont throw your MP Jet away you can get a new ring gear and pinion at Aircraft world for about 6 dollars US.

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