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Old Feb 06, 2002, 06:40 PM
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Joined Oct 2001
178 Posts
Source for a 5,6, or 7 to 1 Gear Box for a sp400?

I have had good results from 3.4:1, 10 700Mah NiMH, and 11X7 apc prop. I put the figures through MotoCalc and things really get good at around 5-7 to 1 with a bigger prop. The highest ratio box I can find is 4 to 1. Any suggestions?
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Old Feb 07, 2002, 01:17 PM
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Berks, England
Joined Jun 2001
598 Posts
The highest I have seen in the shops is the Cosmotech (4.5:1). But listed in "Electric Flight Gearboxes" by Oliver Wennmacher are:
Conzelmann "Volksgetriebe", 5.4:1 and 4.3:1
Ludwig "CNC gearbox for 400 motors", 5.9:1 or less
Gross "Guppy", 6:1 or 5.29:1

I've no idea where these are available from. The author is from Germany, so I would try the mainland European distributors. The book is about 5 years old, so they might not still be around.

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