Anybody have any experience with Air Trikes SPG 4 Re-drive? They have flying examples with a lot of 120 horsepower and
lower engines. It is rated at 180 hp and has a BMW flex coupler as the damper. Would it be an appropriate PSRU for a na
13B? I would appreciate any input.

A. Mullen

These are spur gear boxes.
I think the gear boxes were made in New Zealand

The company (auto-flight) appears to be out of biz.

I could be wrong.

Rotomax used them and it is rumored to be the cause of their crash.

However there are a bunch of different gear boxes that look like
that including Hirth and Rotax.

Basically a planetary is six times stronger for a given gear width
and the gear mesh does not change with temperature as it does with spur
gear boxes.

Is cost your issue?

Paul Lamar


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