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



There is an ultralite dealer near Montreal Canada. An ex Russian
engineer run the show there, his name is Vassili Tarakanov. phone
450-202-7727 St Lazare Quebec.
or try his web site  airtrikes.net  or    info@airtrikes.net
I was looking for redrive for about 130 HP and another company Firewall
Forward wanted almost $10 G for a belt drive, so I found this SPG make,
which is more reasonably priced.
I have no experience with it, it would be a year + before I buy a drive,
if I need one at all that is.  There is prices in the site as well, I
like that.
Tony Lam




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