Randy with Rans posted this article about the potential for the UL 350 Engine in the Rans S7.

http://rans.com/aircraft/itf_articles/itf-12.html

A few of his comments:

Flying against a factory built S-7LS proved out that engine does out climb the 100HP Rotax.

No real speed increase was measured, mostly because we were not apples to apples on the test planes. The good news it was doing 102 MPH, with the 30" Alaskan Bush Wheels.

Pretty interesting. May see this engine as an option for the S-20 Raven also.

Me like.

UL engines are having success on Highlanders and Zenith CH 750's. lightweight, air cooled, digital ignition systems. Experimentals get all the good stuff. If I were building another plane at the moment, this would be my engine.

I would love to see a thrust shootout like the one Aktahoe1 did with his propellers. I have a hard time believing that a prop turning that fast will out pull per dollar of fuel compared to the Rotax. But what do I know.

EB

Emory Bored wrote:I would love to see a thrust shootout like the one Aktahoe1 did with his propellers. I have a hard time believing that a prop turning that fast will out pull per dollar of fuel compared to the Rotax. But what do I know.

EB

If the prop is designed for that RPM, why not? Thrust is a product of all the factors: torque, rpm, pitch, length, etc with air density being the only constant in a controlled test. Power is power, so as long as the prop is optimized for 3000 RPM or whatever this thing make max power at, and it's not going supersonic, seems like it would best a 912 in that dept.

Weight, cooling, etc... those are other factors. I think the Rotax has the upper hand there.

Emory Bored wrote:I would love to see a thrust shootout like the one Aktahoe1 did with his propellers. I have a hard time believing that a prop turning that fast will out pull per dollar of fuel compared to the Rotax. But what do I know.

EB

The write up from Rans stated 5.8 gph. to get those specs. My Rotax rarely burns more the 4 except in an extended climb fully loaded (rare)or extended max cruise runs (really rare).
My normal 90mph cruise yields around 3.5 and it jumps to 4.5 at 100mph. That's with 8:50's not the big ABW's that Rans was testing with.

I really hope it works out well. I am very interested in hanging one on mine in a year or two. I'm more interested in the reliability figures.
Hard to beat the Rotax on that front.