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Old 05-16-2021, 11:16 AM
EdH's Avatar
EdH EdH is offline
Join Date: Jun 2010
Location: Wiltshire, UK.
Posts: 227

Rotax certified the 916iS last summer, 157hp for 5 mins then 134hp max continuous from sea level to 23,000ft. No fanfare... for a covert client.
RV-3B G-CCTG - Purchased May 2020
RV-8 G-MIRV - First flight 1 July 2019
RV-6 G-BZRV - Flown the nest.
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Old 05-16-2021, 07:36 PM
tjo tjo is offline
Join Date: Dec 2009
Location: La Center,wa
Posts: 242

The problem with the Rotax 915 from my perspective:
- weight and balance
- high cost
- could run mogas, but impractical due to on airport availability (or lack of)
- limited or expensive constant speed prop availability
- roll your own FWF package

If you can overcome these, or they are not an issue for you, then do it. Performance should be fine. My choice, though, is a Lycoming.

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Old 05-16-2021, 08:41 PM
jliltd jliltd is offline
Join Date: Sep 2013
Location: Rancho San Lorenzo
Posts: 1,072

Originally Posted by NinerBikes View Post
Need to add some weight to the nose? Get a constant speed prop for the 915iS
My understanding is that the 915is needs a constant-speed prop to operate properly. It has something to do with how the oil circulates through the crankshaft. At least that was what Rotax stipulated four years ago when the 915is was hitting the real production market. That was one of the "no go" items for USA-based by LSAs as constant speed props ae not allowed. Plus having one could easily have pushed the slicker LSAs past the maximum allowed. Perhaps there has been an accommodation like a crankshaft oil bypass valve for fixed-pitched propellers in the last 4 years.

(and a few more airplanes)
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Old 05-17-2021, 07:30 PM
NordicDave NordicDave is offline
Join Date: Oct 2020
Location: KSNS
Posts: 33

An STC is now available for the Rotax retrofit to a Cessna 150.
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Old 05-17-2021, 08:00 PM
jliltd jliltd is offline
Join Date: Sep 2013
Location: Rancho San Lorenzo
Posts: 1,072

That's an amazing development for the Cessna 150. A Rotax 915is with constant-speed prop STC. Add a tailwheel conversion to an early model and it would be a great bush plane.
(and a few more airplanes)
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Old 05-18-2021, 04:34 AM
Major-Tom's Avatar
Major-Tom Major-Tom is offline
Join Date: Jul 2018
Location: Templin (Germany)
Posts: 67

Originally Posted by Diego9 View Post
combination of moving the engine FW and adding some mass in the engine area

A ballistic parashute system would be a nice extra mass for many builders! The european version of the CH650 has ist BRS firewall forward.
D-MDYZ ICP Savannah-S built, flying, sold
D-ERVM RV-12iS #121128 99% done, waiting for first flight admission
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