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Old 07-11-2017, 07:10 AM
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Phantom30 Phantom30 is offline
Join Date: Jul 2009
Location: Coeur d'Alene, ID/Casa Grande, AZ
Posts: 525
Default Rotax 915 build in 9A??

Has anyone considered building a 9A using a Rotax 915 engine? With turbo, I was wondering what the ceiling would be....and cruise at 24k.

Love my finished -12, but the building bug is starting to stir in me again😜
Ric Dickison
307 (CAB) Phantom
Search and Destroy (Can
Tho RVN)
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RV-12 Kit#729 "N312RD" is now a full functioning fun machine!! Thanks Van for fulfilling my dream😎
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Old 07-11-2017, 07:19 AM
rv7charlie rv7charlie is offline
Join Date: May 2006
Location: Pocahontas MS
Posts: 1,976

Go for it. But research lateral stability/spin recovery with the extended nose, and VNE issues (related to true airspeed; not indicated).

Oh, and whether you enjoy flying with an O2 mask all the time, and are comfortable with the additional risks of flying light a/c at those levels.

Of course, it might be a fun a/c even below the nosebleed levels.

The non-starter for me would be the cost/benefit analysis on that engine.
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Old 07-11-2017, 07:37 AM
Neal Trombley Neal Trombley is offline
Join Date: Aug 2016
Location: North Fort Myers
Posts: 175

Was there ever a cost published on this engine
Neal Trombley
SW Florida
EAA 66
N517NC ( reserved)
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July 2017
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Old 07-11-2017, 01:40 PM
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KRviator KRviator is offline
Join Date: Oct 2009
Location: Sydney, Aust.
Posts: 585

Personally I think the 915 would be the single best engine for a -9 IF the W&B could be made to work. AIUI, it is ~50lbs lighter than an O-235, and you could probably make some of that up with a CS prop.

It is also likely to be hediously expensive. I don't think you will see it retail for less than $35,000USD. Considering my O-340 cost $25K new the $$ mightn't work out unless you take a long-term view of potential fuel savings over the engine life.

Rotax parts are also quite expensive compared to lycoming and would need to be factored in too.
Once you have tasted flight you will forever walk the earth with your eyes turned skywards, for there you have been and there you will long to return - Leonardo DaVinci

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Old 07-11-2017, 05:52 PM
eric.the.blonde eric.the.blonde is offline
Join Date: Mar 2017
Location: Ann Arbor
Posts: 1

...and it takes unleaded fuel! But where to buy?
Eric G.
Ann Arbor, MI
RV-9A under construction (empennage)
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Old 07-11-2017, 06:42 PM
ksauce ksauce is offline
Join Date: Mar 2006
Location: Lititz, PA
Posts: 159

Rotax hasn't released the 915 yet. Most folks are expecting it to cost more than $30k given that the 914 sells for around $28k.
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