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Old 06-19-2022, 10:48 AM
Teal Teal is offline
Join Date: Jun 2022
Location: buckeye
Posts: 37
Default RV9 200HP Yamaha Sidewinder

Hello everyone,
I removed a Lycoming 0-235 from my RV9 and installed a Yamaha Sidewinder snowmobile engine. I know, I know I'm crazy what did you do that for....etc. The engine currently in stock tune on the fully programable ECU is set a little over 200hp from sea level to about 10kft. Currently at 15kft I can still make about 165hp according to the engine display.
It will climb out of my 1000MSL airport at over 2500FPM and at 15kft it will still climb at about 2000FPM.
Currently I can not maintain full throttle with OAT's above about 75f but I am installing a new radiator soon that should cure that.
I currently have only 7 hours of testing but the numbers are really great so far. The weight is 31lbs lighter with this engine over the 0-235 but I added the constant speed propeller. I also used the OEM cat iron exhaust manifold since I needed the weight. I pushed the engine away from firewall and used the stock turbo location which is between engine and firewall. Pushed the battery out on the engine mount and the CG ended up within .2" of the previous CG.
Biggest challenge currently is keeping the engine from overheating during Taxi but I will be adding radiator fans shortly for that.
I do not have real good fuel flow numbers yet at the lower Hp's. I know that it will burn 19GPH at wot anything under about 12kft. but that will yield a true airspeed of about 205MPH.
I am currently unhappy with the propeller blade selection for high altitude performance. It seems that there is not enough blade surface area to absorb the HP in the thinner air. Currently shopping for other options.
here is a few pictures of the install and the aircraft.
http:// /> .jpg?dl=0
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Old 06-19-2022, 10:54 AM
Foghorn's Avatar
Foghorn Foghorn is offline
Join Date: Feb 2018
Location: Virginia Beach
Posts: 316

Thatís pretty cool! Please keep the info coming. Iím holding out for an affordable turbine. 😳
Jeff Parker
RV8 Fastback (Tomís Dream) - Phase II (N767TS)
C195 (Red Dawg) - Flying (N4469C)
Retired Army CW4 - Helicopters, KingAirs, B737, MD11
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Old 06-19-2022, 10:55 AM
Dad's RV-10 Dad's RV-10 is offline
Join Date: Jan 2005
Location: FL Gulf Coast & NYC
Posts: 345

Pics posted from Dropbox link:

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Last edited by Dad's RV-10 : 06-19-2022 at 03:00 PM.
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Old 06-19-2022, 11:03 AM
Mike S's Avatar
Mike S Mike S is offline
Senior Curmudgeon
Join Date: Sep 2005
Location: Dayton Airpark, NV A34
Posts: 16,607
Default Welcome to VAF

Teal, welcome aboard the good ship VAF

Congrats on the successful conversion to the Yamaha.

Did you consider the factory VNE numbers??? Methinks you are very capable of blowing well past them.

Good luck with the continued test, and please keep up with the reports.
Mike Starkey
VAF 909

Rv-10, N210LM.

Flying as of 12/4/2010

Phase 1 done, 2/4/2011

Sold after 240+ wonderful hours of flight.

"Flying the airplane is more important than radioing your plight to a person on the ground incapable of understanding or doing anything about it."
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Old 06-19-2022, 02:44 PM
Teal Teal is offline
Join Date: Jun 2022
Location: buckeye
Posts: 37

At current HP levels (205hp) at 2000MSL. I can achieve 194mph IAS at wot straight and level flight.

Last edited by Teal : 06-19-2022 at 02:58 PM.
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Old 06-19-2022, 11:08 AM
PilotjohnS PilotjohnS is offline
Join Date: Jan 2016
Location: Southwest, USA
Posts: 2,601
Default Bravo

Bravo, bravo, well done.

Please keep it safe.
John S

WARNING! Information presented in this post is my opinion. All users of info have sole responsibility for determining accuracy or suitability for their use.

Dues paid 2023, worth every penny

RV9A- Status:
98% done, 2% left to go
To Go: wing mounting, engine baffles, wing tips, move to airport
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Old 06-19-2022, 12:06 PM
Ironflight's Avatar
Ironflight Ironflight is offline
VAF Moderator / Line Boy
Join Date: Jan 2005
Location: Dayton, NV
Posts: 13,308

Keep up the reports! I have flown other aircraft with the Yamaha engines, and have wondered when someone would try one on an RV….so it will be great to hear your experiences. As has been pointed out, watch those TAS Vne numbers….and have a blast!
Paul F. Dye
Editor at Large - KITPLANES Magazine
RV-8 - N188PD - "Valkyrie"
RV-6 (By Marriage) - N164MS - "Mikey"
RV-3B - N13PL - "Tsamsiyu"
A&P, EAA Tech Counselor/Flight Advisor
Dayton Valley Airpark (A34)
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Old 06-19-2022, 12:52 PM
blaplante blaplante is offline
Join Date: Jan 2010
Location: Southern California
Posts: 553
Default Reduction Drive?

Is the reduction drive from Yamaha? Is it designed for the thrust load?
RV6A in phase 2 as of April 2016
Donation made Dec 2022
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Old 06-19-2022, 02:18 PM
Teal Teal is offline
Join Date: Jun 2022
Location: buckeye
Posts: 37

Originally Posted by blaplante View Post
Is the reduction drive from Yamaha? Is it designed for the thrust load?
The reduction drive is SkyTrax specifically desgned for this engine. Yes, designed for much more thrust than this.
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Old 06-19-2022, 12:58 PM
rv6ejguy's Avatar
rv6ejguy rv6ejguy is offline
Join Date: Mar 2005
Location: Calgary, Canada
Posts: 6,448

Very cool! Keep us updated as you build more time on it.

Ross Farnham, Calgary, Alberta
Turbo Subaru EJ22, SDS EFI, Marcotte M-300, IVO, Shorai- RV6A C-GVZX flying from CYBW since 2003- 462.1 hrs. on the Hobbs,
RV10 95% built- Sold 2016

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