??? on the Wankle rotary

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Doran

Member
Joined
Jul 31, 2016
Messages
11
Location
United States
Hello..
Has anyone installed a Wankle rotary on a KR2?
I am picking up an older but complete airframe tomorrow morning. It has been in climate controlled storage for some years but a thorough inspection is in order.
There is a Wankle conversion for sale locally but any input would be GREATLY aporeciated.
 

Vigilant1

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Lifetime Supporter
Joined
Jan 24, 2011
Messages
4,514
Location
US
Hello..
Has anyone installed a Wankle rotary on a KR2?
I am picking up an older but complete airframe tomorrow morning. It has been in climate controlled storage for some years but a thorough inspection is in order.
There is a Wankle conversion for sale locally but any input would be GREATLY aporeciated.
I don't think you can make the weight work. A twin-rotor 13B with a PSRU, prop, exhaust, carb, etc will run about 300 lbs. With heroic measures (a single rotor, or a twin with all aluminum housings and some ballast in the tail, etc) maybe it could be made to work, but short of that, the 13b and the KR2 are nt a natural match.
 

Billrsv4

Well-Known Member
Joined
Sep 29, 2016
Messages
129
Location
NW Oregon
Vigilant,
A 2 rotor built well with a 45 pound reduction drive should come in at 240 pounds using iron housings. Aluminum side plates would come in at under 200. Much more expensive. The other thing is would the HP be more than you should use for the airframe. We have put a 2 rotor on an RV-3. We are concerned that 185 HP in an RV-3 would be capable of putting the 3 in the flutter zone speed wise. We may need a block on throttle quadrant. Be sure of your airframe before putting that rotary on a KR-2.
Bill
 

rv7charlie

Well-Known Member
Joined
Nov 17, 2014
Messages
540
Location
Jackson
My complete Renesis (later model, lighter version of the 13B) FWF package weighed 310 lbs dry. Getting it below 300 lbs would be a real struggle. Way too heavy for a KR-2. Also way too much HP (yes, you can have too much HP). The Aixro would probably be a good suggestion, if you really want a rotary. If pistons are still a possibility for you, take a look at some of the snowmobile & watercraft engines. Examples:
http://mohawkaerocraft.com/
https://www.google.com/search?espv=2&q=skytrax+yamaha+conversion&oq=skytrax+yamaha+conversion&gs_l=serp.12...2872.2872.0.4852.1.1.0.0.0.0.113.113.0j1.1.0....0...1c.1.64.serp..0.0.0.4ob68pJPpws

Some indications out there that you can have a flyable FWF at around 200 lbs.

Charlie
 
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