I found mine to be just about spot on with a 62"D x 66"P Prop from Prince Propellers. This was with tuned headers, emags, 8.5:1 pistons and new cylinders. A 60 x 70 prop is asking an awful lot from that little engine.
The following is my writeup on flight testing as posted on my web site in Jan 2014: ---- Someone emailed me asking what kind of speeds I see out of this plane. I was going to write back referencing this web page. Then I read it and found that while I put lots of probably meaningless information on here about oil temps, CHTs, and EGTs, I neglected to put out any kind of speed numbers. Up until my October trip, the lack of speed information was intentional as I rarely ever get to do any testing below 8500'. My plane simply does not perform at it's best at 8500 and higher, which is where I do nearly all my flying. (I was based at a mountain airport at 7200'MSL) So what did I find while flying down low? During my October trip, I found that at 4000'MSL and below at gross weight (1200# gross), my KR cranked along at a solid 158 kts (182 mph) with the engine turning 2800 rpm, which is about 50 rpm over red line. But that is full throttle cruise, not a normal cruise. I had to be very careful during descents to avoid overspeeding the airframe's VNE of 170 kts (195 mph). A more reasonable cruise was at 140 - 145 kts. At higher altitudes where I normally have to fly (in northern NM), I usually flight plan for 140 kts and that seems to work out pretty good for a normal cruise. I can't keep up with the RV crowd, but this plane was never intended to do that. But for an fast economical plane, it does it's job exceptionally well. ---- -Jeff Scott Arkansas Ozarks > Sent: Tuesday, December 30, 2025 at 5:05 PM > From: "Phillip Matheson via KRnet" <[email protected]> > To: "Mustang Group" <[email protected]> > Cc: "Phillip Matheson" <[email protected]>, "KRnet" > <[email protected]> > Subject: KRnet> 0200 propeller KR2ss > > Happy new year to you all > On going 0200A prop concerns. > My engine has been overhauled, new cylinders and pistons extra ?? Now 110 > hours. > > I have a new 59x66p prop and my 0200 still won’t turn it as expected??? > I’m told by makers and many others it should turn 60x70p. As was my original- > > But it would only get > Static 2200 > WOT 2400 > > New 59x66 > Static 2300 > WOT just 2500 > > I have a borrowed > 68x59 > Static 2350 > WOT 3000. Much getter to fly but too slow. > So. What is going on?? I can’t keep buying new props. > > Prop makers are blaming my engine???? > > Comments please from anyone with similar prop sizes on there 0200. > Thanks > Phil matheson > Ps. Can’t find any other sizes to borrow, and test??? > > Sent from my iPhone > -- > KRnet mailing list > [email protected] > https://list.krnet.org/mailman/listinfo/krnet > -- KRnet mailing list [email protected] https://list.krnet.org/mailman/listinfo/krnet
