John, I did just as Dan outlined: Asked Ed Sterba for the right cruise prop. So far I have only made three flights on my KR-2, had CG and oil temperature problems. Now in process of fixing those problems. My top speed has been 106 kts with limited engine speed on purpose due to oil temps. Static run up on the ground is 3010 RPM. I definitely have a cruise prop, but have not had the opportunity to check max cruise speed. Perhaps this spring I will have more data.
Sid Wood Tri-gear KR-2 N6242 Mechanicsville, MD, USA > ------------------------------ > >> > I have always used the "ask Ed Sterba" approach to this problem. I tell > him what I have and he tells me what prop to use. It may not be perfect, > but it won't hurt you and he will always re-pitch it for you at no charge. > > Dan Heath > >> On Nov 12, 2013, at 8:55 AM, "Patterson, John E Col USAF ANG 183 MSG/CC" >> <john.patterson.3 at ang.af.mil> wrote: >> >> Sid, how did you arrive at a 52x52 prop? My stock KR-2S (formerly Steve >> Vitrella's) with a Great Plains-ish VW 2180 has a 54x48 on it, but Steve >> Bennett recommends a 52x46. I haven't changed it yet, but I'm curious as >> to >> the whole prop selection process. Seems like there are a bunch of >> options >> out there. >> >> John Patterson >> N808BS >> Jacksonville, IL >> >> -----Original Message----- >> >> Still sanding the Styrofoam to make a plug mold for a new cowl on my >> tri-gear KR-2. Driven by the need for speed, my aerodynamics 101 says to >> hide everything that sticks out from the hurricane/typhoon force winds >> created by the Great Plains 2180 VW and 52X52 Sterba prop. So, starting >> with a clean sheet of 2-inch, 6-pound foam from Lowes, about 2/3 got hot >> melt glued on the engine and firewall. Now about 1/3 of that is getting >> chopped, sawed and sanded off. The plug is emerging. To bad the plug >> will >> get scrapped when the fiber-glassing is done. >> The reason for this artistic exercise is: Moved the engine two inches >> forward for better CG. Added a Revmaster oil cooler, fuel pump and oil >> filter. So the old RR cowl does not fit. >> Did I mention how much I loved sanding - NOT! >> >> Sid Wood >> Tri-gear KR-2 N6242 >> Mechanicsville, MD, USA >>
