ORIGINAL: Cyberwolf
Like I said im not at sea level, make's all the difference in the world and at one time APC did make a sport 18x6 but its no longer made. Just like the 13x8 is no longer made in the pattern but still made in the sport. Not any of my 160's will turn that prop over maybe 8 K 7600-7800 rings a bell at the most and spool up is slower than cold tar on 15 % nitro. I took it off and used a 16x10 that worked well, then I got the 9 K + your talking about Like I said you can't compair apples to oranges. Try running one of your engines at 4500 to 5000 feet and see what I mean, just try cause thats about all you will do W/O changeing props.
And really I want thrust not RPM's, the two don't always go hand in hand.
APC never made a APC 18X6, only 18X6W. I called and confirmed. The APC 17X8 is slightly more load. Having run and flown props, 18X6W, 17X8, 18X8, 18x8W, 19X8W, all APC, the 18X6W always provided better overall performance (thrust/speed) on the OS 160FX and the FX spins all these props faster than a DLE 30 can. That engine, when properly tuned can idle for over five minutes at 1800 rpm, jab the throttle and it will go full throttle with only the slightest hesitation and then throttle is quick after that.
Sounds like the thin air sucks the life out of engines, you'll be lucky to get 6500 rpm on a 19X8 whereas everyone else at lower altitude gets 7000-7200. What's the altitude where Jody lives?