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With the DCM6748 prop, we are turning right close to redline at cruise as is. I really don't think I want to push that RPM any higher. I think I will still stick with keeping the replacement prop it's original pitch of 48. I suspect the 6948 isn't going to perform that much differently than the 6748. If I have come to understand this science about props, The added 2" should aid some in cruise. But I might loose a wee bit in take-off / Climb performance. It will be an interesting test.

I'm with Joe. Even if you are talking ground speed if that is your average it sounds good to me. The plane has its limitations due to drag alter all. Seems to me the pitch could help at altitude rather than down low. Gee those vg's seem to be the best mod for the dollar in the direction of the Cessna's strengths. Too bad they don't make variable pitch with electric control!

Just a prop that was capable of only two pitches would be great! One for take-off and climb and then switch to cruise!

The Beech Roby hand crank variable pitch prop was available as an option on the Cessna 140. Seems to me the Aeromatic was too but I'm not sure.

I had a friend who owned a Cessna 170A (N1448D, it was sold to someone in Australie) had a crosswind gear, provisions for a Janitrol heater, a Camera port (covered over) and the O-300A had a lever on the LH side of the case at the nose (designed to be push pull cable operated). Designed to port oil to a two speed hydraulic prop (which was not installed) The aircraft had belonged to the University of West Virginia and later was a "high altitude" photo plane.

Charles

I watched pretty close on my trip from Dallas to FLA and here is what I saw. 90 KIAS, 2450 RPM with about 6.8GPH @ 5500 feet. The highlight would have to be seeing a B-52 air to air.....from the top.

We were driving through Palmdale, CA (where the Lockeed Skunkworks is based) around Thanksgiving time. It was a real treat to see an F-117 stealth fighter working in the pattern. Of course there MAY have been more than just the one...I thought I saw a couple of spots in the sky that were shimmering a little <img src="/ubbthreads/images/graemlins/wink.gif" alt="" />

I remember in the late 50s or early 60s seeing a number of 170s with crosswind gear. I think Goodyear made them. I thought they were a real Rube Goldberg. I never flew one. They had a reputation for being quirky. I think most folks who had them got rid of them. You sure don't see them much these days.

George

Charles
I also have a friend that owned a 170A with the two speed prop. He bought it out in Montana and years later sold it to someone down south. The prop worked great especially on skis. The flat pitch gave more pull to get out of deep or sticky snow. I would have liked to see it perform on floats but he never put it on the water. The prop was kind of like the old hydromatic transmissions, Low and Go. I do not remember the complete tail # but the last 3 were 20A.
Kenny