Great Planes PT-19 ARF

I recently bought one of these and have it ready to fly. I read the on line
review by Jerry Festa. He suggest a 16 x 8 prop on the OS 91 Surpass II.
This is the engine I'm using. This prop is a little above the range
suggested by the engine manufacturer. Also, he said his came out with the CG
right on with the battery under the tank and mine needs about 1-1/2 weight
on the tail with the battery as far back as possible. Have any of you had
experience with this plane? If so, what do you think of this prop and engine
combo. I plan to test fly it this weekend and would like to take it home in
one piece.
Thanks
David
Reply to
David
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WARNING, OPINION ALERT, WARNING
The 16x8 is within the realm of possibility for that engine depending on altitude, fuel type and prop brand 16x8 props vary a LOT from brand to brand but, If memory serves, my .01 Surpass (NOT the Surpass II) pulled around 7200 RPM on the ground with a MA 16x8 wood prop
My PERSONAL choice for any of the Saito or OS .91 engines is to start with something like a 14x6 APC , test fly the plane, and then adjust the final prop choice depending on the plane, and how YOU want it to perform. the 14x6 will be fast enough to fly the plane, and slow enough to land very slowly if the plane likes to float.
as to the balance issues, In my humble OPINION, the variation you describe is probably well within the limits of variation from wood density alone, or wood density + difference in the glue / gluing techniques being employed at the time of manufacture.
all the above is MY OPINION, YMMV you can't say you weren't warned ;-)
bob
Reply to
Bob Cowell
I run an APC 16*8 on my 120 Surpass in most applications. For that plane, I'd try a 14*8 or more likely a 16*6. You'd probably be better off with the lowest pitch prop you can get away with because that plane should be a floater.
Don't worry about the weight. Get the CG where it needs to be.
Reply to
John Alt
I have had three of these airplanes. One had an O.S. 1.20 and was underpowered. I'd be suspicious of it flying with a .91 on it.
Reply to
Jim Slaughter

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