ORIGINAL: cmoulder
ORIGINAL: MTK
And one more; this one shows the stock wood tip and the modified, carbon covered tip. Having that much area at the tips loads the engine down unnecessarily. Much of the work is lost to tip vortex (drag) and noise
Georgeous craftsmanship!
My first one isn't going to look like that, I'm sure.
Thank you Bob,
Guys,
The 18x12 prop was run this afternoon and all I can say is wow!! This will be the prop I want to use on the SAP 180...need to get some flying time on it.
I couldn't get rpm but maybe, if Ed is up to it after the WRAMS, we can get some numbers. The engine was very happy running this one probably around 7.8-8K (by ear) on the bench. I did notice a little jump at about 1/3 throttle.
Hey Bob, BTW, I used the technique you had suggested with the Tee in the line...works great. No more problem with fuel draw. On the bench it's easy to see how the rocking motion between TDC and BDC works to draw fuel. It definitely works better than bringing the prop through, Todd was right
I cut the 18 5/8X13 down to 17 3/4 x13, by trimming the tips only. The engine turned this prop much better than before. 13" pitch is possibly a bit much but after full break in, it just might work great too. I'd place the rpm at around mid 7s but it still had some uncertainty and a little fluctuation probably getting a bit hot. Not quite ready for prime time.
Fruitful afternoon overall.
Matt