stunthanger.com
Engine basics => Engine set up tips => Topic started by: Allen Eshleman on February 18, 2011, 04:43:12 AM
-
Propellers come in different shapes and sizes. Recently, with some experimentation I began to get my best B-40 performance on a Smoothie with an 11-6 Top Flite Power Point prop. (which by the way, are out of stock at Tower). However, I started to think. APC's have a much wider blade. I haven't tried this yet. Here's the question.
Would a prop with a wider blade and lower pitch such as an APC 11-4 or 11-5 pull equally as well?
-
APC props generally work well or better than the same size wood props. However, they are heavy. A B-40 in a Smoothie seems to be plenty of power but watch the balance with the heavy APC!
Floyd
-
I have been using slightly worked Zinger Pro 11/4 props on a Brodak 40 on an Umland excalibur with good success. The engine runs very well with this prop and milage is excellent.
Dennis
-
Allen; When I finished my Sig Super Chipmonk (51.5 oz and a B40) I was using a Master Airscrew 11/6, and was happy with the performance. I don't remember why I decided to try an RSM 10/6, (oh yes I do, my brother gave me one) but did. A huge leap in performance. I think the 11/6 was overloading the engine; the 10/6 removed some load and allowed the B40 to give me a much better 4/2 break. Since then I've tried a Vess 10/6 and an old Top flite paddle blade 10/6. The Top flite gave very similar performance to the RSM, buyt the Vess didn't put enough load on the engine and I had to run the engine about 800 rpm faster and lost the great 4-2 break.
Brian
-
Propellers come in different shapes and sizes. Recently, with some experimentation I began to get my best B-40 performance on a Smoothie with an 11-6 Top Flite Power Point prop. (which by the way, are out of stock at Tower). However, I started to think. APC's have a much wider blade. I haven't tried this yet. Here's the question.
Would a prop with a wider blade and lower pitch such as an APC 11-4 or 11-5 pull equally as well?
Maybe this site will shed some light on the question of a wider blade, just download the PDF and plough through it!
http://www.supercoolprops.com/articles/compressibility.php
Good luck and good reading.