ORIGINAL: flyncajun
MIKE !!
I have a deverter you can have.
shoot me a e-mail
I`m sure Ola is aware of most things discussed
he has been around for a long time and flys International events
Here is one thing I learned from Earl Haury
Expanded foam in the Spinner will get rid of the Bell Effect ring, it works
and the most important thing is, the Nose ring .
Experimenting with nose ring/limiters will give you different noises. and levels of noise
I might add if you have to adjust the Motor at all with the nose ring IE force it to fit the Fuse
from firewall missalighnments
you will have motor transfer noises at different rpms mostly mids and highs
more so with composite airplanes.
Apc has a 18+11 med. width blade that they made for a while But no longer distribute
I have a few of these the one inch pich more is a bunch quieter
we might be able to twist there arms alittle to redistribute them
I also have extended and modified many Apc Props with good results pitch , widths and extensions ,
just don`t strike the ground because the tips are more flagile than the rest of the prop
hope this helps
Bryan
I agree with Bryan....the current trend to 10 inch pitch isn't doing us much of a favor in the noise department. The 18.1x10 is quite noisy on step even with a 140 RX up front. An 11" or even 12" pitch will help reduce noise substantially.
Ola, you may want to twist the 18.1x10 to a bit higher pitch. Dave Lockhart has written a straight forward detail regarding twisting the 3 blades, and as resourceful as you are you can do the same on the 2 blade, I am sure. Or contact Dave
Bryan, I'd love to get my hands on an 18x11. The 18.1x10 isn't nearly enough load for the Webra. I've extended one to 19x10 with better results but it's still noisy and clearance is more of an issue on my grass field. Haven't gotten around to twisting one yet but that's probably next.
On the nose ring misallignment concern...folks may want to try making a nose ring completely from rubber sheet. I use 3/16" polyurethane from McMaster Carr.
Matt Kebabjian