Prop Extension

Richard · #1 01-08-05, 05:54 PM

Since we will have our electric props STC'd here pretty soon. I was thinking of adding a change and needed some feedback on it. Since we don't need any oil, I was thinking of adding a 3-6" prop extension on the rear motor?

hharney · #2 01-09-05, 10:07 PM

ARE YOU REFERRING TO THE BLADES?
DIAMETER?

Richard · #3 01-09-05, 10:34 PM

Prop hub. Extending the prop away from the flange 3 to 6 inches. Getting the prop away from the wash coming off the fuselage.

337G · #4 01-10-05, 10:44 AM

how does extending the prop away from the fuselage improve things?

Jim Rainer · #5 01-10-05, 11:45 AM

Good question. I believe the rear engine climbs better than the front because the air coming over the cabin and rear engine stays attached, therefore less wash and turbulence??

Jim Rainer · #6 01-10-05, 11:47 AM

Also, if you are about to complete your STC, you'd have to include the prop extension (and probably do some extensive testing??)

Guy Paris · #7 01-10-05, 03:41 PM

If I remember correctly, the rear is more efficient because it does not have to contend with the air compressing against the cowl as the front engine does.. guy

Richard · #8 01-10-05, 06:04 PM

Yep, we would have another 3 months of testing. I'd rather do it all in one step then having to start from scratch. (new STC for the extension). If it would offer a great benefit then we will start testing again. If not, then we will continue on the current path.

hharney · #9 01-10-05, 10:29 PM

WITH THE MT PROPS THAT I HAVE THERE IS A PROP EXTENSION ON THE REAR. I AM NOT SURE THE EXACT LENGTH BUT I WOULD SAY IT IS ABOUT 3 - 4 INCHES. I WAS NOT QUITE CLEAR ON WHY IT WAS THERE WHEN THE PROPS WERE INSTALLED BUT I WILL QUESTION MT AND REPORT THEIR REASON.