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Re: Dynamic Propeller Balancing
Posted: Fri Mar 23, 2018 7:48 pm
by Bruce Fenstermacher
Tom, you blew your cover.
Re: Dynamic Propeller Balancing
Posted: Sat May 09, 2020 2:48 pm
by bgiesbrecht
Thread resurrection!
I just did this yesterday. Dynamic balance with a full spectrum analysis. I had meaningful vibration and my flying buddies were all getting their props balanced with amazing results.
My starting IPS was 1.5!
The first washer placement brought it down to 0.8 and what a difference. After some back and forth we got it down to about 0.4. I can’t believe the difference felt. Worth every penny.
The spectrum analysis indicated about 0.4 from the middle, so something slightly amiss with a plug, etc. Will be checking those this weekend...but I can barely feel it.
If you have any vibration at all, highly highly recommend doing this.
Re: Dynamic Propeller Balancing
Posted: Sat May 09, 2020 7:59 pm
by canav8
bgiesbrecht wrote:Thread resurrection!
I just did this yesterday. Dynamic balance with a full spectrum analysis. I had meaningful vibration and my flying buddies were all getting their props balanced with amazing results.
My starting IPS was 1.5!
The first washer placement brought it down to 0.8 and what a difference. After some back and forth we got it down to about 0.4. I can’t believe the difference felt. Worth every penny.
The spectrum analysis indicated about 0.4 from the middle, so something slightly amiss with a plug, etc. Will be checking those this weekend...but I can barely feel it.
If you have any vibration at all, highly highly recommend doing this.
I hope you meant 0.04 IPS. 0.4 IPS is still high. Most guys can get it down to 0.07 with not to much trouble if they have experience. I guarantee 0.07 if the prop can be balanced. I have had 2 props that I could not balance. One was because the owner had a cracked #4 cylinder and the other one was a prop that had a bent blade on a Howard. The owner finally admitted he bumped into his prop when parking his RV camper in the hangar. The hardest prop balance I ever did was an Italian 4 blade composite on a Suburu Legacy 6 cylinder. It took all day but I got it down to 0.02 IPS. I have never been able to balance one to 0.0 IPS yet. About 40 props now. Also I am finding that insurance is now requiring Dynamic prop balancing on claims.....YMMV Doug