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  #1  
Old 06-07-2017, 12:56 PM
bernsbm bernsbm is offline
 
Join Date: Nov 2015
Location: Mequon, WI
Posts: 16
Default Dynamic prop balance

Hi All,
I'm looking for a shop in the southeast Wisconsin/northern Illinois area that can do quality dynamic prop balancing, preferably with Rotax experience. Any/all suggestions appreciated.
Barry
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N12BB RV12 flying since Oct 2016
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  #2  
Old 06-07-2017, 03:36 PM
springer springer is offline
 
Join Date: May 2012
Location: AZ/MN
Posts: 250
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Quote:
Originally Posted by bernsbm View Post
Hi All,
I'm looking for a shop in the southeast Wisconsin/northern Illinois area that can do quality dynamic prop balancing, preferably with Rotax experience. Any/all suggestions appreciated.
Barry
Not SE WI but at the Cumberland Airport, WI the Cirrus dealer does it. I have not used them.

http://www.aviationvibes.com/vibrati...nd-mitigation/
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RV-4 '88-'09 Built & Sold
RV-8 Purchased
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  #3  
Old 06-07-2017, 07:15 PM
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Piper J3 Piper J3 is online now
 
Join Date: Nov 2014
Location: Hinckley, Ohio
Posts: 595
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I'm curious... why do you feel the need to balance your prop? I set the pitch on my blades with Van's sheetmetal gage and I'm very pleased with the flight performance and engine/prop smoothness especially at cruise RPM.
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Jim Stricker
Hinckley, Ohio
PPL - 1970
80 hrs Flying Aeronca Chief 11AC
1130 hrs Flying 46 Piper J-3 Cub
RV-12 E-LSA #120058 AWC 7/12 Bought Flying 10/2015 with 48TT - Hobbs now 244
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  #4  
Old 06-07-2017, 07:24 PM
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Walt Walt is offline
 
Join Date: Aug 2005
Location: Dallas/Ft Worth, TX
Posts: 4,285
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I have balanced quite a few 12's and every one benefited significantly. It is also a recommended procedure by both Rotax and Sensenich.
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Walt Aronow, Dallas, TX (52F) RV7A, IO360, C/S, 1500+hrs

EXP Aircraft Services LLC
Specializing in RV Condition Inspections, Maintenance, Avionics Upgrades
Dynamic Prop Balancing, Pitot-Static Altmeter/Transponder Certification
FAA Certified Repair Station, AP/IA/FCC GROL, EAA Technical Counselor
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Website: ExpAircraft.com, Email: walt@expaircraft.com, Cell: 972-746-5154
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  #5  
Old 06-07-2017, 09:59 PM
12vaitor 12vaitor is offline
 
Join Date: Aug 2012
Location: Panama City, FL
Posts: 99
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Just finished balancing mine this weekend. Started out at 0.21 ips, was very happy with the final result after adding 11 grams of weight.


John Salak
RV-12 N896HS
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  #6  
Old 06-07-2017, 10:07 PM
Slane Slane is offline
 
Join Date: May 2008
Location: Hillsboro, OR
Posts: 149
Default Prop balance

Where and how did you attach the weight?
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Hillsboro, OR
RV12 Completed & Flying 2013
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  #7  
Old 06-07-2017, 10:17 PM
Driftdown Driftdown is online now
 
Join Date: Jan 2011
Location: Clearwater, Florida
Posts: 257
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Quote:
Originally Posted by Slane View Post
Where and how did you attach the weight?
x2 . . . . . .
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  #8  
Old 06-07-2017, 10:45 PM
Mark C. Mark C. is offline
 
Join Date: Nov 2009
Location: Schaumburg
Posts: 111
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Call Poplar Grove Airport, IL they have a guy that balances props. About $250. Mark C.
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  #9  
Old 06-08-2017, 12:15 PM
12vaitor 12vaitor is offline
 
Join Date: Aug 2012
Location: Panama City, FL
Posts: 99
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Quote:
Originally Posted by Slane View Post
Where and how did you attach the weight?
I started out by adding weights (washers) under the spinner attachment screws at the clocking angle indicated by the DynaVibe display. Took four runs to get the ips down to 0.01-0.02. I used a precision scale to weigh the washers and converted the inch/gram value based on the spinner screw hole location to the spinner plate location I drilled (radius decrease by 1/2" so weight value increased). I added a #8 screw with two nuts and a spacer weight at the new hole in the spinner backing plate. The total weight of the screw, nuts, washers, and spacer weight were 11g. I was fortunate that the clocking angle was almost exactly on a spinner attachment screw.

The factory listed weight difference between the two Sensenich blades is 6 grams (1204g and 1198g), so the weight location is actually near the root of the lighter blade. Not sure how that compares with other RV-12s, but it may be an indicator of the improvement you can expect from dynamic balancing.

John Salak
RV-12 N896HS
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