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  #1  
Old 08-13-2019, 08:51 AM
Keldog Keldog is offline
 
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Default Dynamic Prop balancing

Anyone have a line on Dynamic Prop balancing in the Northern California/Sacramento area?
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  #2  
Old 08-13-2019, 09:18 AM
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jrtens jrtens is offline
 
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Try Rainbow.

https://rainbowaviation.com/
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  #3  
Old 08-14-2019, 06:50 AM
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randylervold randylervold is offline
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I’m familiar with balancing Lycomings, can anyone advise the procedure for a Rotax? There is no starter ring (aka “flywheel”) to attach the weights to, where are the weights normally installed?
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  #4  
Old 08-14-2019, 07:05 AM
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Walt Walt is offline
 
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Drill holes and add weights to the spinner bulkhead.
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Walt Aronow, DFW, TX (52F)

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
Authorized Garmin G3X Dealer/Installer
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  #5  
Old 08-14-2019, 07:31 AM
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randylervold randylervold is offline
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Quote:
Originally Posted by Walt View Post
Drill holes and add weights to the spinner bulkhead.
Hmm, would it make sense to drill a series of evenly spaced holes near the perimeter in during construction to provide for this? Maybe Van's should add this to their design?
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  #6  
Old 08-14-2019, 07:39 AM
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Walt Walt is offline
 
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Quote:
Originally Posted by randylervold View Post
Hmm, would it make sense to drill a series of evenly spaced holes near the perimeter in during construction to provide for this? Maybe Van's should add this to their design?
Turbines do that but you would need to account for the loss of material as most of the holes would remain empty.
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Walt Aronow, DFW, TX (52F)

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
Authorized Garmin G3X Dealer/Installer
RV7A built 2004, 1700+ hrs, New Titan IO-370, Bendix Mags
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  #7  
Old 08-14-2019, 08:55 AM
jask jask is offline
 
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Quote:
Originally Posted by Walt View Post
Turbines do that but you would need to account for the loss of material as most of the holes would remain empty.

As long as the holes are symeterical, it should make zero dfference.
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  #8  
Old 08-14-2019, 08:57 AM
rongawer rongawer is offline
 
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I actually prefer drilling them myself. Using pre-drilled holes often requires splitting weights, whereas drilling the hole allows precise location of a single weight.

Use a #13 drill, and then a 3/16" ream to ensure a close tolerance fit for an AN3 bolt. Works well.
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  #9  
Old 08-14-2019, 08:58 AM
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Walt Walt is offline
 
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Quote:
Originally Posted by jask View Post
As long as the holes are symeterical, it should make zero dfference.
I was referring to the loss of material from a strength/structural stand point.
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Walt Aronow, DFW, TX (52F)

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
Authorized Garmin G3X Dealer/Installer
RV7A built 2004, 1700+ hrs, New Titan IO-370, Bendix Mags
Website: ExpAircraft.com, Email: walt@expaircraft.com, Cell: 972-746-5154
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  #10  
Old 08-14-2019, 09:05 AM
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Walt Walt is offline
 
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Quote:
Originally Posted by rongawer View Post
I actually prefer drilling them myself. Using pre-drilled holes often requires splitting weights, whereas drilling the hole allows precise location of a single weight.

Use a #13 drill, and then a 3/16" ream to ensure a close tolerance fit for an AN3 bolt. Works well.
99% of the time I split weights so that you can tweak the solution, it's difficult/almost impossible to precisely nail the exact angle with a single hole. The ease of splitting weights with some machines is much easier than with some more basic units.
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Walt Aronow, DFW, TX (52F)

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
Authorized Garmin G3X Dealer/Installer
RV7A built 2004, 1700+ hrs, New Titan IO-370, Bendix Mags
Website: ExpAircraft.com, Email: walt@expaircraft.com, Cell: 972-746-5154
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