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-   -   Dynamic Prop balancing (http://www.vansairforce.com/community/showthread.php?t=174236)

Keldog 08-13-2019 08:51 AM

Dynamic Prop balancing
 
Anyone have a line on Dynamic Prop balancing in the Northern California/Sacramento area?

jrtens 08-13-2019 09:18 AM

Try Rainbow.

https://rainbowaviation.com/

randylervold 08-14-2019 06:50 AM

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?

Walt 08-14-2019 07:05 AM

Drill holes and add weights to the spinner bulkhead.

randylervold 08-14-2019 07:31 AM

Quote:

Originally Posted by Walt (Post 1366480)
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?

Walt 08-14-2019 07:39 AM

Quote:

Originally Posted by randylervold (Post 1366493)
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.

jask 08-14-2019 08:55 AM

Quote:

Originally Posted by Walt (Post 1366497)
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.

rongawer 08-14-2019 08:57 AM

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.

Walt 08-14-2019 08:58 AM

Quote:

Originally Posted by jask (Post 1366514)
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.

Walt 08-14-2019 09:05 AM

Quote:

Originally Posted by rongawer (Post 1366516)
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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