Dynamic Prop balancing

Keldog · #1 08-13-2019, 08:51 AM

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

jrtens · #2 08-13-2019, 09:18 AM

Try Rainbow.

https://rainbowaviation.com/

randylervold · #3 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 · #4 08-14-2019, 07:05 AM

Drill holes and add weights to the spinner bulkhead.

randylervold · #5 08-14-2019, 07:31 AM

Quote:

Originally Posted by Walt

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 · #6 08-14-2019, 07:39 AM

Quote:

Originally Posted by randylervold

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 · #7 08-14-2019, 08:55 AM

Quote:

Originally Posted by Walt

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 · #8 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 · #9 08-14-2019, 08:58 AM

Quote:

Originally Posted by jask

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 · #10 08-14-2019, 09:05 AM

Quote:

Originally Posted by rongawer

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.