A Small Reno Pics Offering

[Dialtapper]

Re: A Small Reno Pics Offering

Prop balancing in action.
There is a transducer for vibration attached to the cord. A prop blade probably has a reflector tape on it.
There is a strobe unit and a black box. Shoot the prop with a strobe unit or some other method of motion capture to begin the process at a designated RPM.
Vibration frequency and amplitude is plotted based on degree position of the engine rotation.
Black box gives a read out and you add weight or alter existing weight to correct.
There are a few different types of equipment avail.

Chadwick and Aces. Is there another?

[FuryFan]

Re: A Small Reno Pics Offering

Thanks for the clarification 51Fixer. I figured a balancing system would use two transducers in order to get the amplitudes and force vectors (?) needed to balance. Do these systems strobe multiple times per revolution, and if so, do you know the frequency off hand. It's amazing the massive number crunching these "magic boxes" can achieve. Thanks again.

Kevin

[Propellerhead]

Re: A Small Reno Pics Offering

Here are all the other elements that 51fixer was talking about...

[Propellerhead]

Re: A Small Reno Pics Offering

And some late night balancing and dialing in of the Bear from 2009...

[xmh53wrench]

Re: A Small Reno Pics Offering

Chadwick!!! I couldn't remember that name at all, and great explanation 51fixer. We used to run about a dozen or more accelerometers all over the H-53s I worked on, drive shafts, hanger bearings, engines, rotorheads, gear boxes, ect. If you know the rpm (frequency) of a specific component or even gear, u can isolate that item. Really fine tune, and troubleshoot probs or potential probs. Both on ground and in flight. Sorry for straying....just fond memories

[Tibia]

Re: A Small Reno Pics Offering

If they are recording at 1 deg increments with an rpm of (let's say) 3000, the frequency would be 18kHz.

Bob