For those who are interested, I had the dynamic prop balancing done a week or so ago. It has made a difference. Before, I would look for a sweet spot in warm up as I could really tell the difference if I just did them at say 2000rpm Vs 2250rpm. After the balancing the engine is very smooth at all revs and I noticed it much smoother in cruise too - although I didn't really notice it being rough before!

The prop was delivered static balanced. The first reading was .4in/s - which I am told is pretty average. The aim is to get it balanced to the reading is under .1in/s. We ended up at .037 in/sec so happy with that. It took about two hours by the time we wired up the sensors and go the wires and computers in to the cockpit. the tests are done at cruise revs and adjustments made via addition of weights to the spinner back plate at the position the computer tells you to add them. All in all a very good investment I think.

I wish I could balance the 26"ABW's too as they give a noticeable 'wobble' on take off and before I can hit the brakes!

cheers

ross