pgoelz
Senior Heliman
Location: Rochester MI
| Addendum:
When the first rotor failed this spring, I replaced it with a new rotor that I purchased. After I replaced it, OS eventually sent me a new complete carb, which I put on the shelf because I was flying the original carb with the replaced rotor.
When the second rotor failed I put the original TT .36PRO back in and tried flying with it. Unsuccessfully. The TT is just too temperamental and I could not find a mixture setting that allowed it to spool up without dying without being FAR too lean.
So I decided to pull the TT and put the OS back in so I could at least fly a little in the coming weeks. While the engine was out, I installed the carb that OS sent me and discovered that the guide pin no longer has a washer under the head. The original has a washer that causes the pin to sit farther out. The replacement does not. This might reduce the wear somewhat but it is not the real answer.
I will be installing a weak return spring to keep everything biased in one direction.... and it just occurred to me that I could replace the metal pushrod with plastic or even carbon to lighten it up and change any resonant frequency..... maybe that will help. But the fact remains that aluminum is simply not the most ideal material for the rotor.
UPDATE: I have replaced the original metal pushrod with a CF pushrod and small nylon clevises. The mass is much lower and hopefully if this is a resonance issue, that will solve it. Time will tell.
I still have not heard from OS.
Paul
Paul Goelz
Rochester MI USA
http://www.pgoelz.com |
