Sunday 6/29/03.

I'm happy with this bird after the day was over.
I read a post in here from some dude who was taking out the os 91 fx because he could'nt get it to idle down low enough,and had a hard time landing it because it was too fast.
Well, I've got some good news for you. I stuck with the idea of using the 91 and I'm glad I did. I broke the engine in on the airplane with the cowl off to make adjustments easy of course.
I put about a tank through it at a nice rich setting and mid range throttle. After that, I just had to lean out the low end adjustment a bit to get a good stable idle. I used a 14/6 zinger.
I was able to get a nice low idle. The plane didn't move on the ground. I'm not kidding. I know how to tune my engines to perfection. I have unlimited vertical with this prop as long as I'm not doing a vertical roll. or vertical snap roll. I'm going to try a 13/7 next to see what happens. I want to see if I can hover this bird. If anyone has the right answer for me, as to what prop to use to get it to hover, please email me. I had the engine still running a bit rich. I always run em a little rich so I must consider that. I'll see and report my findings. Other than that, it flys great, tracks great, I was able to slow it down real good for excellent landings. No problems!

The trick is, while tuning your engine, listen to your idle for at least 3 minutes. If it slows down and dies, or even if it doesn't die and just slows down a bit it will eventually bog down and die because the low end setting is too fich. If it speeds up and dies it's too lean. Spend as much time as needed to get that idle to remain at a constant rpm so it doesn't speed up or slow down.
Then recheck your main setting for max lean and always back off 1/2 a turn and let it idle and listen again for 3 minutes to make sure there is no change in idle rpm. Your transition should be good as well. If you change to a different prop, your idle will change and you will have to re adjust the low end and of course the main end for that prop. Always listen to your idle for 3 minutes and make sure there is no change in rpm. Always adjust it for a stable idle. That's how you know you've got it right.

Happy idleing.