ORIGINAL: cmoulder
Weather is awful today for flying, so I decided to tweak the G20 and try out the 15x7 prop. I ran it in some more with a full tank run, tweaking the high and low needles near the end, then putting about 1/3 tank in it to test the props.
No thrust numbers, but suffice to say that either prop will yank this plane around with no problem. I can see how this plane could be easily flown with a glow .61.
Once it sounded right to the ear - and checking the throttle-up, idle and midrange response, and checking exhaust residue - I used the tachometer and an infrared thermometer to see what was going on.
With the 15x6, rpm was 9870 and temp was 286 deg F.
With the 15x7, rpm was 9400 and temp was 264 deg F.
Just wish I had brought more props to check!
Are these numbers what I should be expecting? Would a higher pitched prop be better?
I finally got a chance to fire my G20 up. It turned 8600 with an 18 x 6 APC prop. I'm at 600 feet ASL, temp was 39 degrees, carb was tuned about 200 rpm below max, muffler was stock.