pretty much last minute for me, because we leave for states on friday:
we got our thinner rubber (.083) and it works MUCH better than our thicker rubber- the plane doesn't shoot up to the ceiling immediately any more. still, we think it may be rising a bit too fast. it might not be a problem at states...
in our <30 ft high multipurpose room (not counting the lights), our plane consistently flies 1:20 at around 900 winds (the rubber could go further, but we don't trust testing it on such high winds because it would hit the ceiling). we think it could get (in the same multipurpose room) something like 1:45 at least, if it weren't always hitting the lights/walls and dropping. on one of our best flights, it went about 1:25 altogether, rising about 5 feet per full turn (diameter of 7 or 8 meters), managed to fly over the lights, leveled off about a foot before it hit the ceiling, and then slowly came down with 100-ish turns left.
on 1300 winds, no obstructions, and a really high ceiling, is a plane like this capable of flying over 2:30? i think it could, if trimmed the day before at U of I.
You sir desperately need a torque meter. That rubber should do 1500 turns or more. And if you wind to that and back off enough you can stay out of the rafters and still have way more than 900 turns. But to do that consistently you need to wind to torque, not turns.
Someone asked about torque meter wire. Go to http://www.indoorduration.com/TorqueMeterCalc.asp
for a utility which calculates torque vs degrees rotation vs wire thickness vs wire length. I found a meter with a range of 0 to 1 in-oz for 360 degrees to be about right for Wright Stuff. From the calculator thats around 6 inches for 0.015 wire torque element. 0 to 2 in-oz is better for motors on the thick side (say .100 inch wide or so) as they break around 1.2 to 1.5 in oz, but those motors are really a little large for SO if your plane is at 7.0 gm. About a 9 inch 0.020 wire is good for that range meter.
In the mean time, you can simulate by winding
past say 1500 and backing off to 1200 and see if you stay out of the ceiling, but fly longer.
Or carefully repitch the prop slightly higher. Or depitch your larger prop a little.