My helicopter can pretty consistently get over 1:30 with 50 winds on a 15:1 winder (750 total), and my record is 1:52.08.
The helicopter is 4 grams, and the two rotors are 40cm wide each. The rubber I use is 1/8'' thick and I usually use over 1.7 grams of it. At 50 winds, it gets to the point where it is literally a battle to get even one more turn on the handle, so we usually stop there out of fear of it snapping. How can I get more winds on it, since you guys seem to be getting 150+ more winds than I can? I do stretch out the rubber and lubricate it; what else is there to be done?
2011 regionals- 2nd solar system 7th helicopters 2nd overall; states- 5th solar system 5th helicopters 8th experimental design (ugh) 4th overall