brett s
Gold Supporter
- Joined
- May 29, 2004
- Messages
- 2,386
- Location
- Ball Ground, GA
- Aircraft
- none currently
- Total Flight Time
- 1300 helicopter
Jazzenjohn said:The biggest r/c brushless motors are near the minimum size needed for a prerotator based on the very few posts of what people are using now. The plusses are that they are light weight, efficient, and compact. The minuses are that the big ones usually run at much higher voltages than typical gyro electrical systems, they are expensive, and they don't like to pull from a dead stop or slow speeds.
Lithium batteries are definately up and coming. They have a high power to weight capacity, but they recharge slowly (at this time) and, if done incorrectly, are suseptable to start on fire. They WOULD NOT hook up to any 12v alternator and charge up safely. They require special circuitry to charge safely.
All very true - you'll be running 30+ volts at those power levels. You're looking at around an hour to charge the batteries, and on a dedicated LiPo charger off the aircraft. The hard core aerobatic guys are usually getting 10+ minutes of flight time per charge, should let you get several starts anyways.
Seems like it might be worth pursuing for the ultralight crowd, may let you stay within the weight limits where nothing else would.