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Old 01-05-2009 | 04:09 AM
  #8  
UStik
 
Joined: Oct 2006
Posts: 1,028
Received 10 Likes on 10 Posts
From: Augsburg, GERMANY
Default RE: Electric Taurus

Well, not only an opinion, usual electric has more pull than usual glow. The first drive above spins at 10-11k rpm, the second 8-9k. These are outrunner motors, and the inrunners are often geared. The propellers are a bit bigger and have more pitch than the usual glow propellers. Prop efficiency is much better so the drive pulls more than a glow drive. Think of the long-strokes (like a Hanno) giving less hp at less than 10k rpm but still pulling better with a 12x11 prop instead of a 11x8 on a short stroke. You may use an ungeared inrunner at high rpm, but efficiency would be bad so you'd have only 3 minutes flight time. Electric is better also because the torque increases proportional to a rpm decrease.

Just use [link=http://www.drivecalc.de/]Drive Calculator[/link] to fiddle with the drive components. I'd stick to the slower-flying, longer-running drives, though. Taurus is an elegant slow-flying plane, not a rocket. A 12" prop should be no problem, 13" or even 14" should be possible on paved runways. May look weird but pulls nicely and gives good flight times. You might have to get used to the prop torque, though. But that's all just me.

And yes, I as well think the A123 cells are better than conventional LiPo. Not only charging in the plane, also very fast charging so you have more flights. And you don't lose time for safety measures. A benefit of the small cells might be that you can distribute them in the fuselage to adjust the c/g.