twinturbostang
Posts: 802
Joined: 8/29/2005
From: Germantown, MD, USA
Status: offline
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quote:
ORIGINAL: Matt Kirsch
Wow, quite a thread 
That LiPoly and brushless motor will turn it into a real barn-burner, that's for sure.
lol I hope it doesn't rip the wings off of it! 
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Hindsight being 20/20 and all, what you're seeing with the battery life and overall performance is pretty much exactly what I'd expect from that setup. Battery's not quite robust enough to run a 400 motor... You'd probably see better performance with the EPS300C and that battery. It's lighter and spins a larger prop at a lower RPM. With my E-starter, I was regularly getting 12 minute flights on 700mAh AAA NiMH cells because the Amp draw was much lower.
You're saying the 300C would actually outperform the 400 as well? Interesting. The AAA cells are obviously just not big enough to give the amps that the 400 motor requires. I've gotten a little better at throttle management now. Not running it WOT the whole time. And that seems to help. Battery is still pretty warm/hot after a flight. But not "scalding" hot as before.
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If you ever get the opportunity to fly in a full-scale Cessna or other small aircraft, you'll learn all about coordinated turns, using rudder and ailerons together to "keep the ball in the center." Coordinated turns are mandatory in full-scale aircraft; bank-n-yank is VERY uncomfortable for the occupants of the plane. Most models exhibit that "tail dragging" behaviour to some degree too, though scale models like the Piper Cub, and E-Starter (a semi-scale Cessna 152) exhibit it more than others. Don't worry about it; it's normal, and learning to make all your turns coordinated is a GOOD thing. Looks pretty in the air, too
I have been in full scale Cessna's before, although not in a long time. I actually got to do a take off once. Very interesting feeling. You MUST correct for torque upon full throttle by giving it a bunch of rudder (steering input). Otherwise you will run off the side of the runway! No that didn't happen. But it would have if I had not corrected for it. Back to the models... I'm learning how to do coordinated turns. I've found that high bank turns require more rudder input. But sometimes I'm not sure what to do. If I do a moderately high bank turn, the tail will drop some. For instance in a right turn, the tail drops, so I give it right rudder to bring the tail back up. But in the mean time, the plane is slipping down, loosing altitude due to the decrease in lift. That would mean I need to give left rudder to hold altitude. But that will just worsen the planes attitude/orientation in the turn. Hmm. Maybe I need to work more on coordinating bank angle with turn rate. ie: maybe more elevator input is required at that particular bank angle. I may be inadvertently doing a partial knife edge (high bank angle and low turn rate). I noticed that when I do nice gradual low bank turns, it looks a whole lot better. Much more graceful.
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All Forums >> Electric Aircraft Universe >> Electric Training >> RE: E-Starter woes. Short flight time, battery barbecue, etc. 
RE: E-Starter woes. Short flight time, battery barbe... - 
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