Electric Stunt > Gettin all AMP'ed up!
Why Not Use?
Bill Sawyer:
In most references to motors I see a trend to use the AXI 2826/10. The advertisements lists it as a 40-46 size engine replacement. In the same ad there is also a AXI 2820/10 listed with a corresponding size of a 40 engine. Is this motor being overlooked in preference to a stronger motor or is everyone looking to have the most power?
Has anyone done any experimenting with the 2820/10?
While I have your attention I have another question or two. What is needed to connect a Randy Smith spinner to one of these motors and who sells the items needed?
Mike Palko:
Bill,
I used an AXI 2820/10 on my Twister back in 2003. It was a great motor, but is only equivalent to a .32-.35 at best. Most of the ARF's being flown require a solid .40 to pull them. Not to mention many are heavy for their size because they were not intended to be electric power.
Kim Doherty:
Bill,
Just to add to what Mike has stated, electric motors do not in and of themselves posses any innate amount of power. In a way, it (electricity) is like having an unlimited boosting effect from nitro. Electric motors are simply energy conversion devices. If you have more volts (power) you can turn a bigger prop with any electric motor. If you have more amps (capacity) you can turn that same prop for a longer time. The issue with the motors is their ability to turn the incoming energy into a rotational force without burning up the windings or causing the magnets to let go from the heat. So with each step up in size of the motor-can you can accommodate more windings and larger magnets thus giving the motor the ability to convert more of the incoming energy into rotation with lower resistive losses.
For the most part the determining factor as to how much power a particular motor is capable of producing (aside from melting) is the battery. More cells in series = more volts = turn bigger prop. More cells in parallel = more mah capacity = turn prop for a longer time.
From the motor's perspective, more turns (copper windings) = turn slower with more torque. Fewer turns = turn faster with less torque. You will see motors identified as "28/26 - 12 and 28/26 - 10". The "10" can turn a given prop faster with less torque vs. the "12" which has more turns and will turn the same prop slower with more torque.
Larger motor-cans also produce more torque due to the natural gearing effect of their larger diameter.
Kim.
Bill Sawyer:
Kim,
I worked in electronics for 35 years so I understand all of that. I just wanted to know if anyone had experience with the 2820/10. I was considerint tyring one but wanted to get some comments on the motor before I wasted my money.
Bill
phil c:
--- Quote from: Bill Sawyer on January 03, 2007, 08:27:43 PM ---Kim,
I worked in electronics for 35 years so I understand all of that. I just wanted to know if anyone had experience with the 2820/10. I was considerint tyring one but wanted to get some comments on the motor before I wasted my money.
Bill
--- End quote ---
I don't have personal experience, but the the GSCB symposium a couple years ago I talked to Dean Pappas about it. Running the smaller motor at a higher power level was one thing he was thinking about. Save a couple ounces on motor weight and run higher voltage. As Mike says, the problem would be keeping the motor cool, but the couple articles Dean had in FM last year showed how to do that with ducting. You can't just hang the motor out in the breeze. In needs a cowel designed to force cooling air through it.
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