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Mini SL motor problem

Old 04-13-2007, 01:05 PM
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ZeekWatson
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Default Mini SL motor problem

Just bought a Mini SL and noticed a problem before the first flight. The motors take 3-5 seconds to start turning when throttle is applied. The motors have a very firm "stepping" to them and when throttle is applied they actually start vibrating the props back and forth until they overcome the "stepping" and actually start turning. Anyone else notice this?

Right now I'm trying to break in the motors with a few cycles to see if it makes it go away.
Old 04-13-2007, 04:39 PM
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micro_builder
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Default RE: Mini SL motor problem

the stepping you mentioned is also called cogging. it is caused by the magnets inside the can, these particular motors have a very strong cogging, most other N20 size motors turn much easier. strong cogging/magnets means good power though, and these motors must put out some serioues thrust, they also suck up a lot of power.

the stock cell is a 300mah, not sure of the capacity, but at the end of the flight, the lipo is just starting to get warm to the touch. assuming its a 10C cell, that means each motor is pulling 1.5A, which is on par with the N20ULV and equivilant prop...20+ grams of thrust per motor is quite likely (40 grams of thrust total could really haul some weight around!).

the cogging wont really go away though, unless the motors get really hot a number of times and they lose their magnatism. this would take forever though. the 3-5 second delay is built into the RX, its a safety precaution so the RX doesnt burn out due to too much power being pulled at once - too bad the AAs dont have this, it could have saved a lot of their RXs.

nick
Old 04-14-2007, 12:18 PM
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ZeekWatson
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Default RE: Mini SL motor problem

ORIGINAL: micro_builder

the stepping you mentioned is also called cogging. it is caused by the magnets inside the can, these particular motors have a very strong cogging, most other N20 size motors turn much easier. strong cogging/magnets means good power though, and these motors must put out some serioues thrust, they also suck up a lot of power.
Yup, the Mini has a lot of power. Cogging seems to be the proper way to define the motor condition. The Mini sounds just like the big SL.

the cogging wont really go away though, unless the motors get really hot a number of times and they lose their magnatism. this would take forever though. the 3-5 second delay is built into the RX, its a safety precaution so the RX doesnt burn out due to too much power being pulled at once - too bad the AAs dont have this, it could have saved a lot of their RXs.
While this delay may be good for the RX life, it isn't good for flyability. Increasing the throttle needs to be done 3 seconds in advance so you need to seriously anticipate your flying. But to make things difficult the throttle slows down right away. Overall what this means is that the Mini is not a precision flyer. It needs just as much room as the big SL not because its less maneuverable, but because the controls are somewhat clumsy.

All that power makes the Mini fun to fly though! Its like a muscle car ... overpowered. Its also very tough, the clumsy controls lead to hard crashes. I'm looking forward to someone hacking the RX to get rid of the throttle latency though. (crosses fingers)
Old 04-14-2007, 11:36 PM
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Default RE: Mini SL motor problem

The throttle delay only happens when the throttle is first applied, but not after. Only if you pull the throttle all the way off should there be a delay in throttling back up again. if you maintain a small amount of throttle the delay should be vary minimal.

This can help you preform certain stunts however. For instance, while flying at altitude, it you hold the steering full over , then pull the throttle all the way off, then back to full, while still holding over on the steering, the one motor keeps going and the other one stops. Because of the delay, the one motor goes to full throttle right away while the other one has the delay to get up to speed. This will make the Mini Sl do a complete roll very quickly[8D]
Old 04-19-2007, 01:28 AM
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ZeekWatson
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Default RE: Mini SL motor problem

ORIGINAL: UAV Pilot

The throttle delay only happens when the throttle is first applied, but not after. Only if you pull the throttle all the way off should there be a delay in throttling back up again. if you maintain a small amount of throttle the delay should be vary minimal.
This is true. However the "turn without throttle" feature that everyone is excited about suffers from the delay which significantly reduces its effectiveness. Maybe a TX mod that prevents the throttle from going "off" so you don't have to worry about the delay? (needs a about to crash emergency off though)

ORIGINAL: UAV Pilot

This can help you preform certain stunts however. For instance, while flying at altitude, it you hold the steering full over , then pull the throttle all the way off, then back to full, while still holding over on the steering, the one motor keeps going and the other one stops. Because of the delay, the one motor goes to full throttle right away while the other one has the delay to get up to speed. This will make the Mini Sl do a complete roll very quickly[8D]
This seems to be the Mini's forte -- I'm amazed at how quickly my Mini flips over and dives! Actually my Mini has another Forte, it likes getting stuck high up in trees. [:-]

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