brush or brushless?
03-16-2007, 03:28 PM
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RE: brush or brushless?
When speaking strictly with micro helicopters, belts are generally better simply because they are more resistant. The tiny gears on gear driven tails with the micros are really fragile and not worth the trouble. Just landing in some grass is often enough to strip the tail gear.
Now, if you're talking bigger helicopters (.30 + size), then gear driven is superior in terms of power transfer and efficiency versus belt drive, as well as lasting a lot longer in terms of wear, and the gears are beefy enough that the only way you damage them is by physically crashing.
Which brings up the point that rebuilding a gear driven tail after a crash is a little more of a pain in the ass versus re-assembling a belt driven tail. In the end it comes down to what you prefer, but you'll find most of the high performance, larger helicopters will use geared tails instead of belt due to the above mentioned performance advantages.
Now, if you're talking bigger helicopters (.30 + size), then gear driven is superior in terms of power transfer and efficiency versus belt drive, as well as lasting a lot longer in terms of wear, and the gears are beefy enough that the only way you damage them is by physically crashing.
Which brings up the point that rebuilding a gear driven tail after a crash is a little more of a pain in the ass versus re-assembling a belt driven tail. In the end it comes down to what you prefer, but you'll find most of the high performance, larger helicopters will use geared tails instead of belt due to the above mentioned performance advantages.
03-18-2007, 09:40 AM
#7
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RE: brush or brushless?
Brushed engines has an efficiency of 50-60%
Brushless engines has an efficiency of 70-98% (80% is typical).
With the identical flight patterns, you will have 30 to 50% longer flight times with a brushless, than with an identically powered brushed engine.
With identical power output the Brushless engine will have a lower weight, increasing performance, specially in micro heli's.
With similar physical dimensions, you can get a Brushless engine that is at least twice the power of a brushed engine. Offering much better performance, at similar physical dimensions.
Since the brushless is brushless...
then there is no brushes to wear out, and no commulator(??) that needs to be maintained.
Most brushless engines lasts as long as their bearings.
Brushless engines has an efficiency of 70-98% (80% is typical).
With the identical flight patterns, you will have 30 to 50% longer flight times with a brushless, than with an identically powered brushed engine.
With identical power output the Brushless engine will have a lower weight, increasing performance, specially in micro heli's.
With similar physical dimensions, you can get a Brushless engine that is at least twice the power of a brushed engine. Offering much better performance, at similar physical dimensions.
Since the brushless is brushless...
then there is no brushes to wear out, and no commulator(??) that needs to be maintained.Most brushless engines lasts as long as their bearings.
