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01-30-2012 04:55 AM  6 years agoPost 1
eppler

rrApprentice

Baytown, TX

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Going to upgrade my cyclic servos on my G20 and not sure to get Futaba coreless or brushless or what the differences are between them I do not fly 3D so don’t need lighting fast

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01-30-2012 03:28 PM  6 years agoPost 2
RM3

rrElite Veteran

Killeen, Texas - USA

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well it really depends on what you have on it right now and where you plan on goning woith it in the furture IMO.

Both servos are actually "brushless" BTW. just one is faster and somtimes weighs a bit less...

The coreless normally have a faster "reaction speed" to directional change, this is why many of the high end tail servos will be coreless. All this means is that the rotating part of the motor has no solid core, rather its made entirely out of the wire wound on itself and bonded together (epoxy, plastic). it does not have to deal with accellerating a heavier metal core.

The brushless are just that, they have no electrical connection to the rotating part of the motor. its all done inductively. So these motors will not generate nearly as much electrical noise(like those with the typical DC motors like older design servos). These motors are just minatureized versions of the larger Brusless motors on our electric Helis, but still have a metal "Core".

If you plan on going to flybarless, chances are that you will end up needing the fastest "reacting" servos you can comfortably afford to get the most performance from a 3 axis gyro, they will also have to generate more torque to deal with the lack of "help" they used to get from the flybar. Coreless are usually the faster of the two, but do not always generate higher torque.

I don't do any "serious" 3D with the RadikalG20, I have been using the same $37 HT HS servos from Futaba on the heli for the last two years. they are cheap and do just what I need them to do on this heli.

Be warned though, brushless and coreless servos will require more current from your RX power system. So you may end up having to upgrade your RX battery and or BEC to handle the higher power demands...

showing a preference will only get you into trouble, 90% of everything is crap...

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01-30-2012 06:18 PM  6 years agoPost 3
eppler

rrApprentice

Baytown, TX

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Thank you for your reply. My g20 is flybarless (CGY750) and right now I have Futaba S3152s in it but the plastic gears get slop in them so my main thing was getting metal gears. I was thinking of the S9255 servos and as far battery drain I get around five to six flights now on a charge. Price is not a concern but I don’t see the need pay for more than I need.

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01-30-2012 07:03 PM  6 years agoPost 4
RM3

rrElite Veteran

Killeen, Texas - USA

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Oh yeah, you definately need to upgrade those servos to get everything out of the GY750. I use the 3152s as well, their good for the standard FB setup (that I have) and low level 3D but are lacking for your high end FBL setup. You will feel a difference with the 9255s as they are are a bit faster, and will not struggle as much due to thier higher torque (more authority to move the swash). your flight time though I would guess will drop to 4-5 flights...

showing a preference will only get you into trouble, 90% of everything is crap...

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02-04-2012 12:38 AM  6 years agoPost 5
eppler

rrApprentice

Baytown, TX

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I put the s9255s in today and it is night and day difference. Not sure of the current drain yet but considering a jewel generator but I have spent a ton of money in two weeks on my heli and my wife may strangle me if I put in another 300.00 or I need to bribe her with a weekend getaway somewhere.

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