Hi-Tec karbonite gears - RCCanada - Canada Radio Controlled Hobby Forum
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Old 04-26-2010, 10:13 PM   #1
Ken E
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Hi-Tec karbonite gears

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Whats the scoop on Hitec's karbonite gears, good ,bad or other wise. just wondering as I'll soon be needing some new servo's for the new Sebart Sukhoi, came in the mail today. ken
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Old 04-27-2010, 06:30 AM   #2
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Re: Hi-Tec karbonite gears

There are positive and negative points on them, depending on your perspective and type of flying.

They are considerably stronger and hold their tolerance a LOT longer than nylon gears, but are not indestructible. For me, that fact is desirable as I want a sacrificial element in my smaller heli control train, (the 450's have HS-65HB's). Under high load conditions you can run metal gears, but unless there is some other element to break under overload that energy get transferred farther into the system. In your situation things may be a bit different as your control system may not take the direct brunt of an impact.

That being said I'm running all metal gear Hitecs in my T600.

p.s. If you decide to go metal gear avoid the cheapies. A lot I've looked at do not run a synthetic isolation gear between the motor and output shaft, (transfers all electrical noise) and show wear VERY quickly.
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Old 04-27-2010, 09:01 AM   #3
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Re: Hi-Tec karbonite gears

I stay away from Hitec Karbonite geared servos at all costs. My experience has been that they are far too fragile. Simple hanger rash broke a gear once. All I did was bump the control surface while unloading a plane from the truck. Another time I had one break mid flight for no apparent reason. All other non-karbonite Hitec servos have been very good...I must have at least a dozen 645's with never an issue.
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Old 04-27-2010, 09:30 AM   #4
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Re: Hi-Tec karbonite gears

I tested them on a 33% extra to see if they would hold up(test the limits)( 4x5475 real cheap servo but worked great)in the wings and 7975 on the tail 1 per elevator .they had more than enough power for any flying and were stupid fast.I was trying to get weight down as mutch as possible on this plane and was saving near 1 oz per servo over metal gears 1/2 lb total.they show no slop after 2 years of flying .but I have broken gears on hard landings .after my testing I would trust them only to 50cc and under,seems the only way I could break them was with a hard hit but the same hit would have no affect on a metal gear. I love these servos ,quiet /tight gears /light weight/dont wear quickly/just wish they would make them a little stronger so I could use them in bigger planes.but I would have not problem at all putting them in a 50cc.Roger
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