Model Boat Mayhem
Technical, Techniques, Hints, and Tips => Radio Equipment => Topic started by: Roger in France on October 05, 2006, 08:12:31 am
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The last thread on servos threw up much of interest, so let us try this one.....
What experience/comparison can people make between servos with metal or nylon gears?
Roger in France.
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Nylon gears for general use without to much load will perform perfectly for many years, the metal geared servo should give a more precise return to neutral and will take much bigger loads consistently, also they are less prone to stripping if given a sudden impact, so metal digital is the best you can get...
Roy
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Ball bearinged servos will take more load smoothly and not wear as quickly as the bushed servos.
But saying that I have not worn out a servo yet, and usually use the cheap Futaba, Nylon Gears and bushed?
Bob
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On most model boats, the servos wont be under much stress (not talking sailwinches here!). So, I think nylon \ plastic gears would stand the test especially if from the likes of futaba.
Metal geared servos are really only for high stress such as heli's or other big model planes.
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Metal gears are stronger than plastic and won't strip like plastic, but they wear out quicker (plastic to plastic gives less wear than metal to metal). There is no other differance.
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Hitec supply some of their servos with 'Karbonite' gears. These are resin and carbon composite gears. Stronger than nylon, but wear much better than metal.
Andy
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The only real problem with plastic type servos is if you happen to bump the rudder for instance as you either put the model in the water or back in it's cradle you may strip the plastic gear
Roy
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To prevent the gear stripping problem you can always do what the model railway lads do for point control and put an omega (Ω shaped) loop in the linkage. This should be stiff enough to give rigid control, but weak enough to absorb shocks coming from the rudder end. Any model big enough to have a rudde big and stong enough to pass the kind of force along to damage a servo has enough room to do this.