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T-REX 450 › 450 DFC - Servos never survived every crash
06-06-2014 05:51 AM  4 years agoPost 1
M100

rrNovice

Hong Kong

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I have a 450 DFC and the metal gear of 3 stock servos always stripped after every crash, even the crash is minor. The maintenance cost is high as every time I need to replace the 3 servos. Can something be done to solve this?

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06-06-2014 06:55 AM  4 years agoPost 2
AWittleWabbit

rrElite Veteran

O.C., CA

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There has been talk over the years of various ways to help this. Some of the better ones were using thin servo horns to removing some of the splines in the horn to weaken it. All that I can remember were ways of weakening the servo horn so it breaks instead of the servo gears.

I've cut notches in the horns of my 450 to test but it did not work everytime. It's difficult to tell how much strength is needed without risking an in flight failure.

I will try and find the previous post about this.

Heli-itis sufferer.

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06-06-2014 04:10 PM  4 years agoPost 3
Richardmid1

rrProfessor

Leeds, England

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Are you sure its the gears that are stripping or the shafts/pins that are bending?

Either way I would suggest trying another servo manufacturer either with metal gears or plastic, yes the plastic gears will strip but they are a lot cheaper to replace!

How quickly do you hit throttle hold when you crash? Hitting the ground under full power doesn't help!

60% of the time, it works every time!

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06-06-2014 09:52 PM  4 years agoPost 4
AWittleWabbit

rrElite Veteran

O.C., CA

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I have a 450 DFC and the metal gear of 3 stock servos always stripped after every crash
I missed this. Like Richard said, you may have better luck with different servos. Align micro servos are good for the price but I find MKS ds92a+ much more durable. They still strip gears too though, just not as much.

Heli-itis sufferer.

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06-06-2014 11:45 PM  4 years agoPost 5
AndyH

rrKey Veteran

Rockledge, FL

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It's always the small plastic sacrificial gear that goes. What I want to know is why in the heck doesn't align sell just those gears in a pack! Instead of having to buy all the metal gears which are usually allright after the crash.

This hobby is like Kryptonite to chicks!

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06-07-2014 02:15 AM  4 years agoPost 6
Jerry K

rrKey Veteran

Houston Area

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Buy the plastic gear sets and use the one gear the strips in the metal set. The metal and plastic gear sets are the same except for the material

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06-07-2014 07:38 AM  4 years agoPost 7
M100

rrNovice

Hong Kong

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Thank you for your advice. I played at downhill with a very small flat ground for landing and taking off. The heli normally crashed on the shrubs with full thorttle. I never changed my flying style and setting and same crashs always happened on my flybar 450 pro but no such issue happened. All servos were still functioned.

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06-07-2014 07:42 AM  4 years agoPost 8
M100

rrNovice

Hong Kong

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The main concern is when the gear was stripped after crash, the sevos were then binded and overheat the circuit. This always happened when i checked the crashed heli and found that the servos were very hot. The servos cannot be used even the stripped gear was replaced.

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06-07-2014 10:36 PM  4 years agoPost 9
AWittleWabbit

rrElite Veteran

O.C., CA

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The main concern is when the gear was stripped after crash, the sevos were then binded and overheat the circuit.
With FBL you must turn power off immediately after a crash. Sometimes servos jam when the gears break. The jammed servo is still trying to move a will fry in very little time.

I burnt one up not paying attention. I broke all three servo horns so I assumed the gears were OK. I didn't notice one was jammed till the bottom of the case started melting and smoking.

Heli-itis sufferer.

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