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HomeRC & PowerAircraftHelicopterRadio - Futaba FASST › BLS255 Brass Gear Stripped in Flight
04-11-2014 02:19 AM  4 years agoPost 1
bobc1

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Southern California

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157 flights on a BLS255 in an X50 nitro, no crashes/abuse.

Heli began acting erratically, inputs were delayed, I was lucky to land without a crash.

This is what I found on the aileron servo. The plastic gear that meshes with the stripped brass gear is OK, no obvious wear.

Has anyone seen anything similar? The brass gear shaft bosses look good, no elongation, the servo cannot be assembled without the gear shaft engaging both bosses correctly.

I got a free heli but am concerned about just replacing the gears and flying again.

Any ideas/suggestions as to the cause?

Thanks,
Bob

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04-11-2014 03:35 AM  4 years agoPost 2
JEEPWORLD2002/2

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Blue Bell, Pa

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Is there any binding in the servo ?? I even talking in the extreme ends ?? Which Heli is it & does it use a dual link control ??

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04-11-2014 04:01 AM  4 years agoPost 3
bobc1

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Southern California

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Is there any binding in the servo ?? NO.
even talking in the extreme ends ?? NO.
Which Heli is it & does it use a dual link control ?? X50 FBL as stated and YES.

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04-11-2014 04:25 AM  4 years agoPost 4
JEEPWORLD2002/2

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Blue Bell, Pa

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I am gonna lean on the side of hangar rash and maybe one or two passes for you flight check and it may have started getting stiffer or slipping and today the gear wore enough to skip. Do you carry ur Heli around by ur blade or the head button ?? When the last time you went in to clean n Lube and inspect ??

2nd route again the control bel crank bearing supported ?? Do you remove and inspect the radial bearing for grit or resistance ?? Some say those bearing do spin at speed so they can b little but under load may cause servo strain ?? Prob not but worth a look ?? Have u inspected the other ccpm servo gears ??

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04-11-2014 04:28 AM  4 years agoPost 5
bobc1

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Southern California

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Yeah, that's probably it.

In the past 12 years of flying, I have never had a similar problem.

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04-11-2014 04:32 AM  4 years agoPost 6
JEEPWORLD2002/2

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Blue Bell, Pa

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Edit

Trex600n,Trex500,MR25,MikadoLoGo5003d/KDE,Goblin 380XNova,CastleCreations,Ys,JR XG8,Tags Mini XBus Dmss//FAA# FA3NYC9TAP

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04-11-2014 04:02 PM  4 years agoPost 7
bobc1

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Southern California

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Maybe I should have been clearer regarding my question. I have never seen a brass gear strip when meshed with a plastic gear. Also, even in a crash, the intermediate gear is not the one that is damaged.

I am going to inspect the other cyclic servos.

At this point, I suspect a bad part/metallurgy.

I will report what I learn, if anything else.

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04-11-2014 04:57 PM  4 years agoPost 8
JEEPWORLD2002/2

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Blue Bell, Pa

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dont know what kind of plastic its is ?? but brass is very soft. i am thinking just like you, the abs would wear vs the metal gear but again brass is soft and it maybe its designed to b the one to wear ?? i would keep an eye either way inspect all three and lube clean.

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04-11-2014 06:00 PM  4 years agoPost 9
steve9534

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yakima, wa.

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Brass gear wear
I had some Futaba 9450 servos that all wore out in the same fashion. i think I had 5 or 6 total, and the brass gears would wear out while the plastic gears they meshed with would be fine. The plastic is not as strong and will break in a crash, but the brass is soft and will wear preferentially. Unfortunately, the gear sets were very expensive and I just wrote off the servos. I've still got a couple of them sitting around in a drawer. Anyway, the short answer to the question is: yes I have seen this, and no: there's really not a thing you can do about it except replace the gears and/or servos. Hope this helps. steve.

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04-11-2014 06:22 PM  4 years agoPost 10
bobc1

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Southern California

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Wow! I have run 451's for over 400 flights on my G4 with no problems other than some gear slop that is not noticeable during flight.

I will disassemble the 255's and report back my findings.

Thanks for the info.

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04-12-2014 12:36 AM  4 years agoPost 11
bobc1

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Southern California

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I inspected the other two 255 cyclic servos and did not find any unusually worn gear teeth.

You can see how worn the teeth next to the three missing teeth are. Note the sharp edges on the adjacent worn teeth.

I don't get it. Even in a crash, that would not be the gear that breaks. Also, what's up with the wear?

This one was brand new from Futaba with 157 flights in the X50. Never crashed.

Weird.

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04-12-2014 01:03 AM  4 years agoPost 12
JEEPWORLD2002/2

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Blue Bell, Pa

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Humm tough one ?? Still sticking with hangar rash

Trex600n,Trex500,MR25,MikadoLoGo5003d/KDE,Goblin 380XNova,CastleCreations,Ys,JR XG8,Tags Mini XBus Dmss//FAA# FA3NYC9TAP

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04-12-2014 02:10 AM  4 years agoPost 13
dchekas

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Farmington, CT

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FYI:

You can order the individual gears from Hobby Services rather than the whole set if you prefer.

The BLS255HV second gear (The brass one) is HSP79691, same as BLS451.

Team Align, Team Futaba, Team Byron Fuels, Team Thunder Power

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