RunRyder RC
WATCH
 1 page 831 views POST REPLY
HomeRC & Power✈️Aircraft🚁HelicopterRadio - Futaba FASST › BLS255 Brass Gear Stripped in Flight
04-11-2014 02:19 AM  5 years ago
Topic Vote0Post 1
bobc1

rrApprentice

Southern California

MyPosts All Forum Topic
BLS255 Brass Gear Stripped in Flight

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
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
04-11-2014 03:35 AM  5 years ago
JEEPWORLD2002/2

rrKey Veteran

Blue Bell, Pa

MyPosts All Forum Topic
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 ??Trex600n,Trex500,MR25,MikadoLoGo5003d/KDE,Goblin 380XNova,CastleCreations,Ys,JR XG8,Tags Mini XBus Dmss//FAA# FA3NYC9TAP
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
04-11-2014 04:01 AM  5 years ago
bobc1

rrApprentice

Southern California

MyPosts All Forum Topic
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.
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
04-11-2014 04:25 AM  5 years ago
JEEPWORLD2002/2

rrKey Veteran

Blue Bell, Pa

MyPosts All Forum Topic
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 ??
Trex600n,Trex500,MR25,MikadoLoGo5003d/KDE,Goblin 380XNova,CastleCreations,Ys,JR XG8,Tags Mini XBus Dmss//FAA# FA3NYC9TAP
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
04-11-2014 04:28 AM  5 years ago
bobc1

rrApprentice

Southern California

MyPosts All Forum Topic
Yeah, that's probably it.

In the past 12 years of flying, I have never had a similar problem.
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
04-11-2014 04:32 AM  5 years ago
JEEPWORLD2002/2

rrKey Veteran

Blue Bell, Pa

MyPosts All Forum Topic
EditTrex600n,Trex500,MR25,MikadoLoGo5003d/KDE,Goblin 380XNova,CastleCreations,Ys,JR XG8,Tags Mini XBus Dmss//FAA# FA3NYC9TAP
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
04-11-2014 04:02 PM  5 years ago
bobc1

rrApprentice

Southern California

MyPosts All Forum Topic
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.
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
04-11-2014 04:57 PM  5 years ago
JEEPWORLD2002/2

rrKey Veteran

Blue Bell, Pa

MyPosts All Forum Topic
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.Trex600n,Trex500,MR25,MikadoLoGo5003d/KDE,Goblin 380XNova,CastleCreations,Ys,JR XG8,Tags Mini XBus Dmss//FAA# FA3NYC9TAP
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
04-11-2014 06:00 PM  5 years ago
steve9534

rrKey Veteran

yakima, wa.

MyPosts All Forum Topic
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.
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
04-11-2014 06:22 PM  5 years ago
bobc1

rrApprentice

Southern California

MyPosts All Forum Topic
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.
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
04-12-2014 12:36 AM  5 years ago
bobc1

rrApprentice

Southern California

MyPosts All Forum Topic
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.
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
04-12-2014 01:03 AM  5 years ago
JEEPWORLD2002/2

rrKey Veteran

Blue Bell, Pa

MyPosts All Forum Topic
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
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
04-12-2014 02:10 AM  5 years ago
dchekas

rrKey Veteran

Farmington, CT

MyPosts All Forum Topic
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
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
WATCH
 1 page 831 views POST REPLY
HomeRC & Power✈️Aircraft🚁HelicopterRadio - Futaba FASST › BLS255 Brass Gear Stripped in Flight
 Print TOPIC  Make Suggestion 

 3  Topic Subscribe

Tuesday, September 17 - 1:16 am - Copyright © 2000-2019 RunRyder   EMAILEnable Cookies

Login Here
 New Subscriptions 
 Buddies Online