RunRyder RC
WATCH
 2 pages [ <<    <     1     ( 2 )    >    >> ] 2021 views POST REPLY
Home✈️Aircraft🚁HelicopterHelicopter Main Discussion › Broken con rod on OS 50 SX-H ... why ?
01-19-2016 04:37 PM  3 years ago
geomecc

rrKey Veteran

Long Island ,NY

MyPosts All Forum Topic
trying to crank a flooded engine by leaning the heli over towards the muffler and cranking untill it clears the hydro lock. instead of removing the glo plug and clearing the cylinder can break or weaken the con rod. it couldve even been a micro crack from manufacturing defect and over alittle time it spreads to failure.
the good thing is u got the heli down safely and no one got hurt
R I P Roman Jr. Team SKOOKUM SRW EFC
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
01-19-2016 05:05 PM  3 years ago
revmix

rrKey Veteran

NJ

MyPosts All Forum Topic
metal fatigue [weakness/stress]; sudden engine stoppage [blade strike]
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
01-19-2016 08:07 PM  3 years ago
dkshema

rrMaster

Cedar Rapids, IA

MyPosts All Forum Topic
Failed muffler bearings could also be related to defective connuter valves or an undertorqued doohickey which holds the frammis bracket in place.-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
01-19-2016 09:57 PM  3 years ago
wrongler

rrProfessor

Brewerton, New York

MyPosts All Forum Topic
^^^^Not True^^^^ LOL

The frammis bracket holds the thingamajiggy.
Bill Whittaker
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
01-20-2016 09:34 PM  3 years ago
Vaderluck

rrApprentice

Melbourne - Australia

MyPosts All Forum Topic
Thanks guys for the info.
I now realize broken con rod is a fact of life in nitro engine.
From you guys experience, how often it would happen. Because when it happens, it is expensive to replace all piston, ring, con rod, liner and maybe engine case too.
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
01-20-2016 10:14 PM  3 years ago
jschenck

rrProfessor

La Vista, NE.

MyPosts All Forum Topic
I now realize broken con rod is a fact of life in nitro engine.
No - conrod break, something didn't happen correctly - should never happen.

The most likely cause I'd bet is the flooded engine with a very strong starter. as stated in above posts
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
01-21-2016 12:54 AM  3 years ago
JuanRodriguez

rrProfessor

The Villages, Florida

MyPosts All Forum Topic
💎Sustaining Member
Thanks guys for the info.
I now realize broken con rod is a fact of life in nitro engine.
From you guys experience, how often it would happen. Because when it happens, it is expensive to replace all piston, ring, con rod, liner and maybe engine case too.
No , that is not true nor is it "common"..... there is a reason why it happened in your case.... it DOES NOT happen to most under normal circumstances.....

It has never happened to me......
Been there, done that and old enough to know better.....
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
01-21-2016 03:01 AM  3 years ago
Santiago P

rrProfessor

Dayton

MyPosts All Forum Topic
I have broken several rods, 1 50SX, 1 Enya 60X, and a couple of older OS91s.
All during a lean run, and always at the bottom end after clearly grinding out the brass bush. The Enya was combination of overspeed and lean. All had that golden brown coked look. Yuk!

The lean runs were due to different causes related to the fuel system, i.e. pressure leak, cracked tanks, check valve stuck, debri in tank which clogged the needle, etc. Fly high powered nitros for over 30 years and you may get to experienced some of this crap.

I always run my engines on the rich side, but like I said, crap happens, and sometimes when it does, it will wipe out an engine in a hurry.

Santiago
Team Minicopter - PeakAircraft.com
FUTABA.USA - Team Kontronik - Scorpion Motors-
SHARE  PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
01-21-2016 11:21 PM  3 years ago
geomecc

rrKey Veteran

Long Island ,NY

MyPosts All Forum Topic
it happened to me once. all i fly is gas and nitro. its all good thoR I P Roman Jr. Team SKOOKUM SRW EFC
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
01-22-2016 09:28 AM  3 years ago
datidun

rrElite Veteran

N Ireland

MyPosts All Forum Topic
Always thought if it was a lean run the piston would be all scored and the ring silver in colour,not the rod breaking because it was lean.
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
01-22-2016 08:16 PM  3 years ago
Four Stroker

rrElite Veteran

Atlanta

MyPosts All Forum Topic
Santiago;

I don't consider your description a "broken rod". Of course if you seize up the lower bushing it will take out the end of the rod.
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
01-22-2016 09:58 PM  3 years ago
meowguy

rrVeteran

Saco, ME

MyPosts All Forum Topic
💎Sustaining Member
trying to crank a flooded engine by leaning the heli over towards the muffler and cranking untill it clears the hydro lock. instead of removing the glo plug and clearing the cylinder can break or weaken the con rod.
I have done this too many times to count and it has never caused any issues at all. You pinch off the fuel, turn over a few times with the starter wand by hand, then put the starter to it.

The only issue you need to be careful of is fuel in the muffler causing a backfire when you do start the motor. That could blow out your muffler or blow off the muffler pressure line. So just tip the nose up when you're done and let the fuel run out before starting the motor.

You do have to think it through.
"Sweet dreams and flying machines in pieces on the ground." J. Taylor
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
01-23-2016 03:37 AM  3 years ago
artimus

rrKey Veteran

Buckley WA

MyPosts All Forum Topic
I dont know how many gallons of nitro I've poured out thru the muffler.
Your muffler bearings need to be chrome molly or the the your widget slips.
Fly Hard......Team Viagra
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
01-23-2016 11:46 AM  3 years ago
oballzz

rrNovice

lilburn ga usa

MyPosts All Forum Topic
Chrome molly muffler bearings are a must have or your widget does slip and we all know what happens after that........(it sends a signal to the flutter valve and activates the giggle switch!)Music is probably the only real magic I have encountered in my life,it's pure and it's real,it moves,it heals..TP
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
01-23-2016 12:13 PM  3 years ago
banshee rider

rrVeteran

Phoenix AZ.

MyPosts All Forum Topic
I think it was caused by a loss of symmetrical fluid in his main blades which caused an out of balance condition in the drive train ageing is manditory maturity is optional
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
01-23-2016 12:48 PM  3 years ago
1helimech

rrVeteran

NW Fla....

MyPosts All Forum Topic

Watch at YouTube

Enjoy ya'll

Good Day
I dream of a better world, A world where a chicken's crossing a road IS NOT questioned
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
01-23-2016 02:45 PM  3 years ago
kthane

rrVeteran

Pensacola

MyPosts All Forum Topic
Yes, but what is the brake rotor for? On a more serious note. It is likely the piston skirt broke first. And in all honesty sometimes these things just break.
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
01-23-2016 04:51 PM  3 years ago
ICUR1-2

rrElite Veteran

Ottawa, Ontario

MyPosts All Forum Topic
💎Sustaining Member
That video made perfect sense as to why the engine blew

the piston was installed backwards
spending time, paying attention
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
01-24-2016 03:10 AM  3 years ago
Santiago P

rrProfessor

Dayton

MyPosts All Forum Topic
I don't consider your description a "broken rod". Of course if you seize up the lower bushing it will take out the end of the rod.
Hi Four Stroker,
I was not making a direct comparison with the OP, his rod failure is freakish, and mine were a combination of wear and lack of lubrication on the lower rod bushing as you noted. I was just saying that it happens.

I had one nasty overspin on a pylon racer, a Nelson Q40, Nose over on take off, prop broke, and I took too long to hit the shut off. Next thing you see is the entire spinner w backblate shot out like a bullet when the engine stopped.
it was a sad sight...

S
Team Minicopter - PeakAircraft.com
FUTABA.USA - Team Kontronik - Scorpion Motors-
SHARE  PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
01-25-2016 08:37 AM  3 years ago
myjane

rrApprentice

new zealand

MyPosts All Forum Topic
Way to lean , was it smoking during this flight
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
WATCH
 2 pages [ <<    <     1     ( 2 )    >    >> ] 2021 views POST REPLY
Home✈️Aircraft🚁HelicopterHelicopter Main Discussion › Broken con rod on OS 50 SX-H ... why ?
 Print TOPIC  Make Suggestion 

 12  Topic Subscribe

Monday, September 23 - 7:52 am - Copyright © 2000-2019 RunRyder   EMAILEnable Cookies

Login Here
 New Subscriptions 
 Buddies Online