RunRyder RC
 4  Topic Subscribe
WATCH
 1 page 832 views
Scorpion Power Scorpion Power
HelicopterHIROBOOther › Engine just stops dead
09-13-2007 07:04 AM  10 years agoPost 1
wild1957

rrApprentice

Malaysia

My Posts: All  Forum  Topic

Hi Guys,

I have a bit of a problem and I hoped that some one could help with a solution. I have a 3 month old Hirobo Sceadu evolution 50 it has been running really nice until yesterday. I took it across to my flying area and when I tried to start it it wouldn't start after a bit of messing around I got it going and it sounded ok ran ok.I proceeded to hover, after about 20 secs of hovering about 2 feet from the ground the engine stopped dead and down the bird came. No damage thankfully, I went to start it again and it hovered for about 10 secs then stopped again. After this it would not start at all. I changed the plug and it started straight away no problem but after 20 or so secs of hovering it stopped and dropped again. Since that time it will start up but as soon as I remove the glow it stops. If I leave the glow in it runs why is this???
I don't know if anyone can help but this is a new problem for me and other than changing the glow plug I do not know what else to do.
Prior to this problem I fitted a battery checker, but have since removed it and have the same problem.
I fitted also a tail pipe extension of 20mm id pipe about 7 inches long it used to run with this before ok so I don't think this is a problem. Finally I changed the fuel the other day to Cool power 30% Nitro, I was using the Byron 30% Nitro before this. I even changed back to the Byron this morning to check back and still the same problem, remove the glow and engine stops.
Ideas please..

PM  EMAIL  GALLERY  Attn:RR  Quote
09-13-2007 07:19 AM  10 years agoPost 2
nivlek

rrProfessor

Norfolk England

My Posts: All  Forum  Topic

If the engine stops when the plug is removed , it sounds like the engine is too rich . Adding an exhaust extension would probably increase the muffler pressure which feeds the tank, so that could be something to do with it .
While the engine is ticking over , pinch the fuel line and see how long the engine runs . It should run for three or four seconds , then stop . If it stops almost straight away , it is a sign of being lean , if it runs for longer than four seconds , or if there is a drastic increase in rpm before the engine stops , then it is a sign of being rich .
Also , what plug where you using , and what plug are you using now ?

At the end of the day , it gets dark .

PM  EMAIL  Attn:RR  Quote
09-13-2007 08:11 AM  10 years agoPost 3
wild1957

rrApprentice

Malaysia

My Posts: All  Forum  Topic

Hi Nivlek we meet again and looks like a related topic this dam exhaust extension again. What you suggest a good starting point to be for the mixture setting? I of course am worried about the engine over heating. But now I cannot do anything because as I said it stops dead as soon as the glow is removed.

PM  EMAIL  GALLERY  Attn:RR  Quote
09-13-2007 08:35 AM  10 years agoPost 4
clive45

rrVeteran

NSW Australia

My Posts: All  Forum  Topic

??

This sort of behaviour can be caused by a rear bearing giving up the ghost. It allows metal to get on the plug and contaminates the platinum on the coil.
Just a thought

PM  EMAIL  GALLERY  Attn:RR  Quote
09-13-2007 10:07 AM  10 years agoPost 5
naked painter

rrVeteran

Mid glamorgan uk

My Posts: All  Forum  Topic

Glow plug could be dead. I have this sometimes also it may be too rich.

PM  EMAIL  Attn:RR  Quote
09-13-2007 10:08 AM  10 years agoPost 6
naked painter

rrVeteran

Mid glamorgan uk

My Posts: All  Forum  Topic

Oh, I'll just add that I get these symptons on a very hot day in the UK. I'm also about 100ft above sea level.

PM  EMAIL  Attn:RR  Quote
09-13-2007 05:34 PM  10 years agoPost 7
latesleeper

rrApprentice

OH

My Posts: All  Forum  Topic

Replace the fuel line including the clunk line. Are you running a header tank? If so, bypass it to see if that is the issue.

PM  EMAIL  GALLERY  Attn:RR  Quote
09-13-2007 06:31 PM  10 years agoPost 8
RayJayJohnsonJr

rrKey Veteran

Midwest

My Posts: All  Forum  Topic

Rear bearing going OR you used silicon gasket sealer to seal your exhaust. Either one will put out the fire.

-Mark

There, their and they're. It's really that simple.

PM  EMAIL  GALLERY  Attn:RR  Quote
09-14-2007 06:27 AM  10 years agoPost 9
dkshema

rrMaster

Cedar Rapids, IA

My Posts: All  Forum  Topic

Rear Bearing...going once, going twice....GONE.

I went through about six glow plugs trying to get my 50 SX-H started a couple of summers back. Put one in, start up, motor dies either right after removing the battery, or at about 1/4 throttle on the way up to liftoff. Did this about five more times trying to get airborne. Finally got it running, and a few days later noticed the heli was making an awful racket sitting on the ground at idle. Removed the back plate and saw marks in the crankcase at about the 5 o'clock position where the con rod was banging on the crank case.

This past summer, that same 50 suddenly died in flight with no warning. Stainless-steel races on the rear bearing -- gone.

Two things cause what you are experiencing -- rear bearing falling apart, or bits of RTV that you used to seal the muffler to crankcase joint are flaking off.

After you get done replacing the bearing, wash out the muffler thoroughly. Those bits of metal make it to the muffler, and do get sucked back in, find their way to the plug, and its instant fire out time.

-----
Dave

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

Team Heliproz

PM  EMAIL  GALLERY  Attn:RR  Quote
09-14-2007 06:51 AM  10 years agoPost 10
clive45

rrVeteran

NSW Australia

My Posts: All  Forum  Topic

??

The main cause of rear bearing failure in the OS motor is the different crank web that shields the rear bearing stopping it from getting enough oil mist. This means that the motor should be run on the rich side and not lean.

PM  EMAIL  GALLERY  Attn:RR  Quote
09-14-2007 01:05 PM  10 years agoPost 11
dkshema

rrMaster

Cedar Rapids, IA

My Posts: All  Forum  Topic

The main cause of rear bearing failure in the OS 50 has never been truly identified. There are many THEORIES, including the crank web, but NONE of the theories have been SHOWN to be the cause.

As a matter of fact, you state the web keeps the bearing from getting enough "oil mist" when most people have theorized that the web actually TRAPS EXCESS oil in the bearing, causing the balls to float, not roll in their cage.

If you took your 50 apart and LOOKED at the crank, there is a small hole in it, near the end of the large crank journal to feed oil to the rear bearing.

-----
Dave

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

Team Heliproz

PM  EMAIL  GALLERY  Attn:RR  Quote
09-26-2007 02:35 AM  10 years agoPost 12
WhiteRussian

rrApprentice

New Castle, DE

My Posts: All  Forum  Topic

I, too, have had this same problem with my O.S. .50 SX-H and have had the same advice regarding the fuel tubing and clunk. In my case, it did not resolve the issue. I've since then pulled the O.S. .50 SX-H and replaced it. Maybe I'll dissect it this winter.

Best,
Brian

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
09-26-2007 02:42 AM  10 years agoPost 13
Dolf

rrNovice

Redmond Washington​USA

My Posts: All  Forum  Topic

I had that problem, and it turned out to be a clogged fuel filter.

Dolf

PM  EMAIL  Attn:RR  Quote
09-26-2007 12:00 PM  10 years agoPost 14
ripper

rrApprentice

Maryland

My Posts: All  Forum  Topic

Check your glow for material in the coil.

PM  EMAIL  GALLERY  Attn:RR  Quote
09-26-2007 12:06 PM  10 years agoPost 15
Divot

rrVeteran

Mesa, AZ

My Posts: All  Forum  Topic

remove the glow and engine stops
You engine is way to lean.

PM  EMAIL  Attn:RR  Quote
09-26-2007 01:05 PM  10 years agoPost 16
hootowl

rrProfessor

Garnet Valley, Pa.

My Posts: All  Forum  Topic

My events occurred in this sequence.
  1. Glow plugs burning out after every other flight.
  2. Rattling noise started.
  3. Stall out after landing... would not idle
  4. Louder rattling... time to remove engine.
There were small metal slivers on top of the piston, metal shavings throughout, crank flange was broken.


Wolves don't lose sleep over the opinions of sheep

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
09-26-2007 03:06 PM  10 years agoPost 17
WhiteRussian

rrApprentice

New Castle, DE

My Posts: All  Forum  Topic

hootowl wrote:
My events occurred in this sequence.

1. Glow plugs burning out after every other flight.
2. Rattling noise started.
3. Stall out after landing... would not idle
4. Louder rattling... time to remove engine.
Yup, that's exactly what happen to me as well. I haven't opened the rear case yet but I'm willing to bet I find the same thing.

At startup the engine would run fine with good smoke. Approx 30 seconds in the air the smoke would go away, the engine would lean out and then shut down. I did replace the fuel tubing, clunk, and fuel filter. None of these solved my problem.

Best,
Brian

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
09-26-2007 10:48 PM  10 years agoPost 18
clive45

rrVeteran

NSW Australia

My Posts: All  Forum  Topic

??

Maybe contact OS and advise them of the problem. They may have a known problem that they will fix.

PM  EMAIL  GALLERY  Attn:RR  Quote
WATCH
 1 page 832 views
Scorpion Power Scorpion Power
HelicopterHIROBOOther › Engine just stops dead
 Print TOPIC  Make Suggestion 

 4  Topic Subscribe

Wednesday, November 22 - 11:20 am - Copyright © 2000-2017 RunRyder   EMAILEnable Cookies

Login Here
 New Subscriptions 
 Buddies Online