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HomeRC & PowerAircraftHelicopterEngines Plugs Mufflers Fuel › Can't figure out what happend with OS Hyper
04-25-2009 03:27 AM  9 years agoPost 1
aerosmith

rrApprentice

Mississippi

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Hey guys,
I'll start by tell'n ya that I'm fairly new to nitros. I'm on my 4th gallon of fuel & I use an OS 50 Hyper that I bought new. I had a successful break in thru the help of an experienced heli pilot, 60 miles away. My engine has been starting good - idling good & running good & I check temps often. I've mainly been flying in normal mode, lot of forward flying, nose in stuff. My last two flights I decided to idle up & do some simple 3D maneuvers. Every thing went great (thrilling). My last flight was yesterday afternoon & I burned two tanks of fuel in normal mode. I wanted to get one last flight of the day in idle up for some 3D practice. That really was my last flight.

The engine quit, no sputtering, no warning, just died. I new I was in trouble ! My heli was not in a good attitude for this to happen. I was in idle up mode 1, I managed to level the heli for my first forced auto. I wasn't pretty...I landed my heli, but at a faster rate of decent than I wanted. I spent most of the day today rebuilding airframe parts. All that I like now is new landing skids & a flybar. I should be ready for a test flight Monday. Now I'm (gun shy) I cant figure out what happened. Today I examined the engine & every thing looked good, even the #8 glow plug. Thats why I wanted to ask around & see if you could shed some light on my mis-hap. I don't have a governor & I'm not sure what my head speed is yet, I will be getting a tach pretty soon. The only other thing that I can think of is, that I've been doing 3D stuff in idle mode 1 - when I select idle mode 2, the engine seems to be running way too fast, that's why I'll get a tach soon. I don't want to over speed. Theres not a local flying field that I can go to for some help. I'm in a rural area so I depend on this site for research. Thanks a lot & I will make notes of your thoughts.

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04-25-2009 03:38 AM  9 years agoPost 2
Auto180_OCMA

rrApprentice

Futaba City Z (Mobara)

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Have you look at the OS Web site
http://www.towerhobbies.com/product...ines/index.html

I hope that can help you

AMA 334000

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04-25-2009 03:53 AM  9 years agoPost 3
Raffy

rrElite Veteran

Chicago, Illinois

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Have you re-started the engine?

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04-25-2009 04:09 AM  9 years agoPost 4
Quandumphone

rrApprentice

Yuma, AZ

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Well, if the engine is mechanically sound, you need the three main elements to keep it running: Air, Fuel, and Fire. Assuming air is good, you have two things to look for. Either the fuel system or the glow plug is bad. If the fuel system looks fine, then it is the glow plug. The glow plug can look good and still be bad.

Personally, I'd put a new plug in it and see if it runs or you can just try running it now as suggested above.

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04-25-2009 04:45 AM  9 years agoPost 5
dkshema

rrMaster

Cedar Rapids, IA

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Did you use anything as a seal between your muffler and your crankcase?

If you used high temperature RTV, bits can flake off, find their way to the plug, and it's instant stop for the motor. No warning, no nothing, it just stops.

If you used RTV or anything else, just clean off the two surfaces, put the muffler back on -- tight. Go fly. Land. Tighten the bolts again while things are warm. Repeat a couple of times. The muffler will stay tight till you want to take it off.

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If your muffler loosened up, you'll go lean, and could stop without warning. Fix it as above.

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If your rear bearing is starting to die, it can be flaking off bits of metal that find their way to the plug and put out the fire instantly. The rear bearing can go anytime...from first flight through your 50th gallon or more. It's a crap shoot.

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Check ALL fuel tubing between the muffler pressure nipple, inside the tank, outside the tank -- all of it for leaks or deterioration. Replace as necessary.

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Check your tank for leaks, splits, loose stopper....fix as required.

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If you dont use a fuel filter, it's time to install one. Filter the fuel out of your fuel jug, too. Clean out the main needle spray bar. You can open the carb barrel, put a piece of fuel tubing on the fuel nipple of the carb, then alternately suck/blow on the other end of the hose. If there is any obstruction, this will usually get rid of it.

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Check to make sure the head and backplate bolts are tight.

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Reset your needles to factory setting, see if that helps.

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If your fuel is old, or was not stored tightly capped, it may have absorbed water. This will make you motor totally unpredictable.

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I might think of other things to check, these ought to keep you busy.

-----
Dave

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

Team Heliproz

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04-25-2009 04:48 AM  9 years agoPost 6
duceduc

rrKey Veteran

Saitama-Ken, Japan

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There could be many reasons why the engine quit. By the pic, of looks like you had fuel left. Check your main tank fuel line and the header tank. Make sure the lines are not stuck at one spot where fuel is deprived.

Drain the fuel from a full tank. Take note that the fuel drains completely

Duc S
Do It! Do It!™
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RCK:24005615-01

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04-25-2009 04:50 AM  9 years agoPost 7
Auto180_OCMA

rrApprentice

Futaba City Z (Mobara)

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Where did you start your needle valve at
Where did you start the needle valve at, and Where is the needle valve now ?

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04-25-2009 01:18 PM  9 years agoPost 8
LONEWOLF2440

rrElite Veteran

MYRTLE BEACH S.C

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He cant need help to bad he hasnt gave any more info

MIKADO LOGO 600 TREX 550

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04-26-2009 03:42 AM  9 years agoPost 9
aerosmith

rrApprentice

Mississippi

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hey auto180
I started with settings per the manual. After two or three tanks I slowly started leaning, checking temps often. I'm now at two full turns & 4 clicks from seated closed. I hate it took so long to reply to your question, I work 12 hour swing shifts & drive round trip 80 miles. I've got a few days off till mid next week so maby I can work on my heli. I get my landing skids & flybar tomorrow. I'm planning a test flight tomorrow afternoon.

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04-26-2009 03:46 AM  9 years agoPost 10
aerosmith

rrApprentice

Mississippi

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Lonewolf ... I hope you can see

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04-26-2009 03:54 AM  9 years agoPost 11
aerosmith

rrApprentice

Mississippi

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raffy
I was able to start the engine, It cranked fine. Just like nothing ever happened.

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04-26-2009 04:14 AM  9 years agoPost 12
aerosmith

rrApprentice

Mississippi

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dkshema, Thanks for the info ! Thats quiet a list that I'll save in note pad.
I prefer not to use rtv
my muffler,head & back plate was tight(I check them between ever flight)
cant be sure on the bearing.the engine sounds fine.piston looks good
fuel lines are all in great shape
I pressurized the tank's no leaks
I use filters both on the heli & supply tank
my fuel isn't old

I have not re-set my needles to factory settings. I will
I enjoyed browsing in your gallery...Your finding rotor blade C.G.is super cool !
Big thanks to ya !!!

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04-26-2009 04:20 AM  9 years agoPost 13
aerosmith

rrApprentice

Mississippi

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quandumphone. Thank you for your thoughts. I will install a new glow plug tomorrow. I have several of them. It sure wont hurt anything.

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04-26-2009 04:24 AM  9 years agoPost 14
Auto180_OCMA

rrApprentice

Futaba City Z (Mobara)

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Hope you get it flying right
Hope youi get it right oh-btw nice cloud

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04-26-2009 04:35 AM  9 years agoPost 15
playfair

rrKey Veteran

Rochester, NY

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Since it restarted fine, and you don't use rtf, is there a chance you got a lock out? If you're on 72mHz, make sure your failsafe is set to go to idle, not off.


The sky is our canvas

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04-26-2009 05:01 AM  9 years agoPost 16
dkshema

rrMaster

Cedar Rapids, IA

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Had he been flying a PCM radio and it went into failsafe, I seriously doubt we'd be here talking about a flameout.....

-----
Dave

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

Team Heliproz

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04-26-2009 01:17 PM  9 years agoPost 17
playfair

rrKey Veteran

Rochester, NY

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I'd say that too dkshema, except I've seen it happen.
A guy at our field was chasing periodic flameouts for weeks.
When you're just hovering around, it's hard to tell if all your controls go to "hold last position", and the radio loss only lasts a second (long enough to kill the engine).

It was just an idea, since we really haven't found the problem yet.


The sky is our canvas

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04-26-2009 01:42 PM  9 years agoPost 18
nivlek

rrProfessor

Norfolk England

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The engine quit, no sputtering, no warning, just died.
I would say it's likely that it was a lean cut . I would double check all of the fuel tubing including the clunk line , making sure that the exhaust pressure nipple isn't blocked and if you don't find anything , richen the top end a few clicks .

At the end of the day , it gets dark .

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04-28-2009 05:46 AM  9 years agoPost 19
aerosmith

rrApprentice

Mississippi

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Hey guys, Well I got my heli parts today. Needless to say I got the heli repaired & started from ground zero with rotor head set-ups. After checking & re-checking every thing I decided to do a test flight in my back yard. It was dark so I turned on my outside lights. I simply cranked up & hovered. It was steady as a rock ! I flew with the same glow plug,fuel lines & even the same fuel that was in my tank when my nitro heli died during my last flight last week. It cranked up good as usual & idled good. I look forward to getting to my field & do some FF.

I wanted to be sure to thank all of you for your thoughts. I guess that I'll mark it up as just one of those things. This was a good learning experience.

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04-28-2009 05:51 AM  9 years agoPost 20
Auto180_OCMA

rrApprentice

Futaba City Z (Mobara)

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Hey happy you got it running

AMA 334000

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