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Century Hawk - Falcon - Raven - Predator > hawk pro w/ stalling issue:repost from engine/fuel thread
 
 
929freak
Heliman
Location: Warrington Pa

I have a hawk pro with a os 37...it has around 20-25 flights on the motor and everything was going fine until Saturday,I went up and was hovering around for about 3-4 minutes when the motor just died.It didn't sputter or hiccup or anything it just stalled,well I did my first auto and got away with out any damage(whew!). I know the motor is not lean,maybe even a little on the fat side,but when I pulled the plug the coil had a whitish almost shiny appearance and it seemed a little distorted,yes it looked like a plug out of a over lean motor,but I know its not lean!!! also I put the plug back in(no spares w/ me) and the motor fired right up,didn't fly just started it to run the fuel out of the lines. so what do ya think?




this post was started in the engines thread...but I thought maybe this could be something common to the hawk
07-30-2008 10:32 PM
 
 
az_heliguy
Senior Heliman
Location: Florence, AZ

its always been my understanding that if your plug has a sort of "white-ish" color to it and its dry, that you are more then likely lean on the top end needle, especially even more so if the coil on the plug has some distortion to it... i can pull my plug that ive had in for over 5 gallons in my 50 and it would look almost brand new, no distortion, no change in color and it may even be a little wet with oil too...

i would suggest to try an add about 3-4 clicks on the high end needle to fatten it out some and try again...
07-30-2008 10:52 PM
HOMEPAGE  
 
 
Mutt
Key Veteran
Location: t ca usa

this issue is not a commen hawk problem it is a commen lack of proper tuning problem if it is white like that and dry its way to lean on the top end richen it up.
07-31-2008 12:17 AM
 
 
Ray Fernandez
Elite Veteran
Location: Guam (U.S.A.)

I agree with mutt. It is an engine problem.

You mentioned the whitsh coil. That is indicative to a lean running engine. You also mentioned that you have been running it for sometime now. Do you have a header tank on the heli? Have you checked your fuel lines for possible leaks or pin holes? Also check to see if the engine head is bolted on tightly. Check also to see if your carb has lossen.

Your engine is getting air that should not be there.

Ray Fernandez - GUAM
07-31-2008 03:34 AM
 
 
az_heliguy
Senior Heliman
Location: Florence, AZ

good idea on checking the head bolts to make sure they are tight!!! a buddy of mine just blew his month old os 50 hyper because they head bolts loosened up and leaned itself out, blew a hole clean through the top of the piston...
07-31-2008 03:45 AM
HOMEPAGE  
 
 
929freak
Heliman
Location: Warrington Pa

First off let me start by saying I am in no way new to nitro tuning,I have been running nitro for over ten years(albeit ground vehicles) regardless that explains my surprise to that glo plug. I have since removed the header tank,put in a new main tank I had sit tin around as well as well as all new lines and filter. same result fires up,spools up,1-2 minutes into flight and I'm practicing autos again!!!!
07-31-2008 02:37 PM
 
 
az_heliguy
Senior Heliman
Location: Florence, AZ

so after the engine starts and your up in the air, when the engine dies, does it just die with no warning or anything or do you notice it losing power and then dying?
07-31-2008 03:21 PM
HOMEPAGE  
 
 
Mutt
Key Veteran
Location: t ca usa

I am so sorry but I dont understand this nature turning your talking about. Never heard of tuning nature myself. Your running lean plain and simple find the reason for it can be fuel lines clunk fuel tank mistuned several reasons for a lean run but its running lean.
08-01-2008 12:30 AM
 
 
Blade_Master1
Key Veteran
Location: Canada

I have had a perfectly good looking glow plug die after 10 or so gallons, swapped it no more problems

try tuning with a 3/4 tank instead of a full

JM2C's :)
08-01-2008 12:43 AM
 
 
Ray Fernandez
Elite Veteran
Location: Guam (U.S.A.)

This might be another thing to check: Clutch and clutch lining.

Are these aligned? Something is causing your engine to stop and I was wondering if a misalignment problem could be the cause.

Ray Fernandez - GUAM
08-01-2008 12:46 AM
 
 
Blade_Master1
Key Veteran
Location: Canada


if you do the lower section in half you can see the gears to adjust engine to the itermediate gear alignment "although very limited maybe 2mm up & down "
snug up the engine { ^^^ } on leftside frame then install rightside

I find it easier to leave the leftside rame attached to upper frame mostly and udoing just the lower 2 bolts on the servo tray
undo the throtle link at engine

Just sharing not makeing a statement

JM2C's :)
08-01-2008 01:13 AM
 
 
929freak
Heliman
Location: Warrington Pa

mutt...reread my post,nature??? what the hell?? I meant nitro(I was tired)ha ha. as far as a lean condition,I don't think thats the case.it still has the same problem with a new plug and this plug looks good (brownish,almost tan,little wet)that first plug was a mystery as I am still running on the rich side.some one mentioned the clutch.....hmmmmm I did have a hot start recently and had to replace the clutch and bell.hadn't thought about it.
question,could my clutch tolerences be too close? so that when it starts to get hot and the metal expands its binding???
az-guy,no warning,just dies instantly
08-02-2008 08:50 AM
 
 
Ray Fernandez
Elite Veteran
Location: Guam (U.S.A.)

Recheck the clearance of the clutch to the lining in the clutch bell.

Ray Fernandez - GUAM
08-02-2008 01:20 PM
 
 
929freak
Heliman
Location: Warrington Pa

Ray,I will check...but I'm confused,once its engaged how could it kill the motor?
08-02-2008 02:51 PM
 
 
929freak
Heliman
Location: Warrington Pa

o.k. I can't explain this but I figured out why it kept "stalling".My govenor was for some reason telling my throttle servo to go to the closed posotion for a nansecond then back to the previous position....I went ahead and reprogrammed my gov and haven't had an issue all day.as for that plug I mentioned that looked lean,there was a pin hole in a fuel line,caused the lean condition but wasn't the cause of the stalling. thanks for all the help and suggestions...
08-03-2008 04:39 AM
 
 
Ray Fernandez
Elite Veteran
Location: Guam (U.S.A.)

Quote 
Ray,I will check...but I'm confused,once its engaged how could it kill the motor?

As the clutch disengages, the unit might have a uneven "bump". Could be caused by a deformed clutch bell or that one of the clutch arm maybe off.

Either way, I am glad you found the solution.

Ray Fernandez - GUAM
08-03-2008 05:34 AM
 
 
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Century Hawk - Falcon - Raven - Predator > hawk pro w/ stalling issue:repost from engine/fuel thread
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