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HelicopterMain Discussion › Engine help, please
08-12-2007 07:00 AM  10 years agoPost 1
Cralis

rrNovice

Dunfermline,​Scotland, UK

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Some background.. I have been flying my Raptor 50 (OS50 Hyper, TT Woodies, GY401... etc) for 2 months in Scotland. I have recently relocated to Cape Town, South Africa. The heli came by sea, and was in a container for close to 6 weeks. Yesterday I attempted the first flights in Cape Town. It had a MP5 put on 2 days before it was shipped to Cape Town. I set it up in a garage before going for the flight. Radio all OK, and started it first time, so all seemed A-OK. I richened the mixture a bit, as I hear you need to do this with a MP5.

Right, took the heli to a nearby football field.
Started up, and all was fine.. Seemed to spin very fast to get it to lift. Was a bit worried I was over reving near mid stick, but it may be because I'm not used to it. I have a linear throttle curve, with -4, +5, +11 on pitch. Does that seem OK?

Anyway, took off, and very wobbly... Rusty as hell! But it came back slowly. Did some drifting stuff, side on small slow fly bys...

Then it happened...
I was flying by, slowly, around mid stick, heli about 5 feet off the ground, when the engine suddenly seemed to die.. but came back. Heli dropped a foot or two... It happened twice in around 3 seconds... and nearly went in... So I flew it back to a landable bit of ground.
Felt the base plate.. could keep my finger there for around 3 or 4 seconds. Decided not to tempt fate, so packed up. After 4 or 5 minutes, checked the base again, but now it was hotter. That's normal, right?
It had loads of spoke, more at take off, but that's normal, I think.
So now I MUST find out what caused that... Any ideas? It seemed to drop revs, and come back, then drop, then come back.. very quickly. I richened 2 clicks before the flight.

I started it and let it idle... and all was fine, but twice, during idle, it just cut. Engine sounded OK before...

Oh, please engine boffins, please help. Don't think it was a glitch. Can a glitch only effect the throttle? The heli was very stable when it happened... Just dropped and went up, then dropped, and then up again.

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08-12-2007 07:49 AM  10 years agoPost 2
mikeflyz

rrApprentice

Westlake Village, CA

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If you have a fail safe (like PCM) on the throttle, yes that can just affect the throttle.

After a move, you might have picked up some crud in the fuel system. I'd replace the fuel lines, remove the carb and thoroughly clean it. Replace the fuel filter, then try again. Other than that, try a new glow plug, check for a bad throttle servo, or an air leak in the engine or fuel system.

See if it runs just as it did with the muffler/pipe you used before.

Mike
MA Fury Extreme, JetCopter SX

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08-12-2007 07:55 AM  10 years agoPost 3
Cralis

rrNovice

Dunfermline,​Scotland, UK

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Thanks Mike.
Problem is, I sold the old TT pipe when I got the MP5. SO I can't go back. I've checked the plumbing - all seems OK. Air bubble? Maybe. Glow? Possibly, as I blew 2 on the last day of flying before I packed the heli to ship to SA.
I'm not advanced enough to remove anything on the engine. I'll need to find someone here in Cape Town who may be able to have a look over it.
Maybe it was a once off, and some muck in the engine is now gone? Wishful thinking maybe?

To add to that, I'm using PPM.

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08-12-2007 08:16 AM  10 years agoPost 4
legoman67

rrElite Veteran

Nanoose Bay B.C,​Canada

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its not that hard to remove the carb, heck its one screw, just lossend it and the carb pops off. you should be comfortable to remove any part from your heli and put it back.

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08-12-2007 08:52 AM  10 years agoPost 5
Cralis

rrNovice

Dunfermline,​Scotland, UK

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I'd need to remove the engine from the heli, right?

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08-12-2007 09:29 AM  10 years agoPost 6
JRjoe

rrElite Veteran

Jonesville , IN ​USA #1

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Just remove the motor and clean it out real good. Replace all the fuel lines. Look for anything loose on the motor like the carb or the back plate or head bolts. Fire it up and see what happens. You have a good motor and shouldn't have to many problems. 9 times out of 10 it's not the motor and just something else real simple/stupid........

My experience tells me to look for something minor.....(fuel tube)...


JRjoe.....
Indoor plumbing??? No, we don't need that!!!

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08-12-2007 01:12 PM  10 years agoPost 7
airdodger

rrElite Veteran

Johnston USA

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I would look at the rear bearing, it could be pretty rusty in six weeks. Any rust on the bearing and it should be changed. Did you switch fuels too. If you were using a fuel with castor that can get thick and block passages when sitting for a time.

Chris

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