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HelicopterEngines Plugs Mufflers Fuel › OS61 not running properly?
10-18-2004 09:00 AM  13 years agoPost 1
frogbaiter

rrApprentice

Oxford UK

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I have a Quick60 with an OS61. I'm running it on 15% nitro with an OS8 plug.

My problem is that while it starts and idles fine, at mid throttle and thereabouts (i.e. hovering and at least gentle flying speed) it's clearly not running properly. I think it's "pinking" (pre-igniting) but it could be simply missing. What that does is to cause the tail to twitch and wander constantly.

Any suggestions as to why it should do this, and what I can try to make it run smooth?


Steve
www.helicollective.org.uk

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10-18-2004 09:51 AM  13 years agoPost 2
Jambo

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Kent, UK

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Is this a new engine ? and has it been running fine up until now ? Is it running sluggish or fast ? What brand of fuel are you using ?

For the colder weather in the UK I have had to tweak my helis a couple of clicks recently.

If its been running fine the first thing I would do is put the needles back to stock and re tune (remebering where they are before you change them) Failing this you could have some dodgy fuel lines or gunk in the carb. I always check my fuel lines once a month, generally having to replace some every 2 months.

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10-18-2004 10:11 AM  13 years agoPost 3
frogbaiter

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Oxford UK

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It's not a brand new engine - I got the heli second hand - but it's not very old. I'm not sure I've had it running entirely properly. I've tried tuning it according to the manual, but I'll try again today.

I just wondered if the symptoms sounded familiar to anyone, and whether it was characteristic of lean running, too hot a plug etc

I noticed at the weekend I had to lean out my Sceadu 30 a few click in the colder, damper weather


Steve
www.helicollective.org.uk

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10-18-2004 10:34 AM  13 years agoPost 4
Jambo

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Kent, UK

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I would start off rich and lean out slowly until your problem comes back, then richen back up a click or two. Sounds to me that it might be running a bit lean and just needs some TLC of the needles. Does it do this if it is rich?

On all my OS engines the low end needle is set by the book at stock (about half), so this may be a good place to start.

You might find that a uniflow tank mod may help you if its leaning out over the course or a tank, check this link out:-

http://www.fraserker.com/heli/unifl...iflow_works.htm

Good luck and let us know how you get on later

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10-18-2004 10:40 AM  13 years agoPost 5
Al Magaloff

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12,199 Posts- Enough​Time Wasted. See Ya!

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What carb, 60B three needle?

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10-18-2004 01:00 PM  13 years agoPost 6
Drunk Monk

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Preston, UK

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my OS61 always missing when hovering, if you put it under load then it's fine. We've managed to track it down to the mid range being lean but it's a nightmare to dial in properly.


Stephen

I only open my mouth to change feet.....

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10-18-2004 01:49 PM  13 years agoPost 7
Dr Lodge

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Guildford, Surrey -​UK

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Stephen's point is valid. My Acrostar/Quick 60 has an OS61 LX and I've experienced the same thing. What fixed it for me was balancing the fan assembly as the vibration went through the entire heli and upset the mixture settings.

The fuel tank is also in the wrong place - when you go inverted the mixture goes very rich.

Vibe 90, Vibe 50, Vigor CS x2,
Dyna-x, Knight 503D, Logo 10,
TRex 500, Furion, Gaui EP200

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10-18-2004 01:59 PM  13 years agoPost 8
T.C.

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Nottingham. England.

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Is it an WC motor & what pipe are you running.

My 61 WC / MP1 WC15% alway's ran rich in the hover to the point of 4 stroking / 2 stroking, this would cause the tail to kick, it was a royal pain in the butt when I was trying to do smooth hovering manouvers.

I have now fitted a Bellwood twin plug head, 2 Enya #3 plugs, it's now smoother than a babies bum.

Try an Enya #3, I found this a better plug than OS #8.

Tony

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10-18-2004 02:00 PM  13 years agoPost 9
Dr Lodge

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Guildford, Surrey -​UK

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Try an Enya #3, I found this a better plug than OS #8.
I found the opposite!

But I also found 15% much better than 10%

Vibe 90, Vibe 50, Vigor CS x2,
Dyna-x, Knight 503D, Logo 10,
TRex 500, Furion, Gaui EP200

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10-18-2004 02:13 PM  13 years agoPost 10
T.C.

rrKey Veteran

Nottingham. England.

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Depends on whether it's rich or lean.

If rich go for a hotter plug Enya #3
If lean go for a colder plug OS #8

Or an A5 if you want to go colder still.

frogbaiter say's,
I think it's "pinking" (pre-igniting) but it could be simply missing.
So he's not sure. But the effect is.
What that does is to cause the tail to twitch and wander constantly.
That's what mine was doing, & I found it to be rich, hence a hotter plug.

Of coarse if the engine is a WC then he could simply adjust the midrange needle. But mine was running with the mid needle fully closed & still rich, a #3 helped but did not fully cure the problem.

Tony

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10-18-2004 04:23 PM  13 years agoPost 11
frogbaiter

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Oxford UK

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Thanks for the comments guys. It's a WC engine (three needle), and a Hatori muffler.

I went out flying today but forgot the manual for the engine, so I couldn't tune it from scratch. I tried richening it up a bit, but it was the same. I have noticed, as DM said, that it's ok when under load, but my flying at the moment only produces brief periods of load!

I'll give tuning from fresh a go, and also try an Enya #3 if it persists. Interesting that it isn't an unusual problem though!


Steve
www.helicollective.org.uk

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10-18-2004 05:41 PM  13 years agoPost 12
Al Magaloff

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Steve, Curtis has always maintained to treat the three needle carb as a two needle carb first. Shut off the mid-range needle, and tune the low, and high as if the carb were a two needle carb. Also, be sure your carb is open 50% at half stick, 0º pitch. Once the heli idles well, transitions well, and pulls hard at full throttle climb outs( you may need help with this part) then fine tune the mid needle for a steady, rich two stroke hover. If you have to add mid needle, you may have to lean the high needle a bit.

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10-18-2004 07:06 PM  13 years agoPost 13
frogbaiter

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Oxford UK

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Thanks for that, Al - I'll try it and report back


Steve
www.helicollective.org.uk

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10-18-2004 08:40 PM  13 years agoPost 14
steve69

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Berkshire, UK.

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Hey steve, I'll do some full power climb outs for you!

I'm really starting to enjoy them now

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10-18-2004 10:56 PM  13 years agoPost 15
frogbaiter

rrApprentice

Oxford UK

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You do a full power climb out with that, and it'll be in orbit!


Steve
www.helicollective.org.uk

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11-01-2004 09:12 AM  13 years agoPost 16
frogbaiter

rrApprentice

Oxford UK

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Just reporting back - yesterday was the first chance in a while to try the ideas out.

I took the two-needle approach to tuning the engine, and seemed to get promising results. With the midrange needle closed, it seemed to be running smoother than before, and the random twitching was gone; just some wagging. Reducing gyro gain made that better too. The only thing I became aware of later was a general "wobble" of the heli. I wonder if that's indicating a need for more headspeed?

When I landed it after the final flight of the day, though, I noticed smoke under the muffler, and discovered that the blanking bolt on the underside had gone - not sure when, but I'll have to wait to next time to see what happens when it's blocked off again!


Steve
www.helicollective.org.uk

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11-01-2004 10:20 AM  13 years agoPost 17
Al Magaloff

rrMaster

12,199 Posts- Enough​Time Wasted. See Ya!

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Keep at it Steve! Sounds like you are gaining on it. Yes, more headspeed.

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11-01-2004 10:46 AM  13 years agoPost 18
Dr Lodge

rrElite Veteran

Guildford, Surrey -​UK

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Ditto, that heli and engine like to be loaded.

Vibe 90, Vibe 50, Vigor CS x2,
Dyna-x, Knight 503D, Logo 10,
TRex 500, Furion, Gaui EP200

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11-01-2004 10:50 AM  13 years agoPost 19
frogbaiter

rrApprentice

Oxford UK

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I think I need to get hold of a tacho from somewhere. On my Sceadu 30, it seems more obvious when the headspeed is too high. The 60 sounds so different, and I'm wary of overcooking it!


Steve
www.helicollective.org.uk

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