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HomeRC & Power✈️Aircraft🚁HelicopterEngines Plugs Mufflers Fuel › OS 50 hyper performance
04-03-2010 01:07 PM  10 years ago
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MadHans

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Mosjøen, Nordland - Norway

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OS 50 hyper performance
Hi!

I'm really confused when it comes to engine tuning. I really don't know when things are ok.

Here is a short video of my heli, from hover to full pwr climbout to some fff.

Watch at YouTube

I'm flying in Normal mode here...

Personally I think the temp at high end seems ok. Not too hot at backplate after some fff.
Pinch test at idle seems ok too, but it's maybe a bit on the lean side(just below 3 secs).
But starting the engine can be hell sometimes. the idle is very "jumpy". Sometimes it cycles from almost dying to engaging the clutch and back to almost dying..and so on.. I use os#8
Pitch is +/- 10 degrees total throw.
Engine settles down pretty quickly into idle after auto from hover(tells me the idle isn't too lean), but could maybe have been better. with less rpm hang.

Smoke amount is in my opinion good and consistent throughout the whole range. The fuel I use does'nt smoke much.

BUT: To me the engine sounds too rich at hover(crackling/sputtering), and good at main needle(maybe on the edge of being a tad lean someties at fff). From what I hear, I want to lean the idle to get the rpm more constant, and not the rpm increase that is on the video.

Could you please listen to the sound of my engine..? I really would appreciate some opinions here..
My heli is vibration free, my thumbs are not...
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04-03-2010 03:20 PM  10 years ago
airdodger

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Johnston USA

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It may be hard to start because the idle is too lean. The engine should not hang at all, should settle right to idle, probably a little lean also.Chris
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04-03-2010 03:59 PM  10 years ago
Zaneman007

rrElite Veteran

Texas - USA

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Engines are hard to tune.

Although I have friend who tunes by feeling the back plate with his finger and he does a most excellent job, I have burnt my finger doing that. And what feels hot to me feels cool to him. That is why a recommend a temp gun.

With an OS engine, the low needle will effect the high needle and visa versa and OS's web site describes the tuning process better than I can.

Or

Get the engine started, now have a friend hold the main blades. Lossen the nut that holds the low end needle in place just a bit. Now take your screw driver and adjust the low end until it hums and your usually good. Now lock it all down. I do this and it starts instantly.

PS I am assuming that you have gone over the obvious; glow plugs, fuel line, air leaks, etc.

AND what airdodger said.
Old Guys Rule!
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04-04-2010 02:20 PM  10 years ago
BarracudaHockey

rrMaster

Jacksonville FL

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http://www.raptortechnique.com has a couple of really good engine tuning articles that apply to any nitro engine.Andy
AMA 77227
http://www.jaxrc.com
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04-04-2010 09:18 PM  10 years ago
ChrisMoore

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Bay Village, OH

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Engine settles down pretty quickly into idle after auto from hover(tells me the idle isn't too lean), but could maybe have been better. with less rpm hang.
If it lagged from high to low it would tell me that it is too rich at the top. If it takes some time to get from high to low that means it is still burning some fuel and might be slow coming down. Your engine, you say, isnt lagging when it comes down...but you could try richening up the top end a few clicks.

As for the idle I would encourage you to richen that idle one width of one screw slot turn and try it out. If you have glow ignition, and have air in the carb, and there isnt any air leaking into the fuel lines then you should start right up (unless you dont have enough fuel). I would think that you would want to richen up that idle and use trial and error to get it just right.

You shouldnt need to loosen the bolt (hex head) that holds the idle adjustment screw, you should be able to just turn the small idle adjustment screw...one width of that slot at a time.
Chris. AMA 497715 IRCHA 3351
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