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HomeAircraftHelicopterHelicopter Main Discussion › os max 32f needle settings?
04-26-2009 03:46 PM  9 years agoPost 1
Streborz

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Greenville, Ohio

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Hello
Does anyone know the needle settings for OS Max 32F HX engines? It's my first nitro helicopter (Concept 30) and I don't know if it has been messed with by previous owner, after all the paddles and the main blades were installed incorrectly. OS’s website is not specific on the settings they state that it (Mixture Control Valve) is factory set. What is factory set? ....I don't know. It was at 2.75 turns out when I checked it, but it was rich on bottom and lean on top. I have to land several times to richen high speed needle (the big needle) throughout a tank of fuel. I end up at about 2 turns out on the high speed. Does this make sense to any one? Help with this matter would be greatly appreciated.

Thanks,
Ross

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04-26-2009 07:14 PM  9 years agoPost 2
dkshema

rrMaster

Cedar Rapids, IA

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I checked it, but it was rich on bottom and lean on top.
It would appear that you have at least a grasp of what lean and rich mean. That's good. In lieu of having the factory settings, you can figure out what the needles actually need to be set as long as you can get the motor to start, idle, and run.

I believe the mixture control valve is the one that's recessed into the throttle barrel and requires a small screwdriver to get at.

Actual needle settings vary from heli to heli, muffler to muffler, day to day, and depend a great deal on the fuel you are using. You'll get different answers simply due to the nitro percentage you have chosen to use.

To set your needles:

Maintain idle at low throttle using the throttle trim on your TX, not the low speed needle. Adjust the low speed needle so that the motor transitions from idle up to about hovering RPM smoothly without blubbering, sputtering or just suddenly dying.

Blubbering and sputtering means the low speed is too rich. If the motor just dies suddenly, or hesitates, the low speed needle is too lean.

Once you get the low speed set about right, lift off and go to full speed, and determine if the motor is too rich, or too lean. Adjust the high speed needle accordingly.

The two needles interact to a large extent. Re-tweak each one until you get them balanced well.

You may be able to lower your throttle trim to maintain a decent idle as you get the two needles properly set.

Run the motor for 30 seconds or more to make sure it's up to operating temperature, then drop the motor down to idle. Let it sit, idling. If the motor slows down gradually, the idle's too rich, if it speeds up a bit, the idle's too lean.

Finally, you can perform the "pinch" test. After you have the motor up to operating temperature, let it sit at idle. Pinch the fuel line. The motor should continue to idle for about 3 to 5 seconds before it begins to speed up and die. If it runs much longer, the idle is too rich. If it goes much shorter, the idle is too lean.

As for factory settings, the manual's way out of print, you'll have to find someone with a copy to help you.

-----
Dave

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

Team Heliproz

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04-26-2009 08:31 PM  9 years agoPost 3
Hamo

rrVeteran

Ireland

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I have the OS32 manual in PDF format. Send me your email address and I'll email it to you tomorrow or you can download OS engine manuals from here http://www.osengines.com/manuals/
Hamo

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04-26-2009 09:23 PM  9 years agoPost 4
dkshema

rrMaster

Cedar Rapids, IA

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Didn't see the 32F manual out on that page, but I think the 32F uses the 3H carb, that manual IS out there.

-----
Dave

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

Team Heliproz

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04-27-2009 04:03 AM  9 years agoPost 5
Streborz

rrNovice

Greenville, Ohio

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Thanks for pointing me in the right direction.
dkshema: Thanks for pointing me in the right direction. Your tips seemed to be what I needed and should apply to almost any engine situation. It seems to run better and I am enjoying flying it even though the winds have been in the 30-40 mph range here in Ohio the past several days. I had to fiddle with the throttle curve after making the carb changes and I can see this is going to take some time and patience and I am going to have to be careful to not dial myself out of the game. The little motor smokes away now and is not too hot to the touch when it lands and has much better climb out power now. 3 turns out on the Mixture Control Valve and 5.5 out on the High Speed Needle. 5.5 seems like a lot but it runs well there.

Thanks to all who replied.

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04-27-2009 04:14 AM  9 years agoPost 6
dkshema

rrMaster

Cedar Rapids, IA

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Happy to have helped. I try to make the answers fit so that you can apply the knowledge down the line. It works better that way.

-----
Dave

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

Team Heliproz

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