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HomeAircraftHelicopterHelicopter Main Discussion › temperature changes and carberator settings
02-05-2008 11:14 PM  10 years agoPost 1
Dilbeck

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Springdale Arkansas

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Got a small problem, I live where one day its 73 deg and the next its 35 deg then back to 55 deg 2 days later, My os 37 does not seem to like these changes nor do i for im always adjusting the high speed needle, doesnt seem to bother the low speed needle, Is their that much diff needed to keep it running properly? It seems the hotter it is outside the richer the fuel and the colder the leaner it needs to be. I dont know maybe 1 or 2 clicks per 10 deg? Is the norm? Its only the winter months that jump this amount from day to day In the summer its just HOT and humid. I bet in florida you just fuel and fly!

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02-05-2008 11:18 PM  10 years agoPost 2
ChopperEddie

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Pennsylvania, USA!

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You should have to richen it in cold weather. Colder air is more dense and requires you to richen the needle to add fuel to the mixture. The opposite is true in hotter weather.

-- Runway? We don't need no stinking runway! --

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02-05-2008 11:26 PM  10 years agoPost 3
airdodger

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Johnston USA

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What ChopperEddie said should be true, unless you have an inadequate or marginal cooling system. Give some info our crystal ball might not be working. Put some info in your profile and we won't need to ask.

Chris

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02-05-2008 11:27 PM  10 years agoPost 4
Dilbeck

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Springdale Arkansas

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Thanks im getting closer, Seems i cant remember which way, was just trying each way a little to get it right.

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02-05-2008 11:30 PM  10 years agoPost 5
ChopperEddie

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Pennsylvania, USA!

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Turning the needle right will lean the mixture, left will richen it.

-- Runway? We don't need no stinking runway! --

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02-05-2008 11:40 PM  10 years agoPost 6
Dilbeck

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Springdale Arkansas

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Sorry, just fixed the profile thing, Forgot all about it from day one i was so excited!

Clint

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02-06-2008 12:51 AM  10 years agoPost 7
Yug

rrMaster

UK. Herts

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The effects of temperature on air density are greater than one might think. Cooler air = richer mixture, plus the blades have more air to work with. 2 or 3 clicks per 10 degrees sounds about right.

Vegetable rights and Peace

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02-06-2008 02:17 AM  10 years agoPost 8
bigdad390

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East. Liverpool, Ohio

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Not only temp, but humidity may effect the mixtrure also.

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02-06-2008 03:04 AM  10 years agoPost 9
GMPheli

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W. Bridgewater, MA USA

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You could try a Carbsmart. It is a device that uses a temp sensor on the head and adjusts the needle valve for you using a servo.

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02-06-2008 03:36 AM  10 years agoPost 10
Dilbeck

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Springdale Arkansas

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Thanks for all the replies, Cold= richer, Hotter = leaner. Approx 2-3 clicks per 10 deg temp change. High speed needle only? You guys are the bomb. (thats what my kids say anyway)

Clint

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02-06-2008 06:03 AM  10 years agoPost 11
JAGNZ

rrProfessor

Auckland, New Zealand

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Man I LOVE my new CarbSmarts just for the reason you describe...


Jason Greenwood

www.3dheli.co.nz

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02-06-2008 12:17 PM  10 years agoPost 12
Dilbeck

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Springdale Arkansas

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CarbSmarts? what will the think of next?

Clint

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02-06-2008 01:45 PM  10 years agoPost 13
heli-cuzz

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Pittston, Pa. USA

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Here's something I C&P for you.

Temperature. Hot weather requires a leaner mixture setting; cold weather requires a richer setting. Most people assume the opposite because they treat the mixture needle like a thermostat. It is wrong to assume that colder weather requires a leaner setting to keep heat in the engine and vice versa. Cold air is denser than hot air. The denser, colder air packs more oxygen into the engine, so going from hot weather to cold needs a commensurate increase of fuel to balance ratio of fuel-burning oxygen and the fuel itself. The opposite is true in hotter weather. Going from cold to hot weather requires a leaner mixture setting.

Humidity. Humidity is the amount of moisture (water vapor) in the air. Moisture in the air takes up volume that would otherwise be occupied by fuel-burning oxygen. Less oxygen means less fuel is required to maintain a proper ratio of air and fuel. High humidity requires a leaner mixture setting than dry conditions.

Barometric pressure. A barometer measures the atmospheric pressure (generally listed in the local newspaper or on the local weather forecast on TV). Higher barometric pressure readings mean more air is getting into the engine, requiring a richer mixture setting to balance the air/fuel ratio.

Altitude. Altitude is an important factor that most of us ignore, yet it affects the engine’s performance possibly more than any other element. The general formula for power loss with increases in altitude is 3 percent for every 1,000 feet above sea level. If you race in Colorado at 5,000 feet instead of in California at sea level, you can expect to lose about 15 percent of the engine’s potential power output, if the engine is tuned properly.
Air is thinner at higher altitudes, which means there’s less fuel-burning oxygen than at sea level. You might sense a common theme here: less air (oxygen) means less fuel to maintain the proper air/fuel ratio. So, running at higher altitudes requires a leaner mixture setting than running at sea level.

TUNING
This chart indicates the direction in which you should adjust the fuel mixture when faced with changing weather and other conditions. It assumes the engine is currently well tuned. You could face any combination of conditions listed in the chart; knowing which way to go with the mixture adjustments is half the battle.
Higher air temperature Lean
Lower air temperature Rich
Higher humidity Lean
Lower humidity Rich
Higher barometric pressure Rich
Lower barometric pressure Lean
Higher altitude Lean
Lower altitude Rich
Higher nitro content Rich
Lower nitro content Lean
Higher oil content Lean
Lower oil content Rich
Hotter glow plug Rich
Colder glow plug Lean

Fury 55 NIB Furion6 CGY750 fbl helicopter-Frenzy CGY750 fbl nitro-Frenzy fbl NOBAR90

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02-06-2008 05:45 PM  10 years agoPost 14
w8qz

rrVeteran

Grand Rapids, MI - USA

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I have a similar thing with my OS 32 heli - it seems the power available is such that it's gotta be set 'right on' to run properly. Lean on a hot day, richen on a cool one. When in doubt, start out a little rich and see how it hovers. Going by the sound of the motor has given me the most consistent results - it should 'come on pipe' by 1/2 tank, or sooner - but will be slightly rich-sounding on a full tank.

"The helicopter is much easier to design than the aeroplane, but is worthless when done."

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02-06-2008 06:40 PM  10 years agoPost 15
Dilbeck

rrElite Veteran

Springdale Arkansas

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Outstanding,Great advise from all. Its all coming to me know how this all got started. Stock Hawk with stock muffler, warm weather, Then purchased muffler upgrade that changed things to a richer state or so it seemed. Then cooler weather about the same time i went from 30% cool power to 15%. (Let the needle chasing begain) Then to add fuel to the fire went from a OS#8 to a OSa3 all around the same 2 week span with the weather changing also! Man what else could i do to F&%$ up my perfectly tuned engine?????

Clint

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