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HelicopterMain Discussion › Hot weather and mixture
09-04-2003 05:07 PM  14 years agoPost 1
RotorX

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London

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Hi,

I have been under the impression that if the weather gets hot then you need to richen the needle valve. I spoke to someone today and he says that no this is not the case and that you would need to lean the engine, something to do with the oil becoming thinner??

Can anyone shed any light on this for me i would be grateful....

Kaz

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09-04-2003 05:32 PM  14 years agoPost 2
DOKEY

rrProfessor

Northamptonshire UK

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I have always had that same impression.

But after flying with Russ Deakin and going through a few setups, he also told me same that you should lean the engine when the weather warms up.

Ryan.

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09-04-2003 05:39 PM  14 years agoPost 3
Rawlie

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JHB

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My understanding is as follows:

Hot day = leaner mixture
Cold day = richer mixture

Hot air expands and is thus thin, cool air is dense. If there is less air passing through the carb you need less fuel, more air = more fuel.

I hope I'm right

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09-04-2003 05:44 PM  14 years agoPost 4
vitek

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Corvallis, OR

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You're right.

Cold temps generally mean increased air density; more oxygen per unit volume of air. More oxygen means you need more fuel to keep the mixture the same, thus, you need to richen the needles.

Just the opposite for a hot day.

Travis

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09-04-2003 05:56 PM  14 years agoPost 5
rockier

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Las Vegas

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That is right for Hot and Cool but you also need to look at how much moister is in the air too.

------,\\\|///,-----
___*| # # |*
oo0---(_)---0oo

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09-04-2003 10:58 PM  14 years agoPost 6
RotorX

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London

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Thanks guys,

While we are here on the subject (ish) of fuel can some also tell me with higher nitro, i have heard it said many times, you can run cooler cause you have to richen it, i would have thought with all that extra nitro you would lean it.?

Kaz

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09-04-2003 11:00 PM  14 years agoPost 7
G.Man

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Bristol

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not down to heat, more down to humidity and air density....

if it gets hot and humid you usually have to lean the mixture...

and vice versa

Don't Email me as I wont reply - PM Only (spam countermeasures)

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09-04-2003 11:06 PM  14 years agoPost 8
cwhover

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El Paso, TX

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KAZ

Generally speaking, you do richen th mixture with higher nitro fuel because the nitro supplies extra oxygen, which allows you to burn more fuel.

Carl
VISA field rep

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09-05-2003 02:14 PM  14 years agoPost 9
RotorX

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London

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Thanks for clearing that up for me


Kaz

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HelicopterMain Discussion › Hot weather and mixture
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