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Beginners Corner > to richen or to lean out. That is the question
 
 
dbldins
Senior Heliman
Location: Danville,Ky.

My Posts This: Topic  Forum		As the weather cools do you richen your mixure? How about altitude, does it affect?

I need helirehab before I'm livin under a bridge.
11-04-2009 04:00 AM
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alexz
Senior Heliman
Location: shakopee mn usa

My Posts This: Topic  Forum		No. Just the opposite. When the air is thinner you would want to use less fuel. So you will be terning your needle in a couple clicks to lean it out some.
11-04-2009 06:14 AM
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TachyonDriver
Key Veteran
Location: Chipping, Lancs, UK

My Posts This: Topic  Forum		But if you stay at the same altitude then as the air gets colder, it gets denser so you need to go richer - the denser air allows you to burn more fuel, surely?

Tach.

Little Spinning Bundle of Joy® DON'T DISS THE DINO!!
11-04-2009 01:39 PM
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dbldins
Senior Heliman
Location: Danville,Ky.

My Posts This: Topic  Forum		Leaning out will lead to more performance, yes?

I need helirehab before I'm livin under a bridge.
11-04-2009 08:33 PM
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Rafael23cc
Key Veteran
Location: Junction City, KS

My Posts This: Topic  Forum		1. Dense air requires more fuel.
2. Thin air requires less fuel.

A. Cool-cold air is dense.
B. Hot-humid air is thin.
C. High-altitude air is thin.

Quote 
Leaning out will lead to more performance, yes?

Leaning is not the same as Higher performance. Your engine is either tuned or not.

Rafael

Keep your feet on the ground, but your eyes on the sky.
11-04-2009 10:18 PM
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itsjojo
Veteran
Location: North East Pennnsylvania

My Posts This: Topic  Forum		I'm saving this post! Well put Rafaelcc
Thanks

Trex 500esp 600N Pro & 700 Nitro Dx7
11-04-2009 10:20 PM
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dbldins
Senior Heliman
Location: Danville,Ky.

My Posts This: Topic  Forum		By rafael23cc I am correct alexz. Cold air is denser leading to more fuel. So you richen when cold.

I need helirehab before I'm livin under a bridge.
11-08-2009 02:39 AM
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alexz
Senior Heliman
Location: shakopee mn usa

My Posts This: Topic  Forum		OK, I'm wrong. I thought cold makes the air thinner.
11-08-2009 04:07 AM
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Twrecks600
Senior Heliman
Location: Round Rock, Texas

My Posts This: Topic  Forum		I go by feel. If I can hold my finger on the back plate for 5 to 7 seconds, I am good!! I check temp after every flight and make adjustments as necessary. Usually once the mixture is set, I don't have to touch it all day unless the ambient temp drastically changes. I have been using that method for 1 year now and have never had to replace any bearings, rings, liners, rods, etc... I do replace the glow plug every 3 or 4 gallons whether it needs it or not.

Just my 2c!!
11-08-2009 04:46 AM
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dbldins
Senior Heliman
Location: Danville,Ky.

My Posts This: Topic  Forum		Some days nothing goes right! All fabulous one day the next(murphy's law) takes effect.0 for 3 today. I'm tuned now it's an rx pack problem.

I need helirehab before I'm livin under a bridge.
11-09-2009 12:09 AM
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GREYEAGLE
Key Veteran
Location: Sioux City IA

My Posts This: Topic  Forum		Be careful when thinning a motors in cool temps.

It's always the 1st instinct to thin the needles during cold weather - "please" be care full as you will cook a motor in a heart beat and it can happen in one run.

The cool weather brings on the needle chasers, the glow plug changers and lot's of guy's standing around in groups, diagnosing motor problems., tank problems ect.

Motor changes day to day - needle spinners keeping up right with them. Cold fuel flow's slow, it's easy to run lean.

Bottom line when it' gets cold - set it to the safe side - except a bit of loss in performance, and live with it - be satisfied your just getting in some stick time.

Cold weather also put's the crimp on your batteries. Watch them like a hawk !

greyeagle
11-09-2009 04:23 AM
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Twrecks600
Senior Heliman
Location: Round Rock, Texas

My Posts This: Topic  Forum		How cold are we talking? 30's? 20's? below zero? I fly in Texas and it might get around 40 at the coldest when I fly and I have never had to "chase" my needle. I might make a 2 click adjustment but that's about it. My engine temp has always been good before, during, and after my flight and I have never had a fuel flow problem when it gets cold running CY wildcat 30% fuel.
11-09-2009 12:49 PM
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Rafael23cc
Key Veteran
Location: Junction City, KS

My Posts This: Topic  Forum
Quote 
How cold are we talking? 30's? 20's? below zero?


Below is a google search about air temperature and density. Bottom line is that 10degree change is enough.
http://www.google.com/search?hl=en&...+and+tem&aqi=g1

Having said that....
Quote 
I might make a 2 click adjustment but that's about it.

That is all I expect going from summer flying to winter flying. Any more than that, and you should be checking your filters, carbs, fuel lines ect.

Rafael

Keep your feet on the ground, but your eyes on the sky.
11-09-2009 02:00 PM
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GREYEAGLE
Key Veteran
Location: Sioux City IA

My Posts This: Topic  Forum		Their's a big difference from here to their.

Up here - Iowa and further North,- if your an all weather flier it makes a big difference. We have once a year a February frostbite fun fly, and it brings out some interesting scenario's.

Actually had "real" carburetor icing on four strokes, seen guys wrap foil around cylinder's or install air baffle's in front of the motor's on planks. It's not uncommon too spin the needle 1/2 to 3/4 open just to get some type of idle - and leave the ignitor on for a bit longer till they soak a bit of heat.

When done flying, the goo is so thick, forget wiping it off till you get home -it's more like Vaseline till it warms up. Batteries can go from 5.60 to 4.8 in two flights.

If it's 50 we're still wearing flip flops and tank tops - in early spring that's a heat wave !



greyeagle
11-10-2009 01:10 AM
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Dilbeck
Key Veteran
Location: Springdale Arkansas

My Posts This: Topic  Forum		GREYEAGLE, I know you guys are used to the temp up in that neck of the woods and make do with what you have, but OMG are you kidding me, I wouldn't last more than 3 days in that climate.

If it doesn't fly sell it!
11-10-2009 02:19 AM
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Brokenwing II
Senior Heliman
Location: Watertown, NY

My Posts This: Topic  Forum		Ok, I went out for the first time today in awhile, around 40 degree here in Watertown NY, after my first flight i could only hold my finger for about 4 or 5 seconds. That being said and with the cool temps I should make my O.S 50 Hype a little more rich? so start with a click or 2 to the left?
11-11-2009 09:23 PM
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Dilbeck
Key Veteran
Location: Springdale Arkansas

My Posts This: Topic  Forum		4-5 seconds? For gods sake call it good, maybe 1 click to the clockwise/right.

If it doesn't fly sell it!
11-11-2009 10:39 PM
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Brokenwing II
Senior Heliman
Location: Watertown, NY

My Posts This: Topic  Forum		Wasn't sure how critical the time thing was. I've read others saying if they couldn't hold it for at least 5-7 you needed an adjustment. If 4-5 seconds is ok then I'm good. I haven't flown in the cold here before so I din't know if I needed and adjustment or not. Looks like I'm ok. Thanks for the advice.
11-11-2009 10:49 PM
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Beginners Corner > to richen or to lean out. That is the question
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