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HelicopterEngines Plugs Mufflers Fuel › engine tuning 401
10-22-2004 10:41 PM  13 years agoPost 1
fullload

rrApprentice

Wichita,Ks

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I recently burned up my engine when attempting to lean it, or tune it as it was [I thought] running rich. The engine was an OS 50 with the standard carb. which can be tought to tune anyway. I new to helis so maybe everyone does this, but I wonder if tuning for the appropriate blade rpm might be a better way to tune for us beginners instead of engine rpm. For example, if my Sceadue flys well at 1850-1900 rpms, perhaps leaning the carb only to get that rpm would be a better way. Any input please.

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10-22-2004 10:48 PM  13 years agoPost 2
G.Man

rrProfessor

Bristol

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You tune your carb for non-lean run in a full power climbout...

At hover your only pulling 40ish % throttle...

Climb the heli full power and look for bogging (too rich) fuel starvation (engine trying to die, too lean) loss of smoke (too lean)...

On a properly tuned motor at 9.5 degrees full climb, the rotors should gradually start to overspeed without loss of smoke or nasty crackling sound from the exhaust (detonation due to lean)

It takes a good ear and eye

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10-23-2004 08:53 AM  13 years agoPost 3
jerrythercpilot

rrVeteran

--South Florida --

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If you new to helis.It may be better to tune your engine on a bench with a propeller. If you have access to a test stand I would recommend this. This way you wont lean it way out and destroy it.Then once you have the thing in the "ballpark" re-install and you'll be able to see and hear what a properly tuned motor is like. You can tweek it from there but it'll probably be just fine for begining stuff.

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10-23-2004 10:23 AM  13 years agoPost 4
Al Magaloff

rrMaster

12,199 Posts- Enough​Time Wasted. See Ya!

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I don't think bench running teaches you much, except that the motor will start and run well. The difference between the bench and the heli is, that in the heli, a lot of the fuel goes to cooling. So, if bench run first, be prepared to richen both needles quite a bit. The best tuning method is Galifrey's, but you need to be able to do full power climbouts. Many beginners can't, nor do they have the experienced pilot to do this for them. The "finger in the back cover" method can work well here.

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10-23-2004 10:45 AM  13 years agoPost 5
G.Man

rrProfessor

Bristol

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I have had some PM's pointing out hat the chap starting this thread is a beginner...

My point of posting the above method, was to show this is not something a newbie can "find a new method for"

You can either do the full power climbs or not, if not seek help...

You also need an ear and an eye for tuning a motor, something that comes from the right experience, not just trying assorted plank methods...

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

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10-23-2004 06:24 PM  13 years agoPost 6
fullload

rrApprentice

Wichita,Ks

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Good help

I understand the input about tuning at climb out etc. but I'm new enough that I can listen to the engine and hear nothing. [also being pretty deaf doesn't help] What I was looking for was a relatively fool prrof way to at least get close while developing the ear and feel for a well tuned engine. Some of the guys at the field are pretty adept with tuning while most don't really seem to have a clue. I have flown planks, both gas and glow, but helis do tune different [ at least by my reconing].
It would seem that tuing to blade rpm gets me into a good flying mode which was where I was when I toasted my engine before. What I could not descern was if I needed the last few clicks.
You guys are a terrific help and it is really fun reading your input. Thanks much.

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10-23-2004 11:19 PM  13 years agoPost 7
Al Magaloff

rrMaster

12,199 Posts- Enough​Time Wasted. See Ya!

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Well, you can never hurt a motor with a warm to touch back cover. That is about as fool proof as I can offer. There are some problems with tweaking the high speed needle to achieve the proper headspeed. We generally set the headspeed, by adjusting the throttle curve at 0º pitch and the hover point.

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10-26-2004 12:48 AM  13 years agoPost 8
fullload

rrApprentice

Wichita,Ks

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Missed you on the weekend

Sorry, I missed you guys on the weekend, was pretty busy. What I am looking for is a relative easy way to set the carb. without danger of getting it too lean. When I cooked my engine, it was running pretty well, but I tried to lean the idle [shouldn't a done that LOL] then the main like when flying a plank. The problem was I really didn't know what I was listening for. If we tuned for blade rpm that might be a safe way to at leat get the speed we need till the engine gets broke in and someone with more experience could help.
Is such a thing practical or possible?

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10-26-2004 01:35 AM  13 years agoPost 9
the collective

rrKey Veteran

Bayside, NY, U.S.A

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IT's not practical to try to hit a target RPM by tweaking the needle. You set the RPM with pitch and throttle positions, you use the needles to ensure that the mixture is correct.

It's easy enough to hit a specific RPM with a too-lean OR too-rich engine, so don't bother using RPM as a needle setting guide.

Set the idle needle so that when the engine is idling, if you pinch off the fuel line the engine will run for about 6 seconds or so. IT should speed up a bit in the first second or two, then slow down and die. Then set the high needle to allow a full thropttle ascent with no bogging or leaning out. Then finally check that when you bring the negine backl to idle it comes right down to idle and doesn't hang on the pipe. If it does, you need to enrich the low-end a bit.

It will take time to develop a feel for the full-power ascent test. Too much or too little pitch on top can fool you. Best bet is to find someone who seems to have a good running engine and watch them tune. Asking questions along the way can't hurt.

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10-26-2004 10:13 AM  13 years agoPost 10
Al Magaloff

rrMaster

12,199 Posts- Enough​Time Wasted. See Ya!

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fulload, why not go back and read some of the above posts. You won't get anyone to agree with you on tweaking the needle for blade rpm. Doesn't really matter how many times you ask the same question.

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10-27-2004 01:44 AM  13 years agoPost 11
fullload

rrApprentice

Wichita,Ks

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OK Al

Your right, however, I wasn't trying to convince those of you who have been so good to answer, I was tryingto get other responses also. Thanks, all of you for your input.
I will work with the traditional methods. Thanks again.

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