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HelicopterEngines Plugs Mufflers Fuel › OS 50 and 60K carb
12-22-2003 01:52 AM  13 years agoPost 1
yapjy

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Singapore

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Hi,
I got a spare 60K carb lying around. When my 5 months old OS50 developed a lean problem at the end of the flight, I decided to replace the 40E and give the 60K a try.
Initial flights were powerful, even with the needles at a rich setting. My GY401 will wag the tail during sudden pump of throttle. After some tuning, I get mid needle at 1/2 turn out, and high needle at 1 1/3 turn out. I believed it's still running rich because the backplate is cool to touch and there are plenty of smoke. But the power is excellent.
I have not yet timed the total flight time. The weather is bad and I did not get the chance to fly her around for aerobatics. This OS 50 with 60K is also running with a 60 size KSJ competition muffler.

If you go the cat eye mod, you will not need this 60K. I think a 3 needle carb like the 60K can solve the problem of a lean run near the end of the flight. The original 40E has the problem of a lean mid range because most of us are greedy for power and lean the high needle is little too much. What happens is that in aerobatics when the engine is working at a higher throttle range, the leaner high needle will cause the engine to overheat. The lean mid range doesn't help to cool down the engine either. So I thought a solution is to have a slightly rich mid range to cool down the engine and a slightly lean high needle to squeeze out the power.

By the way, I'm using CP15% and OS#8 glow plug.

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12-22-2003 02:53 AM  13 years agoPost 2
Gearhead

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Vt

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you said your tail kiks when you open the throttle, you will need to use longer/larger tail blades,,,

there are a few of us using the larger 60B carb form the OS61wc on our OS 50, I love mine, it really smooths-out the 50, I had to go with longer tail blades to keep my tail straight...


Jim

Jim
Buzz Buzz Buzz

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12-23-2003 02:11 PM  13 years agoPost 3
Reesy

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In the doghouse ... Nottingham UK

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Hello Yapjy
This is the 60K off the Cspec right?
It's just I've been considering exactly the same idea but was unable to find any info.
The 60K has a very large throat so I was worrying about enough fuel pressure if that makes any sense.

Please keep us informed how you get on.

Paul

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12-23-2003 02:18 PM  13 years agoPost 4
DS 8717

rrProfessor

Here wishing i was somewhere else

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Hello Yapjy
This is the 60K off the Cspec right?
It's just I've been considering exactly the same idea but was unable to find any info.
The 60K has a very large throat so I was worrying about enough fuel pressure if that makes any sense.

Please keep us informed how you get on.

Paul
fettlin' not flyin'
R90 CspecMP2 6000G / R50V2 OS50MP2TJpro csm560m / Voy50 OS50 560m / R50V2 West50H 560/ Logo10 + EoloPro both on LiPo's

NEW 12-23-2003 06:11 AM
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

try it,you can always take it back off. the 60 3 needle carb works ok and it's bigger. DOUG

YOU ONLY LIVE ONCE..IF YOU LIVE IT RIGHT THATS ALL YOU NEED

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12-23-2003 02:37 PM  13 years agoPost 5
yapjy

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Singapore

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Hi douglas,
Yes, 60K is from the OS91-C-Spec.
I didn't notice any problem with fuel issue yet. I will have to fly it more to see how good it is.

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12-24-2003 10:51 AM  13 years agoPost 6
yapjy

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Singapore

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Put in 4 tanks through this combo today. The engine was running ok except that there was a lean run at near the end of the tank. I guess I was abit too greedy for power and leaned out too much on the high needle. On the next flight, I turned out by 2 clicks on the high needle and the lean run was gone.
Flight time on a Sceadu with the bigger fuel tank was about 12 minutes. Headspeed between 1600 to 1800rpm. But that's from 4/5 to 1/5 of the tank.

As for power, the headspeed did not slow down too much in a double roll. Climbout is ok, but less impressive than a 90 size bird.

I guess I need to tweak somemore in order to achieve the so call 90 size heli power on a 50 size ship.

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12-24-2003 12:10 PM  13 years agoPost 7
Reesy

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In the doghouse ... Nottingham UK

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OK so is it better than the stock carb?

I re-modded my cateye the other day, only managed one flight due to weather but it seemed better .. wondering whether to persevre for now but if the 60K is better I'll go that way immediately.

Paul

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12-24-2003 12:13 PM  13 years agoPost 8
yapjy

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Singapore

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It's better in the sense that you do not have to lean out much to get the power. Then engine will still run cool enough and at the same time gives good power.

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12-26-2003 10:07 AM  13 years agoPost 9
yapjy

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Singapore

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Another 4 tanks. No lean run.

Flight time is around 10 mins from 4/5 to 1/5 of the tank.

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12-26-2003 01:25 PM  13 years agoPost 10
Al Magaloff

rrMaster

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

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yapjy, give the UNIFLO set-up a try.

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HelicopterEngines Plugs Mufflers Fuel › OS 50 and 60K carb
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