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HelicopterMain Discussion › OS 50 carb
04-26-2002 03:00 PM  15 years agoPost 1
Malorie

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Paw squared, MI

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Does anybody know of a good carb to replace that silly stock carb that is on the OS 50?

I've heard of some people putting the OS 60 three needle carb on it with great success. Is this true? I really could use a solution to this one, 'cause my mid range is lean and both high and low are rich and I can't seem to tune this out with that dumb carb.

Thanks in advance,
Mal'

P.S. Overall, I'm quite satisfied with the way the motor runs, as is typical with OS. It's just that darn mid range lean thing I hate.

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04-27-2002 08:12 AM  15 years agoPost 2
FlyinBrian

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USA

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Hi,

I believe the sxh wc carb (60b I think) will fit if you remove the insulator, I measured my new os50 and 60b I had handy at the time and as best I could tell it would go in there but I really was'nt willing to remove the insulator to find out for sure.

For some reason this motor trashes plugs quick while its breaking in. If you have'nt done so allready try a new plug out and putting the low-end back where the instructions show it.

Try some different fuel's, plugs and exhaust extensions. Little things can make a big difference in the way the motor runs. Byrons 20/20 has worked well for me but byrons 15/20 showed the same problem your describing.

On a os#8, 20/20 and gr8 lakes 50 muffler I ended up at 1 1/2 on the hi side (still a little rich) and the idle is in the middle.

If its a raptor try tightening up the belt, dont have an idea why it helps but it does.

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04-27-2002 03:53 PM  15 years agoPost 3
Malorie

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Paw squared, MI

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I've been running this engine on my Bergen Intrepid 46 for over a year now. I've used various plugs, and fuels. Again, overall it runs great, just a bit lean in the middle in all situations. I'm just a bit tired of all the tweeking, trying to get rid of the dry middle. Appearently I'll have to do my own experaimenting or just live with the poor mid-range response.
Thans for the response,
Mal'

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04-27-2002 03:56 PM  15 years agoPost 4
squirrel

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South Whitley, IN

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Well, I feel a little better that some one else thinks the 50 is Junk out of the box. Mine is terrible also, this will be my last OS. All the hype about this engine being so good makes me believe they changed something. I think since the founder of the company passed they lost their focus on a smooth running engine. I hate to say this but the Thunder Tiger 36 despite its problems ran alot better than this OS 50, and that is a crying shame. If a new carb fixes the problems please email me with what you did.

squirrel

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04-27-2002 04:12 PM  15 years agoPost 5
bxc53

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Directly over the center of the Earth ( 98223)

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OS 50 tuning

There are several OS 50 powered helis in my flying club, including mine.
Here are some things we found in general:

The engine needs more break-in than the typical OS before it gets consistant.

Mine and at least one other had symptoms similar to yours and after a lot of fiddling, I tore the carb apart to find a small black chunk of cr*p!. It tuned and ran fine afterward. Similar chunk was found in the other one as well We assume they were there from the factory.

Restrictions in the fuel delivery system make the engine touchy to tune. Check your fittings, fuel filter and if running a header, ream out the inlet fitting to make sure it's not restricting the flow.

We have a good variety of mufflers and fuel used, but the "low speed" adjuster is almost always within a few degrees of the center when the final tuning is done. Main needles range from anout 7/8 turns to 2 turns depending on fuel and muffler.

For whatever reasons, everyone in the club uses Coolpower. The 50's are running fine on 15%, 30% and the 50/50 swamp mix.

Muscle pipes are popular, but mufflers sized for the 50 work fine also. Older '46' sized mufflers will make it harder to tune and reduce power.

I hope some of this helps.

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04-27-2002 07:25 PM  15 years agoPost 6
fitenfyr

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Port Orchard, Washington

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OS 50

Brian is right. The engine takes a little longer to break in. Mine has about 1 1/2 gallons through it and is very consistant (just starting to get a greenish/brown tint to the piston). Only have to tune for different air temps.
I am running CP 15% and a 60 sized muffler. Very quite and really runs well.

Jason

Jason Stiffey
Fly Fast....Live Slow...

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04-27-2002 09:45 PM  15 years agoPost 7
MitchD

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Antioch TN USA

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Malorie
I got rid of the "midrange blues" by running the low end "fat",then compensated by adjusting the needle valve accordingly.
It was a back and forth effort getting it right, but it runs very smooth.
Thats running it on CP 30,with a M Pipe.
I'm not a big fan of the carb design either,but found the low end mixture screw is very sensitive,on the 50 and the 91(same carb design)and needs to be adjusted in tiny increments,again w compensation on the needle.Was contemplating testing the 3 needle carb, but spent more "quality time" tuning and got it where I wanted.
Exhaust does make a big difference,the 50 loves to breathe,anything 50 and 60 size works.

Have Fun!

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04-28-2002 01:04 AM  15 years agoPost 8
charly

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xenia, ohio

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Another thing we found that will complicate the settings is the size of deflector. On mine we found the deflector was just a bit smaller in dia., causing the lo end to stay rich. The deflector I'm using now is about an inch longer but a bit larger in dia. I'm running byrons 20/20 ys mix fuel and the lo end is just on the rich side @ a few points to the right past centered and the hi needle about 1-3/8 to 1-1/2 turns out. I get aprox 10-11 min's of run time around 1600 rpm and use an os8 plug and a G8lakes muffler.
Like Auger said the little things can make a significant difference.

charly

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04-28-2002 08:28 AM  15 years agoPost 9
Itsindilas

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Greece-Athens

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Guys, I have jut ordered an OS 50 to replace my OS 46 in flying my GPH 346 SE. I faced similar problems with my OS 46. In some points of the throttle range (althought the carb is modificated) the engine was running lean. So, I decided to install a servo in the empty Rudder servo position in order to control the needle through the inflight mixture control function, provided by the GV-1 menu.
Unfortunately there were no available inflight mixture control needle for the 46, so I had modified my needle in order to be controlable. (I have available photos if you like itsindilas@hotmail.com)
I have a GV-1 and its menu provides you a 9-point curve. So, I set up the curve points needle settings to correct the lean running in midrange.
EXCELLENT results. Moreover, I am able to trim the higher side of the micture curve by a VR switch.
For those of you running a GV-1, find an empty servo and plug a servo to control mixture while being in flight. For the OS50SX-H there is one inflight mixture needle available in the market and I placed it in my order.
BTW you don't need a spare channel to use this function. The GV-1 does it all alone. You need a spare channel only if you wish to use the MIXTURE TRIMMING feature (I use AUX5 for this). Setting up the mixture curve is not something difficult. .You have just to assign a needle setting for each one of the nine throttle curve points. If you have one of the new Futaba radios you can do it through the radio software by turning the GV-1 to DIR, if you have a JR system or older Futabas then you can do it very easy though the GV-1 menu by turning the GV-1 to GOV.
Suppose that you run then engine with the needle set at 1 and 1/4 turns and in the midrange the engine runs lean. Then you go to the 5,6,7 points and lean it 2 clicks. After flying you can proceed with furthermore fine tuning.
For you having a GV-1 don't lose time. Install a servo and order an inflight mixture needle valve.

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04-28-2002 04:56 PM  15 years agoPost 10
Malorie

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Paw squared, MI

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Thanks for all the response guys!
Being a rainy day here in MI, I will try a few of your suggestions. (Disassemble the carb, etc...)
I will say it again though, I have been running this motor for over a year now, so I think it is well past any breakin problem. Don't get me wrong, I love this motor, it always runs and smoothly. I just think that the carb design is a poor design and far too picky about settings. I think that you should be able to tune a motor in without all this messing about.
I just changed back to Cool Power 30% after flying 15% for the last season and my 60wc tuned right in and that darn 50 is a bunch of fussing trying to get that lean mid out of there.
I guess I'm just frustrated, but I'll work it out today or die trying.

Thanks again guys,
Forever tweeking my 50,
Mal'

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04-29-2002 01:26 PM  15 years agoPost 11
Malorie

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Paw squared, MI

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So far I have found no problem with any gunk in the standard carb. I had a 60b carb laying around and decided to try it on my 50. From the look of it the throat is the sam size as the standard one on the 50, and it bolts right in place. I never got a chance to run the engine yesturday, GRRR .

I'll be testing it out tonight, and I'll report my findings tomarrow.
Later,
Mal'

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04-29-2002 11:48 PM  15 years agoPost 12
Malorie

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Paw squared, MI

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IT WORKS!!!

I just got done testing out the 60b carb on my OS 50 and after two tanks of fuel in 30mph wind I've decided that it works nicely. For the first time scince I've had my 50, I actually got it to be blubbering rich in the mid-range.

I would definately say that the 60b carb did the trick. It bolted up like it belonged there and tuned in just as nicely. Now I get to redo my pich curves so that I am no longer compensating for a lean mid-range.

I'm in love with my Intrepid 46 all over again. Boy will my boyfreind be peeved.

HAPPY FLYING ALL ,
Mal'

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08-05-2002 10:54 AM  15 years agoPost 13
Zach Sparks

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Norton Shores, MI

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.

..

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08-05-2002 01:07 PM  15 years agoPost 14
Malorie

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Paw squared, MI

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Yes I am still running the 60b carb on my 50. It seems to work pretty good. Or should I say that I have not seen any adverse effects of using it. The mid range problem was cured but the 60b carb. I have not been running my 50 all that much this summer so I haven't had a lot of time to really make a thurough study of how it has effected the performance. I noticed that the 60b carb does act rich with the mid-range needle closed. I had to fiddle around a bit to get it set just right. When I need to make the weather adjustment I usually just have to tweek the high needle a bit.

I hope this helps,
Malorie

Life's a journey, NOT a destination.

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08-05-2002 03:38 PM  15 years agoPost 15
JJsaratogaNY

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Centreville, Virginia

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can I ask you a peronal question?

how did you get into R/C heli's?? You are the fisrt woman I have ever heard of who fly's heli's. I am really curious. Don't get me wrong, I am thrilled to death that you do fly, I am just surprised.
By the way, I also have a new OS50, and I am going break it in on the bench. everything i have read so fatr, indicates an unusually long break in time.

uuuggghh! I'm getting sucked backed in again...

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08-05-2002 04:39 PM  15 years agoPost 16
Malorie

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Paw squared, MI

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No you can't ask.

Just kidding. I just always wanted to fly these things, I realy don't know why, with all the frustration of parts breaking and stuff. I guess I just like it for the same reasons most of you guys do. My mother always encouraged me to do what I like dispite stereotypes. So here I am and I love it.

I never had any unusually long breakin period with my 50, it seemed normal to me.

Later,
Malorie

Life's a journey, NOT a destination.

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08-05-2002 04:46 PM  15 years agoPost 17
w.pasman

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Netherlands

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Strange, on my OS50 the low part of the midend is very rich instead. I have to pass through a very rich point before the hovering speed is reached. Sometimes the engine is even unable to get through that point and then I have to lean out the engine a little, which can cause some lean effects at the hover point. Or is that what you refer to as 'lean midend'?
I have the carb with the two screws on the same side, as on my page

http://www.cg.its.tudelft.nl/~woute...age/raptor.html

(I have seen another one in the OS catalog).

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08-05-2002 04:53 PM  15 years agoPost 18
Malorie

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Paw squared, MI

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Yes, that carb gave me the same problem. I could not get the mid range to lean out without making the top and low terribly lean.

I just looked back at my posts from earlier and I guess it was going lean in the mid-range. All I know is it tunes in nicely with the 60b carb.

Life's a journey, NOT a destination.

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08-05-2002 05:11 PM  15 years agoPost 19
daveblazer

rrApprentice

joliet il

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os 50 is the shit !!!!

i have an os 50 and i think it's the best motor out i was runen a thunder tiger 36 pro and u wanna talk about not geting it tuned right that's a moter w/ problems im my opinion if u cant tune this motor then there's somthing wrong w/ the carb # 1 before u even think about starting the motor up take the entire thing apart and CLEAN it out theyhave shaving's in them there not to clean w/ the machineing proscess i found a shaving in the needel valve of mine and thank god i check other wise i would never have been happy w/ this motor my self!!!
other then that it broke in well and i have 5 gal in it already and it's runen great. what kind of pitch's are u runen on ur hi end jus woundering im runen 12.5 degreass pitch at 1900 rpm and it still turns like a banche!!!!

sceadu 50
os 50
nhp 600 blades
w/ a gv1
centry mufler

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08-05-2002 05:54 PM  15 years agoPost 20
NEM3

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New Lenox, Il

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Its not a Century anymore.

Its a Nick modded HHI KSJ 60 size copy.

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HelicopterMain Discussion › OS 50 carb
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