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HelicopterBeginners Corner › OS 50 Hyper Question???
02-15-2011 11:39 PM  6 years agoPost 1
nrad2000

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USA

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I've had this Century Helicopter for 4 years now. With an OS 50 hyper - when I idle up and get the head speed going and when I bring it back to idle down the RPM drops. Thats normal. well today, the RPM dropped and then in a few seconds I can hear the engine slowly accelerating again. Could my clutch be going bad? would a bad clutch do that? Stupid me I forgot to turn on the receiver and when I tried to turn on the engine it was at full throttle. the engine came to life at full throttle - holding onto the head I pulled the fuel line to the carb. Just wondering if I was to burn out my liner would the engine behave that way?

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02-16-2011 04:47 PM  6 years agoPost 2
BarracudaHockey

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Jacksonville FL

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No, chances are you have something obstructing the fuel line or an air leak somewhere.

Andy
AMA 77227
http://www.jaxrc.com

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02-16-2011 07:43 PM  6 years agoPost 3
wifeorheli

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reno, nevada usa

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+1 barracuda/ I would inspect you liner aside from your problem anytime you have a hot start.

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02-17-2011 02:19 AM  6 years agoPost 4
rotormonkey

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Ottawa, ON - Canada

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Generally if you screw up your liner from a hot start, the liner ends up jamming up all over the place in the clutch shoe. It's pretty obvious that it's destroyed because the blades will want to spin when you turn the motor over with the starter, and it'll grab like hell even at idle.

Even if you just rubbed it away, which is doubtful, when you went to go from low RPM to high, you'd hear the motor revving like crazy, and no headspeed along with a pretty obvious noise.

I'm a bit of a scatterbrain, so I know burnt clutches
Doesn't sound like the clutch.

Like BH said, it's most likely an airleak or something wrong in the fuel system.

If it can't hover, it ain't worth flying.

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02-17-2011 03:07 AM  6 years agoPost 5
nrad2000

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USA

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I switched out all the fuel line inside and outside the tanks. All the filters are clean. I did go thru the clutch and found a lot of clutch dust accumulated inside the bell. I removed the old lining and replaced it with a new one. I placed a thin piece of paper between the liner and the clutch shoe so while the epoxy is drying it would create a tiny space. well, after curing i tried spinning the clutch shoe and it seems to grab at certain spots. You guys think it would rub off during use or is that something I need to fix before I even try to start the engine? When I turn the blades back ward it grabs.

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02-17-2011 04:33 AM  6 years agoPost 6
bigdog714

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Rochester, MN U.S.A.

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That's a judgment call on your part, so use your starter and turn the motor over, don't start it, just crank it, and see how it feels. If its not too tight fly it, it will settle in! It's not always the liner, the clutch may be a little out of line, or the bell housing may be a little off. You can tell by messing with it, turn the motor a little and see if the main gear turns easily, keep trying it and see if there is a free spot, then you know its an alignment issue and not the new clutch liner. Then go fly it, it won't bite, not hard anyway!

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02-17-2011 05:32 AM  6 years agoPost 7
nrad2000

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USA

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cranked it with the starter a few times. that settled it in quick. once the weather clears up I'll give it a try. Oh, last question: my exhaust pipe pressure nipple stripped. what is the best way to fix it?

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02-17-2011 01:44 PM  6 years agoPost 8
BarracudaHockey

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Jacksonville FL

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JBWeld (that and duck tape can fix anything )

Andy
AMA 77227
http://www.jaxrc.com

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02-17-2011 03:01 PM  6 years agoPost 9
bigdog714

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Rochester, MN U.S.A.

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JBWeld is not bad, look at Locktite stuff, usually you can find a good selection at the auto parts store or Ace Hardware, they made a product called Quick Metal that was awesome for striped threads.

The other option would be to look at some after market taps, some of them have a larger tap so you can re-thread the hole to a larger size.

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Ballistic 700
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02-22-2011 02:10 AM  6 years agoPost 10
nrad2000

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USA

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fixed the muffler.

I filled the tank to half. Did real simple figure 8's and hover. watched the fuel tank. 1/8 tank the engine pitch started to increase again. I'm only hovering. setted her down. Tried refueling and this time I tried fueling to full tank. Right above half tank I saw fuel beginning to go into the vent line and into the muffler. Ok, maybe the vent inside the tank is pointing down or side ways. I can correct that. I flew her again, and again at 1/8 tank the engine started to increase in pitch sound. it sounds like it is leaning out. I can tell the RPM is increasing. I changed out all the fuel lines and even the line inside the tank. the clunk is perfect. the fuel filter is perfectly clean. The only thing that I did not check is the brass fuel line inside the tank. But what would that do? It's working perfectly betweeen half tank and 1/8 tank. I noticed when I was pumping out the remaining fuel that it started to draw fuel from the 2 oz header tank and not from the main tank (at 1/8 tank). I tipped the heli on its tail so that it's pointing up and the fuel from the main tank finally began to empty. I don't get it.

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02-22-2011 03:31 AM  6 years agoPost 11
Ladymagic

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South Korea

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Normally, in a situation like this, I'd point you to your fuel filter being clogged or dirty....or your fuel pick up line being too soft and collapsing under pressure, but since you say you checked your filter and fuel lines and it's all good, so I'd check your carb for dirt. Even a small partical can mess up an otherwise perfect fuel mixture setting.

If you haven't already done so, I'd remove the carb and needles, get some compressed air, q-tips and alcohol and go at it. You can even soak the carb in the alcohol for a short while without damaging it to help break up any crud that might be lodged in the spray bar and then blow it out/dry with the compressed air. (just take off any gaskets and o-rings first, the alcohol will dry them out. ) Also, wipe the needles down and check the o-rings for dry rot or cuts. You should also check that the carb is fully seated on the engine case and the o-ring is there and in good condition. I bet that'll get your engine running normally again. You say it sounds like it's leaning out. Have you checked the temp? Is it running hotter than normal? Doesn't sound like a mechical problem but, it sounds like your engine is getting more air than it needs from somewhere. Good luck and I hope you get that knocked out soon

If you are drawing from the header tank before the main tank is empty is could be that you aren't generating enough back pressure from the exhaust. That leads me to believe you have an exhaust leak somewhere. You might have a leak somewhere in the main tank so check for leaks usually near the plugs and nipples. I'd pull the tank, air it up, and listen for the hiss.

Mellisa

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02-22-2011 01:09 PM  6 years agoPost 12
BarracudaHockey

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Jacksonville FL

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How about the rubber stopper?

I agree, leak check the tank.

How does the fuel look while you're hovering? Are you getting foaming? If so you might have a high speed vibration (clutch, fan, tail rotor) thats causing the fuel to foam.

Andy
AMA 77227
http://www.jaxrc.com

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02-22-2011 02:56 PM  6 years agoPost 13
nrad2000

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USA

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I'll look at the rubber stopper tonight and everything else associated with the main tank.

can't see the fuel in the tank - vision not that great. Looks green but thats it.

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02-23-2011 10:25 PM  6 years agoPost 14
nrad2000

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USA

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I found a slit up the brass pickup tubing inside the tank. I'm guessing the fuel wasnt going up thru the end but thru the sides of the brass tubing. Also, the vent (for some reason) was pointing side ways - not up). I fixed those problems and the fuel is now flowing nicely in and out of the tank.

Question: can running the OS 50 hyper too rich cause the glow plug to fail and not work anymore? I was hovering about 8 - 10 feet watching the fuel tank. I did some simple quick pull outs and back to hover. I was also flicking the switch to idle up and idle down during hover. I then saw a large plum of white smoke and the engine quit. Landed. looked at the glow plug - and the glow plug looks good (new). But, attaching it to the igniter and there is no glow. The piston looks good. The ring looks good. Oh, the ring is brand new - I was trying to break in the ring with a rich setting. And, the glow igniter is good - tested it on another glow plug.

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02-23-2011 10:54 PM  6 years agoPost 15
CX1

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Canada

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Century helis don't have clutch alignment problems so you can rule that out.
when you say 1/8th of tank? " do you mean when there is 1/8th left remaining or 1/8th used.

glow plugs burn out when you run lean
if your running to rich you can cool off the plug so it flames out
but the plug should still be ok

adjust your needles at half tank

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02-23-2011 11:09 PM  6 years agoPost 16
nrad2000

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USA

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1/8 left in the tank.

Glow plug looks shiny - i don't see a break down the coil. I connect the glow igniter and the igniter (battery casing) becomes warm quickly.

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02-24-2011 12:05 AM  6 years agoPost 17
CX1

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Canada

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when the tank empties it is normal for the engine to lean out.
that's why it is recommended to tune at 1/2 tank

remove the glow plug and connect it to glow driver, it should glow a nice bright orange

also make sure glow driver is charged when testing

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02-24-2011 05:41 AM  6 years agoPost 18
stargazerww

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parkside, pa.

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i just had a similar situation with my rapter 50 turned out to be the main tank had a leak it was the little pegs that stick out of the tank had rubbed off and made a air hole...pull the tank and pressurize it with air under water and you might see a air leak...good luck

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HelicopterBeginners Corner › OS 50 Hyper Question???
03-03-2011 07:39 AM  6 years ago •• Post 19 ••
nrad2000

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USA

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The pick up brass tubing in the main tank had a slit from the tip all the way to the rubber stopper. I replaced all the brass tubing and all the fuel line. I haven't tested the (dunk it in the water) air leak test. too lazy. If this doesn't work I will do the dunk test. Anyway, once Local Hobby Shop carries OS #8 glow plugs - i'll give it another try. The tank now empties and fills normally.

Would an OS A3 glow plug work fine for the OS 50 hyper. I have one in hand right now? using Cool Power 15% Heli fuel.

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03-07-2011 01:13 AM  6 years agoPost 20
sonnyhad

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Holland,Mi

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I didn't see where you mentioned a header tank. Do you have one? If not, then that's what the problem may be. For some reason an OS 50 seems to know that you are running low on fuel and starts to run lean, with a header tank it always see's a full tank of fuel. It must be a pressure thing. Anyway when the engine runs lean it will pick up rpm's and sound different.

Bald Pilots usually wear hats!

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HelicopterBeginners Corner › OS 50 Hyper Question???
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