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| Fixed Wing Discuss fixed wing aircraft. |
Topic Review (Newest First)
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| 05-29-2010 11:55 PM | |
| eastcoast78 |
Re: Piper J-3 Cub O.S.55AX engine ahh cool i was just wondering how easy the fuel gets too the engine.But with my cowling, it covers most of the carb opening..I mean i can see it,but getting my finger in too plug it ant going too happin..I guess ill just have too plug the end of the pipe instead,it'll still create back Pressure.. |
| 05-29-2010 09:44 PM | |
| supercub1974 |
Re: Piper J-3 Cub O.S.55AX engine What works for me is to open the throttle all the way, put your finger over the carb opening and turn it over by hand until you feel the fuel on your finger. Then close the throttle to the idle position and flick it over a few more times, stick on the glow igniter and give it a quick turn over. I always use my hand and it usually starts right away. If not repeat the priming again. Also my engine is side mounted, so if your engine is upright you might not feel the fuel right away. I also noticed that if there is enough fuel you can hear it if you spin the prop back and forth between your fingers. Being an amateur this may not be the right thing to do but it works for me.. |
| 05-29-2010 07:18 PM | |
| eastcoast78 |
Re: Piper J-3 Cub O.S.55AX engine sound good,Glad you got in working order with out that the exhaust restriction.another rule of thumb is always tune from rich too lean,so next tme your going flying.let it warm up for 3-4 mins and lean the HSN till oyu see no more profromance do the pinch test too see if your in the 2-3 sec rev up and die ,and you should be good too go. one way too know if your too lean on the HSN or LSN is if it cuts out(not enough fuel flow.also take notice of the temps outside,if its still abit cool,kepp it on the rich side.But i think oyu know that. Now i have a question,i still havent ran in my OS.46,all my experence with glow engine are on mye RC trucks..but the same princebles apply. How hard do you fine it for Priming your engine?. 
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| 05-29-2010 06:50 PM | |
| supercub1974 |
Re: Piper J-3 Cub O.S.55AX engine Took off the cowl today and played around with the settings a little in my heated garage, too cold to be outside. I started by turning the high speed a half turn and richening it up. Then I removed the restriction I had in the exhaust and it still shut down when held vertical. So then I turned the low speed a little to get rid of that sputter at 3/8 throttle but then it seemed maybe a bit lean all the way through so I gave the high speed another quater turn out and now it runs great. Theres a trace of blue smoke all the way through throttle range and it runs great at all positions and all throttle positions. Maybe before I fly it again i will back out the high speed another quarter turn to make sure its not running too hot before completely broke in. Thanks for the replies. |
| 05-27-2010 11:13 AM | |
| supercub1974 |
Re: Piper J-3 Cub O.S.55AX engine Thanks guys I will tune it when it warms up. |
| 05-27-2010 10:37 AM | |
| chuebner |
Re: Piper J-3 Cub O.S.55AX engine I am running an OS.46AX in my Cub with an unrestricted Slimline Pitts and an OS.55AX in my Funtana 40S with an unrestricted Slimline Pitts, both with tanks at the carb centerline, both run great. Maybe as mentioned earlier, wait till the weather warms up a bit and finetune the needles a bit more. Good Luck Curt |
| 05-27-2010 09:01 AM | |
| supercub1974 |
Re: Piper J-3 Cub O.S.55AX engine Thats lots of info there eastcoast I will wait till it gets warmer and go from there. Thanks I will have to print that off and post it in the garage lol. |
| 05-27-2010 12:10 AM | |
| eastcoast78 |
Re: Piper J-3 Cub O.S.55AX engine From what i can see /hear ,maybe a bit on the rich side,but the temps here in NL are still on the Cool side... Your were saying your about 3 -3.5 turns out on the HSN? Im thinking that's fine for the temps here now,when it warms up around 15-20C i'd start too lean it in.But if shes dieing when vertical your Lean. Have you done any Pinch test on the LSN?,cause if your Rich on the HSN,and haven't adjusted the LSN usually rule of thumb is warm the engine up,Pinch off the carb fuel line ,the engine should run for roughly 2-3 seconds, rev up and die,if it dies immediately your too lean and if it runs for say 4-5 seconds and dies your too rich.Only make small adjustments 1/16th turns would be fine.But always tune the engine as follows... HSN first and then do the Pinch test on the LSN. The HSN and LSN work together. If its hesitating,you Mean boggy when is seems too have no Power? or you mean hesitating too where is seems too almost cut out?,if its on the verge of cutting out,your too lean,and staving the low end of fuel. When going from idle to say 50% throttle ,then i got a feeling its your Low Speed Needle(LSN)It controls the amount of fuel flow from 0%- roughly 40% throttle. Im not sure about Blocking one of the Pitts outlets.Never heard of anyone doing that!.But like flyswatter40 said if it quiets while holding vertical your too lean. Man you got too Love Glow engines  tuning is a art form,but you'll get the hang of it.Im assuming you Ran a few tanks of fuel as per the Manuel(page 27).Leaning it out for 10 seconds till a 4 stoke note and then back and forth for the 1-2 tanks of fuel? During subsequent flights, the needle-valve can be gradually closed to give more power.However, if the engine shows signs of running too lean, the next flight should be set rich. After a total of ten flights, the engine should run continuously, on its optimum needle-valve setting, without loss of power as it warms up. After the completion of the running-in adjust the carburetor at optimum setting. But as i was saying its still Cool here ,Id wait till it warms up abit before making any Major Carb adjustment. For now un-block the Pitts outlet,Rich-en the HSN it till it doesn't die when held vertical,get the engine warmed up do the Pinch test and go form there. Heres a pretty informative link. http://www.hooked-on-rc-airplanes.co...ning-tips.html Hope i'm not too confusing, do i have too Drive too Glenwood too Tune your Engine for yea ...lmao. WAIT!!!What am i talking about!!,Ive never Run in a Glow engine before 
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| 05-26-2010 06:43 PM | |
| supercub1974 |
Re: Piper J-3 Cub O.S.55AX engine Thanks, That was just some kid that came running when he heard the plane start up lol. I do have a nine year old daughter but shes more into build a bears and dolls right now, although I do have the mini super cub waiting for her. I have the tank positioned so that the middle of the tank is about to the top of the inlet of the carb. Since restricting one pipe the vertical problem has pretty much stopped. I have about 3/4 of a jug of fuel used with only 3 tanks of it in flight. How long before it should be broken in? |
| 05-26-2010 06:01 PM | |
| Guest |
Re: Piper J-3 Cub O.S.55AX engine note I have that engine and it takes a long time to break in once its done it runs very nice. I liked your video and your son seems a little nervous with your flying..... pm me if you need more help. |
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