OS 95 AX
 

Maidened my aeroworks 260 edge today with my 95ax in it and the first flight was great needed a little up elevator and it flew like a charm rolls loops anything i wanted to do then landed and filled back up took off again and flew maybe a half of a tank at half to 3/4 throttle when i opened it up it died,i leaned it a few clicks and flew it and it flew great and all the sudden it died like you shut it off! i had it tuned the nite before where it seemed about perfect I came home and checked the fuel lines and head bolts and they were all fine . any suggestions what i should do now?

RE: OS 95 AX
 

How many tanks of fuel through the engine?? Is is still new???

Ken

RE: OS 95 AX
 

Could it be too lean and getting hot? Do you have enough airflow through the cowl? I'd be sure to run it on the rich side, especially if it is new. How's the glow plug?

RE: OS 95 AX
 

this is the 6th tank i did the pinch test and the nose up test it seemed fine but i didnt check the plug yet

RE: OS 95 AX
 

SInce it's fairly new keep it running rich. Don't start trying to really lean it out until you have 15-20 tanks through it. OS engines are great and run almost right out of the box, but you still need to "baby" them a bit while they finish breaking-in. Keep it rich so that you see a smoke trail when running and you'll be fine. Once you get to about 15 tanks then start leaning it out a bit at a time. You may have to readjust the low end as well.

Ken

RE: OS 95 AX
 

This is especially true inside a cowl. I know guys who try to squeeze every last RPM out of an engine. It may work out in the open where there is good air to keep it cool but not inside a cowl. I had a similar problem with an OS .81 4-stroke. A few clicks richer and a larger cooling air exit cured the problem and it was a powerhouse after that.

RE: OS 95 AX
 

What prop and fuel are you using?

RE: OS 95 AX
 

i have a 95ax and the first couple of flights ended in deadstick when opening to full throttle as well. Keep it set slightly on the rich side on the high end and use an OSF plug. The #8 plug was not hot enough. Also do a bench test with WOT and hold the plane in different roll and pitch variations (nose up and down) to make sure it doesn't die on you before flying. I do this before my first flight EVERY time I go to the field. After you have a gallon or two through this engine, you'll LOVE it.

RE: OS 95 AX
 

Hi y'all,

I'm sorry, I don't wanna take over this thread but just wanna ask something. After successful broke-in and 15 to 20 tanks have been run through rich setting is it necessary to lean out the engine? If we lean the engine out, won't it be running hot and lower rpms, why not continue to run on rich. I'm talking about .46 to .90 size two stroke engine. Once again sorry did not wanna take over the thread just wanna know about the settings why lean out why not rich settings?

Thanks

Mody

RE: OS 95 AX
 

The terms rich and lean mean different things to different people. It even depends on the construction of the engine in regards to the piston and sleeve technology.

Rich for a ABC type of engine (tight pinch at the top of the stroke) means running in a 2 cycle as slow as possible while still maintaining a 2 cycle setting. However after break-in, you will lean it out slightly for more power.

Rich for a ring type engine means that you want to run it in with a 4 cycle operation initially, then fly it where it is breaking back and forth between 4 cycle to 2 cycle. The break-in is helped with modest acrobatics (Loops or Cuban eights only, not prolonged climbs), so the engine goes back and forth between rich and leaner operation in the air.

In either case you want to stay on the rich side of the peak needle setting for long engine life. If you can reach the fuel line, a brief pinch of the line should speed up the engine rpm at full throttle. If the engine sags when this test is done, you are too lean to fly. When you can't do this test, then the engine should pick up a bit of rpm when the nose is held vertical. Best to test this with less than half a tank of fuel. But the pinch test works the best.

One question that is seldom covered is engine type for the type of flying you plan on doing. If you are going to bore holes though the sky at high speeds, then the ABC types work best. If planning on running at low power settings, then ring engines work best.

RE: OS 95 AX
 

havnt been able to fly for a month or so because of work, but finally got back out tonight and richened up my 95 ax and took it up, it flew about 30 seconds and died in flight it nosed dived in and tore the landing gear and broke the engine mounts .....its repairable but is gonna take some time! i believe it must be getting to hot in the cowl ,my question now is how or where do you start cutting on the cowl to get more air?

RE: OS 95 AX
 

armody- what the "leaning out" advice you are hearing really means is setting the engine mix to the proper ratio for best horsepower. Glow engines need to run rich for break in so that they don't overheat or wear excessively before the parts burnish themselves together. Once that process is complete though, there is no reason to keep running rich. It wastes fuel, hurts your throttle response, and cuts horsepower. Most guys will run their engines a few clicks rich in order to avoid an over lean condition.

joco1- 3 to 1 odds you're too lean. Use the #8 plug (what the engine was designed for) and tune it so you get an obvious increase in RPM when you pinch the fuel line at WOT, then tune the bottom so that it idles and transitions well. After about 15 tanks of fuel, go to the HSN setting that gives you just a slight increase in RPM when you pinch.

RE: OS 95 AX
 

i might be, but i tuned it on the ground for about a half hour before i flew and i let it run about half throttle and would run it up and it would die, so i kept tuneing until it would run up without choking out,it seemed to be running great on the ground but obviously it wasnt!

RE: OS 95 AX
 

ok i got my plane back together and tuned it on the stand tonight ,i did the pinch test,and then i held the plane up ,down ,sideways and level and it ran perfect never choked or gurgled one time ! So tomorrow nite i plan on doing the same with the cowl on and see how it runs. is there anything else i should check before takeing it up again and if its going to get too hot in the cowl will it do it on the ground the same as it would in the air?

RE: OS 95 AX
 

Yes, you should be able to tell if there's going to be an overheating problem on the ground. Just don't forget that the engine will run a touch leaner in the air.

RE: OS 95 AX
 

Has anyone suggested checking the fuel lines and the tank and does it have a pitts style muffler? There are a number of variables here that need to be addressed. Another penny and a half for thought [X(]

RE: OS 95 AX
 

i have the regular muffler that came with the os95ax on it.

RE: OS 95 AX
 

One way to see if it's a heating problem is to take the cowl off and fly it that way. If it still quits, then you know it's probably not a heating problem, but more likely a fuel flow issue.

CGr.

RE: OS 95 AX
 

was wondering about that cg ,but wouldnt a fuel flow problem show itself while i was holding the plane up and at different positions? i cut alot bigger hole in the cowl so hopefully it will cure my problems!

RE: OS 95 AX
 

Well, it sort of depends on your experience with tuning and "listening" to the engine. It's one of those things that you pick up from doing it a bunch of times. If it quits without the cowl, well, you can just about eliminate heat as your problem. Then it may come down to closely looking over your fuel system to make sure you don't have a small leak or any other problems, and then asking someone with experience to tune your engine for you to see if it quits again. If not, then, well, you will need to work on the tuning process.

Regarding the hole in the cowl, I think the exit hole should be about twice as large as the inlet hole (for air circulation over the engine).

Hey, I have been flying for several years now and I still have an occasional dead-stick that I can't attribute to anything but my tuning process.

CGr.