O.S. 46 AX oil in muffler after flying
04-22-2013, 12:28 PM
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O.S. 46 AX oil in muffler after flying
Is this normal? I have a O.S. 46 AX II on a pulse XT 40 with a hobbyco exhaust extender. After flying, the muffler has about a teaspoon of oil in it that I empty by holding the plane vertically. Some information that may be helpful: 1) the powerbox muffler exhaust nozzel is at the 45 degree up position; 2) the hobbyco exhaust extender is also at the 45 degree up position; 3) the engine is perfectly tuned and is running rich of peak by 300 rpm; 4) I normally fly at about 1/2 throttle most of the time.
would oil in the muffler be reduced by rotating the powerbox muffler exhaust nozzel 45 degrees down; or, by not using the hobbyco exhaust extender? both of these options would result with more oil on the wing, but I'm willing to do this if it results in fewer engine problems.
Thanks,
Paul
would oil in the muffler be reduced by rotating the powerbox muffler exhaust nozzel 45 degrees down; or, by not using the hobbyco exhaust extender? both of these options would result with more oil on the wing, but I'm willing to do this if it results in fewer engine problems.
Thanks,
Paul
04-22-2013, 12:50 PM
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RE: O.S. 46 AX oil in muffler after flying
ORIGINAL: bugdr
Is this normal? I have a O.S. 46 AX II on a pulse XT 40 with a hobbyco exhaust extender. After flying, the muffler has about a teaspoon of oil in it that I empty by holding the plane vertically. Some information that may be helpful: 1) the powerbox muffler exhaust nozzel is at the 45 degree up position; 2) the hobbyco exhaust extender is also at the 45 degree up position; 3) the engine is perfectly tuned and is running rich of peak by 300 rpm; 4) I normally fly at about 1/2 throttle most of the time.
would oil in the muffler be reduced by rotating the powerbox muffler exhaust nozzel 45 degrees down; or, by not using the hobbyco exhaust extender? both of these options would result with more oil on the wing, but I'm willing to do this if it results in fewer engine problems.
Thanks,
Paul
Is this normal? I have a O.S. 46 AX II on a pulse XT 40 with a hobbyco exhaust extender. After flying, the muffler has about a teaspoon of oil in it that I empty by holding the plane vertically. Some information that may be helpful: 1) the powerbox muffler exhaust nozzel is at the 45 degree up position; 2) the hobbyco exhaust extender is also at the 45 degree up position; 3) the engine is perfectly tuned and is running rich of peak by 300 rpm; 4) I normally fly at about 1/2 throttle most of the time.
would oil in the muffler be reduced by rotating the powerbox muffler exhaust nozzel 45 degrees down; or, by not using the hobbyco exhaust extender? both of these options would result with more oil on the wing, but I'm willing to do this if it results in fewer engine problems.
Thanks,
Paul
04-22-2013, 12:58 PM
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RE: O.S. 46 AX oil in muffler after flying
You made me laugh about flying inverted. I'm just getting started on aerobatics but I'm sure you're right. A few cuban eights would certainly clear out the oil. I'll try the 45 degree down position and see if that helps. the oil is only a problem if I forget to empty it out of the muffler and then carry the plane into the house on its side forgetting that there is oil dripping out of the muffler.
thanks,
Paul
thanks,
Paul
04-22-2013, 01:53 PM
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RE: O.S. 46 AX oil in muffler after flying
It's pretty normal. Better rich than lean - if engine performance is good, leave it alone. One thing you can do is make a plug for the muffler - but put something like a "remove before flight' tag on it so you remember to take it out - unfortunately that comes from experience.
A drastic but nice fix is to relocate the engine so the muffler comes out the bottom/center of the plane, or as close to it as you can. There will be less oil remaining in the muffler, but could result in oil dripping out slowly (like at home). Less to clean up at the field.
A drastic but nice fix is to relocate the engine so the muffler comes out the bottom/center of the plane, or as close to it as you can. There will be less oil remaining in the muffler, but could result in oil dripping out slowly (like at home). Less to clean up at the field.
04-23-2013, 04:43 AM
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RE: O.S. 46 AX oil in muffler after flying
Here is a picture of my Pulse XT 40 with the muffler and exhaust extender. Note: the powerbox muffler could be rotated counterclockwise 90 degrees to help oil exit from the muffler (the extension could then be pointed slightly down too. This might result in much more oil on the wing though.
04-23-2013, 05:10 AM
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RE: O.S. 46 AX oil in muffler after flying
ORIGINAL: gaRCfield
A drastic but nice fix is to relocate the engine so the muffler comes out the bottom/center of the plane, or as close to it as you can. There will be less oil remaining in the muffler, but could result in oil dripping out slowly (like at home). Less to clean up at the field.
A drastic but nice fix is to relocate the engine so the muffler comes out the bottom/center of the plane, or as close to it as you can. There will be less oil remaining in the muffler, but could result in oil dripping out slowly (like at home). Less to clean up at the field.
I would rotate the engine mount 90 degrees or so and get a new cowl, cut it for exhaust out bottom and as needed for head and or glow plug. You would also need to provide access to needle and possibly need a needle valve extension through the cowl.
04-23-2013, 05:39 AM
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RE: O.S. 46 AX oil in muffler after flying
That's a little too much work for me to reduce oil on this plane. Besides cutting a new cowl, and remounting the engine, I would also need to move the throttle servo.
On my next project I think I'll look at getting a DLE 20cc on a Pulse XT 125, and mount it inverted so the exhaust exits through bottom.
Thanks for the advice.
Paul
On my next project I think I'll look at getting a DLE 20cc on a Pulse XT 125, and mount it inverted so the exhaust exits through bottom.
Thanks for the advice.
Paul
ORIGINAL: daytonarc
+1
I would rotate the engine mount 90 degrees or so and get a new cowl, cut it for exhaust out bottom and as needed for head and or glow plug. You would also need to provide access to needle and possibly need a needle valve extension through the cowl.
ORIGINAL: gaRCfield
A drastic but nice fix is to relocate the engine so the muffler comes out the bottom/center of the plane, or as close to it as you can. There will be less oil remaining in the muffler, but could result in oil dripping out slowly (like at home). Less to clean up at the field.
A drastic but nice fix is to relocate the engine so the muffler comes out the bottom/center of the plane, or as close to it as you can. There will be less oil remaining in the muffler, but could result in oil dripping out slowly (like at home). Less to clean up at the field.
I would rotate the engine mount 90 degrees or so and get a new cowl, cut it for exhaust out bottom and as needed for head and or glow plug. You would also need to provide access to needle and possibly need a needle valve extension through the cowl.
04-23-2013, 09:26 AM
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RE: O.S. 46 AX oil in muffler after flying
ORIGINAL: RC_Fanatic
Use a foam ear plug in the muffler exit (after flying, of course!) to keep the oil from dripping everywhere.
Use a foam ear plug in the muffler exit (after flying, of course!) to keep the oil from dripping everywhere.
04-23-2013, 01:11 PM
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RE: O.S. 46 AX oil in muffler after flying
I always take a piece of paper towel, about 4" X 4", roll it up and stick it into the muffler outlet to absork the oil.
04-24-2013, 03:56 PM
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RE: O.S. 46 AX oil in muffler after flying
ORIGINAL: gaRCfield
That is what I had used - again, remember to take it out. Should be easy to remember with the muffler on the topside of the plane. Mine was under, not obvious.
ORIGINAL: RC_Fanatic
Use a foam ear plug in the muffler exit (after flying, of course!) to keep the oil from dripping everywhere.
Use a foam ear plug in the muffler exit (after flying, of course!) to keep the oil from dripping everywhere.
If you start the engine with the plug in, compression will blow it out.