Author Topic: OS.46AXll (Read 1062 times)

Target · « **on:** July 14, 2017, 10:40:49 PM »

So, I have one of the OS.46AXll ABL engines, NIB.
I intend to try to use it for C/L. There is some info from Randy Cuberly that suggests it will work and fly planes that a ST60 would normally fly well with.
I think Randy said a .275" venturi with ST needle is about right, but I will double check the Legacy thread where the info is.

My question is about break in. I am thinking that breaking in might be best performed with the carb on it. Any thoughts about that?
This engine will land in an ARF SV-11, or the Stiletto I have yet to build, at least at this time, that is my intention.

R,
Chris

Dan McEntee · « **Reply #1 on:** July 14, 2017, 10:56:15 PM »

Quote from: Chris Behm on July 14, 2017, 10:40:49 PM

So, I have one of the OS.46AXll ABL engines, NIB.
I intend to try to use it for C/L. There is some info from Randy Cuberly that suggests it will work and fly planes that a ST60 would normally fly well with.
I think Randy said a .275" venturi with ST needle is about right, but I will double check the Legacy thread where the info is.

My question is about break in. I am thinking that breaking in might be best performed with the carb on it. Any thoughts about that?
This engine will land in an ARF SV-11, or the Stiletto I have yet to build, at least at this time, that is my intention.

R,
Chris

What do the instructions say about break in? I would follow what is written no matter what you have installed, carb or venturi. The engine doesn't care. I would wager that the instructions are for more of a heat cycling procedure, and may not require a whole lot of time on the bench. And you probably don't want to run it too rich either. That will be hard on rod ends. I wouldn't sweat it too much until you decide what to put it in.
Type at you later,
Dan McEntee

Target · « **Reply #2 on:** July 31, 2017, 11:58:51 PM »

Hi, Dan
The instructions actually say to run it in a rich 4 cycle first minute, then tweak the needle to just two cycle 10 seconds, then back to 4 cycle for 10 seconds, and so forth for the first tank (r/c sized tank).
After that, it says to fly the plane at a setting where the engine is at the 4/2 break for 3-4 flights.
All the experts so far have told me to not run the engine for break in with a four cycle. Seems like there's a discrepancy between common opinion and the instructions. Maybe going back and forth between 4 and 2 gets enough heat cycling, but the 4 cycle periods allow any break in fine debris to flush out?
Just not sure, but following the instructions seems like a plan.

Tim Wescott · « **Reply #3 on:** August 01, 2017, 10:15:06 AM »

Quote from: Target on July 31, 2017, 11:58:51 PM

Hi, Dan
The instructions actually say to run it in a rich 4 cycle first minute, then tweak the needle to just two cycle 10 seconds, then back to 4 cycle for 10 seconds, and so forth for the first tank (r/c sized tank).
After that, it says to fly the plane at a setting where the engine is at the 4/2 break for 3-4 flights.
All the experts so far have told me to not run the engine for break in with a four cycle. Seems like there's a discrepancy between common opinion and the instructions. Maybe going back and forth between 4 and 2 gets enough heat cycling, but the 4 cycle periods allow any break in fine debris to flush out?
Just not sure, but following the instructions seems like a plan.

Real experts who are being complete in their language say "in general do XXX". Then they say but if the manufacturer says otherwise, do that. There's not very many exceptions to that if the manufacturer is reputable (which OS is) and the engine is in current production. Maybe you'd want to do different because it's CL and not RC -- but the proper stunt run is enough like a proper RC run that I think you should just do what they say.

Unless Randy Smith says otherwise -- then do what he says.

Author Topic: OS.46AXll (Read 1062 times)

Target

OS.46AXll

Dan McEntee

Re: OS.46AXll

Target

Re: OS.46AXll

Tim Wescott

Re: OS.46AXll