OS 46 VX-M Dry Run - RC Groups
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May 19, 2012, 01:50 AM
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OS 46 VX-M Dry Run

Hi guys,

newbie, nonetheless have come into possession of an OS 46 VX-M.

am in the process of setting up a dry dock (with water supply) to get the engine going. I am trying to think of the best solution to provide load to the engine as i don't want to run it without. just a regular airplane prop? will the recommended prop for an aircraft engine of the same size be suitable loading for a marine? should i look into a weighted flywheel? Can i tune the engine properly in this circumstance?

surely plenty of people have been through this before.

thanks in advance,
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May 21, 2012, 01:27 AM
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coriolan's Avatar
Welcome to RCG, it would be difficult to mount an airplane prop on that engine since the exhaust is facing toward the back and the OS 46 VX-M do requires a tuned pipe to run. ABC or ABN engines do not requires breaking in like a ringed or lapped engine,running them too cold or too rich will destroy the piston/sleeve fit in no time and its almost impossible to get spares for OS engines. The best way to run a marine engine is in a boat!
You will get more expertise in the IC racing forum:
May 21, 2012, 12:14 PM
"day ain't over yet-"
der kapitan's Avatar
Looking at the thread title, I was wondering how one could put a boat through a "dry run"---.
May 21, 2012, 01:07 PM
AndyKunz's Avatar
We used to run airplane props on them to break them in.

May 21, 2012, 01:56 PM
Registered User
coriolan's Avatar
It is not easy to mount an airplane prop on an OS 46 VX-M as it is set up to use a flywheel+collet without a prop driver unless ones have the missing parts!
Last edited by coriolan; May 21, 2012 at 02:02 PM.
May 25, 2012, 07:06 AM
Registered User
Ok, thanks. I guess it all helps. I have watched several vids of marine engines running dry and without load and was just thinking there must be better way.

To the drawing board...

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