While searching for my downed plane yesterday, I found the remains of another bird. Not much there, I was in knee deep swamp water with heavy vine growth. I pulled out servos, battery and an RX, all had been in the water a long time but I wondered about the engine? It must still be there. I was already soaked so I reached in up to my shoulder and dug through the muck. I felt the end of the muffler. surprised how buried it was..

Anyway, I brought it home cleaned it off and its sitting in a jar of fuel.
It doesnt look to bad. I havent dissasembled it yet, any chance something like this will still work?

Its an OS 40 FP

steve

Some will say an FP 40 was no good when new !

I imagine its probably really weak now..I always liked those motors myself..it was about the only one I could set the needle on, hahahah

The 40 FP was one of the best inexpensive engines that OS built. I'd take it apart and clean it up and I bet it will run just fine. Maybe the person who lost it is still around and might like it back?

It should still be OK as long as the piston and sleeve it is not rusted tight. The OS .40 FP is not a powerhouse, it does give you good fuel economy, it is worth a shot.

The OS FP engines were and are the most dependable engines that OS ever made. They were not power houses, but they run and run and never give up. I still fly them today and look for them to go on sale in the Market Place. If the engine turns over, drop some oil in it, replace the glow plug and fire it up. Good Luck, Dave

I always liked that engine. Clean it really well, use a ton of marvel mystery oil putting it together. It will probably run great if its not all rusted up inside.

There were two kinds of FP's

The old one had a cast iron piston and steel sleeve

The newer one had an aluminum piston with a nickel plated brass sleeve

Sounds like a replay of an old OS ad...remember the smiling guy holding his 25 FP after pulling it out of a swamp?

you know, that does sound vaguely familiar...

Around here the FP was said to stand for Effin Piece...

I liked them though.

I have an old FP 40 I purchased new 20 years ago. I learned to fly with it on a Goldberg Eagle II, ran it a few months ago, still runs great. Anyway if its a nickle cylinder it may survive. A hard chrome cylinder will likely be corroded. The most likely problem is the crank corrosion at the rod and bushing.

I'll take it apart for the experience if nothing else...

Steve

I would take the glow plug out and the back plate off. Run water through it, put the back plate on ( the same way it came off ) . Then oil it up very well, lite oil. Then try and run it, with a 10x6 prop on it.

Yes , that is a good engine.

sticks