Identifying OS Engines
Larry E. Snyder
I just purchased three airplanes to replace the ones I lost in my house
fire. All three have OS Max engines (believe it or not, I've never owned OS
before, always Saito & K&B) and I don't know how to identify which model or
size the engines are.
One of the planes is an almost-completed Senior Falcon, and the previous
owner sheeted the wing and stab! Still feels pretty light, though. Anyway,
the engine on it is brand new, but the needle is missing and I need to
replace it. The engine says "OS Max" on the port side and has "45" with an
"F" below it on the starboard side. Any ideas?
I've flown one of the planes before. It is one fun plane! It has an OS
engine with a Perry carb. I haven't dug into it yet, but I suspect there's a
pump there, too.
Anway, any help in identifying engines would be greatly appreciated!
Larry
***********************************************************************
* Larry E. Snyder * *
* Monsanto Company * CLEVER QUOTE OR PHRASE GOES HERE *
* St. Louis, MO * les...@monsanto.com *
***********************************************************************
Steven W. Bixby
: One of the planes is an almost-completed Senior Falcon, and the previous
: owner sheeted the wing and stab! Still feels pretty light, though. Anyway,
: the engine on it is brand new, but the needle is missing and I need to
: replace it. The engine says "OS Max" on the port side and has "45" with an
: "F" below it on the starboard side. Any ideas?
If both the backplate and the cranskshaft housing (including the crankshaft)
can be removed from the crankcase/cylinder, then you probably have an "OS
Max .45 FSR", which is an excellent engine. I have a .40 sized version
that needs some repair from crash damage, and it's a NICE engine.
: I've flown one of the planes before. It is one fun plane! It has an OS
: engine with a Perry carb. I haven't dug into it yet, but I suspect there's a
: pump there, too.
: Anway, any help in identifying engines would be greatly appreciated!
Describe the others and we'll give it a shot. :)
--
-swb- (Steve Bixby, sbi...@crl.com)
sl...@cc.usu.edu
>
> I just purchased three airplanes to replace the ones I lost in my house
> fire. All three have OS Max engines (believe it or not, I've never owned OS
> before, always Saito & K&B) and I don't know how to identify which model or
> size the engines are.
> the engine on it is brand new, but the needle is missing and I need to
> replace it. The engine says "OS Max" on the port side and has "45" with an
> "F" below it on the starboard side. Any ideas?
Larry, I'll *TRY* not to confuse the issue with the limited knowledge that I
possess, but OS uses a relatively smart ID system. Having owned only OS
engines, the way I understand them is the displacement is on the crankcase (as
you have noticed). Each similiar displacement will be denoted by 2 or 3 letters
in the following manner:
.32 FS-H
_____________________|| |___________________
| | |
Fan (Air) Cooled Side Exhaust Helicopter
I am not sure that this arrangement holds true in all cases of OS denomination
but I have found a similiarity in each case. While you may or may not be able
go from the engine to the name, you can always go from the name to the engine.
Again I hope that I have not confused the issue.
Mark Bremer
Iskandar Taib
>In article <lesnyd.11...@tin.monsanto.com>, les...@monsanto.com (Larry E. Snyder) writes:
>in the following manner:
>
> .32 FS-H
> _____________________|| |___________________
> | | |
> Fan (Air) Cooled Side Exhaust Helicopter
I'm almost sure that the "F" stands for "front intake". For instance,
the .40 rear intake Schnuerle that OS made in the mid-70s was called
the .40 SR (this was supposedly one hot motor). A little later they
made a front intake version, and called it the .40 FSR. Later still,
they redesigned it and called it the .40 FS (I think). Much later, a
plain bearing version of the .40 FSR became the .40 FP.
Then you have the earlier baffle piston motors like the Max III .15..
I'm almost sure the "S" originally meant "Schnuerle ported". The .40
SR was a rear exhaust I think. Water-cooled motors simply had "Marine"
attached to the back of the label. It used to be that throttled
engines had "R/C" tacked on (FF and C/L used to be more common).
--
-------------------------------------------------------------------------------
Iskandar Taib | The only thing worse than Peach ala
Internet: NT...@SILVER.UCS.INDIANA.EDU | Frog is Frog ala Peach
Bitnet: NTAIB@IUBACS !