Razor-RCU

My Feedback: (50)

OS-50SX (ringed)
Tower muff.
9x8 APC
15% PM
OS-8
85 deg.

15.7K

Tiroloco

My Feedback: (1)

25% Oversized Tower Muff.
15% PM fuel
12.25X3.75 Propeller
9000 Feet over sea level altitude
O.S. plug
95° F

13,700 rpm

Hughes500E

My Feedback: (16)

OS50 SX
OS#8 plug
85deg
running 5% sport 20%castor
11x7 MA GF-3 prop
11,970 and she pulls

Razor-RCU

My Feedback: (50)

Well I have a different one this time and a bit better performance:

OS-50SX
9x8 APC
15% Powermaster
OS-8
70 deg.
1,500 ASL
16K Even

pettit

My Feedback: (23)

I have a pair of them on a TF Cessna 310.

12-6 APC's, 15% Omega fuel, 60 degrees, 300 ft ASL.

Each turns 11,450.

ACP Engineering

My Feedback: (1)

Dick,

I picked up my TF Cessna 310 last night and per your recommendation I asked for (2) OS 50's but the OS 50's are no longer available... it is reported that OS 55's "that the" distance between bottom of engine mounting to the top of the cylinder head causes a cowl interference. I would have thought that these were the same size castings. Did your OS 50's just barely fit?

Thanks

ACP

pettit

My Feedback: (23)

They clear the nacelles by about 1/8" to 1/4" maximum.

HellcatAce

My Feedback: (6)

OS 50 SX
Slimline sport scale in cowl muffler
20% Powermaster fuel
12x6 MAS K series - 11,800 rpm
12x8 MAS K series - 9650 rpm
The 12x8 didn't overwork the motor, but a little overpropped.
Also have an APC 12x7 I haven't tried yet.

buzzingb

My Feedback: (2)

Hellcat thanks for posting those figures as I have been wondering how the 50 would pull the larger props. I have a Super Tiger 51 that pull about the same rpms with a 12X6.

Luxuswaffe

OS 50 SX rpm's:

APC 9x8 @ 16,700; APC 10x6 @ 15,200
Sealevel (Florida)
90 degree Fahrenheit
60% humidity
15% PM, 18% oil contents

The 50 SX doesn't like bigger props. Besides, the rear ball bearings, piston rings and piston sleeve are worn up. Replacement parts exceed the cost of new engine. Had the SX 50 in a quick delta wing. Going for a Dubb Jett or MVVS now.

mr.scale

My Feedback: (4)

cool I've been on planning on buying 12x6mas k-series for my plane!,
Hey check this out: a guy at the field said that this engine will not work on a plane......
well I did made a few flights but i havent gone back flying
will or will not work for a plane?50 os max
Fernando

Luxuswaffe

Never tried a 12x6 on the OS 50 SX. As I said in my previous post, the 50 SX doesn't like to turn larger diameters with high rpms. It will certainly run but don't expect too much. There is a reason OS take this engine off the line. Try the 55 AX with the bigger prop. If you want to go speed don't waste your time with OS. Go Jett, Rossi or MVVS.

mr.scale

My Feedback: (4)

thanks

howiej

OS 50SX

Ultrathrust tuned muffler
APC 8.75x8.75w pylon prop
15% nitro
sea level
17200rpm