I have one of these. It is a crossflow (baffle) motor with a ringed aluminium piston. C/L version. Can anyone with experience of these engines tell me how they behave? Are they any use for stunt?
Thanks in advance.

Charlie

Hi Charlie

That is one of the best stunt engines OS ever made, many people used them instead of ST 46s.
These were single by pass motors, with a baffled piston.
A 23 %  1/2 castor  1/2  syn.  works  very well in the motor.
If you run the motor in a nice rich 4-2  it will last a long time and give you many 100s flights
They have good power, a friend of mine flew a 630 sq in plane with his, with no problem. It would have pulled a larger one.
This would be a good engine for most ST 46 size  airplanes

Regards
Randy

Hoping I've got this right - It's worth remembering there are quite a few 40 motors with MAX-H on the side. For starters there are two basic configs. with different bores and strokes. The narrow bore ones are all lapped and single ballrace (I believe) and the large bores are ringed and double BB. Narrow bores come in at least R/C and RR versions, RR being Rat Race! This does not make a good stunt engine, but the R/C is pretty good for stunt? Don't know if any were put out as stricly C/L. R/C and RR appear in a little circle on the c/case somewhere.
The large bores were available in R/C and I don't know what else, but they were double BB and in the search for more power for the R/C boys, they became a little less friendly for stunt.

Thanks Randy,  that description fits the engine that I have exactly with the exception of the marking under the engine lug.

Randy do you sell a venturi for this engine I have a .40 R/C engine that I have never run and would like to convert it for C/L . Thanks T.J.

Hi

Yes I can make those for you plus I have the NVAs that work that are PA style

Randy