Originally Posted by
jaka54
Hi!
As I said ...I think the OS is slightly more powerful as it is a more modern design. I have run several of these "new" AX engines and they are as good as any other OS has been or better. ABC or ABN dose not matter when it comes to how long an engine will hold up or how much power it will deliver.
suitable props for both engines are 10x6 ,11x5 or even 11x6 ( if using the OS). Best prop brands are Graupner G Sonic or RAM. APC props are good too but not as good as those first mentioned.
I will 100% agree, that the AX series is with some distance the BEST "ABN" engine OS ever produced, and yes, it is more modern, therefore probably porting is slightly more refined.
But the power increases in regular Schnuerle ported sport engines in general, have been at best in the low single digit percentages.
But having said that, Chrome by its very properties simply is a different metal (duh) which is FAR more suitable for glow engines.
It is that simple...
And OS has a reputation, one that is IMHO carried over from the past, but not entirely justified anymore. Still good, no doubt, but by far not the "Rolls Royces of model engineering" that they once were...