I have just ordered a Tower Kaos as my smaller winter pattern plane.
It will have skis on it when it's alot of snow.

But what engine should I use?
I have these to choose from

OS 45AX just broken in
SK 40 just broken in
MDS 46 just broken in
Macoy 40 no good
Enya 45 real old
OS 40 real old
HP 40 with pipe just broken in
YS 45 with pipe just broken in
Webra 40 from last winter, with 40 flights and one of my most reliable engines ever.

I'm thinking the HP or YS would be cool to use, I like flying with pipes.

Thanks.