Hello there
I had been trying to get (with no success) a Hobby Barn Arrow and was planning on fitting the NR speed 13 to it.
The only advantage of the YS over a NR, discounting any power difference either way, would be that the YS would run better in an inverted configuration, with the fuel tank back over the C of G.
I have an old (still in box ) Hanno P Calypso and will be buying a YS Classic for it ( on the basis its a inverted installation).

I'm sure there must be someone with both the YS and NR , who could do a comparison


regards
Rodders