A Friend of mine put a DLE30 in his Cub and it was way over powered..It tore the firewall out after 3 flights It was a ARF Cub and he was really ripping it around...I think the DLE 20 would be fine..I have one in a Seagull spacewalker 120 and it has lots of power...I have aOS max FS 125 in my Sig 1/4 Cub and it has pretty good perfermance...I am building a BUSA 1/4 Cub and I am going to try a OS Gemini 160 Twin...I think It will probably have about the same power as my Os fs125 I am hoping for a tiny bit more for float use...I think the 125 would be enough anyway but I havent tried it on floats yet...Has anybody else tried their Cub with the OS 125 FS on floats?</p>