I have built 3 of the Shrike 15's. The first has an OS .15 LA, the second had the OS .25 FX and then the GMS .32 then back to the .25. And the third had an old OS 15 FP in it. I crashed the first two and am going to build a twin engined Shrike using two OS .25 FX's. It'll be a twin boom model. Here are some pictures.