Built and flown two of them--love Merc Engineering. This kit was my daughter's first MPR and flies really well on anything E thru G. Install the nose weight and it will be fine. On the second one I added an Estes 29mm motor retainer and it works well, but tape works too. Favorite motor is probably the G71 (when we had them) or the G64W. Flew it on the Metalstorm/Darkmetal Gs a few times as well. Saw one fly once on an H, and it looked right on the margin of what this rocket can do--it did not shred, but it looked close to me.