No, there's a spend motor in place. The MMT came out rather flimsy. For launch, it needs to transfer force from the engine block to the centering rings, which means it will be in tension, and it will be fine that way. But against a side load it will squish very easily, so I keep an engine it is for support. I followed what I understand to be the normal instructions for rolling a tube, and I expected a stronger result. It will do.