If you get one made where that diaphrame really gets moving that movement alone will make the boat faster and pro it more then the steam will alot of it power comes from vibrations of the steam
There are a few ideas for building boats: Give yourself plenty time. take advantage of done for you boat templates. (I learned about these and more from Denelle boat builder site )
Yes I`ve seen that video and others and now it seems that I had the wrong idea about how pop-pop boats work. I assumed it needed water in the boiler to boil to steam and this would produce the forward motion but that is not how it works, there is more to it than that. Thanks for your reply.