Hello everybody .
Chinslip , This is a reply from Australia . Some years ago when I had a Mathe engine - before the 5 FINGERS DISCOUNT EPISODE AT MY HOUSE in which several Glow motors and my Mathe motor were stolen , I was in regular contact with LUIGI GIROTTO at ELI - KA Technologies in the USA who put me onto a link of people who were using Mathe engines in Large Scale Hydro's . I believe they were close to 6 feet long . Give Luigi a call and see how you get on .
Regards
Ian Baas
Tall Fella Racing
Australia