Here's a build thread that I started last year. I powered her with a Quickdraw and hitting 60 wasn't a problem. Yeah she got light in the front after 55 mph but with some added weight in the bow I pushed her into the mid 60's. If you get one I'll tell you all the things I had to figure out to get her to haul.
Dave
http://www.rcuniverse.com/forum/m_8896921/tm.htm