Decided to go with twin struts after reading this build thread http://forums.offshoreelectrics.com/...style-build%29 . I have most of my hardware for the build, i will be running counter rotating drives running on 6s. At this stage I am trying to work out how much room to leave between the prop shafts. I have to work out what will be the biggest diameter prop that I might use and then I can use this to set the distance for the struts. I am looking for around 50 to 60 mph.