Hi Everyone!

I would like your input on my Land Sail Design. Its my first hack at it so be nice = ). Most things are fairly well dimensioned but some things are just assumptions. Let me know what might be improved.

The frame is designed to be broken down into parts. I will post an exploded view soon.

To all the engineers out there, yes I know I did not properly dimension my drawings.

Some of the assumptions I used that I would like checked by you all:

1) 1.5" Nominal, schedule 40 Steel piping for the frame (2in square for rear axle and under the mast); too light/heavy?
2) Full Land sail weight, no riders ~ 150 lbs; is this too heavy for a twin?
3) 13in - 16in wheels, frame will be ~6 to 8in off the ground - is that ok?
4) Mast step positioned ~41in from rear axle
5) Mast step approx 2in inner diameter, 36in tall @ 7 deg rake angle.
6) What size of sail do you recommend for a twin and what is the diameter of a standard mast both SDM and RDM?
7) How much distance should there be from the frame to the boom? ... or from the top of your head to the boom?

Thanks for your input Everyone! Would love to hear your ideas for improvement on the design! Once I start building, I will post pics. (..might take a while though, just starting to gather materials).