
...........And this is what I came up with.
...........And this is what I came up with.
The front runner plank was lengthened to make the wheelbase to back axle 1.3 times the rear track for best handling and I used one of the rear wheels for the front end.
The wing is simply pretty much what you see, which is an ally tube mast with diamond shaped ribs made of ply, foam stuck on that and then the whole lot was hot wired with Dad's birdman rally hot wire, powered by a welder.
This dictated the spacings for the ribs as the hotwire was only a bit of nichrome wire now and then with copper wire for the rest.
after the foam was cut, there was a strip of balsa glued onto the edges of the foam to provide a surface for doublesided tape to attach the mylar covering.
At Lake Finnis , where this was taken, I made a run to the fence about 5 k's away in about 4 minutes and I reckon it must have got close to 120kmh or so.
When I first got it cranked up, it was slow to get going at first but once it passed the point of being stalled it took off and just kept winding up. I'd never heard stays scream before or realised the wheels were out of balance.
I realised I could just see the fence that crossed the lake ahead of me and went to back off the sheeting (one block and a bit of rope at the back of the wing).
At this point the wing gave one flick of oscillation and spun the yacht out!
Fortunately I managed to hang on until things stopped spinning and I looked out at the fence about 50 ft away!
That's when I decided that if I was going to try to do this I had to build a new yacht to do the job - one that I was more enclosed in and with a more substantial wing and better controls............