after all the building last year Ive gone back to unfinished projects and chopped up the last 3 speedsailers( windsurfer style set ups) and built a version 4 model.
last wekend Brian and I had a sail of V3 but the rear wheel kept going down , we only managed 25kph this weekend coming we will trial V4, which is lower with stiffer rear steering, and a bigger sail. I'll post some piccies when Ive got some scrapes and bruises to go with it
Cool, a buddy at work wants to build one of these, piccies would be good.
Do you use skateboard trucks for "axles"? Or another setup?
I built a couple of these last summer. I used skateboard trucks and attached the new wheel/axle assembly with simple U bolts. The wheels were golf trolley bought new fpr about $25 each. The new axles were made up with a M12 threaded rod with a piece of 12mm plastic plumbing pipe over that. Then a length of aluminum tube over the plastic. The Stainless steel U bolts bite into the ali tube and dont slip. All the nuts and bolts were stainless steel. Total cost without windsurf rig about $200.
the board Ive been playing with is up to V4, and this weekend I got it fired up.
the early boards hadsome monster wheelwobble issues. on this new board Ive lowered the hieght of the board, shortened the wheel base , made the axle width narrower. the board now goes where you want it and cruises up to 36.9kph without a wobble. I seem to using my feet to get it to go upwind and the sail to make it go downwind. .
mods on the next board will be trying to get better turning ability from the front end, a central raised bar to hold my boots to the deck, and a flatter sail that doesnt luff at only 36.9kph . the length of the board ended being shortened as I found you needed to have 1 foot right back on the rear wheels to get the rear steering to work.
with the narrower rear axle width I dont get tangled in the rear wheels when "dismounting".
managed to sail all weeknd with runs up to 3kms without a single fall or scratch.
photos later tonight
here is the board . this one is cobbled together from the previous machines , the ride height is just above the axles but I want to get it lower. the angle of the steering pivot is 45degrees but I want to leave the back alone and work on making the front more steerable. which means flattening the angle.I felt that the mast step needs to be further forward as I seemed to be fighting the steering when trying to turn downwind.
plan is to make the board narrower, say down to 190mm as my boot wanted to
skate over the deck and add a centre rail that a boot heel can lock onto.every time you go over bumps your feet want to jump off the board.It also needs a back stop for the rear foot for the same reason
finally Id like to get the weight down another 1-2kg, by lightening the steel sizes
afew more ideas, an some history here
and in a parrallel universe
Here is the second board I made. I found they needed to be really wide just behind the front wheels to get more leverage on the steering. The little circles dimensioned on the plan were instructions to the joiner for placing the gluing "biscuits" for laminating up the board.
now he tells me !!.
I finished the new board today. its alot simpler and more compact in the truck design. there is an improvement in the turning , but I suspect that is due to the better rubbers Ive made. the old machines had a stack of layers of rubber, this new one has a solid block of polyeurathane front and back. *hint- when cutting large blocks of rubber with a knife drip on some washing up detergent. and it will cut very easily*
Body is shorter with a 1330mm x 450mm wheelbase.the board is 190mm wide at the front and 140mm at the back..
clemco was right about the width at the front. I intend to make a set of "wing" steps at the front to help with tight turns. the problem is making something that wont clog with wet salt
this time , rather than a spring board Ive made one that is fatter in the middle ( think of the shape of an unsprung longbow)
my thinking is that the springy board is killing the steering rather than helping we shall see
who'd have thought WINGS
ben lexcen and clemco .
I added some steel framing and hardwood foot plates today and headed onto the road. previously all I could do was a sad zig zag down the street, but now it will easily do a u turn in 11m( street is 12m).
more than enough turning ability.
board weight was 10kg, down from 15kg for the last board, now its back up to 12kg with the wings.
heres a look at the simplicity and lack of materials in the new wheel mount/ steering mechanisms
You're an inspiration to us all, Landyacht
I wanna make one now... gotta be something we can do with these pesky easterlies!
Vairy tempting... you are a bad, bad man. [}:)]
Gotta get you some real sails now
I reckon something this size and profile would be about right.
BUT whilst sorting these 2 boards out I was short 1 base fitting .since we couldnt identify the brand , a mate machined 2 new alloy fittings to replace the worn plastic. now he's told me to leave him alone as he needs to machine all the fittings for a trolley which will carry his NEW lathe.
when that is done we can move his old lathe, for which we have already sealed the deal, to MY shed.
basically , Im broke AND banned from spending. for the rest of the year so expect to see photos containing some really ancient sails traveling at stupid speeds never achieved in thier previous lives .
maybe I could convert a landyacht sail to a sailboard sail
or make a bulkybag sail from scratch
I checked my list this ones actually version 7
Convert a landyacht sail to a sailboard sail!!! Now theres a twist!
todays testing was on a smooth claypan in light thermals( the wind , not the clothing). the new board was much better to ride, but could have been 150mm longer , as I put my rear foot onto the wheel once or twice.
managed 3 successful gybes, and deveoped a tacking system where I ran up into the wind, and put weight behind the rear axles spun the board and rig, and jumped back on.
sailing on thrmals was tricky as you could (did) get sudden wind shifts that put you on your butt in a flashouch
version 8 is now ticking, with a full steel chassis, and adjustable length
This all looks like too much fun. Looks easier to cart to the beach than that land yacht, but my biggest problem is that the weather hasn't been kind, the beach is north facing, and we rarely get northerlies this time of year.
Something like this looks like the go.
Do you have any more photos of your latest "prototype" ?
Got a bargain yesterday - a 6.1 Gaastra sail, and fibreglass mast to suit. $20!
+ 4 12" kids bike wheels for $8 (good ol recycle centre). What to build......
My wife is going to kill me
if you are going to mount those wheels from one side you will need to look at getting some good strong grade 8 bolts . if they are bike wheels they will only be 8mm(5/16) and that might be too weak. the wheels Ive used have all been either Falshaw golfbuggy wheels on a 12mm shaft or pram wheels on 1/2" shaft.
The board Im envisioning at the moment will be as wide as the inside of the wings on the last board with the "wings" extending further back, with no gap. Clemco is a lot more on the money at this stage. the rear to be wider.. I did use that rear overhang to lift the front wheels when tacking.
Im thinking of a full length steel chassis in 35x35mm box with the rear attached by a telescoping 30x30 section. the idea being to have a shorter wheelbase for tight turning and a longer wheelbase for speed. I did find that I collected the rear wheels a few times on the last test, but need to try again in a better wind
agreed, my thinking at the moment is for a simple steel frame underneath and the deck could be in 12mm ply with some strategic re-enforcing along thedges.
the stiffer board is a lot more responive that the flexy one.
I do like the thought of a board that can be tuned for tighter steering.by shortening it and putting a smaller rubber block in the front. the new board can get around a carpark, with care
I think I know whats going to be built this coming weekend... Hey Landyacht !!!!
there were a couple of thes at lefroy in 2007/08.
interesting set up.
they really didnt have a good wind range , and mainly reached.
BUT on the last session we saw them it was really blowing and the last yacht standing was TP1 in his 5 and they were keeping up with him upwind.
the technique(on land) seems to be to use very little of the available power to doodle along , then with a twitch , you jump up in the air, and perhaps land again .
i didnt see them traveling any great distance, and they wore lots of padding.
the wing itself was quite complicated, with lots of prebent carbon parts, so you would be doing well to replicate it out of crap.
seemed slow to set up , even compared to a windsurfer rig. I felt that it didnt use its potential. felt like it needed to have one end fixed to th deck...............
I still find a mini, or 5 is quicker to rig and uses far more of the sails potential