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Speedsail board

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Created by landyacht > 9 months ago, 18 Jun 2008
landyacht
WA, 5797 posts
18 Jul 2008 8:44PM
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still not scaring me

jp747
1548 posts
19 Jul 2008 3:40PM
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nebbian said...

Did anyone else notice the size of the guy's eyes behind the visor?

Seems like an exciting way to spend an afternoon


very observant...that guy should wear neck braces at speeds

Squid Lips
WA, 699 posts
20 Jul 2008 8:25PM
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I was visiting my folks last week so I thought I'd take a few pics of the land board my Dad made about 20 years ago. He copied a pair of trucks off one of my skateboards and made a bigger stronger version. It worked brilliantly, although I never went super fast on it from fear of the consequences. Thought the pics might be helpful for anyone wanting to build one.

(The wheels have been pilfered for other projects)







The trucks are now back home with me instead of rusting away in Dad's shed, this thread has inspired me. Horrific injury photos to follow (probably)

landyacht
WA, 5797 posts
20 Jul 2008 8:54PM
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Thanks squidlips for the great photos and the vote of confidence.
The new version 3 is still having wheel wobble problems but I have 'nt given up. Today i came off only twice and have learnt to roll nicely on the smooth salt
on a more positive note I did my first Gybe today. I was well chuffed,and sailed back to tthe starting point and around a yacht before falling

decrepit
WA, 9537 posts
20 Jul 2008 9:30PM
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landyacht said...

>>>
The new version 3 is still having wheel wobble problems but I have 'nt given up. >>>


You could figure out which trucks are in -ve castor, (I can't do that in my head anymore) and tighten them up, or just fix them solid.
If that makes the turning circle too large, you can increase the angle of the pivot spindle, the more vertical it is, the more the wheels turn for any given change of deck angle.

NotWal
QLD, 7084 posts
21 Jul 2008 2:47PM
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decrepit said...

landyacht said...

>>>
The new version 3 is still having wheel wobble problems but I have 'nt given up. >>>


You could figure out which trucks are in -ve castor, (I can't do that in my head anymore) and tighten them up, or just fix them solid.
If that makes the turning circle too large, you can increase the angle of the pivot spindle, the more vertical it is, the more the wheels turn for any given change of deck angle.


Is that trailing castor like the opposite of bicycle castor? If so it's the front ones no?

landyacht
WA, 5797 posts
21 Jul 2008 6:57PM
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present plan is to build a new reartruck which pivots up and down only this will allow the board to pivot for the front steering and not be able to wobble fore and aft(it makes sense in my head). The V3 board was great on length and grip. ,and the only falls I had were when I tried to slow from a particularly bad "wobbleboard session"and the sail back winded.
I was really impressed with myself when I managed a gybe( yes that impressed) so I'm looking forward to the next version

Demon Design
5 posts
22 Jul 2008 6:25AM
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Hi all
the neatest solution i have seen to this was from Ken Kingsbury in rotorua, NZ.
He slung the board under the front axle, then attached short wire lines from the outer ends of the front axle, inwards and back to points on either side of the board, thus when you bank the board left, you pull the front left axle back and steer left , bank right and you steer right. No speed wobbles. was very clever i thought.

elmo
WA, 7968 posts
22 Jul 2008 7:54AM
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I quite liked the "C11" skateboards Truck design which gave true tuneability for the style of riding you were attempting, first saw it on the New Inventors.

www.abc.net.au/tv/newinventors/txt/s1871861.htm
www.grombiz.com/
www.grombiz.com/bombing.pdf

By tuning the way the trucks are able to turn they can make the boards set up for super turny moves or for high speed bombing runs where speed wobbles are eliminated.

&fmt=18&feature=related

Hopefully there is something in here which is helpfull

landyacht
WA, 5797 posts
22 Jul 2008 6:15PM
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Brilliant thanks for that . I managed to test version 4 without even building it by reading their tech sheets. It failed.
I think we are on the track to a working ,less painful board

tasflyer
TAS, 48 posts
23 Jul 2008 9:47PM
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Thought I'd get around to posting a couple of pictures of the thing I built around 18 months ago following the the suggestions from this forum. Absolute minimum effort project:-

- Deck is a scrap of wood ~ 1.2 m long.
- Skate trucks are off an ancient skateboard since re-juvenated with new "rubbers" purchased for $10.00 from a skate shop.
- Wheels, axle, etc are from a pair of cheap trolleys (the type almost all hardware stores now sell for ~ $25.00).
- Axels were not cut down at all from the trolley and are connected to the skate axles using a pair of U bolts AND a pair of pipe clamps (jubilee clips).

I have used the thing quite a bit in a carpark, on the beach and on a football oval - pretty much always in light winds. Would have to say the fun per effort return has been great. It works way better than what I thought it would. To add a couple of points to stuff already posted:-

- Apart from obviously tightening the trucks, a technique thing you can do avoid the speed wobbles is to unweight the board by hanging off the boom. This transfers your weight to the mast base and hence the centre of the board. You may want to be a little careful if you have the mastbase mounted foward of the front axle.
- My board is just big enough for me to use a 5.3 with. Any larger and the centre of effort of the sail is too far back. IF you do a liitle geometry you will work out the turning radius is proportional to the board length. A 2m length board won't be much good for tooling around the carpark with so this is a compromise.
- The next deck I make will be slighly longer with the mastbase further back so there is room to get around the front of the board like a normal windsurfer tack.

I have got a litte video I'll see about posting.

Cheers
Marlon

tasflyer
TAS, 48 posts
24 Jul 2008 9:52PM
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Tooling around on it in a local car park on a cold winters day.

landyacht
WA, 5797 posts
24 Jul 2008 9:33PM
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I am well impressed Another idea for me to work with. could you do me a favour and and put that video of the dual bicycle landyacht into the construction section in the landyacht forum . The guys over there need a shot of inspiration to get them thinking out of the box again

landyacht
WA, 5797 posts
28 Jul 2008 9:51PM
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one of the designers on the landyacht forums got inspired and built this idea . seems its working so far but not been tried at speed.

Here on Lake Lefroy i'm contemplating a kite board. it just keeps on raining. anybody for ground effect windsurfing?



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"Speedsail board" started by landyacht