www.iceboat.org/optis/buildopti.html

http://www.icesailing.org/junior/docs/IceOpti-TrainingManual.pdf

kiwiboy said..
Hi MKD

Keep an eye out on trade me for wind surfer sails and masts. I bought a whole wind surfer for $20. 2 near new sails for $20 and found some guy who gave me 2, 2 piece masts. Where are you?

Steve

Hi steve,

ive been looking for a while on trademe. I'm in hawkes bay but i should probably learn to weld before i buy anything!
The dump here has lots of snow skis and scrap steel so should be able to get something to work with.

leaning towards a skimini type build at the moment to utilise the skis at the dump...

Ok new thought.
What about a windsurfer boom attachment at the mast base (the clamp-type ones), meaning the boom becomes a blokart styled mast-stay fixed back to the rear axle? This would also mean the standard windsurfer mast foot/base could be used onto say a plywood platform (with treaded insert to suit mast foot) which would form the seat/body of the yacht...the length of the boom-stays could have thumb stud holes for increasing or decreasing mast rake.

possible? Probably. Anyone tried?

The ice opti's seem to get up a good clip with the std rig, less drag on the ice i guess. Theres a few good videos on youtube.
Do you think a plywood base/seat would be strong enough to take mast forces from a standard windsurfer mast?
Could be thicker like 15mm etc? Or a double 9mm at that area etc.

Im trying to find ways to build without welding as i dont know how and dont have a welder haha

MKD said..Im trying to find ways to build without welding as i dont know how and dont have a welder

This one is practically "welding free", based on a USA commercially available set of plans.
IIRC, the plans are around $20.00, almost entirely plywood.
No idea how it performs - but this is the only weld-less design I know of.

www.seabreeze.com.au/forums/Land-Yacht-Sailing/Construction/UK-Wooden-Mini-Build/

stephen

In 'How to build a LLMini' there is some info on various sorts of wheels..
www.seabreeze.com.au/forums/Land-Yacht-Sailing/Construction/Build-a-Landyacht-Lake-Lefroy-Mini-Yacht/

Fallshaw wheels are well proven on landyachts and are available in Nz You can also get plastic inserts to take
industrial 20 mm deep groove bearings for them Front wheels don't have the same load put on them so you can get away with something less

Test pilot 1 said..
Better off getting all 3 the same, as they then are interchangeable e.g. good front wheel 1 side tyre wears thin, just swap wheels and keep sailing. Also same bearings all round.
It also helps to use tubular spacers between the bearings to enable bolt axles to be tightened properly

Cheers just sent off for a price on the fallshaws and deep groove bearings

Hiko said..
Fallshaw wheels are well proven on landyachts and are available in Nz You can also get plastic inserts to take
industrial 20 mm deep groove bearings for them Front wheels don't have the same load put on them so you can get away with something less

Is 20 mm the internal diameter of the bearings?

As said above 20mm is the preferred size for stub axles 3/4 is OK also but if you are starting from scratch
Metric size bearings are more readily available and generally cheaper
Bearings that have non contact seals have less friction rubber seal types keep grit out better but are more draggy
Horses for courses. I have found the non contact types last reasonably well