Hi, I've seen the questions on the forum and here are my findings. These may or may not suit, but they are aimed at large sails and big pilots in the 5.6mtr wheelbase of a Lake Lefroy Mini yacht.

I was going to redo these ages ago on "Google sketchup" to look nice and neat, but I could easily build 2 new yachts quicker.
My students at the Ag college and I are learning it, but it's not coming easily to someone who has spent his life building gear from a sketch off the back of an envelope.

Here is the layout of "Fowl Play" that I sail with a 6.2m2 and 6.9m2 sail, in almost all winds. Wind speed, needs to be above 25knots to downsize to 5.5m2. I weigh in at 113kg, and I'm 183cm tall.

These plans are the changes I have made to a standard "Lake Lefroy Mini" plan, to perform with larger sails.
A standard LLM built exactly to Paul Days plans, as on Seabreeze Forum,
www.seabreeze.com.au/forums/Land-Yacht-Sailing/Construction/Build-a-Landyacht-Lake-Lefroy-Mini-Yacht/
performs perfectly, with the smaller sails it was designed to use.
I just push the envelope of the design and have arrived at these measurements with "Fowl play" which is the 22nd LLMini I've built. So a fair bit of trial and error has evolved into these measurements.

All my chassis are from bent galvanized street signs I pick up from our local shire yard for free.

From the plans below, I have now gone to a mast step angle of only 2 degrees, adjustable back to 10 degrees and have not used the rear settings on the mast base. ie; mast in its fully forward position for all sailing.

Also the seat base/back intersection, has been moved 75mm ahead of the centre line of the 35mm x35mm x2mm RHS rear axle.

If I built another, I wouldn't bother with the complexity of the adjustable fore and aft mast position, I would just make it adjustable for rake angle (Like Pacific Magic in the construction section of Seabreeze).
www.seabreeze.com.au/Articles/Land%20Sailing/Original-Pacific-Magic-Plans-by-Paul-Day_1514690.aspx

I am using a 6.9 m2 cammed sail on a 5350mm extended carbon mast. IMCS 29 with 1000mm of 4.5mm walled internal stiffener up the bottom. The top 150mm of this stiffener, has fingers cut into it, to relieve the stress point, and bonded in with silicon.

Hope this is of some assistance for the bigger fellas out there.



Just ignore the shim note on the photo below, as it is for my fitting into my jig I have.





The ratchet block is just stored here so I don't lose it. I use a 6 to1, "Crocket downhaul" system.

12mm all thread does the adjusting.




My rear axles have only 1 degree of camber now. 0.7 before I am seated in it. This snap below is the view from the rear of the axle. My yachts have gone from 8 down to 5 degrees of camber. "Saline by" was down to 3 degrees and was holding better when I used a 5.5 m2 sail. "Landyacht" suggested I go a bit further and they are now 1 degree. This works a treat for my rig. Tyre wear is very even and the back end is nailed to where I want it. When it lets go now, the world spins round big time. Last time at Lake Lefroy on very hard salt, I ran the left side at 1 degree and the right at 3 degrees for a couple of hours, just to see if I could tell the difference. Yes that's why I was back and forth across the pond on the same track for so long. There was a marked difference in the tyre noise and the 1 degree wins hands down on grip and = better speed. I just kept standing the mast up till it cornered well and the back didn't slide at all. It was a great couple of days to test things out and I tried to get as many people sailing it, for their ideas as well. Most comments were that 6.9 m2 isn't at all different to the smaller rigs, even in high winds it's very manageable.


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Fowl play has now done just over 2,100 GPS logged kms and had 3 chassis cuts/mods done.

PS; As a side note, Greg was back on Pink Lake this arvo sailing and said the surface was dead smooth. Shame we have more rain forecast for tomorrow.

Cheers Chook
(lots of edits, as my spelling is NOT good. )