I have some questions on sail shape and tuning this particular sail. was hoping someone would watch video and provide some feedback. wind was around 10mph. what is most critical adjustment? (downhaul, etc....) seems to work best when i rig it with a little bag in downhaul and foot. i know its for a sailboat but it seems to work ok. if i were to modify or make a new sail, what design features should be included? thanks.

kiwi, appreciate the response, wish you could open it. really don't want to modify existing sail, would like to make a new sail with the right characteristics, not enough experience to know what i need to do. would like to have a sail that would also work on the boat, even if it was fully battened. do have access to a sailmaking outfit within ten minute drive, don't know if they have landyacht knowledge. will try to talk with them this week.
different question. how does rear axle width effect performance? in lighter winds should i make it more narrow?

different question. do you move center of effort up or down depending on wind conditions?

i think i followed the posting directions for seabreeze.

I was able to watch that one Eric.

From what I could see in the vid that sail appears to have and hold quite a good shape while you are sailing.

It only flutters or luffs as you go through the tack, which would be reduced if it was full battened.

Doesn't seem like you had a lot of wind on that occasion and the comparitively full belly of that sail worked to your advantage giving you the low down grunt you needed to get the yacht sailing.

In stronger airs I think that sail would stall (luff) when you get up to speed and limit the yacht from going faster.

You intend experimenting with other sails so it is probably a good idea to leave that sail alone and use it as a benchmark to compare other sails with. Doing this will, I am sure, teach you a lot about sails, not that I am any expert.

Speed sails for land yachts have a high aspect ratio ie the ratio between the height and the foot of the sail, and a fair amount of roach at the top, ie like a triangular sail with the top corner cut off.

I don't know if you have experienced high speed in a land yacht yet (anything over 30 mph or 50 kmh) but when you do I think you will need a little more space than the church car park especially if it is icy.

Apart from all that it looks like you were having fun even though rugged up like an eskimo. Our protective clothing usaully consists of sand shoes, gloves and helmet. Any other clothing is optional subject to local standards of decency and the ability of the sailors skin to withstand sun burn. Hope you can make it over here one day to experience that.

Have fun mate and keep us posted. Cheers Cisco

easy one!! the mast and sail you are using were designed to have a downhaul AND a boomvang.
raise the sail on the mast and re-install both of them and you will be able to flaaten your sail.
this will make the rig work more efficiently , and you will discover that your side stay arrangement will start hitting the ground. you should consider attaching the stays just inside your rear wheels. ( you may need to extend the stays slightly)
your rear axle is flexing very nicely
on the safety side you may want to consider raising the steering pedals and putting some kind of guard under your feet. it is an accident that WILL happen.
I once held a foot on the end of a leg whislt the owner was being taken to the ambulance station.It was not fun for anyone . same setup
meanwhile , vang and downhaul

no , ive seen 2 bad ones, . I recommend to people that they make a weak point in thier steering against a head on stop. last year one pilot walked into camp with 2 very sore ankles, but thats all