for a more modern system do a search for "Crockett downhaul"
an excellent system

Lachlan has shown a 3 to1 on the main sheet and 4 to1 on the downhaul(the floating pulley acts as a multiplier on the downhaul and only changers the direction of pull on the main), I use a bit more muscle and have 2 to1 on the main and 4 to1 on the downhaul. Although they aren't linked on the cat I have 8 to1 on the main and 12/16 to 1 on the downhaul

A diagram of the Crockett Downhaul (pretty sure I got it right ).

lachlan3556 said...
I find scrounging pulleys/blocks from cheap bins/shop specials dictated a lot of my rigging

pretty much the same as mine- for the same reasons!

most of my pulley blocks fell off an excercise machine

they are not perfect by any stretch of the imagination- but they work most of the time!
I usually find that the time that I need more pulleys usually coincides with my being broke.....one day I plan on Mr Riley getting a nice big order from me!
might be a while though!

landyacht said...

for a more modern system do a search for "Crockett downhaul"
an excellent system

ive been searching but it still comes up with no results on the seabreeze search

www.seabreeze.com.au/forums/Land-Yacht-Sailing/Construction/The-Crockett-Downhaul/

Well I don't know how you did your search but I just found three Threads with the Crockett DH System in them.
Have a look at the one above as it has an excellent photo of what you are looking for.
Ron

Previously, "from watching sailboard setup videos it appears that it took considerable more effort with higher ratio block systems to get the mast curve. do you not load the mast, inducing curve and flatting sail as much?
I would expect the to straighten and recurve on each tack or sheet adjust of a few inches."

The Crockett downhaul provides a number novel solution; 1) It allows a sustained pre-tension on the downhaul with a lesser additional tension from the mainsheet.
Two double sheeve blocks, one with becket; rove to advantage with bitter end secured to a cleat. (If rigged true vertical it will decrease the boom tension on the mast reducing side load on mast. A line to hang the mainsheet turning block off the mast would reduce clutter in cockpit.)
www.seabreeze.com.au/forums/Land-Yacht-Sailing/Construction/The-Crockett-Downhaul/

Considerably different than some of the others pictured on various landyachts.

Mike there is no need to per-Load the Mast it is cut into the Luff and as the Main Sheet is hauled in the mast then takes on the shape in the Sail Luff pocket. One advantage in this method is that the tension on the mast is not constant and allows the Mast to relax when not sailing.
Ron

landyacht said...

That outhaul with 1:1 and 4:1 looks like just the thing, but can you reach it when sailing?. perhaps consider a dual highfield lever systemI will post a photo)

Cheers. I was going to put some sort of toggle or bead in between the rope and shock cord to grab on the way past! But if you've got any photos to stop this being a suck it and see job that'd be great - might save me a boom.

Cheers Col

Here is the set up on my class5 boom
It has an internal car with two curved rollers that ride on the inside of the boom
Between the rollers is an attachment for the clew of the sail that slides forward and back in a slot in the top of the boom
Behind the car and attached to it are three sheaves and fixed to the rear of the boom
and inside it are another three sheaves with the outhaul line exiting on the underside
of the boom and passing through a jam cleat and finishing in a plastic ball
The bungee loop showing stops the outhaul ball flailing around when close hauled
The mainsheet system is not that far back when sailing !



The car is pulled forward by strong bungees 3x5mm dia and fixed at the front inside the boom These could actually be stronger
Some people have used skateboard wheels for rollers but these ones are solid
white plastic

View of underside of boom

Hiko

Do you need shock cord to take the tension off the sail along the foot? I was hoping to outhaul with the blocks and let the wind take the tension out again. I'm using a Laser dingy 'racing' clew strap which slides really easily but is that enough? Problem I have is all this work can't be tried out till Elvington opens again at the end of February

Cheers Col

colk2004 said...

Hiko

Do you need shock cord to take the tension off the sail along the foot? I was hoping to outhaul with the blocks and let the wind take the tension out again. I'm using a Laser dingy 'racing' clew strap which slides really easily but is that enough? Problem I have is all this work can't be tried out till Elvington opens again at the end of February

Cheers Col

The strong bungees inside the boom are necessary to overcome the friction in the system mostly in the multiple sheaves so that the sail can be eased when off the wind [as much as you are off the wind in a landyacht anyway]
It seems crazy putting all those sheaves in to get mechanical advantage and then counteracting that with strong bungee cords pulling in the opposite direction but the system works well and needs to as it is twiddled with above the head
All it takes is a finger to pull the cord in front of the jam cleat to release and a finger and thumb on the ball to tension when on the wind
I have had other systems [crankhandles ,camlevers ]but this seems to be the best so far.
The two roller wheels on the car inside the boom are nearly the full inside diameter of the boom. I did try a teflon slipper type car inside the boom but I think the rollers are better
Having said all that I have seen a yacht sailing very well with a lower batten right down near the foot and no outhaul at all!

Colk I would run with Clemcos setup if you can it looks easier to make and the
extra sheaves I have are probably not necessary and would require less bungee strength
I would add an extra hole at the top of the car for a split ring to stop the car dropping out of the slot when the sail is not fixed to it
Mine has this but doesnt need it as the rollers are near full diameter of the boom

My outhaul is pretty basic stuff, and little talent is needed to add it. I have 4 sails thai can all use this boom, and I don't have anywhere near the required talent to make an internal shuttle work This works just fine, tho.....

I Agree nothing wrong with that system I have simpler systems than that on my minis
The roller car system though is hard to beat for easy adjustment while sailing on different points on class5
Different Horses for different courses as they say