Hi
With the right materials I think I can make this boom , downhaul strong enough to pull 150 > 200 kg . ( Question : If I make it strong enough to pull 150>200 kg it will always pull this its fixed , I can not variate this . This is good when I need to close the sail to the max. but what if I need to open up the sail ? )
Iam thinking to use carbon tube instead of the Alluminium I use now for the boom it self . The white material need to be changed in to mylar with carbon fiber I think 
.
Why the white under the boom , 1st thing is to haul the boom down . The 2th thing why its there is It close the gap to the surface to make the sail go as low as possible .
3th thing ..... design , Iam planning to close the gap between the white under the boom and the numberplates . this will create one big white number plate where I can put my own stickers , sail number and stuff .
Have Fun ( I no Iam having it 
)
Ruudje
Just finished a whole new mast suport for the VorteXX .
This time the mastholder tube is not fixed to the frame , It now is a part of the rig . I take away the rubber diabolo and made a non flexible conection for the boom . Now I can pull harder on the downhaul to prevent the sail from opening up in the top .Tomorrow the wether looks good for new test runs .
Have Fun
Ruudje
Up Date .....
Last weekend the wind was really a bit to ... 30 knt + and a lot of rain .
I went out on sunday , the sail Iam using 5.5 qm ( its my only one ) .
After a couple of runs on the shoreline fighting the elements , I ran in a spot of very soft and wet sand . This made the VorteXX stop whit in a few meters .
Because I was doing A downwind run , the mast holder didnt hold the mast that good 
. On this moment there was so much power the bottom part give way .
Back to the drawing board 
Have Fun
Ruudje
Ruudje,
Stick to the KISS Principal (Keep It Simple Stupid) The simpler the better and over engineer a little. To complicated and too messy will only cause you grief..
Ron
Your absolutly right aboute KISS , but first you need to find the best way to solve a problem and when you do try to make it simple .
Have Fun
Ruudje
