J43ds boom slot dimensions please

[rob57]

Hi everyone: I am making a new boom outhaul car for my boat (in-mast furling) and need the width and depth measurements for the slot and U-cavity on the top side of the boom. Photo attached, though prob not the right size so pls ignore the product code: it's just to show the slot.

I have attached a photo of the Spar Craft part but it costs an eye-watering £400+ ! I have some s/s plate and am confident I can obtain similar wheels and make this myself, but the wheels dia need to be right otherwise they will have too much/too little room in the slot. Incidentally Spar Craft told me they no longer have the torlon slides for the original boom car, hence looking for a new and better solution.

These wheels look to be about 20mm dia (?) or maybe less. They obviously run inside the boom (as opposed to the other retro-fit system which is to fit a traveler set-up on the top of the boom).

Your help is much appreciated.

Rob
'Mariposa'

[saltymetals]

Rob, i will arrive at my boat (43ds 2004) this coming Sunday and can then send you measurements. My boom traveller (original_) is the classic Selden type with ball bearings, not the fancy wheeled affair that you show in yr message. Anyway, reverting with dimensions.
Andrew
"Genial Bee"

[rob57]

Andrew, that would be really kind. Mine is currently the slide version outside the boom as well, but I am keen to make the version with the wheels and see how it works. I fly out in a couple of weeks so plan to make it before then and fit it - just need to get the size of the boom slot/aperture.

Thanks
Robin
"Mariposa"

[andreshs1]

Hi Robin

Did you get the measurements? I will be on the boat next weekend

I need to replace mine and adding wheels would be a massive improvement to the experience of dealing with the sail, that design looks great

Cheers

[rob57]

Hi Andrew,

Yes, they are 19mm diameter wheels. My initial trial version fits well, slides in the book slot and is an improvement on the friction version used on the original. Now that I know it works, I plan to make a more accurate version (eg my drilling of the plate for the wheels). I also used 19mm shower door roller wheels but want to check they are strong enough!Attachment Deleted

[andreshs1]

Brilliant, thanks!