On top of my ailing eyesight, the length numbers on my boom are becoming unreadable from scratching. Is there a lasting way to highlight the typical lengths I use ?


Mast extension seems to be going the same way too.

tape off a stripe ..on half the arm or arms .then use a white spray can ..spray ...then use a permanent texture to mark your numbers on .

or a white texture ..works too ..I always carry glasses in the trailer now in the screw driver box 😎.price for getting old 😂

The numbers aren’t strictly correct, the boom length varies depending on boom height, shorter with a low boom and longer with a high boom. Most people simply adjust the boom length accordingly after setting the down haul, so the printed numbers aren’t needed.

Imax1 said..
I never read mine.

I can't count or add up anyway 😀

mark62 said..
The numbers aren’t strictly correct, the boom length varies depending on boom height, shorter with a low boom and longer with a high boom. Most people simply adjust the boom length accordingly after setting the down haul, so the printed numbers aren’t needed.

The idea that boom height makes a difference is attractive, but it doesn't stand up to maths.
Pythagoras theorem kills it. Say you have a small wave sail with 150cm outhaul and the boom perpendicular to the mast in the middle of the cutout.
Moving the boom up or down by 10cm changes the length to the clew by 0.3mm.
Even a 20cm deviation results in only 13mm change.
The change is relatively smaller as the boom gets longer. At 200cm a 20cm move on the mast is only 10mm at the clew