user billdre suggested me this on another thread. In this thread, I voice my concerns about various turning block mounting options I've thought of. https://www.cruisersforum.com/forums...ls-237586.html
Vessel is a Bristol 30, and I'm trying to run main halyard
, 2 single
line reef lines (or double, I haven't decided yet), outhaul
, topping lift
and vang to the cockpit
My vang is mounted to my ast via through-bolt using a 3/8" bolt, as recommended to me by a professional rigger. Sheer strength for gr5 and gr8 bolts are close to 8000 lbs. Vang seems to see upwards to 4000lbs of load.
Calculations show, assuming 1200lbs of mainsail halyard
tension, the turning block will see upwards to 2000lbs forces. My best mounting solution was to have pad eyes through bolted to the mast
just above the vang.
Unfortunately, the biggest pad eyes that would let me do that will not survive a bad-case scenario (35kts with full sail up, esp with shock loading in the case of an accidental gybe).
So I'm revisiting the boom bail idea. If I drilled another through-hole right above or below the bail I use for the vang, and mount my turning blocks to that, it should be very very strong. It'll also solve all my geometry problems as the blocks would move with the boom on each tack. I'd share the same bail, but I don't want to overload an already very loaded piece of hardware
My only concern is that I'll have two highly loaded through-bolts of 3/8" diameter at two points, very close to each other, at the mast
. Would this be bad for the mast? I'm worried this would cause the aluminum
of the mast to deform.
Thank you in advance.