Adjustable raking systems

Raking the rig moves the CoE aft, useful to balance with a raked centreboard for stronger winds. Moving the foot of the mast while leaving the shrouds and forestay fixed (effectively pivoting the rig around the hounds) would move the CoE forward by a smaller amount. AFAICS there are both similarities and differences between the effect moving the mast foot has on windsurfer and dinghy rigs but in both cases it comes down to balancing the rig CoE to the hulls CoLR. On a Raceboard we move the mast foot aft offwind and retract the CB so the CoLR is wall back under the straps for minimal wetted/planing area, upwind we want as much WL as possible so move the rig forward about 18".

Edited by Sam.Spoons - 17 Nov 20 at 12:54pm

Originally posted by Sam.Spoons Raking the rig moves the CoE aft, useful to balance with a raked centreboard for stronger winds. Moving the foot of the mast while leaving the shrouds and forestay fixed (effectively pivoting the rig around the hounds) would move the CoE forward by a smaller amount. AFAICS there are both similarities and differences between the effect moving the mast foot has on windsurfer and dinghy rigs but in both cases it comes down to balancing the rig CoE to the hulls CoLR. On a Raceboard we move the mast foot aft offwind and retract the CB so the CoLR is wall back under the straps for minimal wetted/planing area, upwind we want as much WL as possible so move the rig forward about 18".

Yep, I know all that, what I don't know and am always weak with is pulley systems.

And what the relationship should be for example between the fore stay and lowers/shrouds.

Edited by iGRF - 17 Nov 20 at 2:14pm

Originally posted by Grumpycat Re the supersofa . I thought they only have adjustable forestay and lowers . So not really what your looking for . Sure mr spoons  will put me right

Edited by Sam.Spoons - 17 Nov 20 at 2:32pm

I think you need to work out what you want the lowers to do as you rake.If you want the tensions v the uppers to remain the same then the calculation is easy. If though you want more bend as you rake the I would experiment with holes and pins before trying anything clever/expensive.

Correct me if I'm wrong here but I'm assuming other than use as a rigging aid the key use for lowers is to combat kicker induced lower mast bend. So, following that logic then the desire would be rake with neutral effect on lowers tension which mean as the rig rakes back they need their tension increased. Whereas, if the whole lot were sliding forward (ike someone mentioned back there with forestay sliders) in order to rake the mast fromthe foot then it would seem easier to have an arrangement where they all moved in concert, even leaving the forestay not necessarily needing much adjustment, hence my thinking...