Originally Posted by FirstSightPS31
Thanks to both of you for the suggestions.
tjk1: your lovely family is blocking a good view of the attachment point in the bow for your block.
I think for now I have no option but to run a short strop back to a cleat. I should be able to go forward and release the line from the cleat, although not quickly. There will of course be no way to shorten the tack line under load.
Tim (tjk) is absolutely right, it's much better to rig a running tack line, adjustable from the cockpit.
But even with a fixed tack line, you can make adjustments to the luff tension by taking or easing on the spin halyard. It's not the preferred way, but it works alright.
I also wouldn't be too worried about the need to blow the tack line to prevent a broach. From my Melges 24 racing days, I know very well about this phenomena -- we laid that boat right over on its beam ends more than a few times. But there are several other things you'd want to do first to correct before a full blown broach ensued that necessitated releasing the tack line (drive down, ease main sheet, ease spin sheet, ease vang).
I'm not too worried about the broach situation because we typically only use the chute for sailing downwind in light-to-moderate air. Once true wind gets above 17 knots or so, that chute will be down -- long before broaching forces are coming into play. Compare that to racers, who will be putting those chutes up in all conditions even 30+ knots and will need to play that tack line.
No question, I'd prefer a running tack line. I only mention these other options as a "good enough" approach until you can get the better solution implemented.