venerable 70 H16 project

that slop in the hulls is caused from the pylons getting worn or corrodded inside the cornor castings. An easy fix to your problem is to undo and drive out the bolts holding the hulls to the castings and slide out the pylon. (secure the hulls first!) clear out the vent tube inside the front pylons with a hanger or something then cut up an old beer can or two and flatten it out. Wrap it around the pylon and use a rubber mallet to pursuade the parts to go back together. Drill or punch a hole for the bolts this will stop the hulls from freewheeling on you not that that is really a big deal UNLESS a pylon is cracked or otherwise seriously damaged. Util then I recommend trailering and parking with the plugs out so pressure does not build up in the heat of the day

Hey Dave, isn't that fiddle block the exact same thing you sent me? It works great, I can actually pull the wrinkles out of the main now.
I've had the Nacra out 16 days now, am off till Sept 10, so I hope to break 30-40 before mid Sept.
Got the kids out on the wire, & my wife in 20 kts, man does that thing fly.
I went out solo once in almost 30 mph, could barely keep it rightside up, even depowered. Blew it 4 times trying to tack, it is definitely tougher when the wind gets up. I chickened out, once I got it turned around I skedaddled for chicken harbour (home dock) & waited for the wind to go down.
Yesterday the wind was at 35 clicks (22mph)took my wife on a picnic. We had lawn chairs, cooler & anchor on board, & she didn't feel like trapping out, so I arranged the flight paths so as to sail a less powerful route. Went 8 miles down to a provincial park beach. Man, that is the life, those guys on the ocean have it made. It really makes for a great day to just pull it up on the sand & take a break.
On the way home, just off the beach, as we cleared some anchored boats a bright yellow Hobie 16 pulled up & chatted a bit. He asked what is a Nacra, & if we could get any speed up with all the crap we had on board. I told the wife to put on the harness & hook on. She is only 120, if I dunk her, & I didn't have a harness, so I couldn't utilize the full power of 22kts wind. I told the guy I was pretty new to Cats & jokingly told him to try & keep up as we headed over to 8 mile point. Man, it was easy to outrun him, I can see now how racing becomes an affliction. I kept things pretty conservative,as I didn't relish dumping with all that gear. He was quite impressed, with the speed & how smooth it rode, blasting through 3' swells & powerboat wakes.
So now the "fleet" is myself & 2 Hobie 16s. There is a Hobie 19 just down the shore from me, but I've never seen it rigged.

Some kind of boom vang was one of my guesses too. (The downhaul being kind of weak.) There's an attachment point on the boom, but I don't see where the other end would attach.

The other thought was some obsolete bit of jib rigging.