It's a 1988. It has a Randy Smyth mainsail and a Danger (I think) jib. I fixed the batten pockets and a couple other spots on the main and should have probably replaced it ($200). The boat was not in bad shape but I should have looked at it more closely after driving 1,000 miles. He said the wing tube was fixed on one side but found out that all four were broke. It had two inspection port on the back but I added two on the front right in front of the cross bar. Put the wings in and glassed it to be bullet proof. I'm now replacing bolts that were used instead of rudder pins with the right parts.
A couple things I learned (the hard way): 1) when trailering any distance make sure you bungee/tie the jib block up to the wing or over to the center board so it lays on the hull. For me the block almost rubbed a hole in a very good tramp. 2) The wings need to be seated ALL the way down and on the right side. When you are sure you get them down mark the spot and label the side (I used a silver Sharpie some people say tape (red and green could be good)). When I didn't realize I didn't have it down all the way (didn't know pocket was broke just above the structural support) it cracked the inner tube worse, not that it really mattered much after I got into the repair but I thought I really screwed up on the lake. 3) I have had 14,16 & 17 Hobies none had a furling jib and I didn't know what to do with all the extra rope originally. The guys helped tell me that you need a small piece that will attached after the jib is raised and go into the cam (30" I think) 4) I came with Cat Trax and they are worth their weight in gold. I hate launching at ramps prefer grass beaches and if you can't back to the water they are great.
I'm still not sure I mastered getting the ring in hook at the top of the mast. And next spring I need to flip it see how hard it is to right. I always did the 16 & 17 by myself so I'm hoping the 21 isn't as hard as some make it out to be. That being said I can't imagine flipping it unless you are trying to hold a hull up to the highest point. I'm use to the 16 when you see the wind coming and it hit digging in and trying to lift up as much as going forward. The 21 felt like someone hit the nitrous switch as all the energy went forward. It came with one trap wire and I just got in two more so I can have all three kids trap of one side.
If you want to talk more drop me your number and I'll give you a call (Bill if you want to give me a call and share any wisdom I would love to visit).
Drew - Sail #40, Hull # firstname.lastname@example.org