These old catamarans are in good shape after years in the sun, but those trampolines just go to pieces.
Here's the tramp before and after some attention from the tool-using ape.
Step 1: Set Up Your Workspace
Step 2: Take Pictures of How It Was
If your boat has no tramp at all, you can refer to these.
Step 3: Remove the Old Tramp
To save time you could cut the lacings.
I re-used mine, but your tramp will look a whole lot better with new rope.
Step 4: Lacing Strip
This one is cracked and weak so I'm going to wrap it with cloth.
I keep it inside the new cloth so I can lace through the grommets.
Not having to buy and set new grommets is what makes this method so cheap and fast.
I'm fortunate to have a heavy sewing machine handy. As long as I don't hit any grommets with the needle the sewing goes well. When I'm done sewing I slide it back into the extrusion and cut slots through the grommet holes.
It's strong but it looks like crap because it's scrap cloth with crazy sewing and cut threads all over it. Don't worry about that.
As soon as the lacing is on there, the human eye will be mesmerized by the lacing and the cloth will be a blue blur. Have you ever wondered why corsets are so popular? To look at anyway?
Step 5: Trace the Tramp Half
I've got a million pounds of scavenged truck tarp material, so I decided to use that.
PVC manufacturing is evil, don't buy any new stuff, but the planet loves you for scavenging.
This fabric is the same stuff we used to make the new skin for the Cozy Boat
It's heavy PVC laminated onto polyester cloth. It's a "gym floor cover" from MIT. They used it to protect their basketball court from spilled wine and high heels during wine-and-cheese events.
It's the same stuff trucks use to cover their loads of dirt, rocks, earthmoving equipment, etc.
Lay the tramp half upside down on the cloth. Trace it. Cut a few inches outside the lines as shown. Cut all the way to the tramp corners as shown.
Step 6: The Pocket
I thought I'd sew it on first. That was a mistake. It should go on last so you can sew the flaps on the underside of the ttramp down without sewing the pocket closed.
Step 7: Hatch Marks
The two surfaces of the tarp are different. One side has more texture from the internal fabric. The other side has a thicker, smoother coating. Figure out which surface you want up. I opted for the thick surface up for longevity.
Step 8: Sew Around the Edges
Step 9: Cut Off the Rotten Cloth
Step 10: Sew Down the Flaps
Step 11: Foot Strap
Step 12: Finished Tramp Half
This is the second one, so I didn't stitch over the pocket and it's just generally better. But this is just supposed to get the boat on the water, not impress obsessives with displays of compulsive craftsmanship.
Step 13: Installation!
Step 14: Side Track
Spray soapy water on everything and slide it into the extrusion on the hull.
Step 15: Slots
Step 16: Lacing
Lace up your tramp.
Step 17: Go Sailing!
For comparison, here's the Hobie 16 trampoline I re-did with Sunbrella fabric.