Store-bought body tubes only come in store-bought sizes. For a rocket project I wanted custom diameters, so I rolled my own from plain paper and thinned Titebond III — and they came out shockingly strong. Here's the whole technique, including the glue mistake I made on tube one so you don't have to make it on yours.
| Step | Rule |
|---|---|
| Strip width | 2× the tube diameter (¾″ tube → 1½″ strips; 2″ tube → 4″ strips) |
| Base layer | Wrapped dry, no gaps, no overlaps — taped at both ends only |
| Glue | Titebond III mixed 50/50 with water |
| Application | Glue goes on the paper strip, never on the form |
| Wraps | 5 for small tubes; 7+ for 2″ and up |
| Finish | Trim both ends square, past where the base layer was taped |
The one number that drives everything: cut your paper strips twice as wide as the tube's diameter. For the ¾″ tube I cut 1½″ strips; for the 2″ tube, 4″ strips. That ratio keeps the spiral angle shallow enough to wrap cleanly without wrinkling, but steep enough that each wrap advances down the form at a workable rate. Mark both ends of the sheet, connect the marks with a long straightedge, clamp one end so nothing shifts, and slice the strips with a knife.
The first layer wraps around your form (a dowel, PVC pipe, whatever matches your target inner diameter) completely dry — no glue — with no gaps and no overlaps. Tape it down at both ends with regular scotch tape. This layer is sacrificial: it's what lets the finished tube slide off the form instead of becoming permanently married to it. If your strip runs long, just tear it off flush.
Mix wood glue 50/50 with water and stir it until it's fully blended. I used Titebond III because it's what I had — any wood glue works. Thinning it matters: full-strength glue is too thick to soak into the paper, and the soak is the whole point. Wet paper plus wood glue dries into something closer to a composite than a craft project. Put down plastic or parchment first; this stage is not a clean stage.
On my first tube I spread glue onto the form and then laid dry paper over it. Don't do that. The paper stretches as it wets out and you end up chasing wrinkles and readjusting the base layer as you go — you can watch me fighting it in the video. The right method, which I switched to for the second tube: lay the strip on the table, coat the strip with glue, then wind the wet strip onto the form. The paper pre-stretches before it touches the tube, and the second tube came out dramatically smoother than the first.
The trickiest moment of each wrap is the start: take your time setting the spiral angle on the first turn, because every turn after it follows that angle. Get it right and the rest of the strip lays itself down.
Five wraps was perfect for the ¾″ tube — stiff, light, done. On the 2″ tube five wraps felt underbuilt; I'd go seven or more. Bigger diameter means longer unsupported spans of wall between "curvature," so bigger tubes need proportionally more wall. It's a repetitive process, but each layer goes faster than the last.
Once dry, cut both ends square — and trim past where you taped the base layer, since the taped portion isn't bonded like the rest. Yes, the tube gets a little shorter than the form. Plan for it by rolling a couple inches longer than you need. A square, clean end is what makes the finished tube look store-bought.
A finished tube is a fiber-reinforced laminate — the same idea as fiberglass, with paper as the fiber and wood glue as the matrix. Paper is surprisingly strong in tension along the sheet; its weakness is that a single sheet buckles and tears. Winding it in a spiral fixes both: each wrap's fibers run at an angle to the wraps below, so loads in any direction — crush, bending, torsion — always meet several layers of fiber oriented to resist them. The cured glue bonds the layers into one thick wall so they can't slide past each other, which is where buckling resistance comes from. Five layers of paper and glue behave nothing like five layers of paper.
The same technique earns its keep on the airplane bench:
If you're building up a scratch-building bench, my recommended gear page covers the tools I actually use, and the Airplane Designer is the free place to start a plane that could use one of these booms.
