Will This Massive 5-Foot Plane Fly?

Building big from single sheets

The whole fuselage starts as flat 20×30 sheets: score lines, fold each one into a tube, glue. The rear tube gets an angled cut so the tail section tilts upward, a little triangle notch locks the tail in snug, and the servos live inside the fuselage with control runs back to the elevator and rudder.

Then the fun part — it's a cargo plane, so it needs a cargo bay: I cut a box out of the belly, taped the removed piece back on as a hinge (foam board's cheapest hinge), added a release servo up front, doubled the door with an extra foam layer, and padded the bay so cargo can't shift in flight.

A wing built to carry weight

The wing is where a cargo plane earns its name. I went back and forth on spar thickness because I wanted a thicker airfoil — a fatter wing section generates more lift at the slow speeds a hauler flies at. Each spar ended up four foam layers thick, which sets the airfoil height and carries the wing loading. Both halves fold from single sheets, with 8-inch tips on each side and dihedral built into the center joint for self-leveling stability.

Why this matters if you're designing your own: lift scales with wing area and airfoil, but weight scales with everything. A hauler wants a thick, generous wing and a modest wing loading — exactly the trade-off the Airplane Designer shows you when you pick the Cargo/Scale style.

Maiden number one: not quite as planned

The first flight was rough — flyable, barely, but temperamental. Back at the bench I made the changes that transformed it:

• Moved the CG a couple of inches back. The difference in handling was immediate — "our center of gravity is much better where we put it."
• Trusted the dihedral. With the balance fixed, the built-in dihedral finally got to do its job keeping the wings level through wide turns.
• Power was never the problem — the FT Radial "monster motor" on 6S had grunt to spare.

Maiden number two: it flies (mostly politely)

Flight two felt smooth almost immediately — wide level turns, good tracking, even a hands-off moment. Not the sportiest thing in the sky, but "not bad for a little cargo plane." A few honest notes from the flight log:

• Roll response stayed quirky — sometimes the rudder wouldn't produce the roll I expected. On a rudder/dihedral plane, roll comes indirectly from yaw, and a big heavy wing responds slowly; you plan turns early on a plane this size.
• "Three mistakes high." Testing altitude is recovery time. I keep it high enough during trials that I can fix a problem before the ground gets involved.
• "Oh no, I see smoke." A mid-flight smoke scare is your cue to land immediately and inspect — big planes pull big currents, and wiring that's marginal on the bench fails in the air. The glide tests right after proved the airframe itself was solid.

Build your own hauler

The spec sheet has everything: dimensions, the full electronics list, CG position, and my transmitter settings (mode 2, 30% expo, 70% dual rates). Scale it to your own size with the Airplane Designer, and document yours with the Spec Sheet Maker.