Eric Robb RC Eric Robb RC RC Builds · Custom Parts · Backyard Engineering
Free Plans · Real Builds

Free Foam-Board RC Airplane Plans

Every plan on this page is free and comes from a plane I actually built and flew on camera. Start with the 30-inch, 3-channel trainer: two $1.50 sheets of foam board, a measured cut list with a printable one-page cut guide, about two hours of building, and roughly $140 all-in the first time. The other plans scale from a $1 single-sheet quickie to a 79½-inch cargo hauler — dimensions below, full build write-ups behind every card.

Start Here

The 30-Inch First Trainer

30″ span · 8″ chord · 30″ fuselage · ~1 lb · 3-channel

My most-watched build and the plane I tell every beginner to make first. About 2 hours and two sheets of foam board, with the full parts list, wiring, radio setup, and first-flight guide on one page.

Full plan & build guide →
Printable

First-Plane Cut Guide

One page · every panel dimensioned · CG 2¼–2½″

The 30-inch trainer as a print-and-cut sheet: wing blank ≈16–17″×30″, fuselage strip 10–11″×30″, tail sizes, throws, and setup targets. Print it, tape it over the bench, build.

Print the cut guide →
$1 airframe

The 30-Minute Plane

One 20″×30″ sheet · tail ~9½″×6″ · rudder/elevator

A whole flying airframe from a single sheet of foam board in half an hour — C-channel folds, a scored-camber airfoil, and CG one-third back. The cheapest possible way to find out if you love this hobby.

See the 30-minute build →
Floaty

The 30-Inch Slow Flyer

30″ span · 30″ length · ~6¾″ chord · ~264 g · 3S 850mAh

An undercambered wing that makes lift at walking pace. Full specs on the page: motor, ESC, CG at ~2″ from the leading edge, and the transmitter settings. Hand-launch, belly-land on grass.

See the slow flyer specs →
3 builds in 1

The 1-Hour Plane (& the 1-Day Bush Plane)

30–40″ class · rudder/elevator · box fuselage

Three planes against the clock. The 1-hour build — straight wing, spar, dihedral, box fuselage — flew so well it embarrassed the 1-day bush plane with flaps, LEDs, and 3D-printed gear. Both are on the page.

See all three builds →
Big build

The 5-Foot Cargo Plane

79½″ span with tips · four-layer spars · cargo bay door

No plans, just foam and trial and error: a thick airfoil for slow-speed lift, spars four foam layers deep, a working cargo door, and the CG fix that turned a scary maiden into a flyer. Not a first build — a goal build.

See the 5-foot build →
Want a Different Size?

Design a custom plane to any size

These plans are fixed sizes that I know fly. The Airplane Designer generates a new plan for any wingspan from 18 to 400 inches — chord, CG, dihedral, power system, and a to-scale drawing, sized around how you want it to fly.

Open the Airplane Designer → All build write-ups

Worked example: two sheets into a 30-inch trainer

Here's exactly how the foam breaks down on the first trainer. Sheet 1 becomes the wing: one 30″-long blank about 16–17″ wide — the bottom skin plus the top skin that folds over the leading edge — with the ~1″ spar strip cut from the offcut. Sheet 2 becomes the fuselage and tail: a 10–11″×30″ strip folds into the 2½″ box fuselage, and the horizontal stab (5″×12″), vertical fin (8″×5″), and doublers come out of what's left. Total airframe cost: about $3 in foam. Cut a couple of inches long where you can and trim to fit — foam board forgives.

The most common mistake: starting with the big one

The 5-footer is the plan everyone wants to build first, and it's the one that ends the hobby for people. Big planes aren't just scaled-up small planes — my 79½″ cargo plane needed spars four foam layers thick, real current, and a heavier wallet when it hit the ground. A 30-inch plane crashes for pocket change and rebuilds in an evening, which is exactly what you want while your thumbs are learning. Build the 30-inch class until landings are boring, then go big. If you're brand new, the Start Here path puts the whole sequence in order, and my first-plane parts list covers the electronics all of these small plans share.

Common Questions

Foam-board plans, answered

They're dimensioned cut lists rather than 1:1 plotter files — every panel has its measurements, so you print the one-page cut guide at any size, then measure and cut to the numbers with a ruler. For foam board with mostly straight cuts, that's faster than taping 20 sheets of tiled plans together.
20×30″ paper-faced foam board, about 3/16″ thick. Readi-Board from Dollar General is around $1.50 a sheet and is what I build most planes from; Elmer's 20×30 board by mail is the same class of material if there's no store nearby.
The 30-inch trainer takes about two sheets — one for the wing blank and spar, one for the fuselage strip and tail. The 30-minute plane flies on a single sheet. Buy four or five so you have spares for repairs; it's the cheapest part of the hobby.
Not by simple multiplication — weight grows faster than wing area, so a doubled plan needs disproportionately more wing, spar, and power. The right way is to redesign at the new size: the Airplane Designer takes any wingspan from 18 to 400 inches and recalculates the chord, CG, power system, and structure to match.
The 30-inch class planes all fly on the same set: a 2212-class ~1400Kv motor, 30A ESC, 3S 1300–1500mAh LiPo, 8×4 or 9×6 prop, and two or three 9g servos. That set moves between airframes — see the complete first-plane parts list for the exact picks.
Next in the Eric Robb Builder System

Next: choose your electronics

Plan picked? Get the matched motor, ESC, battery, prop and servo set sized to that exact wingspan.

Open the Checklist Builder → All tools