Eric Robb RC Eric Robb EricRobbRC.com · Builds · Tools · Custom Parts
Pre-cut kit · laser-cut to order

ER Sparrow Mk II
Pre-Cut Kit

The 30-inch trainer, cut for you.

Every foam part of the ER Sparrow Mk II laser-cut from white Adams Readi-Board with the fold lines scored, plus the 3D-printed motor mount, the skewers, and the plans as a download. You add the electronics and the glue, and start at the fun part.

$29.99 per kit · plus $14.99 US shipping at checkout

  • Every foam part laser-cut and scored
  • 3D-printed motor mount included
  • Bamboo skewers for spar and pushrods
  • The plans and build guide, as a download
  • White Adams Readi-Board
  • Cut to order, shipped flat
  • Flown on camera
  • Cut from the plan file
  • Electronics not included

Skip the cutting. Keep the building.

The same airplane as the plans, from the same file, on the bench in one evening.

What’s in the box

One Airplane, Ready to Glue

  • ✓Every foam part, laser-cutWing, fuselage, tail and spars, from two sheets of white Adams Readi-Board, fold lines scored
  • ✓3D-printed motor mountFor the 2212-class motor the build guide specifies
  • ✓Bamboo skewersFor the wing spar, the hold-down and the pushrods
  • ✓The plans and the build guideAs a download the moment you pay: tiled and full-size sheets, 8 pages of guide

Not included: electronics, glue, tape. The motor, ESC, battery, prop, servos and radio are yours to choose; the beginner kit page lists a matched set. Hot glue and packing tape are in any hardware store.

The full-size plan sheet the kit is cut from, every part outlined at 1:1
The kit is cut from the same file these plans were drawn from.
What you add

The Electronics, Then Glue

The setup in the build guide, the one the airplane was flown with. It carries over to the next airplane, so it is the part worth buying well.

Motor2212-class, about 1400 Kv
ESC30 A with BEC
Battery3S 1300–1500 mAh LiPo
Prop8×4 or 9×6
Servos2 × 9 g, rudder and elevator
Radio4+ channel transmitter and receiver
Glue and tapeHot glue; packing tape for the leading edges

The matched electronics list → Check a set you already own

The finished ER Sparrow Mk II 30-inch foam-board trainer on a cutting mat, from the cover of its build guide
The build

An Evening at the Bench

The build guide takes it from flat parts to a balanced airplane in eight pages: the wing with its spar and dihedral cuts, the fuselage folded from one flat into a square tube, the tail, the controls, the wiring, the balance point and the first flight.

The fuselage fold is the one technique worth a practice piece; the tube-fold guide shows it with the scores already cut, which is what the kit gives you.

  • Flown on cameraThe one-hour plane from the 1 Minute / 1 Hour / 1 Day build, refined and drawn in CAD.
  • Free revisionsRev 3 today. Every future revision of the plans is free to kit buyers too.
  • The tools are freeThe checklist builder, the wiring designer and the balance calculator all know this airplane.
Shipping and the foam

Cut to Order, Shipped Flat

Each kit is cut when it is ordered and packed flat between stiffeners in a long box. US shipping is a flat $14.99, tracked, added at checkout; anything small from the shop in the same order rides in the box for nothing extra. Eric emails a dispatch date after you order.

  • The foam is white Adams Readi-Board, paper-faced. Keep it dry until the airplane is built and taped; humidity softens the paper.
  • One box is one airplane. A class or a club wanting several should ask for a quote rather than order ten.
  • Local? Email before ordering and collection can be arranged instead of shipping.
Goes with the kit

Label It. Mark the Battery. Keep It Plugged In.

The small parts I use on every build, sold here too. Each is added to the cart on its own.

A red and green XT60 battery status cap

XT60 Battery Status Caps

Green end out means charged, red end out means flown. Handy once you own a second pack.

$11.99 12-Pack

Common questions

Questions before you order

Yes. The download page with the tiled and full-size plan sheets and the 8-page build guide opens the moment payment clears, so you can read the guide while the foam is being cut.
No. The kit is the airframe: the foam parts, the motor mount and the skewers. You add a 2212-class motor of about 1400 Kv, a 30 A ESC, a 3S 1300 to 1500 mAh battery, an 8×4 prop, two 9 g servos and a 4-channel radio. The beginner kit page lists a matched set.
White Adams Readi-Board, the paper-faced foam board the plans were drawn for. Keep it dry until it is built and sealed; paper-faced board does not like humidity.
On a laser, to order, from the same file the plans were drawn from. Fold lines are scored, not cut through, so the fuselage folds where it should.
A flat $14.99 anywhere in the US, charged at checkout, with tracking emailed when it ships. The parts ship flat in a long box, and any labels, locks or caps in the same order ride in it for nothing extra. If you are near Eric and would rather collect, email before you order.
Each kit is cut when it is ordered, not held on a shelf. Eric emails a dispatch date after checkout; ask before ordering if you need it by a particular day.
Yes, for $8 on the plans page. The kit is for people who would rather start at the gluing than the cutting.
Hot glue for the airframe and packing tape or similar for the leading edges, as in the build guide. Neither is included.

Something else? Ask Eric — the answer gets added here if it would help the next builder.