What engine size does the 108" Bird Dog need?

Vailly Aviation specifies 38–50cc gas for the 1/4 scale version. The DA-50R or DLE-40 are popular choices for this weight class. At 18–24 lb finished weight the Bird Dog remains docile and forgiving at this power level.

What's the difference between the 88.5" and 108" Bird Dog kits?

The 88.5" version is 1/5 scale (23–35cc, 11–14 lb) and the 108" version is 1/4 scale (38–50cc, 18–24 lb). Both are Vailly Aviation designs. The 1/4 scale has more presence in the air and suits higher-power setups. Accessories are not interchangeable between scales — confirm you are ordering 1/4 scale parts.

What is the Cessna L-19/O-1 Bird Dog?

The Cessna L-19/O-1 Bird Dog was the U.S. Army's primary liaison and observation aircraft from the Korean War through Vietnam. It was the first all-metal fixed-wing aircraft ordered by the Army after the Air Force separated in 1947. Light, slow, and highly maneuverable, it served in forward air control and artillery spotting roles throughout its career.

Kit Cutters Completion Guide

Vailly Aviation Giant-Scale Short Kit — 1/4 Scale

108" L-19/O-1 Bird Dog

The U.S. Army's legendary liaison and observation aircraft in 1/4 scale — more presence, more power, same docile character.

Buy the Kit — $288.00 See Everything You Need

Wingspan

108 in

Length

73 in

Scale

1/4

Weight (AUW)

18–24 lb

Power

38–50cc gas

Gear

Fixed tailwheel

Skill

Intermediate

A Legend, Faithfully Cut

The Cessna L-19/O-1 Bird Dog was the U.S. Army's primary liaison and observation aircraft from the Korean War through Vietnam — light, slow, and highly maneuverable, used in forward air control and artillery spotting for over two decades. Vailly Aviation's 1/4 scale design steps up the presence and power from the 1/5 scale version while keeping the same docile flight characteristics that make the Bird Dog one of the most approachable giant-scale builds available.

Kit Cutters supplies the precision laser-cut wood. This guide covers the rest: the honest, model-specific list of what you'll buy to complete it, with real sources for every part.

108-inch Vailly Aviation L-19 Bird Dog 1/4 scale giant-scale RC plane in flight

What's in the Box?

Included in the Short Kit

Precision laser-cut wood parts only — ribs, formers, shaped parts
Two-piece wing rib set
Fuselage formers and shaped parts

⬇ Download Pack List (PDF)

Required Separately

Plans / building instructions (buy from Ziroli — copyright)
Spars, sheeting, and stick balsa
Engine, cowl, landing gear, covering, finishing, electronics
Fuel tank, prop, servos, hardware, hinges

Everything Else You Need to Complete This Kit

Model-specific, with real sources. All specs follow Vailly Aviation's published 1/4 scale L-19 specification. Confirm you are ordering 1/4 scale accessories — the 1/5 scale versions are not compatible.

Power System

Gas

Vailly specifies 38–50cc gas for the 1/4 scale. The DA-50R is a popular choice, providing strong performance while keeping the finished weight in the 18–24 lb range.

Engine	38–50cc gas. DA-50R or DA-35 at the lower end; ZDZ-50 used by builders wanting more authority.	Desert Aircraft
Fuel tank	24 oz rectangle tank (plan spec)	Dubro
Prop	Size per engine and cowl clearance; 22" prop used by builders with the ZDZ-50	Builder preference
Engine offset	0° right, 0° down (per plan)	Per plan
CG location	4.5" back from leading edge at fuselage	Per plan

Cowl

Vailly Aviation sells

L-19 fiberglass cowl — 1/4 scale

11.5" L · 5" H front · 10" H rear · 10" W front · 10" W rear. Order the 1/4 scale version.

Ziroli (Vailly)

Vailly Aviation's cowl and aluminum gear are available through Nick Ziroli Plans. Specify the 1/4 scale version — the 1/5 scale cowl is not compatible with this kit.

Landing Gear

Vailly Aviation sells

Aluminum gear struts	Formed aluminum main gear struts — 1/4 scale	Ziroli (Vailly)
Tail gear strut	Tail gear strut per plan	Secondary R/C Market
Main wheels	5" diameter main wheels (plan spec)	Robart / Dubro
Tail wheel	2" tail wheel (plan spec)	Robart / Dubro

Servos

5+ channels

Flaps	2× 150–200 oz-in, metal gear, ball bearing (plan spec — large flaps, high torque required)	Builder preference
Ailerons	2× 90+ oz-in, ball bearing	Builder preference
Elevators	2× 90+ oz-in, ball bearing	Builder preference
Rudder	1× 120+ oz-in, ball bearing	Builder preference
Throttle	1× 50 oz-in, ball bearing	Builder preference

The Bird Dog's full-span flaps deploy to 45° and require substantial servo torque — don't underspec the flap servos. Same spec as the 1/5 scale version.

Covering & Finishing

Covering	1 oz fiberglass cloth and resin, or Solartex cloth covering (plan spec)	Chief Aircraft / specialty
Vinyl graphics	L-19/O-1 Bird Dog graphics set	Callie Graphics

Hardware

Hinges	20× Dubro #257 flat hinges (plan spec)	Dubro
Control horns & linkages	Sized per plan	Specialty RC retailer

Detailed Specifications

Wingspan	108 in
Fuselage length	73 in
Scale	1/4 (3" = 1 ft)
Weight (AUW)	18–24 lb
Power	38–50cc gas
Wing	Two-piece high-wing, with full-span flaps (45° down)
Gear	Fixed tailwheel — aluminum struts
Cowl length	11.5" · Front: 5" H · Rear: 10" H · Width: 10" front / 10" rear
CG	4.5" back from leading edge at fuselage
Main wheels	5"
Tail wheel	2"
Min. radio channels	5+

Specs from Vailly Aviation's published Cessna L-19 1/4 scale plan specification, sold through Nick Ziroli Plans. Also available in 1/5 scale (88.5" span) and 1/3 scale. Confirm you are ordering 1/4 scale accessories — they are not interchangeable with the 1/5 scale versions.

Vailly Aviation

Vailly Aviation (Roy Vaillancourt) produces some of the most respected giant-scale observation and liaison aircraft plans in the RC community. The L-19 Bird Dog is available in three scales (1/5, 1/4, 1/3) and is known for docile flight characteristics and excellent plans quality. Plans and accessories are distributed in the US through Nick Ziroli Plans.

Plans distributed by Ziroli Plans · Plans must be purchased separately (copyright).

Get Vailly Plans

The Build Journey

The 1/4 scale Bird Dog shares the same approachable build character as the 1/5 scale — fixed gear, conventional layout, no complex systems. The larger size makes sheeting and handling slightly more involved, but the basic structure is the same proven Vailly design. Treat these ranges as a rough sense of scope, not a fixed estimate.

Where a short kit saves you time

Vailly Aviation's plans show all structures drawn full size with full-size templates for all ribs, formers, and parts. A Kit Cutters short kit removes the entire cutting stage — your parts arrive precision laser-cut and labeled, so you start at assembly with a cleaner, more accurate fit.

Plans only (hand-cut)

You trace and cut every rib, former, and shaped part from raw stock using the plan templates, then build.

more time, lower part cost

Short kit (laser-cut)

Parts arrive cut and labeled. Skip straight to assembly with a cleaner, more accurate fit.

less time, cleaner fit

The four stages of assembly

Stage 1: Fuselage Assembly

The Bird Dog's distinctive boxy fuselage with large greenhouse cabin windows.

Align and pin main fuselage formers
Build the cabin frame
Install firewall and engine mount
Fit tailwheel gear mounting

Stage 2: Wing Assembly

Two-piece high-wing with full-span flaps.

Build port and starboard wing panels
Install full-span flap hinges and linkages
Fit wing strut attachment points
Install aileron servos

Stage 3: Tail Assembly

Conventional tail group.

Build the horizontal stabilizer
Build elevator surfaces
Assemble fin and rudder
Install tail wheel assembly

Stage 4: Systems & Final Assembly

Engine, radio, covering, and final checks.

Install engine and cowl
Install aluminum main gear struts
Radio gear and covering
Verify CG at 4.5" from leading edge

Frequently Asked Questions

The short kit is laser-cut wood parts only. To complete it you'll also need the Vailly Aviation plans, spars and sheeting, a 38–50cc gas engine, fiberglass cowl, aluminum landing gear, covering, and finishing supplies. The "Everything Else You Need" section above lists each item with a source.

Vailly Aviation specifies 38–50cc gas for the 1/4 scale version. The DA-50R is a popular choice. At 18–24 lb finished weight the Bird Dog remains docile and forgiving — the ZDZ-50 is also used by builders wanting a bit more authority.

Plans are purchased separately from Nick Ziroli Plans (ziroligiantscaleplans.com), who distributes Vailly Aviation plans in the US. The 1/4 scale L-19 plan is $50. Kit Cutters supplies the laser-cut wood; Ziroli supplies the plans and model-specific accessories including the cowl and aluminum gear.

The 88.5" version is 1/5 scale (23–35cc, 11–14 lb) and the 108" version is 1/4 scale (38–50cc, 18–24 lb). The 1/4 scale has more presence in the air and suits higher-power setups. Accessories are not interchangeable between scales — confirm you are ordering 1/4 scale parts.

Yes — the Bird Dog is one of the most approachable giant-scale builds available in either scale. Vailly describes it as having docile flight characteristics, and the fixed gear and conventional layout make it far less complex than the warbirds. The 1/4 scale gives more presence in the air than the 1/5 scale with the same forgiving nature.

No. The short kit is wood parts only. The 1/4 scale fiberglass cowl is sold separately through Nick Ziroli Plans (Vailly Aviation). The aluminum landing gear struts are also sold separately. Specify 1/4 scale when ordering — the 1/5 scale versions are not compatible.

The Cessna L-19/O-1 Bird Dog was the U.S. Army's primary liaison and observation aircraft from the Korean War through Vietnam. Light, slow, and highly maneuverable, it served in forward air control and artillery spotting roles for over two decades and remains one of the most beloved military aircraft among scale modelers.

108" wingspan, 73" length at 1/4 scale. Finished weight is 18–24 lb. These figures come from Vailly Aviation's published L-19 1/4 scale specification.

Ready to Build Your 108" L-19/O-1 Bird Dog?

Buy the 108" Bird Dog Kit — $288.00

Prices and availability are subject to change — verify on each vendor's site before ordering. Kit Cutters supplies laser-cut wood parts only; plans and accessories are sold by their respective vendors.

Premium laser-cut short kits for large-scale and giant-scale radio-controlled aircraft builders. USA-based quality craftsmanship for serious hobbyists.