1/5 Scale RC Planes: Sizes, Power and What They Take
A 1/5 scale RC plane is one-fifth the size of the real aircraft. For a WWII fighter with an 11–12 m wingspan, that means a model of roughly 2.2–2.4 m; smaller aircraft give smaller models. 1/5 scale sits between common sport sizes and giant scale (1/4 and larger), and is popular for warbirds and scale civil aircraft. They’re usually powered by gas engines or large electric systems, and they fly smoothly and realistically but need space, transport and a good budget.
By Kyle HilsonUpdated: October 20263 min read
How big is 1/5 scale?
| Real aircraft span | 1/5 model span |
|---|---|
| 8 m (light aircraft) | about 1.6 m |
| 11.3 m (P-51 Mustang) | about 2.26 m |
| 12.5 m (F4U Corsair) | about 2.5 m |
| Larger aircraft | Grows quickly |
Divide the real span by five; real spans vary by variant.
Power
Many 1/5 scale planes are sized for 30–60 cc gas engines, or the electric equivalent. A common question is what electric motor to use for a plane designed for a .60-size glow engine: as a guide, aim for roughly 150–250 W per kg of flying weight, so a 3 kg warbird needs around 450–750 W, often a 6S system with a motor in the 50-size class. Measure current with a watt meter and follow the maker’s prop recommendations. Motor sizing is explained in RC electric motors for airplanes.
Popular subjects
- WWII fighters (P-51, Spitfire, Corsair, Bf 109).
- Trainers like the T-6 and T-28.
- Civil aircraft such as Cubs and aerobatic planes.
- Scale gliders.
Practical needs
- A vehicle that fits the fuselage and wings.
- A field with a good runway.
- Strong digital servos and retracts if fitted.
- A reliable power system and receiver power supply.
- Registration and insurance where required.
Practical aspects of big planes are in large-scale RC planes.
Flying a 1/5 scale plane
Bigger planes fly smoother and more realistically than small ones, are less affected by wind and are easier to see. They also carry more energy, so landing approaches must be well planned. Practise on a smaller version of the same type, or a simulator, before the first flight. Have an experienced pilot check the setup.
Before buying
- Transport and storage space.
- Power system budget.
- Servos and retracts.
- Club field suitable for large planes.
- Your experience with smaller warbirds or sport planes.
Kits and ARFs
1/5 scale planes are sold as balsa ARFs, composite ARFs, foam models in some cases, and kits or plans for builders. ARFs save months of building but still need a careful setup. Composite models are lighter and stronger but cost more. Check whether retracts, flaps and scale details are included and what servos the maker recommends, since large surfaces need strong servos.
Costs
Besides the airframe, budget for the engine or electric power system, batteries or fuel, high-torque servos, retracts if needed, a reliable receiver power system and a propeller. Transport and storage space are hidden costs too.
Many clubs have members who fly 1/5 scale warbirds and can advise on setup, power systems and first flights. Watching their planes fly is also the best way to decide whether this size is right for you.
FAQ
How big is a 1/5 scale P-51?
About 2.26 m span.
What motor for a .60-size plane?
Roughly 150–250 W per kg; often a 6S setup for a 3 kg model.
Gas or electric?
Both work; gas gives longer flights.
Is 1/5 scale giant scale?
It’s just below; giant scale usually starts around 1/4.
More on this topic: the complete RC Airplanes guide covers the basics behind this article.
About 20 years in RC. Mostly boats in the NAVIGA Mini Eco Expert class, with many self-made parts; also a King Motor Baja 5B, a home-built electric plane, home-built nitro planes he has flown, and an RC helicopter. More about SwellRC
