10.12.2020

UR-1 aircraft

Air Race E is competition where success does not only lie in the quality of piloting but in a multitude of factors.

To date, there is no 100% electric racing aircraft in the world. Each of the eight planes that take part in the race will have been built solely for this purpose. Whether it is the installation of high-performance batteries, a powerful motor or even the pilot interface, everything is new. Crossing the finish line will be an achievement in itself.

At Pie Aeronefs SA, we want to create a high-performance and innovative aircraft. While many competitors are reusing older generation fuselages and wings by incorporating electrical technology - a process called in the jargon "retrofit" - we decided to create a tailor-made aircraft.

The idea behind this choice is simple, we want to develop the most efficient aircraft in terms of mechanics and aerodynamics, but also to test new concepts that we can subsequently incorporate into commercially available planes.

General

Pie Aeronefs - Aircraft UR-1 - profile view
Mass: 373 kg
Wingspan: 6.6 m
Length: 4.7 m
Height: 1.5 m
MAC : M 0.93
Aspect Ratio : 7
VNE : 320 kts
Fixed landing gear

Engine

Pie Aeronefs - Engine & Propeller
EMRAX 348 engine

Our electric motor EMRAX 348 is intended to develop 150 kW (203 HP) during the race. It is fixed to a lightweight and sturdy carbon fiber propeller. The propeller has a fixed pitch, meaning that it is not possible to change the angle of the blade depending on the speed, as it is normally the case on powerful engines.

Motor
Mass: 41 kg
Size: 34.8 x 10.7 cm
Max power: 380 kW
Propeller

Mass: 1 to 3 kg
Diameter: 1.86 m

Batteries

Pie Aeronefs - Batteries

The aircraft will be equipped with a set of 12 high-performance batteries developed for our aircraft.

Each unit:

Mass: 8 kg
Dimension: 176 x 675 x 65 mm
Capacity: 1.15 kWh
Voltage: 55.5 V

V-Tail

Pie Aeronefs - V-tail

When a wing flies, the air flows around it in generating lift. However, all surfaces in contact with that flow also generate a certain amount of "drag".

There are basically two types of drag to which a wing is subjected: induced and parasite.

An airplane tail, also called "empennage", is generally made up of three surfaces: a vertical rudder and two horizontal stabilizers. When using a V-shaped tail, we reduce the number of surfaces inducing drag. The main effect is a noticeable reduction in the induced drag which will allows for our plane to go faster.