Neutrino F5J from jimaero


The Neutrino F5J is an ultra-lightweight electric sailplane that is optimized for F5J competition. It features a 4-piece wing and 2-piece fuselage that lets it break down to a small size for transport. The longest parts when disassembled are the wing tips which are 44 inches (1120 mm).

The wing has series of transitioning airfoils designed for ultra light F5J gliders. This airfoil combo has great performance throughout a wide speed range, plus excellent reaction to changes in flap deflection, depending on the flight mode. The wings are tails are built with solid core construction using Rohacell cores. I am very excited and honored to review the Neutrino so let's open up the box and get this project started.

The wing of the Neutrino F5J consists of 4 parts, the fuselage consists of 2 parts, which greatly simplifies its transportation. The longest part is the wing tip has a length of 1120 mm.

The wing Neutrino has serie of airfoils DI8120...820 specially designed for ultra light F5J gliders. It has thickness changing from 6.9% on the root to 5.0% on the tip, that much thinner than airfoils for F3J that are used for F5J early. This airfoils has great performance in wide speed range due to special geometry and the explicit reaction to the change of the flaps position depending on the flight mode.

The wing and tails made by solid core technology from PMI foam (Rohacell core). Neutrino is available in two versions.

Standard version has about 1350 g flying weight. Its wing made from checkered carbon fabric 62 g/m. Standard version can be used with ballast.

Light version has flying weight from 1150 g. In this version wing made from spread carbon 28 g/m2 and has less rigid spar. Light version is not recomended for using with ballast.


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Wingspan: 3950mm (155.5 in)
Length: 1830mm (72 in)

Weight: 1150 g (2.5 lbs)

Wing Area: 79.2 dm2
Wing Airfoil: DI 8120...820  6,9... 5,0%
Wing Loading: 14.5 g/dm2
Aspect Ratio: 19.9
Spinner Diameter: 32mm
Designed by: Dimitri Irkhin

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