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  • Regular price $4,303.00













This is a new generation futuristic sport jet from Aviation Design.

It has been entirely CAD designed and features stunning futuristic shapes with a design inspired from 1950s X projects like the Douglas X3 Stiletto flown by Major Chuck Yeager from December 1953 to July 1954.



This new generation of planes also represent the first jet in the model industry to have been entirely CFD designed: the unique proprietary airfoil, fuselage-to-wing interaction, rudder and stabilizer have all been carefully dimensioned and setup under Computational Flow Design with a market leading software. The airfoil was the object of a long study and is 100% custom generated by Aviation Design.

The result is a stunning looking plane with truly unmatched flight performance and has been conceived as a tribute to 1950s X projects and their amazing test pilots.



The CAD work took hundreds of hour of careful optimization and involved the usual techniques that make the new generation of Aviation Design airframes so light and so strong.

All the formers, spars and internal structure were carefully dimensioned and for optimal strength. The build is mostly using drilled Airex sandwich and an inner aero grade Finnish birch plywood structure.



The wing features a full plywood gear box with a thick plywood main spar and carbon fiber reinforcement. Two large aero grade alloy tubes are used to join both wings through the fuselage. The tubes are in one piece from side to side for optimal strength.



The rudder and stabilizer assembly has been carefully dimensioned and tested to avoid any type of flutter inducing coupling. The upper pod is full carbon fiber molded and the rudder spar/ tube joiner are made from thick plywood as well.



The fuselage main structure is mostly located to the rear of the plane and feature a full plywood assembly designed to hold the engine and rudder efforts.



The nose section of the plane feature a nose gear box and a removable battery tray on which the nose gear attaches, rendering servicing extremely easy.



The plane will fly optimally with our JB220 for full speed capability or JB180 for more reasonable flight characteristics.


The Ultimate Jets version that we sell was specifically optimized by Oli.

It is updated at our production line in Houston. The airframe is reinforced with carbon fiber tows and tapes in various strategical locations. It comes with a set of our UHM pressed carbon fiber servo hatch and a specific sealed carbon fiber bypass/ pipe that avoids any vacuum condition to spread in the airframe.


A complete accessory tray and loom is available as an option to improve the plane balance. The tray fits at the front of the plane in the nose section and feature a large air trap to help in shifting weight to the front. The engine loom is custom made to connect to the rear and is designed for the JB-220 to JB-180.




The plane comes with a set of carbon fiber servo hatch custom designed for the purpose by Ultimate Jets. We spent a considerable amount of time computing each flight control geometry to optimize the mechanical advantage and the servo torque required.


All the flight control analysis is available on the user manual.


The result of this study dictated the use of custom molded high modulus carbon fiber servo mount/ hatch. These were CAD designed and produced from male/ female aluminium moulds.




The plane was extensively tested on the ground ( static stress tests ) and in flight ( test flown with on-board cameras for any flutter or elastic oscillation condition).

We offer a gear door option for this plane using state-of-the-art techniques. The doors are carbon fiber 3D printed with 3D honeycomb internal structure. This is a World premiere and offers very light and extremely strong doors.

Here is a video of a test flight:


Diamond test flight 6 from Oli Ni on Vimeo.







Colour schemes available:


Plain grey primer and,


Silver/ red:



White/ gold:



 Blue racing/ carbon:



 Red racing/ carbon:


White racing/ carbon:


1950 NACA X3 prototype scheme in Flight metal/ white available on request for those who want to fly a Stiletto-like prototype with beautiful handling characteristics.


The Diamond is sold exclusively by Ultimate Jets with the following items: full carbon fiber servo mount/ hatch ( included ), ECU and engine MIL SPEC loom option, Flight controls MIL spec loom option, full carbon fiber bypass for JB-220/ JB-180 engines option.


Span: 2,47m/ 97"

Length: 3,35m/ 132"

Dry Operating Weight: 18-20kg/ 40-44lbs

Powerplant: 160N to 220N ( 35 to 45 lbf )



Accessories available here:

Behotec pneumatic gear

Behotec electric gear

Carbon gear door kit

Kevlar tanks


Thrust tube

Transparent canopy

Resin instrument panel

Pilot seat/ tank holder

1/3 scale PET plastic pilot

Protection covers

Engine tray + MIL spec engine loom

Full carbon fiber bypass for JB-220/ JB-180