An engine reduced in performance (300 rpm instead of 36 000 rpm) with transformer. Next step: assembly of the unit in a delta structure under real operation and dynamic flight (to complement the static tests); all the assembly will be build in Windform XT.
Manufacture of the Turbines in PA12: with 3 blades, 5 blades, 7 blades, 9 blades, 11 blades.
Assembly of the engine in the stator: no final adjustement needed, perfect assembly of the other parts and very good fitting: no friction or parasitizes vibration while working.
Number of revolutions of the engine 36 000 rpm for this application; best vectorial push obtained at the first assembly: initially tests done only with the turbines (without stator, etc.) in order to find as well as possible the best one; it would seem it’s the one with 7 or 9 blades; then second tests with the whole assembly (with stator).
- 3 blades: 600 g lower than specifications
- 5 blades: 850 g 1500 g with stator
- 7 blades: 1020 g Not Communicated
- 9 blades: 1050 g Not Communicated
- 11 blades: 980 g 1400 g with stator
In short, the parts are defined and rigid, have very positive matching , the rotors could remain in PA12.
The stator is manufactured in PA12 charged carbon fiber; considering the final surface quality obtained and rigidity, Windform XT could bear bearing stress.
The modifications to be done are thus not related to the manufacturing process in laser sintering nor to the materials but with continuous improvements with the test procedure, especially concerning the stator, the change of the angle of attach and the improvement of the fixing mode for the electric motor (some internal frictions and sparks without damage of the parts).
A greater rigidity of the stator will be necessary to make of it a structural part of a delta system wing because of a drone = passage to carbon fiber filled sintering.
