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Daniel Johnston Aerospace engineering — guidance, navigation and control

Guidance,navigationand control.

I design control systems and then measure them — a genetic algorithm that tunes flight-control gains and reports what its own settings cost, and a UAV sized and generated from a parametric twin.

Final-year aerospace engineering at RMIT, heading for guided weapons and flight systems R&D. Everything below is my own work, and every number on this site says where it came from — weighed, computed or simulated — and what it was measured against.

A plan-view drawing of the VTX-1 Pathfinder, nose up, generated from its parametric twin: a straight, constant-chord wing spanning the full width, with ailerons along its outer panels; two motors and propeller discs just ahead of the leading edge; the camera, video transmitter and flight controller on the centre line ahead of the wing; the two batteries, dashed, under the wing, with the centre of gravity marked between them; and a carbon boom running back to the V-tail.
1500 mm span — Clark Y, AR 8.0
VTX-1 Pathfinder in plan view, drawn by script from its parametric twin. The marked point is the centre of gravity the twin solved for, over the batteries.
GA spread across seeds, tighter
26 ×

Meta-tuned preset against the best hand-written one: IQR 3.4e-5 against 8.9e-4, 5 seeds, equal 5 000-evaluation budget

GA escaped the decoys to the true well
28/50 seeds

The escape preset on a 2-D decoy map, against 10 / 50 for standard

UAV all-up weight
1368 g

Against a hard 1500 g cap, from 13 of 13 physically measured components

UAV endurance at cruise
34.7 min

Computed on measured masses and a modelled drag polar

Measured against limits

Each bar is the band a figure had to land inside, and the mark is where it landed.

MasterGA
Evaluations spent, tightest preset 1802 evals
0 5500 evals

Every preset had the same 5 000-evaluation cap; this one stopped at its own generation limit on every seed, 36 % of what thorough spent.

VTX-1 Pathfinder
All-up weight 1368 g
0 1600 g

132 g of margin against a hard cap, on physically measured masses.

VTX-1 Pathfinder
Centre of gravity 33.00 % MAC
25 50 % MAC

The window was re-cut once the neutral point was found at 47.5 % MAC; the original 25 to 30 % target was arithmetically incompatible with the static margin it was meant to deliver.

Work

Two pieces, each taken far enough to produce numbers: MasterGA, a genetic algorithm for flight-control gain tuning that measures its own settings, and VTX-1, a UAV sized and generated from a parametric twin, now in build.

Get in touch

I am looking for graduate and intern work in guidance, navigation and control, flight systems, or uncrewed aircraft.

Get in touch