Hand-wound motors

[SPA240WS]

Some armatures I did years ago for some straightaway and racing. Soldered with hightemperature lead (300°C+). Balanced statically via razorblades, dynamical with a structure made from piano wire, bearings and a hand drill.
Afterwards epoxied the winding and armed/trued the comm.
To maximize the copper "filling" and estimate the wire-diameter I calculated with roughly 12mm2 in
sum per winding "package" .
Example: (0,63/2)2×3,1415×18×2 = 11,22mm²

[SPA240WS]

For comparism: rewound and soldered an old (burned) Tamiya Technigold (same wirediameter (.80)
and also 21 turns) and measured it with my two others: about 1.5K more revolutions under load and
slightly more max. output.