The Camel's is a relative wind-driven generator, I'm fairly certain. No idea what it's powering, but it has the right look.
The Dr.I's anemometer driven ASI is calibrated in km/hr, if you look closely

[MF] Gunloon
Edited by Gunloon (11/01/09 11:29 AM)
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Love. You can know all the math in the 'Verse, but take a boat in the air you don't love, she'll shake you off just as sure as the turning of worlds. Love keeps her in the air when she oughtta fall down, tells ya she's hurtin' 'fore she keens. Makes her a home.
Captain Malcolm Reynolds, Serenity