I have never understood the fascination with the one wheel in front / two in back configuration, because two in front eliminates the differential drive issue and provides far better stability and potentially superior braking.
Of course, it's pretty easy to adapt a 2-wheel frame design to one front / two rear, so that explains much the push.
I have mentioned this before on BF, but I am one of those folks who cannot get the hang of making a turn on a trike, because the whole lean-to-turn instinct is far too deeply ingrained within me. (Yes, I know you just turn the handlebar or tiller, but forcing yourself to do so without first leaning is completely alien.)
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"Far and away the best prize that life offers is the chance to work hard at work worth doing." --Theodore Roosevelt
Capo: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger (2), S/N 42624, 42597
Carlton: 1962 Franco Suisse, S/N K7911
Peugeot: 1970 UO-8, S/N 0010468
Bianchi: 1982 Campione d'Italia, S/N 1.M9914
Schwinn: 1988 Project KOM-10, S/N F804069