Re: Motorizing a Madsen
One possibility--get another pair of (steel) forks, spread them wide enough to accept a rear hub, then put a rear 26" wheel in and do a front-wheel-drive setup. {make a engine-mount bracket so the normally-rear-mounted engine rides above the front wheel, in front of the head tube}
With a cargo-bike setup you would probably want to get the engine gearing way down lower than usual.
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