Hi All,
The first model boat to cross the English Channel was Miss Ee Dee (From Electronic Developments Co, an early model R/C british company who also did the 4. 1/2 cc diesel engine that powered it.)
The crossing took place on 6th September 1951 and they landed at Calais. The boat was plywood and hardwood, 5 feet long by 2 feet beam, with a single channel Regen valve radio operating a motor driven rudder. As far as I know the two tinplate fuel tanks in the boat did not need refilling!!
I'm not sure how long it took them though.
Mental!!!......There's an original newsreel film clip on YouTube somewhere.
Cheers..........Ron Rees.