Here some links but unfortunately not in English:
Fjordling - Wikipedia
Very short: originally designed for 40hp and 18-20 knots, but up to 300 hp installed..max 80 knots....
specification:
Fjordling 17
Manufactorer: Fjord Plast AS, Arendal, Norge
Designer: Jan-Herman Linge
Konstruktionsår: 1963?
LOA: 5.20 m
BEAM: 2.13 m
Deplacement: 380 kg
Prod. start: 1963
Prod. stop: 1969
all dets WOG