That Valgerda design may well have been inspired by the boats from around the Hardanger fjord. The profile is very similar, with those characteristic, lengthened stems sticking out. However, this is probably a slightly simplified design. The originals had more subtle lines in the lower plank: The builder often started with a thick piece of timber and then carved out the lowest plank to get sufficient twist. Steaming was not used. These 4-oar boats generally varied between 14 and 17’, so Valgerda is approaching the seksæring (6-oar) size.
A færing would generally be rowed to windward and only sailed in winds below a close reach. Their narrow wl. beam made them initially tender, but easy rowers. The Valgerda, built of ¼” plywood would have been terribly light and tender without that ballast. She would of course have worked fine with a JR, as most boats do.
Arne