Having insufficient power for its operation.
1925, (w), New York: Grosset & Dunlap, Chapter 2,https://fadedpage.com/books/201410K7/html.php
- (..) occasionally a flap-skitter duck, making up his mind to go a-visiting, gave himself over to the serious business of flight. ''Flap-flap-flap, skitter, skitter, skitter,'' went he, taxi-ing along like an underpowered airplane, leaving behind him incredible churnings of wake.
1945, (w), New York: William Morrow & Co., Chapter 4, p. 111,http://www.fadedpage.com/books/20121105/html.php
- The old under-powered van ground its way very noisily and rather slowly up the long steep hill out of the town.