H-19's were also called "Ricochet's"....as they sometimes resembled same as they skipped along the surface trying to get airborne....over powered they were not!
Running takeoffs...a common practice borne of necessity....could become great fun when the Nose Gear(s) took up a bad case of Shimmy....which killed off the acceleration and left you in a positionn where the runway got shorter and your speed and height stayed constan.