tested as the fastest motorcycle on the market at the time of its launch.<ref>{{cite web |title=MCM Dunstall advertising Paul Dunstall Powerful Dominator |url=https://www.gracesguide.co.uk/File:Im196702MM-Dunstall2.jpg |website=Grace's guide to British Industry |access-date=1 March 2013 |language=en |date=22 April 2011}}</ref> The early 1960s Norton factory racers were called Domiracer, and although Dunstall called his roadsters both Dominator and Domiracer at various stages and with varying engine capacities, the 750s were sometimes known as Dunstall Atlas. They were not known as 'Norton Dunstall' - this is a later corruption as all 1960s literature quote Dunstall Norton Dominator, Dunstall Dominator or Dunstall 750 Atlas. The last bikes from the featherbed-based machines in the 1969 catalogue were stated as Dunstall Norton Sprint and Export 750 together with the newest bike in the range the isolastic-framed Dunstall Norton Commando. After the 1968 race season successes, development of the late-1940s designed parallel-twin engine was nearing its zenith for the technology of the time with power outputs of 73 horsepower for the race-spec 745cc Atlas-based engine. For the 1969 season, Dunstall created a new machine with a lower frontal area, the inclined engine being 'underslung' from a large-diameter steel tubing spine frame (nicknamed The Drainpipe) designed by Eddie Robinson. The mainframe component ran front to back with a second large-diameter vertical tube at the rear of the power plant carrying the engine oil, avoiding the need for the traditional separate oil tank. The filler was conventionally placed ahead of the seat nose Although Dunstall's open-class racers (non-production-race category) were equipped with lowboy frames based on the design of the work which Dunstall had acquired during the Norton factory race-shop closure, this re-design was based on an established concept not yet applied to the Norton twin for road racing. With no front downtube(s) hence no conventional engine mountings, the spine frame needed substantial cantilever bracing from the central-point of the frame forwards under the gearbox and engine to control the torque reaction The original 'drainpipe' configuration included aluminium dual 'pannier' fuel tanks inside the top-half fairing sides to lower the centre of gravity and improve handling but following fuel starvation problems a conventional fuel tank was fitted. With the discontinuation of the featherbed Atlas in 1968, Dunstall first offered his Commando-based roadsters from the 1969 catalogue. In their test of a 1971 Norton Dunstall 810, Cycle World measured the top speed at , with a 0 to 60 mph time of 4.7