[rossfloyd Posts: 2047 Status: Offline]

   A pity this never made it to production - ideal for a Sev perhaps ?  Found in a 1950's aiviation mag ......
 [/font]R[/font] A high order of glossy enamel and bright-polished metal made[/font]the Nomad glisten and sparkle, too. But one was far more interested[/font]in finding which bit lead where and what such and such did[/font]and how that must do something else; an intriguing exercise.[/font]Differing in detail from the photographs of the unit published in[/font]our September 7th issue, the actual Nomad on the Napier stand at[/font]Farnborough was also equipped with co-axial Rotol airscrews;[/font]although the three blades of each of these were close-cropped, the[/font]hubs looked as if they might well suit the Saro Princess—as[/font]5 indeed,might the Nomad itself, and to some effective purpose. The power unit comprises a horizontally opposed 12-cylinderdiesel engine which, however, would have given Rudolf Dieselconsiderably to think for not only is it highly supercharged, it isalso a two-stroke and, what is more, it runs on paraffin. Crankshafttorque is given through a reduction gear to the rear airscrew.Exhaust gases are ducted from the 12 cylinders to one of a pair ofturbines which, from the appearance of the shrouding, look to betwo- and three-stage components. A pair of auxiliary combustionchambers serve to burn additional fuel to amplify maximumthrust for take-off and, to this end, feed the other turbine. Thefront airscrew derives its torque from the turbine shaft, albeitthrough a reduction gear. Supercharging of the engine—or, at least, the gas-generatingpiston-unit part of it—is achieved through the medium of twoentirely separate and quite different types of compressor. Firstthere is an axial-flow component which we believe to be adevelopment of that used on the Naiad, but which now operatesat an unusually high compression ratio. This unit is driven by oneof the turbines and delivers, without the interposition of an intercooler,into the eye of a centrifugal (second-stage) compressor,which is driven by the diesel half of the engine, and which deliversto the induction tract serving the cylinders. Thus, to sum up, the Nomad is a twin-supercharged dieseltwo-stroke which drives one airscrew, and has its exhaust gasesdelivered to a turbine for driving another airscrew, the airscrewsbeing co-axially mounted. Vital statistics so far publishable arethat the Nomad produces 3,000 e.s.h.p. plus 320 lb residualthrust; weighs 4,200 lb dry; has a fuel consumption at maximumcontinuous power (s.l. static) of 0.36 lb/e.s.h.p./hr; is 10ft 6|»
long, 4ft io|in wide and 4ft ijin deep.