The fact that only 23 or 24 were made suggests one per aircraft, which is rather a low number in (S)service,civil or mil.Which might suggest,Bevelgear,Britannia,Basset;however,since there was no direct access to the cockpit from the cabin in a Bevelgear,due to the engine/transmission,only a very narrow gap behind the co-pilot,it was probably designed as the `BLOCCTIMS`(Belvedere loss of cabin communication telescopic information management system ) which usually had chinagraph messages on a piece of perspex ,information such as` `SIDDOWN``SHUDDUP`,STANDBY`GETTOUT-NOW !`HOW MANY ?? TOO MANY-DROP2/3/4!!all accompanied by a blaring `klaxon,,and flashing of the para lights!!
Cornish Jack-My namesake,a marvellous machine,real engine,wooden blades,manual controls,big trim wheels,C of G compensator, 2-stage amber and blue goggles,and ground resonance- helo pilots these days don`t know they`re born !!! SYC