The increasing performance of combat aircraft in the postwar years saw aircrews subjected to greater and greater acceleration or g forces during manoeuvres. Reducing the distance that blood has to pump from the heart to the brain increases tolerance to g. Lying prone would theoretically give the pilot an edge in a dogfight. To test this concept for a proposed British rocket interceptor, a Meteor F.8 fighter was modified with an additional cockpit in a forward fuselage extended by 2.39m. A safety pilot remained in the notmal cockpit. Tests showed the prone pilot could indeed endure slightly more g, but suffered from vertigo, couldn't see very much — particularly behind him — and became tired quickly. After 55 hours of flight testing the idea was abandoned.