"P.507, 1953, Light two-seat reconnaissance helicopter to MOA Specification HR.144T.
Two blade rotor tip-driven by 2 Saunders-Roe 8 1/2 inch pulse-jets. 360° vision.
AUW 1500 lb"
That's the original text from Tagg/Wheeler "From Sea To Air", the original source of
3-view and artist's impression.