Надо полагать, речь идёт об этих
http://www.vectorsite.net/twbomb5.html
The British developed their own unguided airborne "rocket projectile (RP)". This was a simple weapon with fixed cruciform tailfins and a tubular body 7.62 centimeters (3 inches) in diameter. The RP was originally developed for barrage anti-aircraft fire in the desperate days of 1940:41, but after the threat of invasion receded, the large stocks available were adapted for use by attack aircraft.
The RP could be fitted with an 11 kilogram (25 pound) solid armor-piercing head, or a bulbous 12.5 centimeter (5 inch) high explosive warhead. The high-explosive version was also known as the "60 pounder" (27 kilogram) RP for the warhead weight. These rockets were used to arm the Hawker Hurricane, Hawker Typhoon, Bristol Beaufighter, de Havilland Mosquito, and other aircraft.
The relatively cluttered launch rails used by the RP usually reduced the speed of the carrier aircraft by a good fraction, but the rockets were effective enough to make the reduction in performance worthwhile. The Typhoon so was devastating in attacks on German armor with the 60-pounder that it became known as "Rockoon".
