Saro is the abbreviation of the Saunders-Roe Lts brand, a manufacturer of airplanes or rather, seaplanes and amphibians.

“Saro 45 lbf”

-It manufactured and tested pulsejet engines to be mounted on helicopter blade tips. The first pulsejet was the one with 45 lbf of thrust (a little more than 20 Kgf) and with a diameter of 14 centimeters.

-The next pulsejet was the 120 lbf model that we see in the factory test tunnel.

“Saro, 120 lbf”

-It was 1952, when the next study was in collaboration with Napier. This was a rocket engine with outlets through the rotor blade tips of the “Skeeter” Mk6 helicopter.

-Same as Hiller's ROR system, as we will remember.

“Skeeter blade tip”

-The peroxide reserve was interchangeable in the field, very easily.

Around 1960, Saro (Saunders Roe) proposed a rocket engine system for the Black Prince at the proposal of the RAE. It should be able to launch a given orbit. Running on LOX/LH2.

“Saunders Roe Proposal”

-In the early 1950s, a researcher from the company itself, Tharrats, worked with the idea of valveless pulse jets. In theory, with the front covered, they were known as “Capped Tubes”.

“Tharrats pulse jet”

-They were made for use in small helicopters, as Saunders Roe was working with rotor tip pulsejets (ROR).

“Another example of a Capped Tube”

From Appendix 6: We located a schematic of the 45 lbf thrust pulsejet. It had flapper valves and the explosion frequency was 45 cycles per second.

-It had a diameter of 5.5 inches and a length of 47.5 inches, weighing 15.5 pounds. It was destined for installation on the rotor blade tips.

“45 lbf pulsejet”

-The other model, more powerful and for the same function, was the Saro 120 lbf.

“120 lbf pulsejet”

From Appendix 9: Here are two more engines designed and built by this brand. Later they would move on to Bristol (see).

-Gamma 201
-Gamma 301