70mm engine starting cartridge

[whiterabbit]

does anyone have any idea as to what engine used a 70mm dia 180mm high brass cartridge with a 5mm rim and British broad arrow mark. The base marks are :

cart elec eng start rlb 74/ 8

076 gd 74

Theres a slight roll turnover to the rim which I assume held in an over powder wad. Also would the wad have been celluloid (nitrocellulose) or similar in order for it not to foul the cylinder of the engine. I remember looking at a few of the original Marshall tractor starting cartridges some years ago and they contained a black square grained powder which when I think about it was very similar to ballistite, often wondered was it war surplus!

Thanks,

Paul

 

[TimG]

In the absence of images, from the dimensions given, it would appear to be a No. 9 or 10, Engine Starter Cartridge.

The No. 9 Cartridge was for use in the Rolls Royce turbo-starter Type SBS 720 Mk 1. (single chamber) as fitted to Avon 1 engines in the Canberra 1, 2, 3 & 4 (possibly others).

The only real difference between the No. 9 and 10 cartridges is the electric primer used - No 43 on th No. 9 and No. 48 on the No. 10. Both used 700 grammes of Cordite. However, there are dire warnings about using the No. 10 in lieu of the No. 9 as the former was considered to be a more powerful cartridge.

TimG