Rich it can sound nice. Even one of those clips I put on youtube doesn't sound too bad running just of the first 3 cylinders!
On another forum someone asked my what a FV1622 actually was.
It may outwardly look like a normal GS but it is a
Power Supply, Electrical & Pneumatic, Truck Mounted, Malkara, 1 Ton, Humber FV1622
It went into service in Jan 1963 with the Missile Test Troop, Cyclops Sqn 2 RTR. Here is that very same vehicle at Kandahar Barracks at about that time. I have just sent the clip to the Missile Test troop Sgt who used this very vehicle.
It has a governed engine & its most obvious feature was a compressor to run up the gyros when testing the Malkara ATGW centre bodies that were accommodated in the
Test Equipment, Guided Missile, Trailer Mounted, Malkara, 1/2 Ton, 2W, Sankey FV2308R which was towed behind it.
I was told by the EME that the bottom line was in the event of a catastrophe with a Hornet engine then the FV1622 would have to be a donor.