Sunday, 28 September 2008
We've yet to produce any serious ballistics calculations - suffice to say this is a CONSIDERABLE improvement on Spud 1. Projectiles of choice today were apples, very seasonal, home grown, environmentally sound and in plentiful supply. Still using the John Freida hairspray for fuel as it has consistently come top in all our performance tests - reliability is a key issue here. In the Spud 2 the ignition is provided by a Bosch Super4 R6-771 spark plug from the Merc, excited by the good old piezo unit from a gas boiler.
Bore is up to 2.25 inches, the muzzle length 5'6" and the combustion chamber is 3' of 4" land drain c/w fittings. The pic of the two weapons leaning on the back of the truck clearly demonstrates the increase in size. Obviously report is up massively and we've had to cut short trials to avoid trouble in Diploville. We need to find a reliable method of measuring the velocity - at the moment, in a steep launch, the projectile is out of site in a fraction of a second and I reckon we're dropping rounds at about 600yds. We haven't been able to conduct horizontal tests as this afternoon's session was cut short, but I reckon we'll be getting a minimum of 100 yards flat trajectory. I can't emphasise enough how good this is. MORE BANG !