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#1
28-09-09, 08:13
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Excellent, that is what I am looking for, I might just do up one of the trap door mortar tubes for public displays etc, drop down the round with a 12 ga charge, big puff of smoke and pull the round out the bottom...I picked up 3 complete 19 sets for tank installation with all goodies so I have some spare stuff, also my 22 set is in and I worked on it the last time I was home on leave. I also picked up a complete ranging set with base which will be coming over in the container, same base as the 22 set to mount it in a vehicle, so I can install it in my A/B jeep. I also picked up an original wooden battery box for 10 volt that I will have to get you some pics of, looks like same dimensions as the 6 volt, plus 2 metal battery carriers 50's dated with original 6 volt batteries, so more pics there..OK patiently awaiting the mortar stuff....
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39 Austin 8 Tourer 42 Humber Heavy Utility 42 C15A Wireless Truck 43 Humber AC MK IV F133744 "Vandal" tri-owner 43 A27L Centaur MK III T185481 
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#2
28-09-09, 18:45
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Attached are two shots showing original and my homemade versions of firing pins/studs. I'm not sure what the British equivalent thread size is but both mortar balls that I have would accept a 5/8" coarse thread bolt. The original firing stud was 7/8" diameter so I used that for my homemade firing pins. The other shot has my original 3” firing stud along with two wartime demilled launching cartridges. One has the self contained firing pin in place and the other shows it in parts for comparison. Not something I could readily reproduce which is why I went back to a more traditional weapon firing pin using simple standard primed cartridges.
Material I used is 7/8" diameter stainless steel. The 3" firing pin is 3.25" long and the 4.2" firing pin is 4.5" long. Each of these measurements includes the 5/8" threaded section. To make the pin itself, drill a hole in the center of the face and tap in a short length of 3/32" round stock spring steel or you can use the shaft from a drill bit of the same diameter. So far I haven't had a failure on any of my self loaded launching cartridges that I've test fired. I'm using 12-gauge hulls which I use a roll crimper to seal after filling. Powder is two F (FFG) Triple Seven by Hodgdon which is a clean modern black powder substitute. It burns dirty and greasy like black powder but cleans up easily with water. This is the same powder I've been using with my 2" mortar. I've tried several types of smokeless powder that burned really clean but they don't produce a satisfactory amount of lift for the volume of powder. Probably 1/6th the range at best compared with an equivalent load of 777 powder. For augmenting cartridges, I planned to fill paper quarter rolls with powder and rubber band them to the fins which is similar to the wartime method where they used celluloid tubes held in place by springs. But while experimenting, I found you can simply pour the added powder charge down the barrel and it cooks off perfectly when the normal launching cartridge hits the firing pin and sets of the main charge.
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David Gordon - MVPA # 15292 '41 Willys MB British Airborne Jeep '42 Excelsior Welbike Mark I '43 BSA Folding Military Bicycle '44 Orme-Evans Airborne Trailer No. 1 Mk. II '44 Airborne 100-Gallon Water Bowser Trailer '44 Jowett Cars 4.2-Inch Towed Mortar '44 Daimler Scout Car Mark II '45 Studebaker M29C Weasel
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#3
11-10-09, 16:17
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4.2 inch mounting for trade
Last week I've bought another 4.2 inch mortar mounting from someone who offered it to me because he knew that I'm working on a restauration of this mortar. But now I want to trade it to other parts of the mortar such as the tube or the baseplate.
The mounting is fabricated by JCL and is dated 1942. It also has the broad arrow and all parts are functional. Please let me know if you are interested http://brechtsoorlogsmuseum.freeforu...-inch-t12.html
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