≡ Menu

Cannon Systems – Big Gun

Strike Models is now taking pre-orders for 2 and 3 barrel rotating cannons systems.

  • Taking pre-orders through Dec 31st for delivery in February.
  • 2 and 3 barrel 1/4″ versions will be made with 2.75 to 6″ diameter magazines.
  • 2 and 3 barrel 7/32″ versions may be available shortly if they clear testing (Now cleared and added).
  • Default barrel spacing is 5/8″, but some variation is possible. Contact us to make sure that your request can be accommodated.
  • Pre-order needed because we need tooling and need to know how much material to get.

Description2.75 inch magazine3.25 inch magazine3.5 inch magazine4.0 inch magazine5.0 inch magazine6.0 inch magazine
1 Barrel (not available yet)
2 Barrels (1/4" round)$245.00 $245.00 $245.00 $245.00 $255.00 $265.00
3 Barrels (1/4" round)$250.00 $250.00 $250.00 $250.00 $260.00 $270.00
4 Barrels (not available yet)
2 Barrels (7/32" round)$245.00 $245.00 $245.00 $245.00 $255.00 $265.00
3 Barrels (7/32" round)$250.00 $250.00 $250.00 $250.00 $260.00 $270.00
2 Barrels (3/16" round)$245.00 $245.00 $245.00 $245.00 $255.00 $265.00
3 Barrels (3/16" round)$250.00 $250.00 $250.00 $250.00 $260.00 $270.00

Prices include the valve necessary to fire the cannon.

We have every expectation of shipping them in February 2017 shortly after our January shutdown. The design is a negative pressure type using an aluminum accumulator. This accumulator is 5.5 inches long and 1.25 inches tall. The top of the magazine is a little under 3 inches above the base of the accumulator. Here is a drawing that can be used for a fit check:

drawing_small

Click for larger picture.

The test cannon pictured below has almost all of the updated features that will go into the new version, but not all of the parts were finished so as to get to testing faster (like the final version will not have a square plate under the magazine and the lid of the magazine will be secured). The features that are not on that cannon are ones that we have built before in earlier prototypes, so we are not expecting problems incorporating them. The unloaded assembly below weighed in at 1.9 lbs. The final version will be close to this weight.

bgc_profile

Click for larger picture.

We know that there are additional versions that are desired in this hobby, and that these will not fit in every ship. Our thought was to get these highly desired versions out for the ships that can use them and finish the other versions at a later date. The big gun community has been without a reliable source of cannons for far too long, as these cannons have proved tricky to safely and economically produce. Part of the reason that BDE stopped making cannons was that their part price tripled for many of the components. Earlier in 2016, Strike Models purchased an older, large CNC machine on which we will be producing the parts.

The reason for the pre-order is that we need to find out how sets are needed for these sizes, plus tooling will need to be purchased for a production run. There are also a couple of parts with a longer lead time when needed in more that single quantity. During the January shutdown, a small amount of maintenance needs to be done on the CNC machine and chip guards added (machining out the accumulators throws aluminum chips EVERYWHERE).

Safety has been a driving factor in both the design and setbacks in getting these cannons into production. As someone who has personally had a set of PVC big gun cannons perform a rapid unscheduled disassembly with my face about a foot from the starting point, I can assure you that I do not want that to happen to anyone else. In that case it was a PVC glue failure in the accumulator. Another cannon merely launched the magazine when it was being tested at the water’s edge (and I was again right next to it). Both of these instances occurred long before I started designing cannons myself, but they definitely had an impact on the future designs. For starters, the accumulator is designed to be in a safe stress state (known as the yield stress) at more than double the the pressure at which the tubing leading up to it will burst. High pressure testing will also be done before shipping.

The entire cannon can be quickly disassembled, but it is recommended that the bearing not be unless you really need to. The bearing consists of contained delrin balls held between the base of the magazine and the accumulator. Here is a breakdown of the cannon:

Click for larger picture

Click for larger picture

There has been some concern about this being a form of a negative pressure cannon and being able to make it safe. By separating the main fill and the actuator exhaust, draining the system does not cause it to fire because the accumulator and actuator can be kept at equal pressure.

 

Strike Models is selling John C White’s Weapons Manual #1 and his plans for a Rotating Gun System. After going over the plans, we do recommend making some changes to both versions, which is why they are not immediately available for purchase. Please email us for details. Issues with both have to do with using glued PVC pipe connections.

PublicationDescriptionSheetsPricePart #Buy
JC White's Rotating Gun SystemThese are full scale drawings and instructions for making rotating cannons for 1/4", 7/32", 3/16", and 0.177". 4$30JC-RGSPlease email info@strikemodels.com
Weapons Manual #1JC White's instruction booklet for making reloading torpedo guns and bending barrels.Booklet$30JC-WM1Please email info@strikemodels.com