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Reloading 37mm Rounds Aerial Signal FlareYou will create the flare compound using one of the star mixtures listed above. Using a glue such as Elmers©, make a ring around the end of your (paper) casings about 1/4" to 3/8" from the end of the casing. Push a paper plug down into the casing until it is flush with the end of the casing, and allow the glue to dry. Moisten your flare compound using denatured alcohol until it is the consistancy of cookie dough, and press the mixture into the casing using a wooden or aluminum dowel until it is approximately 70% full.While the mixture is still moist, (using a nail), create a cavity in the mixture about 1/2" deep. Allow it to completely dry (usually 8 to 10 hours). Fill the cavity with prime comp (see below) which has been moistened into a cake-like batter, and allow it to completely dry. Once dry, add a layer of epoxy to the casing. DO NOT cover the prime comp with the epoxy or the round will fail. Once again, allow the whole lot to dry. Once dry, add a level teaspoon of ffg black powder to the remaining space in the casing (it will cover the prime comp and the epoxy). Glue a disk of typing paper over the end of the casing and apply a layer of Elmers glue to the outside of the paper. Place the completed casing into your primed 37mm shell breech end first. If it is too loose in the shell, you can wrap a layer of masking tape around the casing.
Prime CompositionThis is the substance that you use on the bottom end of the fuse which extends into the lift chamber...the lift powder catches the primer comp on fire, which lites the fuse, which lights the flare/smoke/bang charge.
% by weight
Potassium nitrate 45.0
Potassium perchlorate 25.0
Red Iron Oxide 5.0
Silicon 15.0
Red Rum or Shellac 8.0
Charcoal, Air float 2.0
Nitrocellulose Lacquer to batter-like slurry
*Magnesium - 100m or finer 10-15% additional
The prime comp is made by mixing the above ingrediants in exactly the percentages listed. The easiest method of calculating them is to create exactly 100 grams of prime comp, which allows you to us the above percentages as gram measurements, i.e. you would use 45 grams of Potassium nitrate, 25 grams of Potassium percholorate, etc. If you find that the prime comp is not igniting correctly when the lift charge ignites, you may want to add very fine black powder to the mixture. You would add it in ratios of 70% prime comp to 30% black powder. Again, you would use denatured alcohol (or NC lacquer) to moisten the mixture.
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| This site contains information about legal flares, smoke generators and reloads. The information in these web pages is not intended to be used to construct illegal devices, nor is it intended to be viewed by minors. This site is devoted to the fostering and broadening of knowledge within the 37mm community for the safe and legal use of the 37mm flare launcher. All Contents Copyright© 1999-2006 37mm.com |
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