The advertising pictures of this product make it look very good indeed.
The ‘ blast’ is representative of a napalm strike and the fibre optics are a clever touch.
For a more conventional munition explosion the debris and combustion would normally be more vertical than horizontal.
Pre smokeless powder explosions are very reminiscent of the ‘ banger’ fireworks as they are essentially the same principle and constituents.
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For a more modern bang I use fine lengths of plastic sprue in a triangular clump with heated teased cotton wool sprinkled with debris.
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Happy modelling.
Chris