WHISTLING PROPELLANT #2
SOURCE: John Steinberg
COMMENTS: Whistle rockets must be made in the same way as a standard firework whistle, in the sense that it must be pressed very firmly for it to produce a whistling effect. The catalyst can be any metal oxide, though the usual ones used are titanium dioxide, copper oxychloride, and red iron oxide.
DANGER/CAUTION
Whistle compositions should NEVER be rammed. They must be pressed, or an explosion may result.
PREPARATION (parts by weight):
| CHEMICAL | PERCENT/PARTS | AMOUNT |
| Potassium perchlorate | 0.730 | |
| Potassium benzoate OR sodium benzoate | 0.260 | |
| Catalyst | +1 | |
| Petroleum jelly | +2.5% | |
Total | ||
NOTE: +2.5% is 0.025 x batch weight
(For example: 0.025 x 200 g = 5)
