Special Features of Flights of The Bell Rocket Belt
The pack's pilot wears shielding overalls made of thermal resistant material, since the exhaust jet and the engine's pipes are very hot. The crash helmet (which has inside it the signal buzzer) is put on. The rocket thrust-chamber's supersonic exhaust jet makes a deafeningly loud sound (by force to 130 decibels), more like a shrill screech than the roar of an aeroplane's jet engine.
As a rule, the jet exhaust is transparent and not visible in air. But in cold weather the water vapor, which is a large part of the steam-gas mixture, condenses soon after it leaves the nozzle, and then a cloud of water fog enwraps the pilot (for this reason, the very first tethered flights of the Bell Rocket Belt were carried out in a hangar). The jet exhaust is also visible if the fuel is not decomposed completely in the gas generator, which occurs if the catalyst works poorly or the hydrogen peroxide is impure.
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