When using hybrid motors, what must be considered in terms of fuel selection?

When selecting fuel for hybrid motors, it is essential to consider that the fuel must not be reactive with nitrous oxide. Hybrid rocket motors typically utilize a combination of a liquid oxidizer, often nitrous oxide, and a solid fuel. The key to effective performance and safety in hybrid propulsion systems is ensuring that the fuel chosen is chemically compatible with nitrous oxide, avoiding any unintentional reactions that could lead to combustion instability or destructive malfunctions.

If the fuel were reactive with nitrous oxide, it could lead to premature combustion or other undesirable reactions that jeopardize the rocket's performance and possibly pose safety hazards. Therefore, selecting a fuel that demonstrates stability and non-reactivity with nitrous oxide is crucial for the reliable and effective operation of hybrid motors. This consideration helps to ensure that the motor operates as intended, achieving the desired performance without compromising safety.