A small monopropellant

liquid hydrazine rocket

engine is designed to

produce thrust of $25$ N and

Isp of $198,$ which is to be

operated for $5$ h$.$ Two layers

of alumina granules are used

for the catalyst bed with

blade loading BL of $3\mathrm{.}75$

g$/$cm$2$ s$.$ Determine

diameter of catalyst bed

and amount of hydrazine

required for this operation.