Here's a good article on Lunar Module stability, which is a similar problem with the exception that the Grasshopper has a much longer longitudinal axis, and rel

Here's a good article on Lunar Module stability, which is a similar problem with the exception that the Grasshopper has a much longer longitudinal axis, and relies solely on gimbaling (thrust vectoring) with no separate attitude control thrusters. http://www.clavius.org/techlmstab.html http://www.clavius.org/techlmstab.html