Minimum velocity off rod

[rass]

What is the minimum speed at which point the rocket will get stable?

 

[smstachwick]

That depends on your rocket’s design and the existing weather conditions. If your rocket has negative static stability in flight configuration, it will not be stable at any speed.

If you have positive static stability, the minimum speed for safe flight will be higher for smaller stability margins and faster winds.

Generally 30 mph is considered the target to aim for. A good stability margin is at least 1 caliber (equal to the body tube diameter). For example, In a 14mm diameter rocket, you should have your center of gravity at least 14mm forward of your calculated center of pressure, at liftoff and at separation/staging events (if any)

Tripoli guidelines specify a minimum 5:1 thrust-to-weight ratio, although RSOs can approve down to 3:1 if they judge that circumstances permit it.

If you’re ever in doubt about your rocket’s performance, run a simulation, ask somebody more experienced at the range, and set up farther from spectators than normal. Distance is safety.

(Minor edits)

 

[rass]

That depends on your rocket’s design and the existing weather conditions. If your rocket has negative static stability in flight configuration, it will not be stable at any speed.

If you have positive static stability, the minimum speed for safe flight will be higher for smaller stability margins and faster winds.

Generally 30 mph is considered the target to aim for. A good stability margin is at least 1 caliber (equal to the body tube diameter). For example, In a 14mm diameter rocket, you should have your center of gravity at least 14mm forward of your calculated center of pressure, at liftoff and at separation/staging events (if any)

Tripoli guidelines specify a minimum 5:1 thrust-to-weight ratio, although RSOs can approve down to 3:1 if they judge that circumstances permit it.

If you’re ever in doubt about your rocket’s performance, run a simulation, ask somebody more experienced at the range, and set farther from spectators than normal. Distance is safety.

Thanks!

 

[OverTheTop]

I use 50-60fps as a good minimum starting point. 40fps can work, depending on the rocket and motor, if the wind is quite calm.

The detail answer starts with "It depends...".

 

[lakeroadster]

I also use >30 mph as the goal...