Re: 3D printed rocket contest at MRRF!
Posted: Sun Jan 10, 2016 6:33 pm
I never knew that the "beyond hobbyist" market would have rockets that sophisticated. I'm almost 64 but I still learn something new each day!
Have a look around and join now!
Sheaffer wrote:I generally get them back. Especially the big ones like this - they are a pretty big "investment" both dollars-wise and time-wise. Either GPS or other tracking methods help a lot.
I actually got this particular rocket back one time 3 miles from the launch site after the main chute deployed at apogee (it's not supposed to).
Big rockets like this use a dual deployment system. An altimeter senses when the rocket reaches zero acceleration (apogee at the top of the ascent) and then fires a charge that separates the rocket and deploys a small parachute. The rocket then drops quickly, but under control, to a pre-set altitude. Then a second charge is fired and the main chute(s) are deployed, slowing the rocket so that it is not damaged when it lands (theoretically). The idea is that while the rocket is dropping quickly, it has less chance to drift too far from the launch site.