Noobie here with a question. I'm just thinking ahead and want to learn more about this. Do fliers often not use a drogue when using a GPS? Would it make sense not to if the rocket is going to around 20,000 ft. or less?
I was wondering becuase rocksim says that a rocket going to 15,000 ft. W/O DD then falling at 22 fps in 14mph winds will land 1.7 mi from the launch site. That doesn't seem too bad, and if launching under more calm conditions, I don't see the need for DD.
$1000.00 is a lot of money to spend on something that probably won't give you an accurate estimate unless you feed it winds aloft data. This thread seems to be about "back of the envelope."but its not as accurate. Hes saying get RS PRO and see what it has to say.
TimNoobie here with a question. I'm just thinking ahead and want to learn more about this. Do fliers often not use a drogue when using a GPS? Would it make sense not to if the rocket is going to around 20,000 ft. or less?
Agreed! Especially the wind direction bit -- we've had ground winds coming from the exact opposite direction of upper level winds.The recommended descent rate under a main parachute is ~15 fps. A 10 mph wind will move your rocket sideways ~15 fps. If you reached 20 kft and popped a main under such conditions, you could have a 4 mile recovery trek, and that might be conservative since the upper level winds are usually stronger and may well come from a totally different direction than at ground level. Splitting the rocket or deploying a drogue at apogee and deploying a main at 300' will likely reduce the walk by a factor of 4.
L2 rockets can hit 20K AGL and higher; most do not, but it can (and does) happen.To launch a rocket that gets to 20,000 you need to be L3 high power certified, and during the certification process you will need to learn all about this sort of stuff.
That, right there, in my opinion is the best advice anyone can get, or give. Local, experienced people can teach you a LOT more than a book.
JD, what did you mean at 20k you might have trouble popping the chute? Is that the point where air pressure starts becoming an issue?I was using RS Pro as an example that RS is just scratching the surface when you try to figure out landing zone guesstimates & you really need more data.
Also at 20k you might have trouble by "just popping the chute" by any means.
There's also the question of who owns the neighbouring properties, and how amenable they are to having rockets fall on their lands. Some people will be okay with it, while others are not so accepting.I think there are two main questions to ask when deciding to use dual deploy:
How far do you want to walk to retrieve a rocket? If 1.7 or more miles is an acceptable walk for you. That much of a walk for me and I would be like :hot:
How much range area do you have for retrieval? In the desert or farmland you probably have miles of space, but some places may have retrieval space limits.