On 30/08/14 22:08, Peter Fairbrother wrote:
On 30/08/14 15:52, Monroe L. King Jr. wrote:Bill Thanks for the feed back. I had already asked one manufacture about a comparable COTS motor for a Loki and the answer I received was a 5" motor. That throws everything off and cost a good deal more. Besides that I had also mentioned to this manufacture we wanted to recreate the Van Allen experiment on the 60th anniversary next July with a balloon launched Loki. (what's really funny is now these papers show up a week or so after I asked the same guy if he had any hard info on the Loki) Being I already have the balloon- I'm more interested in the standard 3" Loki Dart from an expense point of view. If I could just find some COTS propellant that burns that fast.
Sorry, I missed the balloon part - why do you want a super loki dart type for a balloon launch?
The point of the dart configuration is to minimise atmospheric drag near the ground, but you won't be flying there ...
-- Peter Fairbrother
So I guess I need to calculate the burn rate and see what COTS has to offer in that ball park. Who has the fastest COTS propellant? Has anyone got any hard data on that? I'm sure someone out there in Arocket land already know who's got the hottest propellant.The Cesaroni pro-75 (3") 6G reload sounds about right here - the white thunder propellant type, with 1.8 seconds burn time, should hot enough. The standard case will be too heavy though, and you will probably have to build your own case/body (though there are some alternative manufacturer cases already available). For further kicks you could put a pro24 or pro29 in the dart, with a long timer and perhaps a slower burning propellant. Sim it and see. The helical launcher is good if you need fairly close recovery (that's what it was designed for), but if you have a very large launch site it shouldn't be needed. -- Peter Fairbrother