Started by mman, December 05, 2013, 11:24:44 AM
Quote from: mman on December 05, 2013, 11:24:44 AM375CT,Since you are VB programmer could you possibly convert this McCoy's intlift2 to VBA language?http://www.jbmballistics.com/ballistics/downloads/downloads.shtml
Quote from: mman on December 06, 2013, 09:54:39 PMNo confusion, just thought you might be more familiar with different languages than me. Thanks for your effort in any case.
Quote from: 375CT on December 06, 2013, 10:11:17 PMDo you have McDrag already converted?
Quote from: mman on December 07, 2013, 06:45:37 PMQuote from: 375CT on December 06, 2013, 10:11:17 PMDo you have McDrag already converted?No..
Quote from: mman on December 08, 2013, 06:49:06 PMNo, I don't. McCoy is full of interesting things you could calculate (guestimate) if you just knew these 6-dof coefficients.. Intlift could be useful in that sense.EDIT:I red an old email exchange with brad (guy behind JBMballistics) and he said the following about intlift2:"I have converted it, but it's part of my online programs and I haven'tmade that source code available to the public."So I guess if you convert it you could compare the results with JBM's Modified Point Mass Trajectory calculator. I believe it actually uses McCoys code to calculate those 6-dof coefficients
Quote from: admin on December 08, 2013, 10:50:23 PMI did some work here.I have implemented the 6Dof flight-dynamics.I have looked at the intlift code, and I remember downloading Qbasic and trying it out.I implemented partly the official N a t o standard to estimate 6-dof coeficients. That document was very unclear. I wonder if the N a t o bullets fly. I salvaged some of the code that is at the base of P r o d a s, and the N a t o standards. It is a very poorly digitized public US document. Some of the code is unreadable, but I could do most of the restauration by reading the papers.Then I decided to port Intlif2, which is only a few hundred lines, and then time ran out.Currently i am a professor in computer science and have a PhD and a post doc in nuclear physics. Clearly, code conversion is a non issue, however I like to understand the physics behind it, e.g. the basics behind Intlift. That stops me from blindly implementing code. So I started to buy some books. Conclusion: the 6-dof parameters are calculated with phenomenological formulas. The only available sources to which the parametrisations are fitted are US data sources. Currently fluid dynamics is replacing the old methods.have a look here: http://openrocket.sourceforge.net/index.html