Author Topic: 6Dof bullet parameters  (Read 11293 times)

375CT

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Re: 6Dof bullet parameters
« Reply #15 on: December 11, 2013, 03:03:03 AM »
Please unpack. Perhaps only the exe is necessary?

Robert, thanks for the zip file.

You should get rid of those GOTO...or you won't pass any exam ;)

Mman, is this enough or you still need it refactored?

admin

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Re: 6Dof bullet parameters
« Reply #16 on: December 11, 2013, 09:27:27 AM »
goto's: the first port has to stay close to the source. Any upgrade can be compared to that.

mman

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Re: 6Dof bullet parameters
« Reply #17 on: December 11, 2013, 09:51:43 AM »
Thanks Robert! And that didn't take too long.

375CT,

Program is usable as it is. However for me VBA is the thing. Only with VBA code it is possible to implement intlift2 on excel spreadsheets and take full advantage of it.

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Re: 6Dof bullet parameters
« Reply #18 on: December 11, 2013, 07:51:28 PM »
Since you insist:
i will create a BfX_IL2, and put the 6dof code in another bfx.

can you find some of the publications mentioned in the code? So that we can understand what is going on?


mman

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Re: 6Dof bullet parameters
« Reply #19 on: December 11, 2013, 09:25:38 PM »
Since you insist:
i will create a BfX_IL2, and put the 6dof code in another bfx.

can you find some of the publications mentioned in the code? So that we can understand what is going on?

That would be nice! but what publications?

Do you mean this:

20:     REM THIS PROGRAM IS A MODIFIED VERSION OF M. A. MORRIS' RARDLIFT
30:     REM CODE, WITH CORRECTIONS FOR SMALL ARMS BULLETS AND MEDIUM
40:     REM CALIBER CANNON PROJECTILES.

Or is there something else mentioned somewhere?

« Last Edit: December 11, 2013, 09:28:03 PM by mman »

375CT

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Re: 6Dof bullet parameters
« Reply #20 on: December 12, 2013, 06:45:29 AM »
M.A. Morris wrote "A Computer program to Predict the Major Aerodynamic Coefficients of Conventional Shell and Bullet Body Shapes," RARDE Branch Memorandum 9/81, England 1981

RARDE stands for Royal Armament Research & Development Establishment

According to some sources, Bob McCoy wrote INTLIFT based on the work of Morris.

mman

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Re: 6Dof bullet parameters
« Reply #22 on: December 12, 2013, 10:42:04 AM »
Thx, i will have a look at that.

before creating the bfx functions I think I can help you a bit.

1) copy the output of the new program in Excel
2) use interpolation BfX_I

see attachment

mman

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Re: 6Dof bullet parameters
« Reply #23 on: December 12, 2013, 11:38:29 AM »
Okay how can I copy the output to excel?

For me copy output option doesn't do anything...
« Last Edit: December 12, 2013, 11:41:25 AM by mman »

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Re: 6Dof bullet parameters
« Reply #24 on: December 12, 2013, 01:29:36 PM »
just from screen. Right mousclick on window, select all ...

Next version will have the output to file option working

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Re: 6Dof bullet parameters
« Reply #25 on: December 12, 2013, 02:10:04 PM »
this version generates Intlift2.txt with ; for excel. The file is in the same directory as the .exe

mman

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Re: 6Dof bullet parameters
« Reply #26 on: December 12, 2013, 04:49:35 PM »
Now it works great!

When you create bfx functions I'll but them into use. I have some ideas what to with them.

What I'm going to do first is advanced stability calculator. I just need to include calculations for moment of inertias and CoG. I've done some work with this already. It's easy to use 3D-CADs to check if approximations are correct. It goes without saying, I'll share spreadsheets when they are finished.
« Last Edit: December 12, 2013, 04:56:44 PM by mman »

375CT

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Re: 6Dof bullet parameters
« Reply #27 on: December 12, 2013, 11:31:29 PM »
Off topic.

May I suggest a new thread with a new title? Since most of the last posts bear no relation to HIT PROB, most readers will not be able to follow this change in direction, and will make for a better follow up.

If Robert agrees on, perhaps he could move the last entries to the new thread.

mman

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Re: 6Dof bullet parameters
« Reply #28 on: December 14, 2013, 04:19:17 PM »
Robert,

What formula have you used to calculate mach number?

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Re: 6Dof bullet parameters
« Reply #29 on: December 14, 2013, 07:32:20 PM »
In intlift2 the machnumber is an input value. Not computed from anything
In bfx the speed of sound is taken to be constant, I have to look up its value?