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Home / Newsdesk / Rogers Aeroscience seeking LDRS Mach Madness fliers
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Rogers Aeroscience seeking LDRS Mach Madness fliers |
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News Release by Rogers Aeroscience
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Thursday, July 10, 2008 |
 WORLD WIDE WEB — Rogers Aeroscience is looking for rocketeers who will be competing in the Tripoli Mach Challenge contest at LDRS who would be interested in running the RASAero aerodynamic prediction and flight simulation software to design their rockets, predict their performance, and provide us with flight data from their max Mach attempts from the contest. A Beta test version of the RASAero software will be provided, and additional technical support at your request, to help you increase your rocket max Mach number for the contest.
The RASAero software features very accurate transonic, supersonic, and hypersonic drag coefficient predictions based on the geometry of the rocket body and fins. Design trades such as trading increased nose cone L/D (for lower wave drag) with increased nose cone weight, supersonic stability for minimizing fin size, fin sweep trades based on fin wave drag and fin supersonic CNalpha; can all be accomplished using RASAero's aerodynamic prediction and flight simulation capabilities. The RASAero fin airfoil selection includes eight different airfoils, five of which are optimized for supersonic (and hypersonic) Mach numbers.
If you're interested respond to
This email address is being protected from spam bots, you need Javascript enabled to view it
. Our only requests are for accurate geometry data for your rocket, an accurate pre-launch weight, and access to your flight data.
07-11-2008 03:12 AM
#1
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Rana sapiens
Joined: Aug 2007
Posts: 2937
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Re: Rogers Aeroscience seeking LDRS Mach Madness fliers
Most excellent. It will be very interesting to see what kind of agreement the new software will have at these wild and woolly speeds. What many of us are using is good, even very good up to mach, but the data and methodology is what about 50 years old? High time for a face lift.
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07-11-2008 07:11 AM
#2
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Certified Level Three
Joined: Jul 2008
Posts: 266
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Re: Rogers Aeroscience seeking LDRS Mach Madness fliers
Yea!
I'm still using Alt4, and the rest of the Rogers Aeroscience package.
I had emailed Chuck about rumors of an update to a Windows based program a couple of years ago.
Any idea when this will be released, and how much it will cost?
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07-13-2008 05:56 AM
#3
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Certified Level Three
Joined: Aug 2006
Posts: 114
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Re: Rogers Aeroscience seeking LDRS Mach Madness fliers
Quote: Yea!
I'm still using Alt4, and the rest of the Rogers Aeroscience package.
I had emailed Chuck about rumors of an update to a Windows based program a couple of years ago.
Any idea when this will be released, and how much it will cost? Not sure if this answers your question but when I contacted Chuck he sent me a beta version of his software and it loaded right onto a HP DV9500T laptop with 4 gig of memory and running a 64 bit version of Windows Vista Ultimate.
Andrew |
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07-16-2008 09:54 AM
#4
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If pigs had fins...
Joined: Sep 2007
Posts: 3155
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Re: Rogers Aeroscience seeking LDRS Mach Madness fliers
I'm using this beta and I cannot find a way to model multi-stage rockets - I may be overlooking something. It is my understanding that a lot of the rockets for Mach Madness are staged. Is there a trick to making this software model a multistage rocket?
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07-16-2008 10:36 AM
#5
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Freeform rockets advocate
Joined: Aug 2006
Posts: 1226
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Re: Rogers Aeroscience seeking LDRS Mach Madness fliers
Quote: I'm using this beta and I cannot find a way to model multi-stage rockets - I may be overlooking something. It is my understanding that a lot of the rockets for Mach Madness are staged. Is there a trick to making this software model a multistage rocket?
Use the "Jerry" option?
8 print "DO YOU WISH TO RUN ALT2 (SINGLE/BOOSTER STAGE) VERSION "
9 input "OR JERRY (UPPER STAGE) VERSION? (ALT2=1 JERRY=2) ";rrr
At least this was the code from ALT 2 and ALT3. Not sure about ALT4 because despite my several "licenses" I have not been given a copy of ALT4 by "Rogers Aeroscience". I sure would appreciate two.
Jerry |
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07-16-2008 10:42 AM
#6
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If pigs had fins...
Joined: Sep 2007
Posts: 3155
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Re: Rogers Aeroscience seeking LDRS Mach Madness fliers
Quote: Use the "Jerry" option?
8 print "DO YOU WISH TO RUN ALT2 (SINGLE/BOOSTER STAGE) VERSION "
9 input "OR JERRY (UPPER STAGE) VERSION? (ALT2=1 JERRY=2) ";rrr
Jerry
I'm dense. What do you mean? I was thinking that one way to fake this would be to create a motor profile that gets the upper stage up to the speed and altitude (that the whole rocket simulation shows for the first stage motor) and then has the rest of the real motor profile for stage 2 built into it - but that would involve a lot of trial and error. |
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07-16-2008 10:53 AM
#7
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Freeform rockets advocate
Joined: Aug 2006
Posts: 1226
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Re: Rogers Aeroscience seeking LDRS Mach Madness fliers
Quote: I'm dense. What do you mean? I was thinking that one way to fake this would be to create a motor profile that gets the upper stage up to the speed and altitude (that the whole rocket simulation shows for the first stage motor) and then has the rest of the real motor profile for stage 2 built into it - but that would involve a lot of trial and error.
If ALT4 doesn't work, maybe you could use a copy of ALT2 which definitely does. ALT4 has prettier graphs.
Jerry |
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07-16-2008 02:06 PM
#8
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Rana sapiens
Joined: Aug 2007
Posts: 2937
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Re: Rogers Aeroscience seeking LDRS Mach Madness fliers
I believe UV has access only to the new Beta version. Anyone out there with other ideas?
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07-16-2008 02:10 PM
#9
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If pigs had fins...
Joined: Sep 2007
Posts: 3155
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Re: Rogers Aeroscience seeking LDRS Mach Madness fliers
Quote:
Currently the RASAero software accepts geometry for single stage rockets with a single set of fins.
I had assumed JI's ref to ALT2 and ALT4 meant something else. What does that stand for? |
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07-16-2008 02:16 PM
#10
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Certified Level Three
Joined: Jul 2008
Posts: 266
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Re: Rogers Aeroscience seeking LDRS Mach Madness fliers
Prior (DOS) versions of the Rogers aeroscience program.
*edit*
Actually just the flight simulation portion of the suite.
I was just running it.
You should see what it says my Mongoose 54 should do on a Loki L1400  |
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07-16-2008 02:36 PM
#11
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Rana sapiens
Joined: Aug 2007
Posts: 2937
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Re: Rogers Aeroscience seeking LDRS Mach Madness fliers
Beats me--at first I thought he was referring to the Alt key, then I assumed thats the program name and update numbers. I'm in the dark as I have no versions. Jerry ENLIGHTEN us as to what the hell you're talking about.
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07-16-2008 02:38 PM
#12
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Rana sapiens
Joined: Aug 2007
Posts: 2937
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Re: Rogers Aeroscience seeking LDRS Mach Madness fliers
Quote: Prior (DOS) versions of the Rogers aeroscience program.
*edit*
Actually just the flight simulation portion of the suite.
I was just running it.
You should see what it says my Mongoose 54 should do on a Loki L1400
Well please tell!! Other question asked and answered. |
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07-16-2008 02:53 PM
#13
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Certified Level Three
Joined: Jul 2008
Posts: 266
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Re: Rogers Aeroscience seeking LDRS Mach Madness fliers
I really never trust it until I've flown it and can compare empirical results to the sim.
Some times I have to fudge the Cd ^ a little to get it to match real data.
And that's why I bought Adrian's Parrot....
Mach @ 500', max vel. M2+, 18,000' from 2k AMSL on an 80* day
If someone could enlighten me (offlist) as to how to capture a DOS screen and attach it here I could post the graphs, but the line by line data for a flight of 30 seconds coast time would probably overrun the forums.
The W9 J1999 pulls over 90g's off the pad  |
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07-16-2008 03:05 PM
#14
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Certified Level Three
Joined: Jul 2008
Posts: 266
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Re: Rogers Aeroscience seeking LDRS Mach Madness fliers
Really I posted here to find out about the new RASAero program
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07-16-2008 03:36 PM
#15
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Freeform rockets advocate
Joined: Aug 2006
Posts: 1226
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Re: Rogers Aeroscience seeking LDRS Mach Madness fliers
Quote: I had assumed JI's ref to ALT2 and ALT4 meant something else. What does that stand for?
ALT2 is BASIC and runs best on DOS. Windows 3.1 and W95 have a DOS command line that last I checked also works.
If you have any valid ALT license I would be willing to send you ALT2 to try.
Jerry |
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07-16-2008 04:21 PM
#16
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If pigs had fins...
Joined: Sep 2007
Posts: 3155
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Re: Rogers Aeroscience seeking LDRS Mach Madness fliers
Quote: ALT2 is BASIC and runs best on DOS. Windows 3.1 and W95 have a DOS command line that last I checked also works.
If you have any valid ALT license I would be willing to send you ALT2 to try.
Jerry
No license. I am using the beta RASAero program. It's part of their beta test. The invitation to Mach Madness flyers was nice but if the program is not 2 stage capable I suspect this leaves a bunch of flights out. No worries - I have other programs to use for now. |
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07-21-2008 06:02 PM
#17
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Certified Level 0
Joined: Aug 2006
Posts: 10
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Re: Rogers Aeroscience seeking LDRS Mach Madness fliers
The old ALT4 could only do 2-stage by building up a sim of the booster/sustainer model, flying that -booster only-, then taking the altitude/velocity numbers at booster burnout and entering them as initial conditions on a second sustainer-only simulation. Perhaps the new RASAero requires a similar method.
GC
(hi Jerry)
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07-21-2008 09:12 PM
#18
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Certified Level Two
Joined: Apr 2007
Posts: 57
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Re: Rogers Aeroscience seeking LDRS Mach Madness fliers
I asked them about it, since my MM entry is 2 stage, they said it isn't possible to input the initial conditions at this time but they are considering a work around.
~Andrew Diehl
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07-21-2008 09:58 PM
#19
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Freeform rockets advocate
Joined: Aug 2006
Posts: 1226
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Re: Rogers Aeroscience seeking LDRS Mach Madness fliers
Quote: The old ALT4 could only do 2-stage by building up a sim of the booster/sustainer model, flying that -booster only-, then taking the altitude/velocity numbers at booster burnout and entering them as initial conditions on a second sustainer-only simulation. Perhaps the new RASAero requires a similar method.
GC
(hi Jerry)
Hey Gary, when are you going to fix that, or better yet, delegate it to someone with more motivation and time than brains?
"They" have been considering a "workaround" to my code since 1982. Hasn't happened as of 2008.
Jerry |
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