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  #321  
Old 04-17-2006, 08:21 PM
James Pierson James Pierson is offline
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Location: Washington State
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Lightbulb New Design: Bo-Maxximus Interceptor

Thanks for all the posative feedback you guys. I may have to start
naming rockets after you folks to pay my debts.

CenturiGUy: The trick to the radius angle seems to be to start with a
90 degree corner. Radius distance seem to be half of the circle wanted.
I just play with it and keep hitting undo last button until I get what
I'm looking for.


Confessions of a model rocketeer: by James Pierson

I had been dreaming of starting my own company for several years but
after the demise of the Rocketry Perservation Society I noticed just
how many companys start up and just seem to fade away in a few years. A
few months back I decided I did not want to be one of those fade away
companys. I am also very dissapointed with the Estes design GARBAGE
that has been coming out. For years now I have been hiding and hording
my designs in my Rocketry Journal to be seen by no one. I decided to
give up the dream and share my designs for the good of all for free.
And here is where Craig's and Scott's hard work come in. I do what
comes easy to me and the real thanks goes to Craig, Scott and all you
Folks for the inspiration.

Anyway( Almost Lost My COOL there) Grinch voice.

If I start getting a fat head just slap me. I know I can count on Bill
for that.

Here is another design. I call it he Bo-Maxximus Interceptor. I
apolagize in advance if I upset you die hard Bomarc fans. Craig and
all, take a good look at this one as it needs improvement. I am not
too familar with these motors especisally.


Thanks Again JP

James Pierson
NAR#77907
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  #322  
Old 04-17-2006, 08:58 PM
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CPMcGraw CPMcGraw is offline
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Quote:
Originally Posted by Chris_Timm
I have an original design I've been flying for almost 30 years but I never drew it up in rocsim because of the designs placement of tubes out under the wings.
Heres some pics for someone to rocsim it.
Its a BT-50 size, 12" long tube.
1-3/4" long wing pods.
At one time there was a "T" tail.

I call it the XF-13D 'Jaguar'.

I'll see if I can find the pencil sketches of the other designs from the 70's.


Chris,

How close does this come to your original?
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Last edited by CPMcGraw : 04-17-2006 at 09:15 PM.
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  #323  
Old 04-17-2006, 09:14 PM
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CPMcGraw CPMcGraw is offline
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Quote:
Originally Posted by James Pierson
Here is another design. I call it he Bo-Maxximus Interceptor. I apolagize in advance if I upset you die hard Bomarc fans. Craig and all, take a good look at this one as it needs improvement. I am not too familar with these motors especisally.


James,

Was there anything specific about the design that you feel needs adjusting? I'm looking at it, and only found one item that I could simplify (main wing -- this could be done as a single line item), but nothing that I would immediately change. I like your treatment of the V-fin pod nose cone simulation. Seems very familiar to me...

That D15 appears to be the optimum motor, with deployment within a foot of apogee, and below 10 FPS Dv. It reaches flight V in 20", so a 36" rod is all you need. The C11 takes every inch of that 36" rod...
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  #324  
Old 04-17-2006, 09:20 PM
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Chris_Timm Chris_Timm is offline
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Quote:
Originally Posted by CPMcGraw
Chris,

How close does this come to your original?


Mighty close for guv'mnt work.
Does rocsim allow a T-tail and canted wingtips?
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  #325  
Old 04-17-2006, 09:24 PM
James Pierson James Pierson is offline
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Just wondering about the motors being discontinued. Apparently not. I notice the need for a 48" rod as well but too lazy to change it.
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  #326  
Old 04-17-2006, 11:21 PM
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CPMcGraw CPMcGraw is offline
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Quote:
Originally Posted by Chris_Timm
Mighty close for guv'mnt work.
Does rocsim allow a T-tail and canted wingtips?


Don't I wish!!!!

Those are "Wish List" features #3 and #2, respectively. My #1 feature is still the ability to place nose cones and transitions other than on the master centerline. With those three features, my design and simulation capability shoots up 100% from where it is right now.
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  #327  
Old 04-17-2006, 11:24 PM
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CPMcGraw CPMcGraw is offline
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Quote:
Originally Posted by James Pierson
Just wondering about the motors being discontinued. Apparently not. I notice the need for a 48" rod as well but too lazy to change it.


Ahhh, now I understand. Yes, that C11 might get a bit difficult soon. But keep in mind the reloadable 18mm and 24mm casings which can still be purchased, even if they might be in short supply.
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  #328  
Old 04-18-2006, 07:40 PM
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Chris_Timm Chris_Timm is offline
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Will rocsim detect a design that is stable in the cg/cp sense, but unstable in the fin placement sense?

Would it recognize the unstability of a maple-seed style rocket?
How about a design with the motor-mount offset to one side of a bt-70?
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  #329  
Old 04-18-2006, 08:32 PM
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CPMcGraw CPMcGraw is offline
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Quote:
Originally Posted by Chris_Timm
Will rocsim detect a design that is stable in the cg/cp sense, but unstable in the fin placement sense?


That's really the whole idea of stability -- the correct relationship between the CG and the CP. As long as the CG remains ahead of the CP, no matter how the fins are placed, the rocket should fly, even if it looks like it ought to do cartwheels. Consider the "big boys" down at the cape -- they fly without fins, but the CG/CP relationship remains the same (or close to it). They just use thrust vectoring to accomplish the same job as the fins.

I recall seeing the footage of a Delta II that lost its main engine before the solids kicked off due to a fuel leak. The computer shut down the main and the verniers. Immediately the rocket swapped ends and broke up.


Quote:
Would it recognize the unstability of a maple-seed style rocket?


You mean a rocket with a single fin, or asymetric fins? No. This is perhaps something that needs to be addressed in a future version. Currently, it will simply calculate the total fin area and how that total relates to the rest of the design.


Quote:
How about a design with the motor-mount offset to one side of a bt-70?


Again, sadly, no. I just tried a sample using some PML 2.7 parts and a BT-50 motor tube. It flew with the motor mount 0.5" and 0.75" off-center, and didn't show any results of the asymetry. This also needs some addressing. Being able to have asymetric fins with equally asymetric thrust positioning would make for some wildly interesting designs.
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  #330  
Old 04-19-2006, 05:32 PM
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Chris_Timm Chris_Timm is offline
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I found these pics from the web lounging on my harddrive.
I'm sure somebody will chime in with the name of the person who designed/built them.
A deranged egglofter!!!!
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