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  #151  
Old 08-13-2008, 12:04 AM
Tau Zero's Avatar
Tau Zero Tau Zero is offline
Incurable SEMROC Fan
 
Join Date: Mar 2005
Location: Twin Falls, Idaho, USA
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Wink Under the gun? (Aldo Nova reference)

Quote:
Originally Posted by CPMcGraw
So, now, James and I are behind the Eight Ball and need to come up with something to start using these new rings, right?
Craig,

*If* you feel so inclined.


Actually, I figured if I needed them, other people might like the *option* (wink wink, nudge nudge) of having them.

So enjoy!


Cheers,
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Jay Goemmer
"Centuri Guy"/"Tau Zero"
Semroc SAM #0029
NAR 86131


“Centuri fret buzz in an updated form.”
Bill “Wallyum” Eichelberger re: Estes Flutter-By
03 Sept 2014
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  #152  
Old 08-15-2008, 07:50 PM
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snaquin snaquin is offline
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Location: Louisiana
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Default New Plan -- Loon-E Lander

Design uses Semroc BTH-70 SLS grade heavy walled tubing and shares the SLS ARCAS nose cone with 1/8" thick sturdy basswood fins. My original design also shared the SLS ARCAS tail cone but I wasn't truly happy with the CG/CP when loaded with a 24mm adapter and engine inside the originally planned 29mm engine tube or with 29mm engines so the tail cone is custom.

Flight simulation with Estes E9 engines to almost 1,300 feet, D12 engines to about 800 feet.

Posted simulations assumed a 1/8" x 36" launch rod.

Length: 23.9"
Diameter: 2.25" (BTH-70)
Span Dia: 6.80"
Weight: 4.13 oz

D12-5......807'.........Dv 8 FPS
E9-6......1,295'........Dv 15 FPS



.
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SAM# 0052
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  #153  
Old 08-16-2008, 01:52 PM
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CPMcGraw CPMcGraw is offline
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Default Magic Number Update

33...
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  #154  
Old 08-16-2008, 09:58 PM
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CPMcGraw CPMcGraw is offline
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Exclamation New Plan -- Yellow Bird

Another "Schoolyard Sounder" for 13mm motors.

It's always interesting to see what a simple design can do when it's loaded up with a 13mm motor. Never underestimate the power in an "A" class motor!

Length: 14.775"
Diameter: 1.04" (ST-10)
Fin Span: 5.04"
Weight: 0.87 oz

Using 1/8" balsa fins:...A10-3T......315'......Dv 7.2 FPS.......36" x 1/8" rod
Using 3/32" balsa fins:..A10-3T......334'......Dv 9.8 FPS.......36" x 1/8" rod
Using 1/16" balsa fins:..A10-3T......350'......Dv 11.6 FPS......36" x 1/8" rod

The A3-4T will work, but the Dv is much higher, and the altitude isn't much better. Use the A10-3T.

Enjoy!

Magic Number is now 32...
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  #155  
Old 08-17-2008, 04:19 PM
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CPMcGraw CPMcGraw is offline
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Exclamation New Plan -- Sport Shot

A quick-build design, with a paper boat tail. Flies on 18mm motors.

Length: 19.00"
Diameter: 1.04" (ST-10)
Fin Span: 4.83"
Weight: 1.2 oz

A8-3......255'.......Dv 14 FPS......36" x 1/8" rod
B6-6......630'.......Dv 26 FPS......36" x 1/8" rod
C6-7......1350'......Dv 17 FPS......36" x 1/8" rod

Enjoy!

Magic number is now 31...
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  #156  
Old 08-18-2008, 01:51 AM
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CPMcGraw CPMcGraw is offline
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Exclamation New Plan -- Flis Ram Scoop Technology Demonstrator

Ever since I saw Jim Flis' "Borealis" design, it has made me think more than a few times about how he used those narrow rings as "tube fins". I've been wanting to do something similar. This new design is obviously more than a little inspired by Jim's imagination, meaning it just stood out to be... um... imitated (yeah, that's the ticket... )...

To be fair, there is another design somewhere here on YORF using similar narrow tube fins, and that design has some additional bearing on how this design was worked out. (Solomoriah, didn't you share something with us a few years ago like this?)

To put this model into Jim's universe and story line, it represents a small demonstration ship that was built and flight-tested long before any of his fleet of capital ships using "Ram Scoop" technology came on-line. It would have been used to gather engineering data and to work out any major bugs and 'gotchas' before committing greater resources.

This design uses the A10-3T and still puts in a respectable 244' of altitude. However, I have to give this caveat about the way the design came together in RockSim: The fourth ring, which ties the outer rings to each other, is modeled as an INSIDE TUBE, and not as a RING FIN. This may affect the way the real-world model actually performs. Using the RF method, the altitude is cut in half and the Dv number shoots well above 20 FPS. Using the IT method, the Dv drops to a comfortable 2 FPS. After the experience with the BARCLONE Andromeda design, and with Jay's Tau Zero prototype, I am convinced the RockSim RF routine is in error, but by how much I cannot say. Here's the reason I say this: When I delete that ring, the altitude jumps up to 253', and the Dv only gets to a little over 3 FPS, in a run of 10 simulations. In other words, as an IT it has a documented effect, but it's not detrimental.

Length: 19.80"
Diameter: 0.908" (ST-8)
Fin Span: 7.24"
Weight: 1.27 oz


The A3-4T, 1/2A3 and 1/4A3 are not recommended.

Enjoy!

Magic number now at 30...
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  #157  
Old 08-18-2008, 12:14 PM
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CPMcGraw CPMcGraw is offline
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Default Magic Number Update

29...

Jay just reminded me of one that slipped through the cracks: THREAD LINK

"Carrier Wave"...
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  #158  
Old 08-19-2008, 10:31 PM
James Pierson James Pierson is offline
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Join Date: Dec 2005
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Thumbs up New Design: Multi Probe Version 3

I have been working on this particular design, off and on, for about a year now. It was alot shorter and very unstable. In order to make this beast stable I had to lengthen the main BT to a full 18 inches long and use a longer nose cone as well. All seems to work well this the looks of this design however, it does lack altitude preformance.

Enjoy and Thanks Again, JP

James Pierson
NAR# 77907

Multi Probe 3 (18mm)
Launch guide length: 36.0000 In

MOTOR.................MAX. ALTITUDE...........DEP. VELOCITY
B4-4.......................328.21850 Ft...............14.8204 ft/s
B6-4.......................336.45341 Ft.................9.9480 ft/s
C6-5.......................782.27362 Ft. ...............7.3040 ft/s

.
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  #159  
Old 08-20-2008, 11:18 AM
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CPMcGraw CPMcGraw is offline
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Default

Quote:
Originally Posted by James Pierson
...it does lack altitude preformance...


Doesn't look like it lacks much, JP. For a model with this much hanging out in the breeze, 320+ on a "B" sounds like a good compromise. I really like the Dv numbers.

Magic Number is now 28...
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  #160  
Old 08-20-2008, 02:01 PM
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CPMcGraw CPMcGraw is offline
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Exclamation New Plan -- Crossbow

OK, here's a strange idea that just happens to look cool. The concept should be self-evident...

Consider this as the first version, with a possible longer shaft version if I can get the Dv numbers down a bit.

Length: 24.47"
Diameter: 1.04" (BC-760)
Fin Span: 13.91"
Weight: 1.07 oz

A8-3......270'.......Dv 15 FPS......36" x 1/8" rod
B4-4......595'.......Dv 25 FPS......36" x 1/8" rod
B6-4......600'.......Dv 29 FPS......36" x 1/8" rod
C6-5......1195'......Dv 25 FPS......36" x 1/8" rod

Addendum:

A10-3T......305'......Dv 13 FPS......36" x 1/8" rod
A3-4T.......310'......Dv 16 FPS......36" x 1/8" rod (Takes 34", so consider this carefully)

Enjoy!

Magic Number now at 27...
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Last edited by CPMcGraw : 08-20-2008 at 02:19 PM.
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