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  #191  
Old 01-07-2006, 11:43 PM
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Tau Zero Tau Zero is offline
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Location: Twin Falls, Idaho, USA
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Exclamation Musical Instrument Digital Interface = "MIDI"

Quote:
Originally Posted by CPMcGraw
And yes, I understand the reference. My first computer was the Commodore 64, and that was often used as a MIDI controller.
Actually, the explanation was for those of us here who might not have ever heard of the "new-fangled" (post 1960s and -70s) meaning for "midi" ... I mean, "MIDI."

I also made up a preliminary decal for a "MIDI-Roc" design, which will probably be a Semroc LT-115/125 2.25X upscale of my BT-5 original BAR "Mini-Roc," which involved kitbashing an Estes "Nike Arrow." The decal has 3 MIDI port symbols which are labeled "IN," "OUT," and "THRU."


Cheers,

--Jay
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Last edited by CenturiGuy : 01-08-2006 at 01:18 AM.
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  #192  
Old 01-18-2006, 06:05 PM
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CPMcGraw CPMcGraw is offline
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Exclamation New Plan -- Spear Tip

Another "Schoolyard Sounder"...

Uses 13mm A3-4T. Over 450' altitude. Less than 5 FPS deployment V...

Although the fin is shown in the RKT file as having a split (limitation of the program, grrrrr...) the actual fin shape has no split. You might find it necessary to construct the fin in multiple pieces to align the grain for better strength and dimensional stability.

See the attached fin patterns...

Enjoy!
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Name:  Spear Tip Fin Pattern.jpg
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Size:  153.3 KB  
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File Type: rkt Spear Tip.rkt (32.3 KB, 110 views)
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Last edited by CPMcGraw : 01-18-2006 at 07:13 PM. Reason: Added a fin pattern image
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  #193  
Old 01-24-2006, 03:04 PM
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CPMcGraw CPMcGraw is offline
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Location: Mobile, Alabama
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Default New Plan -- Stiletto I

Borrowing a bit from the Centuri Stiletto, the BARCLONE version is based around a 12" ST-7 tube. Ours is a single-stage model, using the 13mm A3-4T to reach over 500'.

A simple build, with lots of performance for small-field flying.

Skill Level 1.

Enjoy!
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File Type: rkt Stiletto I.rkt (36.5 KB, 116 views)
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  #194  
Old 01-24-2006, 03:44 PM
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CPMcGraw CPMcGraw is offline
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Default New Plan -- Stiletto II

An upscale of the Stiletto I, this version is also a single-stage model, but uses a full 18" ST-8 tube. Altitudes from 200' to over 1000' on 18mm motors.

Streamer recovery.

Skill Level 1.
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Name:  Stiletto II.jpg
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File Type: rkt Stiletto II.rkt (55.7 KB, 119 views)
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  #195  
Old 01-25-2006, 06:41 PM
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CPMcGraw CPMcGraw is offline
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Default New Plan -- One Good Egg

This one started out as just a phrase, and sat on my computer as an empty folder for nearly two years before I decided to do something with it. I wanted to present an egglofter, but not just another "Scrambler" or "Omloid" style of design. Still, there are certain patterns such vehicle design tends to migrate toward, and this one is no exception. Basic large-diameter payload on a slender sustainer body, tricked out with an oversized horse of a motor...

The builder will need to mold the nose cone and transition in FG or VacForm plastic using a custom-turned form. The transition uses an ogive shape, just to make things different...

General specs:

Length: 36.7"
Payload diameter: 2.04" (ST-20 tubing)
Sustainer diameter: 1.34" (ST-125 tubing)
Motor: 29mm (ST-115 tubing)
Weight: 9.25 oz empty
Fin Span: 6.34"

F26FJ-9..........2130'...........22 FPS
F25-9............2458'...........13 FPS
G40W-10..........3280'............5 FPS
G64-10...........3730'...........28 FPS
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Name:  One Good Egg.jpg
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File Type: rkt One Good Egg.rkt (57.3 KB, 80 views)
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  #196  
Old 02-13-2006, 01:00 PM
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CPMcGraw CPMcGraw is offline
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Default Spear Tip -- Update

I am pleased to announce that this model has been built and flown successfully on both A3-4T and A10-3T motors by Geoffrey Kerbel. His observed flight performance was very close to what RockSim predicted it should be, between 400' and 460' on both motors.

Attached is a photo of his model, with a true conical NC instead of the Ogive of the original design.
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Last edited by CPMcGraw : 02-13-2006 at 01:01 PM. Reason: Forgot the title...
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  #197  
Old 02-13-2006, 01:40 PM
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CPMcGraw CPMcGraw is offline
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Exclamation New Plan -- Scythe

Uhmm huh, one of them thar Flyin' Slingblades O' Death...

The RKT file has a simplistic color scheme, but you can probably match the colors better if you visit a farm supply shop and look at the self-propelled hay harvesters...

RockSim says this model is very stable, with a margin of 16 using a B6-2, and 15 using the C6-3. Don't fly with any other motors, as this model only reaches 400' with the C6, and 130' with the B6.

Use two 12" parachutes for recovery.

Skill Level 2 (mostly for size)...
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Name:  Scythe.jpg
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File Type: rkt Scythe.rkt (50.8 KB, 83 views)
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  #198  
Old 02-13-2006, 02:35 PM
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CPMcGraw CPMcGraw is offline
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Default New Plan -- Spear Tip II

A 1.4X upscale of the Spear Tip, suggested by Geoffrey Kerbel. This one uses the ST-10180 body tube and the BC-1052 NC.

Simulation shows the performance to match the smaller design, with all three power selections giving deployment Vs of below 10 FPS.

Length: 26.1:
Fin Span: 6.125"
Empty Weight: 1.53 oz

A8-3.....174'.....9 FPS
B4-4.....410'.....3 FPS
C6-5.....875'.....2 FPS
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Name:  Spear Tip II.jpg
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File Type: rkt Spear Tip II.rkt (51.5 KB, 114 views)
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Last edited by CPMcGraw : 02-13-2006 at 05:55 PM.
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  #199  
Old 02-13-2006, 07:47 PM
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CPMcGraw CPMcGraw is offline
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Exclamation New Plan -- Diaper Loader

I mentioned this one tongue-in-cheek awhile back, but realized it might just make a great model if the right image could be located. For the record, the image I chose was a toon-ish graphic located through Google. The artist is listed as Torben Soettrup...

Flight specs are nothing to sneeze at, either:

B4-4.....295'.....16 FPS
B6-4.....305'.....10 FPS
C6-5.....810'.....13 FPS
D3-5....1925'.....17 FPS

Stability with a C6 is 1.02 with a 3/8 oz weight in the tip of the NC. Do not use the A8-3, as the deployment V is too high, and the max altitude is only 100'.
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File Type: rkt Diaper Loader.rkt (64.0 KB, 89 views)
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  #200  
Old 02-19-2006, 03:52 PM
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CPMcGraw CPMcGraw is offline
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Exclamation New Plans -- Aerobee 150 (Three Versions)

Last year I tossed up a semi-scale version of the MMI/EIRP semi-scale Aerobee-Hi. While this was a good-looking model in its own right, it was not entirely accurate in some of the dimensions, notably the nose cone.

Using scale data located on the internet, I have drawn up and simulated three different versions of this model, which was also known as the Aerobee 150. As with the earlier models, these represent only the upper stage, and not a full-house two-stage stack. I will try to come up with a correct booster for these variants at a later date. I am sticking with the ST-8 body tube, and I am resizing the fins to their correct scale width of 23.5" (1.4" model fin width). The original rocket was 15" in diameter.

The three versions presented here are:

Aerobee 150 RTV-N-8, 241.8" long (14.64" model length)
Aerobee 150 'Standard', 283.6" (17.17" model length)
Aerobee 150 RV-N-13b, 298.6" (18.08" model length)

One additional version, the RTV-A-1a/RTV-N-10a, was the same length as the RTV-N-8, but used a different sustainer motor with a higher initial impulse (4100 lbs for 32 seconds, versus 2600 lbs for 45 seconds).

Note that there were many variations of the basic Aerobee 150 design, with differing lengths of the conduit shrouds and even the shape of the fins. The fins drawn for these models represent the common rounded-tip fins seen in a number of images, and are now based on actual photographs; they have been widened to the correct span, and are as close to the correct LE sweep and chord length as the photograph allowed. One notable variation also seen was a sharp-cornered fin set.

These models represent the original series configuration. There was a later "A" series that used four sharp-cornered fins and which was mated to a more powerful NIKE booster.

You will note in the RKT file a designation for a SEMROC BC-853 nose cone. I'm wearing a big Cheshire Cat grin right now, because I asked Carl if this nose cone could be created, and he agreed to add it to the collection. This is a Tangent-Ogive shape, with a length of 5.3". It closely matches the actual nose cone length of 87.8". When you compare these models to the earlier BARCLONE version, you can see the improvement.

Enjoy!
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Name:  Aerobee 150 RV-N-13b.jpg
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Size:  38.9 KB  Click image for larger version

Name:  Aerobee 150 RTV-N-8.jpg
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Size:  39.1 KB  
Attached Files
File Type: rkt Aerobee 150 RV-N-13b.rkt (65.7 KB, 119 views)
File Type: rkt Aerobee 150 RTV-N-8.rkt (65.7 KB, 122 views)
File Type: rkt Aerobee 150 Standard.rkt (65.7 KB, 118 views)
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Last edited by CPMcGraw : 02-19-2006 at 06:15 PM. Reason: Technical correction...
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