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  #261  
Old 03-19-2006, 09:02 PM
James Pierson James Pierson is offline
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Join Date: Dec 2005
Location: Washington State
Posts: 654
Wink Mini Jet #4

Here is Mini Jet #4. I hope you folks enjoy it. The question seem to be, which one to build?

Thanks Again,

James Pierson
NAR #77907
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  #262  
Old 03-20-2006, 10:37 PM
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CPMcGraw CPMcGraw is offline
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Exclamation New Plan -- Falconaire

Similar to the Spectral Queen design, this is also a cluster of 13mm motors, separated from each other, but without the complex ducting through pylons. Again, I use a nose cone as a boattail. The motor tubes are mounted through the cone.

Performance looks great in RocSim...

Length: 28.55"
Diameter: 1.34" (ST-13)
Fin Span: 6.37"
Weight: 1.86 oz (empty)

(2) A3-4T.....385'.....3 FPS

Enjoy!
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  #263  
Old 03-22-2006, 02:09 PM
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CPMcGraw CPMcGraw is offline
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Exclamation New Plan -- Flash

Another Schoolyard Sounder design.

Similar to last year's Streak, but in a three-fin version. Nothing fancy, just trimmed to offer excellent performance on the 1/2A and 1/4A motors.

Streamer recovery.

Skill Level 1.

Length: 12.75"
Diameter: 0.759"
Fin span: 2.89"
Weight: 0.5 oz

1/4A3-3T.....115'.....18 FPS
1/2A3-4T.....280'.....14 FPS
A3-4T........600'.....15 FPS

Enjoy!
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  #264  
Old 03-25-2006, 12:10 AM
James Pierson James Pierson is offline
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Lightbulb New Design: Mini Jet #5

Here is MIni Jet #5. Same basic body core, however the main wings and engine pods are changed. Hope you folks enjoy this one.

James Pierson
NAR #77907
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  #265  
Old 03-25-2006, 04:30 PM
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CPMcGraw CPMcGraw is offline
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Exclamation New Plan -- 1.3X EAC Viper

I thought I heard someone mentioning out loud they were wanting to do an upscale of this one, so I decided to come up with a very simple version based on SEMROC ST-13 components...

One change I added to this version is an ejection charge baffle, located at the joint of the two body tubes. One non-simulated afterthought would be to glue a 1/4" or 5/16" hardwood dowel at the center of the baffle and tap the forward end with 2-56 threads; then attach the forward plate of the baffle in place with a matching nylon screw. This would allow for easier cleaning of the burnt particles that will accumulate inside.

Length: 28.7"
Diameter: 1.34"
Fin Span: 6.84"
Weight: 2.23 oz

B4-4.....270'.....25 FPS
B6-4.....270'.....20 FPS
C6-5.....670'.....18 FPS

Skill Level 1.

Enjoy!
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  #266  
Old 03-25-2006, 04:41 PM
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CPMcGraw CPMcGraw is offline
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Exclamation New Plan -- Swizzle Pick

A smaller derivative of the Swizzle Stick, based around SEMROC ST-10 components. Uses Apogee's 6mm tubing for the ring fins. The launch lug runs through one of the rings, so a 0.05" thick cardstock (or 1/16" thick balsa) standoff is needed (not simulated in the file).

Skill Level 1.

Length: 23.2"
Diameter: 1.04"
Fin Span: 1.54"
Weight: 2.14 oz

Only two motors are recommended:

A8-3.....155'.....20 FPS
C6-3.....560'.....10 FPS

Enjoy!
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  #267  
Old 03-25-2006, 05:23 PM
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CPMcGraw CPMcGraw is offline
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Exclamation New Accessory -- Exploded diagram for Ejection Charge Baffle

I figured you might want to have this diagram handy if you decide to build the 1.3X EAC Viper design. It might also come in handy if you want to duplicate this idea in other models. Consider this not so much as a final-form design, but as a pattern for how to do something similar in other body tube sizes...

Size shown is for the ST-13 tube...

Be sure to look carefully at the "End View" to see how the inside tubes mesh together. The length of the gas passages causes them to overlap, meaning the gasses have to "zig-zag" around two tight corners to make it through. The hot particles can't move like this...
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  #268  
Old 03-25-2006, 05:36 PM
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tbzep tbzep is offline
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Quote:
Originally Posted by CPMcGraw
I thought I heard someone mentioning out loud they were wanting to do an upscale of this one, so I decided to come up with a very simple version based on SEMROC ST-13 components...

One change I added to this version is an ejection charge baffle, located at the joint of the two body tubes. One non-simulated afterthought would be to glue a 1/4" or 5/16" hardwood dowel at the center of the baffle and tap the forward end with 2-56 threads; then attach the forward plate of the baffle in place with a matching nylon screw. This would allow for easier cleaning of the burnt particles that will accumulate inside.

Length: 28.7"
Diameter: 1.34"
Fin Span: 6.84"
Weight: 2.23 oz

B4-4.....270'.....25 FPS
B6-4.....270'.....20 FPS
C6-5.....670'.....18 FPS

Skill Level 1.

Enjoy!


That looks good but it looks way too long for scale. Hang on and let me do some figuring...

ST-13 is 1.34" OD
Original Viper is .976 OD
Scale factor is 1.373X

Length of original Viper is 13.875 so the 1.373X version should only be about 19 inches.
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  #269  
Old 03-25-2006, 05:39 PM
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tbzep tbzep is offline
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Quote:
Originally Posted by CPMcGraw
I figured you might want to have this diagram handy if you decide to build the 1.3X EAC Viper design. It might also come in handy if you want to duplicate this idea in other models. Consider this not so much as a final-form design, but as a pattern for how to do something similar in other body tube sizes...

Size shown is for the ST-13 tube...

Be sure to look carefully at the "End View" to see how the inside tubes mesh together. The length of the gas passages causes them to overlap, meaning the gasses have to "zig-zag" around two tight corners to make it through. The hot particles can't move like this...


That's a cool little design.
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  #270  
Old 03-25-2006, 06:50 PM
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CPMcGraw CPMcGraw is offline
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And now, here's a simplified version that only uses a single main body tube instead of two smaller tubes...
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Last edited by CPMcGraw : 03-25-2006 at 07:30 PM.
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