This is one of those odd-ball designs that has been stuck in my brain for several years. I keep revisiting it to see if I can work out the details of mass balancing and general stability. The design is asymmetrical, with more mass on the "bottom" (ahem...), and requiring some sort of compensation on the top. In this design, I'm hoping I can create an equalling "drag force" to keep the nose pointed in the right direction.

This may require more tinkering to get it right, so consider this version as a Mk I...

Length: 37.00"
Diameter: 1.04" (ST-10 largest tube)
Fin Span: 14.45"
Weight: 2.23 oz


B6-4......AVG 325'......Dv AVG 14-15 FPS......3/16" x 48" launch rod


Enjoy!

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Attached Files

Exoteria.rkt (170.9 KB, 182 views)

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Craig McGraw

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I absolutely love these types of rockets......very cool design.

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Thanks!

This offset design is an interesting challenge just to work up in RockSim. Getting the design to balance out in flight is another matter. I need to break down and order some parts...

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Craig McGraw

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Here's a set of templates for the wings, vertical fins, and the three pylons. I'm supplying both a JPG and a CDR file (for those of you with Corel Draw 12 or better). The fins are cut from 3/32" sheet balsa.

Keep in mind the tube pylons are not solid balsa blobs, but rather are hollow gas passages. My design calls out balsa (a RS limitation), but actually uses 3/16" launch lugs as the central structure, with 0.02" matteboard skins and square balsa strips for the leading and trailing edges.

The nose cone for the rear pod should be hollowed out, and the lugs from the rear pylons should extend through the balsa to the opening.

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Attached Files

Patterns.zip (11.1 KB, 80 views)

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Craig McGraw

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AMA 352635

Craig,

Can you output the file as Corel Version 10? That is the version we use on the laser cutter. I had 13 but it was not as stable.

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Carl McLawhorn
NAR#4717 L2
semroc.com

Funny you should mention 13, I just DL'd the 15-day demo of X3...

Attached below is a zip with a V10 CDR. Let me know if I need to do something else to it. I've cleaned up the lines manually to remove the "cut throughs", but still being a novice with Draw I may have missed something.

Attached Files

Exoteria Patterns V10.zip (11.0 KB, 87 views)

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Craig McGraw

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SAM 0044
AMA 352635