Well, everyone, here we have it! This design represents the 800th model posted to BARCLONE, and I'm sorry it has to be such a little thing...

I present the Lil' Leaguer, a 13mm ST-11 design emulating the RRL designs. It qualifies as a "Schoolyard Sounder", although it is more of a sport design than a sounding rocket. The hardest part to make will be the canopy (vac-formed clear poly, 0.002" thick).

Length: 15.75"
Diameter: 1.17" (ST-11)
Fin Span: 7.55"
Weight: 0.97 oz


A10-3T......282'......Dv 5 FPS......36" x 1/8" standard rod


I'll work up some fin sheet "death ray" patterns shortly.

Enjoy!

Attached Thumbnails

   

Attached Files

Lil' Leaguer.rkt (118.6 KB, 88 views)

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Craig McGraw

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SAM 0044
AMA 352635

Nice! Fighter jet styling is ALWAYS cool!

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Never trust an atom. They make up everything.

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NAR# 94042
SAM# 0078

That is a VERY cool looking rocket!

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I plan ahead that way I don't have to do anything right now.

Oh by the way, I'm not here just for the "olde" rocket discussions.

Here are the CDR files for the fin sheets. Sheet 1 is 4" x 9.6" x 3/32", and sheet 2 is 4" x 6" x 1/16".

Addendum: The transition on the rear of the "dowel pods" are just small fillers shaped to a 1" x 1/8" ogive, then split and sanded to fit. That eliminates having a weakened main fin. The only notch required is the short mount point on the leading edges.

Attached Thumbnails

   

Attached Files

Lil' Leaguer.zip (16.1 KB, 76 views)

__________________
Craig McGraw

BARCLONE Rocketry -- http://barclone.rocketshoppe.com
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SAM 0044
AMA 352635

Looks very good!

Here are the files ready for the laser cutter. I just cut a few sets to time them to get costs.

FBC-800 would be $5.40 for a set.

Attached Files

FBC-800 (Lil' Leaguer).zip (15.6 KB, 75 views)

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Carl McLawhorn
NAR#4717 L2
semroc.com

Thank you, Carl!

Was I very far off with my files?

I'm going to try writing up a set of instructions for this one, and I'll post a PDF here soon. Working up that canopy will be the determining factor for going farther...

__________________
Craig McGraw

BARCLONE Rocketry -- http://barclone.rocketshoppe.com
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SAM 0044
AMA 352635

After reviewing the patterns I posted earlier and studying the way the vertical fin halves actually come together, I realized they were not quite right. RockSim introduces some "gotchas" in the fin export. While it did a good job following the pattern of the ogive transition at the end of the probe, it did not correctly extrapolate (good 50-cent word) the step at the very rear of the fin, just behind the trailing edge of the main wing.

As I looked closer at the pattern, the true height of the ogive transition above the top surface of the main fin was really not enough to justify cutting the curve. It would also have been a real royal pain to fill that gap with a piece of balsa and round it out properly. Most of that transition was "inside" the area of the main fin.

The new cutting pattern and the revised RKT file make this part of the construction easier. I have eliminated the ogive transition from the tip probe dowel stock. It now ends where the notch is located in the leading edge of the main fin. The vertical fin begins where the dowel ends, and fits flush with the top surface all the way to the rear edge. Now, the vertical fin has a "step down" that is 1/2 the thickness of the main fin. This allows the top and bottom V-fins to meet together behind the main fin. You can easily glue the top and bottom V-fins together along this root before sliding them onto the main fin. Construction is now greatly simplified.

I hope this helps everyone who is considering building this model.

Carl, don't put the old 1/16" sheet into production! Use this new pattern.

Attached Thumbnails

       

Attached Files

Lil' Leaguer.rkt (126.1 KB, 111 views)

__________________
Craig McGraw

BARCLONE Rocketry -- http://barclone.rocketshoppe.com
BARCLONE Blogsite -- http://barclone.wordpress.com
BARCLONE Forum -- BARCLONE Forum

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SAM 0044
AMA 352635

(Attached Zip containing CDR10 Fin Sheet)

Attached Files

Lil' Leaguer Fin Sheet 2 Corrected.zip (5.9 KB, 78 views)

__________________
Craig McGraw

BARCLONE Rocketry -- http://barclone.rocketshoppe.com
BARCLONE Blogsite -- http://barclone.wordpress.com
BARCLONE Forum -- BARCLONE Forum

BARs helping BARs

SAM 0044
AMA 352635