Good combination of elements, James. And the optimum motor is the A3-4T. Really neat!

Another Schoolyard Sounder. Almost all of these designs using the 13mm motors are great examples of what can be done with small fields in mind.

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Thanks alot guys for all the kind words as they are greatly appreciated. I think that the greatest compliment that a rocket geek like me could have is for someone to actually build one of my posted designs. Now that would be cool.

Here is a design I cooked up called the Guardian. All I had to work with was a end view drawing I had in my rocketry journal. Hope you all like it.

Thanks Again and Enjoy, JP

James Pierson
NAR# 77907

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Guardian 13mm.rkt (89.2 KB, 87 views)

James,

You've been putting out some good work, especially in this 13mm category. I'm really pleased you've concentrated your efforts in this area. As I've said before, most of us just don't have the large fields available to us. A local schoolyard is the best we can hope to use. These may not be the highest-flying designs, but you've found like I did that you can get a lot of performance out of a smaller motor, and have an eye-catching design, too.

There are several of your designs that I'm looking to build. That PQM you came up with earlier, for example.

Here's a heads-up for everyone: The "catalog" that I was trying to work up has turned into something a bit more challenging in the form of a website update. This update will use a database to keep a record of downloads and which designs are most-popular, and will have a "What's New" section to showcase the most recent additions. Hopefully I can include a Gallery of photos whenever we start receiving them...

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Another Schoolyard Sounder...

Optimum motor is the A10-3T.

Open-frame fins and the BC-760 nose cone...

Altitude should be consistently around 275', with a Dv of 4 FPS, a stability margin of 3.78 loaded, and only requiring 21" of launch rod.

Enjoy!

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Tau Eridani.rkt (118.9 KB, 113 views)

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Everyone,

I'm putting a screenshot of my current project on a new thread, and I'd like some feedback. The particulars about it will be told there...

It's not a new rocket, but it is rocketry-related...

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Here is a design I call the Tau Astron Nomex. I have experimented a little with Jay's Tau nose cone and realize just how darn good it makes a longer rocket look. Very Very Cool! Although I would rather have it in a lighter PNC version where it would be a little lighter and clay nose wieght could be added if necessary.

As far as these thin rounded fins go, I am calling them out as 3/32" thick balsa, yet I think they need not be cardstock.(wieght factor). Here are two other choices:

A: Use 1/16" balsa and rienforce both sides with mailing label self stick paper???
B: Use the 3/32" balsa and paint both sides after mounting with CA??

Both choices should be lightwieght and strong. Any opinions and other options welcome.

This one is for the Sci-Fi fans.

Enjoy and Thanks Again, JP

James Pierson
NAR# 77907
.
.

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Tau Astron Nomex.rkt (73.3 KB, 113 views)

Very neat and cool, James!

One more for the BARCLONE tally. I need to get these last few sent to Scott for the roundup...

Your option "B" is the way to go, unless you can locate some really flat, unwarped 1/16" sheet stock. You'd have to hand-pick the sheet. Laminating with label stock will improve them, yes, but you still need a warpless balsa core to begin with. Pressing the laminated fins between two heavy flat irons overnight wouldn't hurt, either. Using 3/32" gives a little more dimensional stability.

Now, doing all of that plus having Carl cut out the laminated fins with his Krell Laser might keep the stresses in the balsa from coming back. Or not...

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Here is another of the sci-fi wierd design. This one is an 18mm and the 13mm version will be posted ASAP.

Enjoy and Thanks Again, JP

James Pierson
NAR# 77907

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Sky Shadow 18mm.rkt (60.3 KB, 106 views)

I had to take a break from the really fancy stuff and just put out a simple design.

This is a 2X upscale of the Estes Javelin #2005, using SEMROC ST-13 components. All motors reach flight V in the length of a 36" 3/16" rod, except for the E9-6 which needs a 48" 3/16" rod.

Length: 23.4"
Diameter: 1.34"
Fin Span: 7.34"
Weight: 1.83 oz

C11-5.......649'.......Dv 3 FPS......Margin 2.04
C6-5........727'......Dv 17 FPS......Margin 2.66
D12-5......1153'......Dv 16 FPS......Margin 1.74
D15-6......1291'.......Dv 6 FPS......Margin 1.69
E9-6.......1744'.......Dv 5 FPS......Margin 1.28
F24-7......2360'......Dv 11 FPS......Margin 1.13

Enjoy!

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Super Javelin.rkt (76.4 KB, 111 views)

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Another upscale of a famous Estes classic. This is a 2X Wizard, using SEMROC ST-13 tubing. 24mm motor mount. All motors except the E9 reach flight velocity on a 36" 3/16" rod. The E9 requires a 48" 3/16" rod.

Length: 24.63"
Diameter: 1.34" (ST-13)
Fin Span: 8.84"
Weight: 1.89 oz

C11-5.......720'......Dv 12 FPS......Margin 2.80
D12-7......1330'......Dv 28 FPS......Margin 2.53
D15-6......1503'......Dv 18 FPS......Margin 2.48
E9-6.......2008'......Dv 21 FPS......Margin 2.11
E30-7......2289'.......Dv 7 FPS......Margin 2.50
F24-7......2809'......Dv 22 FPS......Margin 1.96
E6-6.......3078'.......Dv 9 FPS......Margin 2.40

Enjoy!

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Super Wizard.rkt (84.9 KB, 111 views)

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