Here's the 3D version of Thingus I. Flight specs are pretty good, too.

Length: 12.41"
Diameter: 0.976"
Fin Span: 4.25"
Weight: 1.5 oz

A8-3.....175'.....10 FPS
B6-4.....410'......2 FPS
C6-5.....865'......6 FPS

Thanks, James!

Enjoy!

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Attached Files

Thingus_1.rkt (84.9 KB, 91 views)

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Craig McGraw

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Craig fixed it...

I really like this design -- shades of the Custom Landviper, with a twist...

Length: 37.375"
Diameter: 1.64"
Fin Span: 7.643"
Weight: 5.3 oz

Almost 2900' on an F39... I need to tweak the delay times a bit from the original motor list before I turn it loose...

It has appeal...

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Craig McGraw

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Craig has been tweaking it...



I did have to add a "few" items to the parts list, James. Hope you don't mind...

The new parts include an electronics package for triggering the deployment charge as a separate event, instead of as a built-in feature of the motor. I elected to lengthen the motor tube a little and change the motor selection to only 24mm reloadables. This allowed me to shift the deployment to apogee, instead of an arbitrary time after burn-out. This allowed the rocket to drift upward to the maximum it would achieve, and then deploy the laundry at very gentle velocities, none greater than 15 FPS; most below 10 FPS.

Altitude performance suffers from the added weight, and of course, the selected packages may not be the final units one would use; but it allows the weight of the rocket to be close in the simulation. That same F39 only gets 2100' now, but the deployment velocity is below 2 FPS, and I'll take that compromise instead of shredded laundry any time.

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Attached Files

Static_Probe_IIB.rkt (85.4 KB, 99 views)

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Craig McGraw

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This one I call the Sabre Dart. I got the idea from one of the Star Wars movies last year and built it. Feel free to "Tweek" these designs all you want. I personally love to see a mid to high power Sabre Dart, yet I worry about fin sheer with these forward pointing fins?? Enjoy and thanks for helping the computer un-ed-u-ma-ca-ted.

James Pierson NAR#77907

Attached Files

Sabre Dart.rkt (56.3 KB, 107 views)

Good looking design, James! Keep these coming!

This one really has only one good motor to fly with, and that's the A3-4T. One thing to look at is the deployment velocity column. This tells you how fast the rocket is moving when the recovery device is deployed. When you work up a new design, always look at this number and try to get the lowest possible value.

I personally like to get under 20 FPS for my designs, not always achieved, but that's my target number. I consider anything above 20 in the danger zone, and a potential shred. When I see a design come in under 20, it's a "proven"; under 10 and it's really in safe territory; under 5 and I try to examine everything I've done, so that I can learn from it. Sometimes I get a hit below 2 FPS, and what this amounts to is the model is practically hovering in one place while the recovery laundry just liesurely pops out...

As you get comfortable with RS, you'll start to get the feel for picking working combinations of components. You're already on your way! Just keep pushing. I have to do that, or my gears get rusty...

Anyway, here's the 3D shot...

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Craig McGraw

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I hope you all enjoy this one. To the Final design I added three centering ring near the NC and added 1/2 oz. of nose wieght to slow it at apogee. I wanted to be able to use a B6-2 for first flight purposes. Tweeking like Craig said. It flies great on C5-3 and C6-6.

James Pierson
NAR #77907

Attached Files

Angstrom's Arrow.rkt (127.0 KB, 119 views)

...And here's the 3D image...

...It's blue...

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Craig McGraw

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You really did tweak this one, James!

The best motor is the C6-3, on which I got one run as low as 0.92 FPS on the simulator, with an altitude of just over 350'. That's plenty for a model with this fragility and complexity. Mid-body separation, with an 18" parachute for recovery.

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Craig McGraw

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Well do something to cheer it up.

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Bill Eichelberger
NAR 79563

http://wallyum.blogspot.com/

I miss being SAM 0058

Build floor: Centuri Mini Dactyl Estes - Low Boom SST Semroc - Marauder, Shrike, SST Shuttle

In paint: Canaroc Starfighter Scorpion Estes F-22 Air Superiority Fighter, Multi-Roc, Solar Sailer II, Xarconian Cruiser Semroc Cyber III

Ready to fly: Estes - Solar Sailer II Semroc - Earmark, Groonie Der V 1/2

Here is a great little park flier. I have been calling it the Mini Jet #1 for lack of a better name. I built it last year and test flew it on a A3T-4 and man was I supprised. It was gone in a flash with a good streamer deployment and then a gently, twirling, and rolling tumble recovery. Very sweet.

PS: And its not BLUE

James Pierson
NAR #77907

Attached Files

Mini Jet #1.rkt (60.3 KB, 92 views)