Another sport rocket in the "not quite a payloader" camp...

Should still be a great flyer...

Length: 24.70"
Diameter: 1.04" (ST-10)
Fin Span: 3.04"
Weight: 1.63 oz

A8-3......160'......Dv 12 FPS......36" x 1/8" rod
B4-4......400'......Dv 3 FPS.......36" x 1/8" rod
B6-4......410'......Dv 4 FPS.......36" x 1/8" rod
C6-5......900'......Dv 6 FPS.......36" x 1/8" rod

Enjoy!

Magic Number now at 26...

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Tiercel.rkt (72.9 KB, 107 views)

__________________
Craig McGraw

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SAM 0044
AMA 352635

Long-body sport rocket, could be dressed up with goo-gahs and other breakable bits to become something really fantasy-oriented. I'm just presenting a flyable foundation here.

Length: 39.95"
Diameter: 1.84" (ST-18 shrouds)
Fin Span: 3.76"
Weight: 1.72 oz

A8-3.......160'......Dv 11 FPS......48" x 3/16" rod
B4-4.......420'......Dv 6 FPS.......36" x 1/8" rod
B6-4.......430'......Dv 11 FPS......36" x 1/8" rod
C6-5......1000'......Dv 24 FPS......36" x 1/8" rod (reefed chute)

Enjoy!

Magic Number now at 25...

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Mojo Rodja.rkt (68.4 KB, 84 views)

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Craig McGraw

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SAM 0044
AMA 352635

I think this one has some pleasing lines, in a classic arrangement borrowing from the Laser-X, the Taurus, and several BARCLONEs. Performance appears to be good on the common four motors, but you might need a 48" rod if you choose to use the A8-3. It only requires 34", but you don't really have the full 36" to start with on a traditional pad. The plans call out a 3/16" launch lug so you can use any standard 36" x 1/8", or 'maxi' 48" x 3/16" launch rod.

Length: 29.45"
Diameter: 1.34" (ST-13)
Fin Span: 6.34"
Weight: 1.74 oz

A8-3......155'......Dv 13 FPS
B4-4......400'......Dv 3 FPS
B6-4......410'......Dv 7 FPS
C6-5......940'......Dv 15 FPS

Enjoy!

Magic Number now at 24...

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Capricorn Alpha.rkt (73.9 KB, 81 views)

__________________
Craig McGraw

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SAM 0044
AMA 352635

Here's a file for anyone wanting to use the 'Recruiter' nose cone in their projects. It's a composite element, made up of six segments. Because this is intended to be a 'nose cone', it cannot be saved as a 'Subassembly'.

Addendum: RockSim says the weight of the nose cone is 0.096 oz, and the SEMROC website shows it as 0.12 oz. Not bad!

Enjoy!

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BC-838.rkt (16.8 KB, 79 views)

__________________
Craig McGraw

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SAM 0044
AMA 352635

CPMcGraw Quote:


Sometimes Craig and I think so much alike, it scares me. . Here is my guess-timated version of an BC1038 from Semroc in the design below.


This following design that is showing my re-think of the 13mm powered designs. I call this design the Sky-Jack and it uses both my favorite tube the ST10 and nose cone the BC-1038. I would not be afraid to fly this design on an 1/2A3T-4 in a schoolyard or front yard. With the altitude predicted by Rocksim with the A3T-4 I would stick to a good size launch field.

Enjoy and Thanks Again, JP

James Pierson
NAR# 77907

Sky-Jack (13mm)
Launch guide length: 36.0000 In

MOTOR.................MAX. ALTITUDE...........DEP. VELOCITY
1/2A3T-4..............232.13484 Ft............22.3026 ft/s
A3T-4.................527.64436 Ft............10.4633 ft/s
.

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Sky-Jack.rkt (51.6 KB, 98 views)

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Craig McGraw

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SAM 0044
AMA 352635

Hey, I haven't had time to dig back through all these posts... have any of you ever designed a rocket to fly on 3x13mm, specifically A10-3T? I may have a big pile of them soon, and I think such a rocket would be a cool way to use them.

__________________
NAR # 115523
Once upon a better day... SAM #0076
My site: http://rocketry.gonnerman.org

THose of you that know NIRA member Adam Elliott know he is hard of hearing. Someone was flying a G80 and he heard "D80" and asked "What's that?"

Then he built one. It's a BT-70 rocket with a cluster of EIGHT A10-3Ts which adds up to a D80. It's a really cool rocket to see fly; lots of fire and smoke.

Say, maybe something like a 135% Cobra with 8x13 instead of 3x24mm MMT?

Talk about like minds thinking alike!

Look at the Goony Cobra. 239' altitude, with a Dv of only 3 FPS, and flies off a 36" x 1/8" rod. Not an upscale, but a downscale, and slightly Goony to boot!

Addendum: OOPS! I didn't remember (or notice) this until after I posted the above. Goony Cobra only uses one A10-3T. A cluster of three produces a shredder with a Dv over 35 FPS.

__________________
Craig McGraw

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SAM 0044
AMA 352635

13mm Design Challenge ... At least for me.

Here is an 13mm design using an ST-1380 main body tube that seems to fly on three of the four 13mm motor choices. Most 13mm designs will usually fly on only two of the four motors with acceptable Dv's. I do not know of an 13mm design, using an parachute recovery, that uses all four ( 1/4A3T-3, 1/2A3T-2, A10T-3, A3T-4) motors with DV's below 20fps. his could be an design challenge worthy of spending some time on. All in all, the Lil' Star Smasher design should be an all around good flier.

Enjoy and Thanks Again, JP

James Pierson
NAR# 77907

Lil' Star Smasher (13mm)
Launch guide length: 36.0000 In

MOTOR.................MAX. ALTITUDE...........DEP. VELOCITY
1/2A3T-2..............132.94783 Ft.............18.1665 ft/s
A10T-3................336.71260 Ft.............15.2575 ft/s
A3T-4.................349.07152 Ft.............12.3443 ft/s

.

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Lil' Star Smasher.rkt (51.3 KB, 78 views)