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  #171  
Old 08-24-2008, 10:47 PM
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Solomoriah Solomoriah is offline
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Quote:
Originally Posted by CPMcGraw
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.

Yeah, I don't have Rocksim but I suspected that a cluster of 3xA10-3T's might have some high DV values on a lot of designs. I'm thinking about making a 3x13mm interchangeable mount for my New Centurion; after all, that's about 3/4 of a C engine, so a big heavy rocket like the NC shouldn't be going too fast when the ejection charges fire.

I'm also considering a 2x13mm X-24 Bug... two A10-3T's ought to work in that sort of rocket. I've already made a 74% downscale entirely from paper which I plan to fly on a single A10-3T. Soon, hopefully.
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  #172  
Old 08-24-2008, 10:56 PM
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Default Magic Number Update

21...

I just noticed my "Lil' Battle Axe" design was missing from the Master List!
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Last edited by CPMcGraw : 08-24-2008 at 11:14 PM. Reason: Another one caught between the cracks...
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  #173  
Old 08-24-2008, 10:59 PM
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Quote:
Originally Posted by Solomoriah
Yeah, I don't have Rocksim but I suspected that a cluster of 3xA10-3T's might have some high DV values on a lot of designs. I'm thinking about making a 3x13mm interchangeable mount for my New Centurion; after all, that's about 3/4 of a C engine, so a big heavy rocket like the NC shouldn't be going too fast when the ejection charges fire.

I'm also considering a 2x13mm X-24 Bug... two A10-3T's ought to work in that sort of rocket. I've already made a 74% downscale entirely from paper which I plan to fly on a single A10-3T. Soon, hopefully.


My Falconaire design uses two 13mm motors...

Lots of work, though.
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  #174  
Old 08-24-2008, 11:00 PM
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Thumbs up Jay weighs in again...

Quote:
Originally Posted by CPMcGraw
Another sport rocket in the "not quite a payloader" camp...

[Tiercel] Should still be a great flyer...

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

This design wins my award for "Most Unusual Use of a BC-760!"


You and James have come up with plenty of eye-catching designs with that cone, so my thanks and congratulations to you both.

Me, all I could manage was "Tau Zero" and "Zeta."


Cheers,
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  #175  
Old 08-24-2008, 11:05 PM
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Quote:
Originally Posted by James Pierson
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...


Looks good, JP. ST-13 sized, and still gets 300+ altitude...

Now, wrangle up an ST-18 design, something simple will do, using a single 13mm, capable of ~125' with a low Dv. Streamer recovery is acceptable. The idea is to create a rocket that can be flown in almost any small yard, but still be larger than the typical stuff Estes puts out for 13mm. Like a Lionel train in young hands...
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  #176  
Old 08-24-2008, 11:10 PM
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Quote:
Originally Posted by CenturiGuy
Craig,

This design wins my award for "Most Unusual Use of a BC-760!" ...


Thanks, Jay. It's actually the second design where I've used the 760 in this way, but I can't remember the name of the other one right off hand...

Addendum: Found it! It was the Non Aspera. Used a clear CPT-7 tube for dramatic effect...
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Last edited by CPMcGraw : 08-25-2008 at 12:08 AM.
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  #177  
Old 08-25-2008, 12:35 AM
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Exclamation New ST-18 Design -- Brutus

Quote:
Originally Posted by CPMcGraw
Now, wrangle up an ST-18 design, something simple will do, using a single 13mm, capable of ~125' with a low Dv. Streamer recovery is acceptable.
Okay, here you go, Craig.

So much for 27 fps qualifying as "low Dv" (probably not, but I gave it my best shot).

I started out with a 9" long tube and a BC-1828, and kept adding nose weight (even an SE-14 and some WL-7 nose weights during the process), but that didn't really help things.


This basically ended up looking like a slightly more brutal Big Bertha variant, so I called him "Brutus."


.
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  #178  
Old 08-25-2008, 03:02 AM
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Quote:
Originally Posted by CenturiGuy
...So much for 27 fps qualifying as "low Dv" (probably not, but I gave it my best shot).


Notice the 'optimal delay' time? 2.09 seconds. On a 3-second delay, it is falling for half as much time as it is coasting upward. That's why the Dv is high.

Good shot, Jay. You (nearly) met all of the parameters of the challenge. I'll include it in the list, but we need to tweak it a bit to get that Dv down below 20. Even a streamer becomes a screamer at some point...

Addendum: I think I'll just build one and see what screams - the model, or me...


Magic Number is now 20...
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Last edited by CPMcGraw : 08-25-2008 at 02:33 PM.
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  #179  
Old 08-26-2008, 12:01 AM
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Solomoriah Solomoriah is offline
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Hmm. As I said, I don't have Rocksim, but I do have a hunch.

Start with an Estes Patriot; remove all the body tubes and couplers, swapping in a Baby Bertha style 7.5" long BT-60 tube. Install a 13mm engine mount, and see what the DV is with an A10-3T.

I have a hunch it will be low. Admittedly, my hunch is based on notes I took when I played with the Baby Bertha and Patriot parts last year while still trying out Rocksim. But I never tried it with a 13mm mount and A10-3T, so I'm just guessing...

Every time I have a hundred bucks to spend on rocketry, I think "Rocksim or a big bunch of parts?" and the big box of parts wins every time.
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  #180  
Old 08-26-2008, 11:10 PM
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Thumbs up New Design -- Guerrero

I've had the name "Guerrero" (which is Spanish for "Warrior") as a possible name for a rocket for several years now, but hadn't come up with a design that the name really fit.

Until now.


I was watching the 4th season of "Babylon 5" last night, and noticed some cool ships based on the number 5. (See picture #1 below.) I was able to identify them as "Drakh raiders."

One thing led to another (1982 "Fixx" reference), and tonight I bring you my sick and twisted B5-inspired model rocket adaption entitled... "Guerrero."


(And yes, I'll have to piece the fins together... Maybe from 1/16" balsa with the grain running in appropriate directions, and then a second layer oriented "crossways," topped off with computer label paper on the outside.)


Have fun, kids!


.
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03 Sept 2014
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