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  #11  
Old 02-07-2018, 07:32 AM
frognbuff frognbuff is offline
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Join Date: Oct 2012
Location: Colorado Springs, CO
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Quote:
Originally Posted by MarkB.
Well, here's what you need:

Balsa Nose Cone #20 6.1" Ogive SEM-BC-2061 1 $9.99
Body Tube #20 18.0" Long SEM-ST-20180 2 $3.79
Body Tube #9 5.0" Long SEM-ST-950 1 $1.29
Centering Ring #9 to #20 (Pkg of 6) SEM-CR-9-20 1 $3.49
Centering Ring - Thrust Ring #9 (6pk) SEM-TR-9 1 $1.99
Ejection Baffle Kit Conical Fiber Series #20 SEM-EB-20 1 $3.99
Engine Hook 3.75" (2pk) SEM-EH-38 1 $1.99
Tubing Coupler #20 2.00" Long SEM-HTC-20 1 $1.79

So $32.11 in Semroc parts. You need parachute, launch lugs and elastic.

I'll do a build thread when the parts come in.


Here's one I did based on BT-50. I opted for no "SS-520-4" decal... Sorry for the display-case photo!
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  #12  
Old 02-07-2018, 04:00 PM
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blackshire blackshire is offline
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Quote:
Originally Posted by frognbuff
Here's one I did based on BT-50. I opted for no "SS-520-4" decal... Sorry for the display-case photo!
Have you considered kitting it? Balsa fins and nose cone would be fine, but 3D printed *or* cast resin fins and nose cone (either hollow-cast "pseudo blow-molded" [even roto-casting it by hand works, see: http://www.ninfinger.org/models/rms...resin_cast.html ], or solid-cast with micro-bulb filler [the screw eye can be "investment cast" into it] would be easy to make), and:

A "3-in-1," builder-customizable kit could be built as either an S-520, an SS-520, or the SS-520-4 or -5 satellite launch vehicles. The SS-520 or SS-520-4/5 model could also have, if the builder desired, a live, spin-stabilized second stage (or a live, spinning second stage with an "inert" third stage, for an SS-520 SLV round model). The second stage would be spun by the canted first stage fins before separation, the second stage's motor would be ignited via gap-staging, and the first stage could be streamer-recovered using Evan "Buzz" Nau's simple gap-staged booster recovery system (it utilizes a rear-ejected motor mount with a vented tube that extends between the first stage and second stage motors [see: http://www.oldrocketforum.com/attac...achmentid=40183 ]).
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  #13  
Old 02-07-2018, 10:52 PM
frognbuff frognbuff is offline
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Quote:
Originally Posted by blackshire
Have you considered kitting it? Balsa fins and nose cone would be fine, but 3D printed *or* cast resin fins and nose cone (either hollow-cast "pseudo blow-molded" [even roto-casting it by hand works, see: http://www.ninfinger.org/models/rms...resin_cast.html ], or solid-cast with micro-bulb filler [the screw eye can be "investment cast" into it] would be easy to make), and:

A "3-in-1," builder-customizable kit could be built as either an S-520, an SS-520, or the SS-520-4 or -5 satellite launch vehicles. The SS-520 or SS-520-4/5 model could also have, if the builder desired, a live, spin-stabilized second stage (or a live, spinning second stage with an "inert" third stage, for an SS-520 SLV round model). The second stage would be spun by the canted first stage fins before separation, the second stage's motor would be ignited via gap-staging, and the first stage could be streamer-recovered using Evan "Buzz" Nau's simple gap-staged booster recovery system (it utilizes a rear-ejected motor mount with a vented tube that extends between the first stage and second stage motors [see: http://www.oldrocketforum.com/attac...achmentid=40183 ]).


All interesting ideas. No, I never considered kitting it. I just don't think the interest would be there. The Lambda-4S is far more visually interesting (IMO), and even it has sold slowly. Then again, I've always pursued a very limited niche market...
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  #14  
Old 02-08-2018, 01:50 AM
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blackshire blackshire is offline
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Quote:
Originally Posted by frognbuff
All interesting ideas. No, I never considered kitting it. I just don't think the interest would be there. The Lambda-4S is far more visually interesting (IMO), and even it has sold slowly. Then again, I've always pursued a very limited niche market...
Thank you. Japan might be a market for it, as they even buy a lot of launch vehicle and spacecraft plastic model kits (the Lambda-4S, H-2, IKAROS, Tenma, Hayabusa, etc.), which--even when depicting U.S. rockets and spacecraft, never sold spectacularly here. Aoshima makes a lot of their plastic kits of launch vehicles and spacecraft. Even paper models of Japanese launch vehicles (some of which are made for optional conversion to model rocket power; some of them are downloadable from websites) are popular there.
__________________
Black Shire--Draft horse in human form, model rocketeer, occasional mystic, and writer, see:
http://www.lulu.com/content/paperba...an-form/8075185
http://www.lulu.com/product/cd/what...of-2%29/6122050
http://www.lulu.com/product/cd/what...of-2%29/6126511
All of my book proceeds go to the Northcote Heavy Horse Centre www.northcotehorses.com.
NAR #54895 SR
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