Ye Olde Rocket Forum

Go Back   Ye Olde Rocket Forum > Semroc > SAM - Semroc Astronautic Modeler Team
User Name
Password
Auctions Register FAQ Members List Calendar Today's Posts Search Mark Forums Read


Reply
 
Thread Tools Search this Thread Display Modes
  #1  
Old 01-12-2011, 02:40 AM
blackshire's Avatar
blackshire blackshire is offline
Master Modeler
 
Join Date: Jan 2009
Location: Fairbanks, Alaska
Posts: 6,507
Default Old Semroc Docs. (2)

Hello All,

Today I received a set of all of the issues of "The Rocketeer Collector's Journal" (RCJ) from Danny Sagstetter. Volume 1, Numbers 9 and 10 (the January 1997 and April 1997 issues) of RCJ contain re-prints of old Semroc Astronautics catalogs (including the Volume 1, Number 1 [March 1970] issue of the Semroc "Astronautic Modeler"). These contain the recommended motors lists (which include the unusual "3/4B" and "3/4C" motors) for Semroc's "first era" model rocket kits, "Retro-Repro" reproductions of most of which are available from Semroc today. These recommended motors lists are reproduced below. Also:

I noticed that the lengths and fin spans given for the original Semroc model rocket kits differ somewhat from those of today's "Retro-Repro" reproductions of those same kits. The specifications for the original kits, which can also be found in the online scan of the Volume 1, Number 2 [May 1970] issue of Semroc's "Astronautic Modeler" (see: http://www.ninfinger.org/rockets/ca...570semroc8.html ), are reproduced below (under the original Semroc kits' recommended motors lists), along with the lengths and fin spans (given in parentheses) of today's Semroc "Retro-Repro" model rocket kits. (I've included these *not* as a criticism against Semroc, but simply for historical research purposes).

I have reproduced the original recommended motors lists (and the predicted altitudes, where given) from the old Semroc catalogs so that SAMs can get a better "feel" for the performance capabilities of the unusual motors. (Incidentally, the decor schemes depicted on the Semroc rockets in these catalogs are quite handsome--Carl should include decals for them in the "Retro-Repro" Semroc kits!) Here are the recommended motors lists and the predicted altitudes, followed by the original vs. "Retro-Repro" kits' specifications:


Semroc "Goliath" (cluster model)

Recommended Motors (3 required per flight)

A8-3
3/4B6-3
B6-4
3/4C6-4
C6-5

Expected Altitudes for "Goliath" (dependent on surface finish)

A8............300' - 350'
3/4B6........500' - 600'
B6............625' - 800'
3/4C6.......850' - 1100'
C6..........1100' - 1400'


Semroc "Aphelion" (beginners' sport model)

Recommended Motors

1/2A6-2
A8-3
3/4B6-3
3/4C6-4
B6-4
C6-5

Expected Altitudes for "Aphelion" (dependent on surface finish)

1/2A6........55' - 70'
A8...........210' - 240'
3/4B6.......350' - 400'
B6...........450' - 500'
3/4C6......700' - 900'
C6.........1000' - 1200'


Semroc "XK-23" (sport model with experimental "eject-muffler" [ejection baffle])

Recommended Motors

1/2A6-2
A8-3
3/4B6-3
3/4C6-4
B6-4
C6-5

Expected Altitudes for "XK-23" (dependent on surface finish)

1/2A6.........55' - 70'
A8............210' - 240'
3/4B6........330' - 400'
B6............500' - 600'
3/4C6.......700' - 930'
C6...........950' - 1200'


Semroc "Lune R-1" (large payload model)

Recommended Motors

A8-3
A4-4 (Possibly a typographical error? Perhaps B6-4 was intended instead?)
3/4B6-3
3/4C6-4
B6-4
C6-5

Expected Altitudes for "Lune R-1" (dependent on surface finish)

1/2A6.........55' - 70'
A8............210' - 240'
3/4B6........350' - 400'
B6............450' - 500'
3/4C6.......700' - 900'
C6..........1000' - 1200'


Semroc "Swift" (minimum-diameter beginners' model)

Recommended Motors

A8-3
A8-5
3/4B6-5
3/4C6-6
B6-6
C6-7

Expected Altitudes for "Swift" (dependent on surface finish)

1/2A6........200' - 250'
A8............450' - 600'
3/4B6........600' - 950'
B6............750' - 1200'
3/4C6......1000' - 1750'
C6..........1250' - 2100'


Semroc "Sigma II" (two-stage model)

Recommended Motors (booster motors in left column, sustainer motors in right column)

1/2A6-0.........1/2A6-4
A8-0.............A8-5
3/4B6-0.........3/4B6-5
B6-0.............B6-6
3/4C6-0........3/4C6-6
C6-0.............C6-7


Semroc "Black Brant III" (scale model)

Recommended Motors

1/2A6-2
A8-3
3/4B6-3
3/4C6-4
B6-4
C6-5



ORIGINAL VERSUS "RETRO-REPRO" SEMROC KITS' LENGTHS AND FIN SPANS:


"Goliath": Length: 23.2" (23.9" today), Fin Span: 7.00" (7.0" today)

"Aphelion": Length: 16.0" (14.8" today), Fin Span: 4.50" (4.5" today)

"XK-23": Length: 16.1" (16.1" today), Fin Span: 4.9" (4.9" today)

"Lune R-1": Length: 23.6" (23.3" today), Fin Span: 3.70" (4.0" today)

"Swift": Length: 12.5" (12.0" today), Fin Span: 3.25" (3.2" today)

"Triton": Length: 5.75" (5.4" today), Fin Span: 3" (2.9" today)

"Hydra VII": Length: 32" (30.5" today), Fin Span: 8" (6.9" today)

"Black Brant III": Length: 21.7" (N/A), Fin Span: 3.44" (N/A) [NOT YET AVAILABLE AS A "RETRO-REPRO" KIT]

"Sigma II": Length: 15.0" (N/A), Fin Span: 7.00" (N/A) [NOT YET AVAILABLE AS A "RETRO-REPRO" KIT]


I hope this information will be useful.


-- Jason
__________________
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

Last edited by blackshire : 01-12-2011 at 03:28 AM. Reason: This ol' hoss done forgot somethin'.
Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump



All times are GMT -5. The time now is 04:54 AM.


Powered by: vBulletin Version 3.0.7
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Ye Olde Rocket Shoppe © 1998-2024