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  #1  
Old 01-09-2019, 01:02 AM
Faithwalker Faithwalker is offline
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Default MPC Minirocs brochure

For those who may be interested, the following is a pdf scan of the MPC Minirocs brochure for reference. I've not seen this one posted anywhere else. It is 11" x 17" size format. There is no issue date on it, but I believe this brochure was published sometime around 1971-1972, before the MPC model rocket lines were acquired by Myke Bergenske of AVI. I would be glad to know if anyone has any other knowledge about it and can share with us.

Kind regards,
Jeff Jenkins
aka: Faithwalker
NAR #46879 SR
Attached Files
File Type: pdf MPC_Minirocs_brochure_inside.pdf (1.25 MB, 71 views)
File Type: pdf MPC_Minirocs_brochure_outside.pdf (923.3 KB, 65 views)
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  #2  
Old 01-09-2019, 02:40 PM
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blackshire blackshire is offline
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I am definitely interested, and I thank you for posting this brochure! I like the way that MPC got into the "hows" and "whys" of producing the Minijet motors, and the kits that used them (such as the 36% decrease in frontal drag over a equivalent 19 mm minimum-diameter rockets, the greater strength provided by the smaller, more sharply-curving 13 mm Minijet motor casings, which permitted them to be thinner-walled, etc.). Aesthetically, it is also a beautiful example of commercial art, with its combination of colors, its image framing, and its smooth combination with actual photographs of the Miniroc models. It even has a little "inside baseball"-type information, with its kit carton pricing (I imagine the brochure was intended for model rocket vendors).
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  #3  
Old 01-12-2019, 11:38 AM
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PaulK PaulK is offline
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Cool, thanks for posting!
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  #4  
Old 01-12-2019, 01:01 PM
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LeeR LeeR is offline
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I want a Delta Katt! And some of those B3 motors!
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  #5  
Old 01-12-2019, 01:52 PM
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mojo1986 mojo1986 is offline
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Quote:
Originally Posted by LeeR
I want a Delta Katt! And some of those B3 motors!



Oh yeah, would love to get my hands on some of those 'B' mini engines too!
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  #6  
Old 01-12-2019, 09:29 PM
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Initiator001 Initiator001 is offline
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Quote:
Originally Posted by mojo1986
Oh yeah, would love to get my hands on some of those 'B' mini engines too!


Beware '26 JUL 71' !
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  #7  
Old 01-12-2019, 10:57 PM
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ghrocketman ghrocketman is offline
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I used to have a ton of those B3 minijets and Centuri B4 mini motors.
Never had a problem with any of them.
I still have a few of each.
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  #8  
Old 01-13-2019, 09:11 AM
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Joe Wooten Joe Wooten is offline
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Quote:
Originally Posted by ghrocketman
I used to have a ton of those B3 minijets and Centuri B4 mini motors.
Never had a problem with any of them.
I still have a few of each.


I have a few B4 minis left along with a lot of Centuri A4 and 1/2 A4's. The only problem I ever had with them is that sometimes the ejection charge would not pop and the rocket would try to core sample the asphalt parking lot.....
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  #9  
Old 01-15-2019, 06:01 AM
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blackshire blackshire is offline
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Quote:
Originally Posted by LeeR
I want a Delta Katt! And some of those B3 motors!
I can't help with the 13 mm B3 Minijet motors, but here (see: http://plans.rocketshoppe.com/mpc/m...0/mpc3-0930.htm ) are the Delta Katt plans. Semroc made me some of the 5:1 tangent ogive and the shorter elliptical (for the Pipsqueak) 15 mm diameter nose cones, and Quest sells the 15 mm diameter body tubes (inside which a BT-5 motor mount tube "sleeve-fits" perfectly). Just that slight diameter increase from BT-5 to T15 makes a surprisingly large difference; several of the 15 mm diameter Miniroc kits used 10" parachutes, and the others--including the pop-pod of the Delta Katt--had plenty of room for their recovery streamers! Also:

Centuri, like MPC, at one time offered 13 mm "A" and "B" motors (that's why the motor mount section--the 2-1/2" long #5 [BT-5 size] tube, with a stage coupler thrust ring--of the Centuri Star Trooper [see: http://plans.rocketshoppe.com/centu...M-3/cenKM-3.htm ] is so long, compared with the later, shorter 1-3/4" long Centuri--and Estes--mini motors). If someone would make (or import) such "long" black powder 13 mm "A" and "B" motors today (Quest? Estes? U.S. Rockets? Apogee Rockets [from Sky Model Rockets]?), I think they would be popular.
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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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  #10  
Old 01-15-2019, 06:14 AM
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blackshire blackshire is offline
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Quote:
Originally Posted by Initiator001
Beware '26 JUL 71' !
Those must have been the ones that were stored for years in the semi trailers on the lot, exposed to the alternating heat, cold, humidity, and dry spells... (If a lot of the Minijets from that batch are left, they could be sold as fireworks. :-) ) I wonder--if the existing Estes 13 mm motor casings were treated on the inside with something (a thin, "wicking-in" resin, maybe)--if they could be made in the Minijet lengths and packed to higher "A" and "B" total impulse levels, enabling reliable operation like the (non-temperature-cycled) Minijet motors?
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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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