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maXX_v_bw_o_n (ca. 1960-63 Convair/Gen. Dynamics photo no. 56714)

Convair/General Dynamics artist’s concept of a Mercury-Atlas launch vehicle on the pad. Note the svelte waistline of the Atlas adapter section. To my knowledge, every Mercury-Atlas launch vehicle had a parallel-sided adapter section. Maybe not? Kinda? Sorta? Sometimes?

Unfortunately, and likely due to little else being available, one particular diagram of the “Atlas-Mercury” & Atlas ICBM, printed in “MERCURY ATLAS: MA-6”, an official NASA publication btw, has been replicated/propagated by everybody and their brother. In it, the vehicle does indeed have an obvious waistline. Huh?

A few examples:

 

www.enginehistory.org/Rockets/RPE05/Mercury-Atlas.jpg

Credit: ‘Aircraft Engine Historical Society’ website

 

i1.wp.com/www.drewexmachina.com/wp-content/uploads/2019/0...

Credit: Andrew LePage/Drew ExMachina website

 

Even a version in color:

 

nickd.freehostia.com/OrbiterVault/download/atlas-mr.gif

Credit: ‘Nick’s Space Center’ website

 

Views of MA-1. I must admit, the adapter does appear to minimally narrow near its aft end:

 

i0.wp.com/www.drewexmachina.com/wp-content/uploads/2019/0...

 

i2.wp.com/www.drewexmachina.com/wp-content/uploads/2020/0...

Both above credit: Andrew LePage/Drew ExMachina website

 

upload.wikimedia.org/wikipedia/commons/5/5b/Big_Joe_Ready...

Credit: Wikipedia

 

IDK

 

No artist signature. Used for press release purposes, some highlighted/outlined areas of the photograph remain…permanently. My impressive new handy-dandy remover couldn't budge them.

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Uploaded on September 5, 2021