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I'm trying to locate all the OSIRIS-REx engines.

Here: http://spaceflight101.com/osiris-rex/osiris-rex-spacecraft-overview/ (Propulsion System) I read that there are: 4 x 275 N, 6 x 22 N, 16 x 4.5 N and 2 x 80 mN.
My biggest doubt is about the four 275 N engines.

I'm using the 3D models found here: https://nasa3d.arc.nasa.gov/detail/osirisrex-2013-comp, https://solarsystem.nasa.gov/resources/2360/osiris-rex-3d-model/ and https://sketchfab.com/3d-models/osiris-rex-4502d7705147439eab474902fa283c89.
All the models show the 6-engine group, but I don't see the 4 main engines.

Where are the 4 main engines?

Re-asked question: Where are the 6 22-N OSIRIS-REx engines?

EDIT

Here https://mk0spaceflightnoa02a.kinstacdn.com/wp-content/uploads/2016/08/10.jpg we see 4 main engines. I thought that the spaceflight101.com image was an outdated preliminary image, but it seems that that image is correct and that the 3D models are wrong.

Then I need to change the question: where are the 6 22-N engines?

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  • $\begingroup$ Since your original question was answered, it seems a bit unfair to change it to invalidate the answer. Why not accept the answer and ask a new one? $\endgroup$ – Organic Marble Aug 13 '19 at 11:41
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    $\begingroup$ @Organic Marble done. $\endgroup$ – Cristiano Aug 13 '19 at 15:55
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The second image on your link http://spaceflight101.com/osiris-rex/osiris-rex-spacecraft-overview/ has an element labelled "200 N Thrusters" near the bottom of the image.

enter image description here

The section of that same document that starts "OSIRIS-REx is equipped with four Aerojet Rocketdyne MR-107S thrusters..." has a picture of that thruster and describes them as "installed in a single bank on the base of the spacecraft".

So I think that's them.

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    $\begingroup$ I've added the image to make reading the answer more convenient... $\endgroup$ – Hobbes Aug 12 '19 at 19:46
  • $\begingroup$ The spaceflight101 article linked says there are 4 thrusters, then says “with the 6 engines at nominal thrust...”. The 3D models seem to show six thrusters at that position. I wonder if the design switched between four and six thrusters at some point. $\endgroup$ – Russell Borogove Aug 13 '19 at 15:58
  • $\begingroup$ It seems that the final design is 4 engines, as shown in this photo: mk0spaceflightnoa02a.kinstacdn.com/wp-content/uploads/2016/08/…. $\endgroup$ – Cristiano Aug 13 '19 at 16:01

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