How exactly were solid-fuel rockets added to the parachute lines of the Voskhod capsule?

Question

This answer notes that Voskhod:

...added a small solid-fuel rocket to the parachute lines. It fired as the descent module neared touchdown, providing a softer landing.

How exactly did they safely and reliably add a "solid-fuel rocket to the parachute lines"? I'm thinking that the rocket's exhaust could burn and sever the line directly below, defeating the purpose.

Rockets pulling on lines have long been a thing. Check out the unbelievable Stanley Yankee ejection system. https://youtu.be/8Yw8g1Soigk?t=45 — Organic Marble, Jun 17 '19 at 00:17
An engineer from Stanley gave a presentation to our aerospace engineering society when I was in college. I've never forgotten it! — Organic Marble, Jun 17 '19 at 00:42

Russell Borogove · Accepted Answer · 2019-06-17T19:30:33.303

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I found a diagram that explains it better than words. The landing rocket module was at the base of the parachute lines, not above them:

The linkage appears to be hinged, but I'm guessing it's a solid piece of metal rather than easily-burned fiber.

According to Space Biology & Medicine: Space and its Exploration, the capsule would be falling at 7-8 m/s (~25 fps) on the parachutes, and the rocket would slow it to 3-5 m/s (~13 fps), so impact would have been survivable, if not pleasant, if the rockets didn't activate for any reason.

edited Jun 17 '19 at 19:30

answered Jun 17 '19 at 00:40

Russell Borogove

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Great diagram!! – Organic Marble Jun 17 '19 at 00:44
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"Mechanical altimeter" - So a stick that pokes into the ground? – Markus Appel Jun 17 '19 at 10:08
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Hey, it was good enough for the Apollo LM... – Russell Borogove Jun 17 '19 at 10:56
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@MarkusAppel Presumably. But, being certified for space flight, it would have been a very expensive stick. – David Richerby Jun 17 '19 at 14:55
What would have happened to the mechanical altimeter if the landing spot was not solid ground but a small lake? But the possibility of hitting water in the desert was very low. – Uwe Jun 17 '19 at 15:00
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Hopefully any surface soft enough to avoid triggering the altimeter would be soft enough to safely land on without the rockets. – Russell Borogove Jun 17 '19 at 15:23

How exactly were solid-fuel rockets added to the parachute lines of the Voskhod capsule?

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