Question MRS DdRT vs. SRS SRT

So far I would say we are at 10

Difference​
1.
Elongation​
2.
Mechanical Advantage​
3.
Setting the Tie-In-Point​
4.
System configuration​
5.
Ropes used​
6.
Friction variables​
7.
Equipment required​
8.
More or less variables​
9.
Difficulty in use.
10.
Vertical movement and lateral movement.​
 
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Richard Mumford-yoyoman said:
I would like to compile a list of differences that climbers understand between MRS DdRT and SRS SRT and if you are brave, a rope that is doubled over but not moving.
Not a test and there is no one correct answer or prize. (Well ok, the 17th real response, (you are lucky I didn't pick my age for that number), will get a free Footie from Climbing Innovations LLC)

Thanks
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He said there is no prize?
 
Mowerr said:
Otherwise I could win but Richard said there is no prize
Click to expand...
Did I lie? Anyway, on the "17th real response" there will be a free Footie from Climbing Innovations LLC.
At this point I'm counting 10 real responses, differences between the systems. Of course we can always debate that as what would any thread be without some spirited debate. Maybe I'll have to give away more than 1 Footie. I would do a SAKA but I'm out of stock.
 
HigherGroundArborist said:
Did someone mention tie in point forces? I thought it was mentioned but don’t see it on the list of 10. SRS with basal anchor doubles forces on the tie in point.
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Let me throw this out there.
Base anchor forces are really a subset of SRT, correct? But because it is seldom if ever used in DdRT or MRS I think that would be a fair addition but can a crazy person actually base anchor a moving rope? I think so and perhaps there could be a reason for it. I know that is getting picky technical but that's what this is about, understanding exactly what they are.
 
Richard Mumford-yoyoman said:
Let me throw this out there.
Base anchor forces are really a subset of SRT, correct? But because it is seldom if ever used in DdRT or MRS I think that would be a fair addition but can a crazy person actually base anchor a moving rope? I think so and perhaps there could be a reason for it. I know that is getting picky technical but that's what this is about, understanding exactly what they are.
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There can be a base anchor for moving rope if you are using pulleys for mechanical advantage. I’ve done this with my kids to help them climb.
 
I am devoted to SRT. But, there is a caution with SRT that is not an issue with DdRT and not often discussed. I've posted it before and, FWIW, deserves to be mentioned again:
Since SRT rope does not move up & down during work like DdRT, the SRT rope can be damaged if the same spot on the rope is allowed to continually rub back & forth over a branch while working. Many years ago, I rubbed through the cover of an SRT line in an abrasive Black Oak. A new rope was abraded by repeated contact with a branch, just below the TIP, during an extended dead-wooding job. It's easier than you think to ruin a good rope this way — especially a kern-mantle rope
LESSON LEARNED.
So, take care on how the rope threads through the tree when using SRT.
 
So my counting may have been confusing on how we get to 17 and we are at #32 posts now so let me changes the rules a little. Everyone that has contributed so far, up to this post, if you want a free footie, send me TreeBuzz email, tell me your post number and I will send you a free Footie. I will of course need your address.
In the mean time, please continue. There will be another free Footie and I will decide what answer gets it.
 
In SRS you and the device move on the rope, whereas in MRS you and the device move with the rope.

SRS is much much more agreeable to multiple redirects, and not building of extra friction on the rope without extra gear (think twin shiv pulleys and slings, vs natural crotches)

SRS is easier to protect from rope damage due to sharp edges (think tying in over the ridge of a roof for storm damaged trees. A rope sleeve protector can be used on srs practically, but can't be used reliably on MRS)

SRS requires the same amount of cordage as MRS if retrieval is taken into account, however in SRS only ~half the length has to be rated for life support

MRS is the only rope system currently usable for rigging loads. There are ways of using SRS like rock climbers who rappel with a figure 8, however they require someone riding with the rigged piece to control it, or someone running the tail end in the drop zone.

SRS is the only rigging method usable for speedlines (though you can add a MRS control line).

MRS is mostly confined to use in the arborist industry, as most other industries, roofing, rope access, caving, rescue predominantly use SRS for life support and MRS for rescue

Most (if not all) SRS gear can be used both SRS and MRS, whereas MRS gear usually requires some device to add additional friction to the system (munter below the hitch, wrench above the hitch, or a purpose built device with increased friciton rope runner/petzl id/etc)

You can "easily" set 2 climbing sytems from the ground with 1 rope in SRS using less rope than you can with MRS. Shared anchor point only needs 1 retrieval line and 2 rated parts of rope for SRS vs 4 rated parts of rope for MRS. Though this may be more of a concern for the european folks and their 2 climbing system requirement. You can see an example of the 2 SRS systems in the video here

That's most of the ones I can think of there's some difference when it comes to rescue, but most of those are more setup dependent rather than climbing style differences and don't translate to text very well
 
theatertech87 said:
In SRS you and the device move on the rope, whereas in MRS you and the device move with the rope.

SRS is much much more agreeable to multiple redirects, and not building of extra friction on the rope without extra gear (think twin shiv pulleys and slings, vs natural crotches)

SRS is easier to protect from rope damage due to sharp edges (think tying in over the ridge of a roof for storm damaged trees. A rope sleeve protector can be used on srs practically, but can't be used reliably on MRS)

SRS requires the same amount of cordage as MRS if retrieval is taken into account, however in SRS only ~half the length has to be rated for life support

MRS is the only rope system currently usable for rigging loads. There are ways of using SRS like rock climbers who rappel with a figure 8, however they require someone riding with the rigged piece to control it, or someone running the tail end in the drop zone.

SRS is the only rigging method usable for speedlines (though you can add a MRS control line).

MRS is mostly confined to use in the arborist industry, as most other industries, roofing, rope access, caving, rescue predominantly use SRS for life support and MRS for rescue

Most (if not all) SRS gear can be used both SRS and MRS, whereas MRS gear usually requires some device to add additional friction to the system (munter below the hitch, wrench above the hitch, or a purpose built device with increased friciton rope runner/petzl id/etc)

You can "easily" set 2 climbing sytems from the ground with 1 rope in SRS using less rope than you can with MRS. Shared anchor point only needs 1 retrieval line and 2 rated parts of rope for SRS vs 4 rated parts of rope for MRS. Though this may be more of a concern for the european folks and their 2 climbing system requirement. You can see an example of the 2 SRS systems in the video here

That's most of the ones I can think of there's some difference when it comes to rescue, but most of those are more setup dependent rather than climbing style differences and don't translate to text very well
Click to expand...
I will work on adding those, some I think were covered so next pdf, please take a look and see if I missed any.
Thank you!
 
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