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-   -   What's the best rope? (http://www.chiefdelphi.com/forums/showthread.php?t=153125)

andrewytiger 09-01-2017 00:47

Re: What's the best rope?
 
Quote:

Originally Posted by engunneer (Post 1626838)
As an inspector, that rope would not pass my inspection and would be brought to the LRI as it contains glass beads (which are not fibers or flexible, per I04).

As an inspector, do you believe that velcro would be allowed?

frcguy 09-01-2017 00:50

Quote:

Originally Posted by Steph342 (Post 1627423)
Is there anything preventing you from using a nylon strap and a drum with barb wire to suck in the rope and winch yourself up?


Just why...

Cothron Theiss 09-01-2017 01:31

Re: What's the best rope?
 
Quote:

Originally Posted by frcguy (Post 1627635)
Just why...

Because who needs skin on their hands?

engunneer 09-01-2017 07:03

Re: What's the best rope?
 
Quote:

Originally Posted by andrewytiger (Post 1627633)
As an inspector, do you believe that velcro would be allowed?

My team asked me that too. I need to look more closely at the construction of the loop half. I think I need the hook half is likely to be a no (75% confidence) and the loop half could be a yes, but possibly only certain brands if all the backing is woven. I'm 50/50 on that until I can look at it closely or the gdc rules.

SpadeSeveren 12-01-2017 11:24

Re: What's the best rope?
 
Quote:

Originally Posted by ToddF (Post 1627142)
Design your winch so it unreels (slowly) when the match is over.

Or you could just take the rope off of the airship, then remove the rope from the robot. I feel like that would be much easier.

GeeTwo 12-01-2017 11:29

Re: What's the best rope?
 
Quote:

Originally Posted by Maxwellfire (Post 1627160)
The only question is whether you can tie a large enough knot in the end to satisfy the > 1" requirement at the top.

Google "Monkeys Fist Knot". You can start with an overhand knot and add larger and larger monkey's fists around them.

Chief Hedgehog 12-01-2017 11:40

Re: What's the best rope?
 
Quote:

Originally Posted by Steph342 (Post 1627423)
Is there anything preventing you from using a nylon strap and a drum with barb wire to suck in the rope and winch yourself up?

I like out of the box ideas and I am not trying to be mean, but...

The scary thing about Chief Delphi is that some of these ideas become a reality.

If that thing WAS allowed on the field, the other robots would find the nearest corner and attempt to wet themselves.

Eric Scheuing 12-01-2017 12:28

Re: What's the best rope?
 
Quote:

Originally Posted by andrewytiger (Post 1627633)
As an inspector, do you believe that velcro would be allowed?

There are at least 3 questions on the Q&A regarding velcro. Just keep watching for answers.

engunneer 12-01-2017 14:29

Re: What's the best rope?
 
Thanks to FRC1339 we have a final answer on glass beads.
https://frc-qa.firstinspires.org/qa/51

I still think the linked rope does not actually contain glass beads after reading the manufacturer's website, but a theoretical rope containing glass beads is not legal.

mwmac 12-01-2017 15:53

Re: What's the best rope?
 
Quote:

Originally Posted by engunneer (Post 1630091)
Thanks to FRC1339 we have a final answer on glass beads.
https://frc-qa.firstinspires.org/qa/51

I still think the linked rope does not actually contain glass beads after reading the manufacturer's website, but a theoretical rope containing glass beads is not legal.

After speaking with representatives of Pigeon Mountain Industries, (manufacturer of the retro-reflective rescue rope), I believe neither the question that was asked nor the answer given really settle the issue. IMO, microscopic beads of glass contained entirely within an individual nylon fiber which is then woven into the rope sheath covering the rescue rope clearly does not render the nylon fiber any less a fiber nor inflexible. Just my two cents. Careful wording of questions in Q&A is paramount.

Chris is me 12-01-2017 16:03

Re: What's the best rope?
 
Quote:

Originally Posted by GeeTwo (Post 1626919)
Velcro is not composed of twisted or braided strands, unless you consider individual polymer molecules strands and are looking at it under a really good microscope. Feel free to ask on Q&A, but this seems like a pretty solid no to me.

You omitted the verbiage of the rule that makes Velcro legal from your definition, specifically "woven". Loop-side Velcro consists of very thin strands woven together, sometimes with a fabric backing that is also woven. Sometimes the backing and the Velcro loops are even interwoven! This means certain strips of Velcro clearly meet the rules as written. I suspect the rules will probably be changed to add a Velcro exception so that we don't all just have winches made of Velcro that can be designed in five minutes, but as of now it doesn't seem very ambiguous.

engunneer 12-01-2017 17:06

Re: What's the best rope?
 
Quote:

Originally Posted by mwmac (Post 1630128)
After speaking with representatives of Pigeon Mountain Industries, (manufacturer of the retro-reflective rescue rope), I believe neither the question that was asked nor the answer given really settle the issue. IMO, microscopic beads of glass contained entirely within an individual nylon fiber which is then woven into the rope sheath covering the rescue rope clearly does not render the nylon fiber any less a fiber nor inflexible. Just my two cents. Careful wording of questions in Q&A is paramount.

correct, the beads don't make the nylon less flexible or less fiber. however the beads themselves are neither flexible, nor fiber, and as such, disqualify the whole rope.

mwmac 12-01-2017 17:16

Re: What's the best rope?
 
Quote:

Originally Posted by engunneer (Post 1630170)
correct, the beads don't make the nylon less flexible or less fiber. however the beads themselves are neither flexible, nor fiber, and as such, disqualify the whole rope.

Not wanting to lawyer this anymore but one question: is the dye used to color the nylon a fiber or flexible?


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