Perhaps there are reasons I'm unaware of, but why not consider strapping to frames instead of D-rings? Wouldn't that disperse the pull strength on multiple(4 or more) D-rings? Granted, lots of variables. Type of vessel. How are you pinned. How high does your boat sit. Would pulling on frame risk flipping vessel. Cat frames have possible low level attachment points vs raft frame that just sits on top. Etc etc. Overall, I would prefer to not get stuck at all, but in the instances where it's inevitable I would not rule out attaching to frames as a tool in the bag of tricks.
If you tie only to the frame you'll rearrange the frame before pulling on the boat. Also the frame is attached with cam straps that have low breaking strength. Some times I'll do a 3 point anchor with 2 d-rings and 1 frame attachment.
Been watching lots of your videos and enjoying learning about whitewater things. Been on a good handful of guided trips as paddler with friends including a few times on the Upper Gauley fest. But now am considering running things myself particularly rowing catarafts, being more sports car. As an engineer, sailor and rock climber, am liking the science of hydrodynamics and boat mechanics involved with other things I know coming together into a different recipe for whitewater. What mode of failure is most likely in a D ring failure? Does it rip through the material containing it or does the patch come off? AFAIK, manufacturer D rings are usually glued on patches rather than woven in to the material, but also that proper gluing is a very strong chemical bond and standard method. Do you find a shear force such as for attaching frames vs a normal force as in pulling from shore can be handled more by bonded patches and their D rings?
Great video! D rings are definitely the x factor. Say, I noticed that you have the people pulling on the Z-drag downstream of the system. I remember learning that we should always be upstream of these systems. The thinking was that if anything went wrong or changed (like you start to get the boat moving off a rock), the people pulling can always just drop the rope and not have to worry about getting tangled up in the system. Is that still the thinking or are people changing the thinking on that? Any thoughts?
Yes normally you want to be upstream of the rope. In that example we couldn't get upstream of the rope and there was no chance the rope would hit us after it came off.
Excellent point on D ring strength
Great video
Thanks for watching!
Perhaps there are reasons I'm unaware of, but why not consider strapping to frames instead of D-rings? Wouldn't that disperse the pull strength on multiple(4 or more) D-rings? Granted, lots of variables. Type of vessel. How are you pinned. How high does your boat sit. Would pulling on frame risk flipping vessel. Cat frames have possible low level attachment points vs raft frame that just sits on top. Etc etc. Overall, I would prefer to not get stuck at all, but in the instances where it's inevitable I would not rule out attaching to frames as a tool in the bag of tricks.
If you tie only to the frame you'll rearrange the frame before pulling on the boat. Also the frame is attached with cam straps that have low breaking strength. Some times I'll do a 3 point anchor with 2 d-rings and 1 frame attachment.
Been watching lots of your videos and enjoying learning about whitewater things. Been on a good handful of guided trips as paddler with friends including a few times on the Upper Gauley fest. But now am considering running things myself particularly rowing catarafts, being more sports car. As an engineer, sailor and rock climber, am liking the science of hydrodynamics and boat mechanics involved with other things I know coming together into a different recipe for whitewater.
What mode of failure is most likely in a D ring failure? Does it rip through the material containing it or does the patch come off?
AFAIK, manufacturer D rings are usually glued on patches rather than woven in to the material, but also that proper gluing is a very strong chemical bond and standard method. Do you find a shear force such as for attaching frames vs a normal force as in pulling from shore can be handled more by bonded patches and their D rings?
It depends on the fabric. Usually it rips through the fabric before the hole d-ring comes off.
Great video! D rings are definitely the x factor. Say, I noticed that you have the people pulling on the Z-drag downstream of the system. I remember learning that we should always be upstream of these systems. The thinking was that if anything went wrong or changed (like you start to get the boat moving off a rock), the people pulling can always just drop the rope and not have to worry about getting tangled up in the system. Is that still the thinking or are people changing the thinking on that? Any thoughts?
Yes normally you want to be upstream of the rope. In that example we couldn't get upstream of the rope and there was no chance the rope would hit us after it came off.