qustion

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(Jomoco) Hey Treeco, wasn't Dar Robinson the dude that got blown out the upper floor window by Burt Reynolds in Sharky's Machine?

That was one helluva stunt!

jomoco

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(Blinky)Not sure if it was Dar Robinson but it was indeed a helluva a stunt.

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I do believe that was Dar! He was looking up as he was falling and shooting. Now that's what you call just plain mean! I saw a special on the stunt work of Dar Robinson and they showed close ups of the gear used to do the dynamic breaking. Dar had a hand in the design and was the stunt man in the movie.
 
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Rapid slack removal is demonstrated in the new GRCS video.

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This is a technique we use often. It works well.

It is also one more point as to why I would prefer the GRCS.
 
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The preload in the rope might some what go away, but, it will release it's enregy into the log being pulled over, in turn making it come off much faster than just pushing it off. This makes the short distance you are tring to obtain the same as if it was not preloaded.


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With all due respect Hollenreich I disagree with your last sentence above.

A preloaded rope will result in a shorter fall distance, but it's just like GB said the shock load will be greater, and the climber and rope at greater risk. I've taken a few rides under those conditions and it was pretty rough and not much fun. But when the target is close and the wood fat and wet, the options are limited when there's no crane access and targets surround you.

This is the reason that some situations pretty much demand bigger ropes and blocks unless you just admit defeat and walk away, and I don't like doing that.

jomoco
 
Pulling slack on a hobbs or grcs is not difficult to master. It just takes the right pull at the right time. It's a very narrow window. Being ready to let it run a little after snatching out the slack takes a little more practice.

What I see as being useful would be to be able to have 150 or so pounds of pre tension applied and when the slack hits the system to have a spring that would keep the 150lbs of pre tension remaining in the system. Of course as soon as the load pulls tight it's time to let it run if there is room below. This is what I though Jomoco was talking about.

If the bollard were to make a racheting sound as the spring rotated it taking up tension it would be a great audible clue to the rope person. As soon as the spring stopped pulling rope and the racheting sound stopped it would then be time to let it run if room allowed.
 
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Pulling slack on a hobbs or grcs is not difficult to master. It just takes the right pull at the right time. It's a very narrow window. Being ready to let it run a little after snatching out the slack takes a little more practice.

What I see as being useful would be to be able to have 150 or so pounds of pre tension applied and when the slack hits the system to have a spring that would keep the 150lbs of pre tension remaining in the system. Of course as soon as the load pulls tight it's time to let it run if there is room below. This is what I though Jomoco was talking about.

If the bollard were to make a racheting sound as the spring took up tension it would be a great audible clue to the rope person. As soon as the spring stopped pulling rope and the racheting sound stopped it would then be time to let it run if room allowed.

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An excellent observation Treeco.

My original thoughts on the usefulness of rotary spring motors was for automobiles and semi trucks, specificly in augmenting their braking systems to bind them, then releasing that force to augment getting them rolling again from a dead stop. Kind of a sneaky way of getting better fuel mileage out of them using rotary spring motors on each wheel.

The same principle can be applied to a hobbs. The springmotor could be bound utilising the weight of the load being lowered, srt of like cocking a trigger. Then that trigger could be pulled once the next load is rigged and ready, but that force would not be able to unload itself until some degree of slack is available in the system.

jomoco
 
With no room to run the rope you pretty much have to snub off and let the system take a lick. In that case the question becomes, 'Does the pre-load help?'. I can't tell you, the dyno seems the only way to really know.
 
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The same principle can be applied to a hobbs. The springmotor could be bound utilising the weight of the load being lowered, srt of like cocking a trigger. Then that trigger could be pulled once the next load is rigged and ready, but that force would not be able to unload itself until some degree of slack is available in the system.

jomoco

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You've just raised the price of a Hobs to the sky...and made it even heaver to carry
 
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With all due respect Hollenreich I disagree with your last sentence above

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A preloaded rope will result in a shorter fall distance, but it's just like GB said the shock load will be greater, and the climber and rope at greater risk.

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Nice double talk. I see you disagree to agree.

Like I said if you take 50lbs drop it 5 foot it puts x amount of pull (m x d x s = fop) if you preload the weight then what you have done is increased the speed of mass but shorten the distance. Changing the numbers in the formula will still produce the same sum.

Physics is physics you can not escape the rules.

But, if you say so it must be. I guess?
 
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Rapid slack removal is demonstrated in the new GRCS video.

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This is a technique we use often. It works well.

It is also one more point as to why I would prefer the GRCS.

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Prefer the GRCS to what, Jamin?
You can do the same thing on a Hobbs, all you need is for the groundie to pull on the line and let the capstan rotate on the ratchet.
 
if you are that close to the ground with wood that big then why wouldn't you cut biscuits and and run the rope over the back side of the tree to the front and shove them off. no shock loading just a lot of work and rope wear.
 
Rarely do I tension up further than what one groundie can generate on his own with no mech ad. I save almost all pre tensioning for tip tie or balancing. If i get to close to any obstacle for dumping blocks into whatever device without enough space for stopping it appropriatly......cookies get baked. Into whatever bed ive made. Always gotta have enough space for sure. Groundie who realy knows his or her stuff truly decides it all for me. whos working today?
 
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if you are that close to the ground with wood that big then why wouldn't you cut biscuits and and run the rope over the back side of the tree to the front and shove them off. no shock loading just a lot of work and rope wear.

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Ditto
 
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if you are that close to the ground with wood that big then why wouldn't you cut biscuits and and run the rope over the back side of the tree to the front and shove them off. no shock loading just a lot of work and rope wear.

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Ditto

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Time equals money, and who said anything about being close to the ground? I said close to a target, surrounded by targets!

jomoco
 
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You did. You said 10- 15 feet.

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Sorry TH but I said target.

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When you have a target say 10-15 feet below you Blinky, letting it run is not an option. When the wood you're catching has a dia much over 3 feet and is green, even a little 4 foot section can weigh enough to snap a 3/4 inch bull line, particularly wet euc. If you cut much shorter than 4 feet you run the very real risk of losing the piece all together!

I've already made the decision to upgrade to bigger bull lines and blocks for that very reason, and it aint cheap.

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jomoco
 
"I've already made the decision to upgrade to bigger bull lines and blocks for that very reason, and it aint cheap."


Your efforts to prove your point dwells into the realm of high risks.

And for the return you get from your investment new bull lines and blocks are really not so expensive.
 
The most interesting observation I have about this thread is that Jomoco is being surprisingly well mannered for an individual who along with his cohort 'goblin' ran riot at Arboristsite for God knows how long where he proceeded to put nearly everyone's nose out of joint on a daily basis.

Hi Jojo.
 
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The most interesting observation I have about this thread is that Jomoco is being surprisingly well mannered for an individual who along with his cohort 'goblin' ran riot at Arboristsite for God knows how long where he proceeded to put nearly everyone's nose out of joint on a daily basis.

Hi Jojo.

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And that's great! The Buzz aims to keep it that way.
 
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