Humptulips
ArboristSite Guru
You have some good points there. I don't understand the one leg of haywire thing, how does that work? I don't pull haywire from the landing to often. Lucky for me the company I work for only does clear cut logging, so most of the time I can get away with making the hook up right by the tail and flying the haywire with the rigging. That way I only have to pull two real short legs of haywire. One major advantage I would like about the standing skyline set up, would be not needing to clean under the tail block during fire season.
What I mean by one leg of strawline. I usually left my transfer out so maybe only set its back line up every few days. You know well every situation different so that's pretty general.
I know in clearcuts you're flying the lines over but usually more to string then if you only had the waste line and the road line to string. It's really bad on those running skyline rigs when thinning. You have to string both sides of the layout all the way to the landing, ouch!
Another way I used to handle the backline when thinning was to string it on the road ahead. When the road was changed you can leave it lay and it works for your road line on the next change. You're always stringing wire two roads ahead. Last road you get to flop over so you get a break. You usually end up spending it nothching stumps for the next setting. A hooks work is never done!
Around where I have worked never used the term running skyline. Always called them tension skidders or just a grapple yarder. It's really just a grabinski.
What kind of machine you work on? I worked on a Skagit PSY200 about 25 years ago and a Thunderbird (forget the number) more recently.
I got a bad scare while working on that Thunderbird. I was standing beside the mainline drum watching it because the engineer was worried about wear on the end of the line when boom. We broke both gantry straps. Down she come. Nothing touched me but it put the fear of god in me. We had new straps with Ds and the line shop neglected to clean the acid off the line before pouring the babbit. Corroded them just inside the D where you couldn't see. 4 months old when they broke.