Alright, now we're talking worthwhile ascension rates! Not being mid-line attachable is not a deal-breaker for me. My only other concern is the sturdiness of the appendages/knobs sticking out from the device. How much banging about against tree limbs will they withstand? Yet another reason...
They are military grade and appear to be targeting operations by special forces since they're submersible. One of the websites stated sales were only to "official" organizations, and the other asked that you contact them directly regarding sales. It would not surprise me if they are around...
Lift speed of 2 feet per second. That's it? Other battery-powered ascenders are variable speed with some reaching 10 feet per second (plus being submersible). Granted, 2'/sec is reasonable and 10'/sec is way too fast for tree work, but what about slower speeds?
At the 2:52 mark, I started to think, "Wow! Look how fast he spikes up that spar." Then I realized the scene was being played in reverse. Had me going there for a second or two. Golf course work looks appealing ... minimal targets in the DZ, no houses, and no power lines. Nice vid!
Erik - You may want to edit that post & delete your email address. There are automatic programs which search online forums for valid email addresses for all sorts of reasons ... many of them not good.
Mills around here typically won't bother with trees from privately owned land. I heard it's because of the high risk of hardware embedded within. OTOH, most paper mills want chips versus logs ... not as costly for them to process.
OTOH, Steve, it sure sounds like you're happier with this crew than your last job. I've never done a crane job, but have worked around cranes for almost 40 years. Where I work, ALL lifts must be vertical ... absolutely no side-loading. In fact, I was a co-inventor on a recently issued patent...
Redwood tree for only $100! What a bargain.
http://norfolk.craigslist.org/mat/5866743156.html
Here's the text copied from that Norfolk, VA CL ad:
I have a very large Redwood Tree (purchased from a local nursery as a seedling years ago) that I want to sell on the stump for $100 cash or credit...
Those two vids are OMG-moments if I ever saw one. I enjoyed watching him on "This Old House" years ago, but he obviously needs to stay away from chainsaws. Thanks for sharing.