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  1. oldfart

    APTA-tude adjustment

    Sonshine, we've had the same experience. With the ball valve, I used 160-200 and never broke a bag. The valve geometry "ramps up" the pressure and accelerates the bag more gently, but at the cost of reduce range and wider groups. The butterfly shoots higher (and with less variability) so you...
  2. oldfart

    APTA-tude adjustment

    Gpick, I've tried different waddings from a handful of leaves to some very nice cylinders cut from closed cell foam. Generally, I'm not a fan because 1) they're not needed for normal shots and 2) I don't like chasing the foam disk across the yard on a windy day. But, if you are going for...
  3. oldfart

    APTA-tude adjustment

    Jeff, a 16g cartridge works fine with a stock APTA. But the $/shot is about double over a 12g. But th Zefal connector is small, cheap and makes perfect sense as a backup.
  4. oldfart

    APTA-tude adjustment

    Merle, you made me laugh out loud. Nice to hear from you ... It's been a while. Tom
  5. oldfart

    APTA-tude adjustment

    Great comment. Calcs are correct. The "sweet spot" of my pressure chamber is 31 cuin or 36" x 1" Scd40 aluminum, pumped to 130 psi or one 12g cartridge. I got to that number by starting with a 72" chamber and lopping off 6-12" at a time and running shot tests. Here's what I learned: 1. You...
  6. oldfart

    Gaining confidence working high

    Great question, Holden. Is there a method to help? I was already an oldfart when I started climbing. My kill zone was anything higher than the coffee table. My background let me trust my equipment pretty easily. But my inexperience with the tree put the fear of God in me that I could fail...
  7. oldfart

    APTA-tude adjustment

    Thanks for the comment, Tree. I really don't know what TS is going to do ... there's way more work to do to turn this into a real product. And it's not clear what the market really wants to buy. Make yourself heard ... ! If your comment was to suggest hitting that branch was an easy target...
  8. oldfart

    APTA-tude adjustment

    I’ve been working with Nick and Luke to get “tighter groups” with the APTA. This vid shows my latest configuration. It isn’t a product, you can’t buy it and it’s not even a good idea for a product because it’s so customized to me personally. Nevertheless, I’m absolutely convinced that these...
  9. oldfart

    APTA-tude adjustment

    Yep. For me, it's a no-brainer. I just don't have the arm strength to quickly open the big ball without the barrel jumping all over. But there are a couple of issues with the butterfly ... Yes, Stihl, the pressure rating drops from 600 to 175 psi. These rating are done under static...
  10. oldfart

    Scuba clips for lanyard management

    Yep. It's still up on the old video.
  11. oldfart

    Scuba clips for lanyard management

    hey, JT ... I've had good luck with 8mm All Gear Tech Cord (now called TVP) on 10mm OP as an adjusting prussic (not a climbing prussic). Strong and very easy to splice (Class II).
  12. oldfart

    APTA-tude adjustment

    Good tips! I’ve used two pumps with my APTA. I like them both, I recommend them, but they are in different leagues. Joe Blow Topeak, Race Model 200 psi, steel body, rubber hose, plastic Chuck (lever-on with pressure release) $45 retail, most bike shops Serfas FMP-969 260 psi, alloy body, ss...
  13. oldfart

    APTA-tude adjustment

    Hey Adam. Nice to hear from you again. Sorry for the slowness. It’s been hectic times for me and in Indianapolis both, but we’re making serious progress. About a month ago Nick sent me a game changer: a 1.5 inch butterfly valve for the APTA. It was killer good for two (2) reasons… opening...
  14. oldfart

    DMM throw hook.

    Interesting? Interesting? If you want interesting try: http://www.wilcoxind.com/Vertical-Assault-Climbing-Hook-P90C53.aspx Bring your wallet!!! OF
  15. oldfart

    APTA-tude adjustment

    Guys, I like the OF configuration for the APTA. It's working for me on a daily basis, I think it advances the state of the art, and it's a huge time-saver over my BigShot. BUT BUT BUT last week a surprise package showed up from Nick and Luke. I'm still working with it, but here's my early...
  16. oldfart

    APTA-tude adjustment

    With the shorter 36”pressure chamber, the APTA/OF packs down into a surprisingly small package. All you need beyond this is your throwline and a bag! I prefer the Red Dot over a laser in every respect EXCEPT ONE: the laser doesn’t stick out looking for trouble during transport. A cheap...
  17. oldfart

    APTA-tude adjustment

    Guys, thanks for the good comments, especially about the pressure from a 16g cartridge. When I realized my error, I thought maybe there was a sweet spot for the combination of TreeStuff barrel length, the 12 oz. bag weight and the best volume for a pressure chamber. Sure enough, I got some...
  18. oldfart

    APTA-tude adjustment

    gmcttr, Thanks for doing this. I got it completely wrong ... I "double pumped" the chamber without clearing the previous charge. Pilot error. Officer Boyle came over a wrote me a ticket for being so stupid ... ignorance of the Law is no excuse. I re-tested twice with 16g and got 165 psi...
  19. oldfart

    APTA-tude adjustment

    Thanks for the testing and feedback! Your calculations are correct and the chambers are nominally the same. Your test is consistent with my 12g test but I can't explain the 16g result. I'll retest and post. Thanks again.
  20. oldfart

    APTA-tude adjustment

    I'd definitely like to go to aluminum, probably Sch80 if I was using the cartridges. But I'd stay with steel for the fittings ... the run-of-the-mill aluminum grade top out at 150 psi. Speaking of fittings, the reduction coupling surprised me ... it cups the bag better and increases the range...

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