On 11/19/2012 2:04 AM, Grant Saviers wrote:
A friend had PVC pipe fragments migrating out of his face for years
after a rupture of the PVC pipe these gadgets are made from. His
"event" was a potato cannon failure, but there isn't much difference
when the pressure gets to 80psi. PVC doesn't show on an x-ray.
PVC piping is an ABSOLUTE NO-NO in commercial compressed air systems
since minor damage can escalate into ruptures and high energy flying
slivers and fragments. Thus, having one's face right next to the
pressure storage tank is a very bad idea. Handling damage can be
concealed, cold is bad since the plastic gets brittle and heat is bad
because the pressure rating is significantly reduced.
Making one from sch 80 PVC pipe is probably safer, since the pressure
ratings are much higher, the fittings much stronger, and the supplier
probably not the cheapest the big box can buy, what the forklift driver
probably dropped or the customer walked on. Another idea might be to
fiberglass wrap the tank (with a PVC compatible resin) as a "shatter
shield". Good solvent gluing is extremely important as a 4" PVC cap on
a pressure tank at 80psi has about 1000 lbs of force on it.
Beyond "no safety warranty" as Roger notes, PVC launchers are the
ultimate in caveat emptor. As a friend used to say about his Winchester
458 magnum rifle - "kills at one end and maims at the other".
And the ones I've seen used combustion which probably hit far higher
than 80 PSI peak. OTOH I'd trust them farther than some of those with
pressure tanks<:-)) Bout as safe as throwing the antenna over a power
line. (I've read that has actually happened.)
I've wanted a 50 Baret M82 for years. Too big and heavy to carry deer
hunting, probably topple the tree the stand is in, and it'd blow out all
the windows. (hunt in comfort with heat and fresh coffee.) Each year the
kids seem to add a bit of home<:-)) It's actually not that worse if any
than the 458, although if you can afford a custom Lapua (Al' Pu ah) in
the Baret it's tame compared to a conventional 458.
A bit off topic but I figured a few might appreciate the educational
aspects.
Here's a shot of a little practice with the M82 50 (watch out for line wrap)
Kind of a different way to look at target shooting.
http://www.google.com/imgres?imgurl=http://www.spearfishingplanet.com/attachments/general-off-topic/19520d1269171043-barrett-50-sniper-rifle-put-smile-your-face-303171_pm-jpg&imgrefurl=http://www.spearfishingplanet.com/general-off-topic/18137-barrett-50-sniper-rifle-put-smile-your-face.html&h=275&w=484&sz=144&tbnid=hjOtjFoDW9grZM:&tbnh=75&tbnw=132&zoom=1&usg=__XPbJhyj9K2R6zk5ssZrUL_gr3g4=&docid=u51lyWX8PNyGdM&sa=X&ei=de6pUIjBJa-60AGYmoDACg&ved=0CFEQ9QEwBA&dur=4812
Never believe wiki. They call it shoulder mounted. Try that and stay
upright.
73
Roger (K8RI)
Grant KZ1W
On 11/18/2012 8:57 PM, K8RI wrote:
On 11/18/2012 11:08 PM, Jim W7RY wrote:
Isn't it great... ! noTHING like hams supporting the hobby through
small
businesses... I just got a pneumatic tennis ball wire antenna
launcher... no
tree top can beat this thing, haha. 80lbs = 200ft ASL
These can be built for a couple of bucks that weigh less than 10#
Google is your friend. Check potato gun or tennis ball gun.
or just tennis ball/hair spray will bring up lots of instructions.
Remember these things do not come with a safety warranty.
73
Roger (K8RI)
73,
Dave
wa3gin
Agree 100%. I built one out of a kit. They work FABULOUS!!
I need to devise a good way to use Co2 so it's a bit more portable.
73
Jim W7RY
----- Original Message ----- From: "David Gilbert"
<xdavid@cis-broadband.com>
To: <towertalk@contesting.com>
Sent: Sunday, November 18, 2012 1:55 PM
Subject: Re: [TowerTalk] Climbing Belts/Harnass
Let's just say that I find it ironic that this reflector is sponsored
by K7LXC, the owner of Champion Radio Products.
http://www.championradio.com/shop/Safety-Equipment.5
73,
Dave AB7E
On 11/18/2012 11:41 AM, Stephen Colello wrote:
I have the same interest--so please make all responses to reply all.
Steve
KA2KON
----- Original Message ----- From: "Anthony (N2KI)"
<n2ki.ham@gmail.com>
To: <towertalk@contesting.com>
Sent: Saturday, November 17, 2012 5:32 PM
Subject: [TowerTalk] Climbing Belts/Harnass
I have to replace my very old climbing belt . I want to purchase
one for
tower work. Can someone point me in the direction of a reputable
distributor and possible suggest a model?
Thanks
Regards,
Anthony J. Cioffi (N2KI)
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