Erick
Addicted to ArboristSite
If you were rowing your boat across a parking lot, how many doghnuts would it take to stop your car???????????
opcorn:
E.
opcorn: E.
? Physics ?
- Thread starter John Ellison
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PA Plumber
Addicted to ArboristSite
If you were rowing your boat across a parking lot, how many doghnuts would it take to stop your car???????????
E.
E.
"doghnuts"?
Erick
Addicted to ArboristSite
oops. 
There’s a u in there somewhere, ahhhh doughnuts, yeah that’s it doughnuts.
There’s a u in there somewhere, ahhhh doughnuts, yeah that’s it doughnuts.
Big Woody
ArboristSite Operative
Lets just summarize as: If you see it coming you have plenty of time to get out of the way (providing you are not in a wheelchair), if you don't see it coming time doesn't really matter.:rockn:
JohnL
Addicted to ArboristSite
heres a physics equation for the branch with no wind resistance
d = vi*t +(1/2)*a*t^2
let
vi = 0
d = 50 feet
a = 32feet/sec^2
solve for time
t = sqr root (2d/a)
= 1.767 sec
d = vi*t +(1/2)*a*t^2
let
vi = 0
d = 50 feet
a = 32feet/sec^2
solve for time
t = sqr root (2d/a)
= 1.767 sec
Justsaws
Addicted to ArboristSite
Nope.. that only for high mass low drag objects.. A branch has drag due to the air resistance and travels slower
Heck, I've seem entire tree top "float" down".:jester:
It is those kind of experiments that make miners hate scientists. Feather and a stone? It is a live bird and a dead bird off a bridge. If you drop things off bridges over water nature does the clean up.
Ekka
Addicted to ArboristSite
Ha, quick enough for an ole fart.
Erick
Addicted to ArboristSite
Anyone else find it ironic that if you got thumped in the head its probably because you didn't hear the limb break since you were wearing you safety equipment. :jester:
And since were breaking it down to thousandths of a sec. How much would your chaps and boots slow you down in your ability to make a speedy retreat.
opcorn:
FourMoCajuns
ArboristSite Operative
If you were rowing your boat across a parking lot, how many doghnuts would it take to stop your car???????????
E.
It doesn't matter ice cream doesn't have bones!
FourMoCajuns
ArboristSite Operative
Test your reaction times sober and then have a few drinks and give it a shot.
My best avg was .197........ I did hit a .066 once but that was more of a twitch. I will try later on after I have a few home brews!
My best avg was .197........ I did hit a .066 once but that was more of a twitch. I will try later on after I have a few home brews!
Anyone else find it ironic that if you got thumped in the head its probably because you didn't hear the limb break since you were wearing you safety equipment. :jester:
And since were breaking it down to thousandths of a sec. How much would your chaps and boots slow you down in your ability to make a speedy retreat.
That is pretty much what the argument was about. A guy that I used to cut with (several actually) would not wear hearing protection because they wanted to be able to "hear" anything that fell.
For myself,I have always felt that if I did'nt recognize a potential hazard or widowmaker beforehand, it would catch up to me sooner or later.
I admit that on a bad tree or snag ( theres hardly any around here) that I will sometimes loosen my earplugs or take them out. Seems like the only sure way? to not get hit from above is to know beforehand that there is a good chance of a w/m and to be looking at it whenever your making the tree move.
blis
Addicted to ArboristSite
Test your reaction times sober and then have a few drinks and give it a shot.
My best avg was .197........ I did hit a .066 once but that was more of a twitch. I will try later on after I have a few home brews!
0.205 in hangover, not bad... have to try it tomorrow again when i dont have hangover :hmm3grin2orange:
0.198 now... not much of improvement ...
Last edited:
Wes
ArboristSite Lurker
Cannon Balls
Depending on the gun, you most certainly CAN see cannon balls in flight.
Sometimes, when the light is right, you can see shotgun slugs in flight if you're shooting at a 100 yard range, which gives you time to see the slug.
Depending on the gun, you most certainly CAN see cannon balls in flight.
Sometimes, when the light is right, you can see shotgun slugs in flight if you're shooting at a 100 yard range, which gives you time to see the slug.
smokechase II
Addicted to ArboristSite
makin the tree move
John:
This is a small world that some of us live in.
The world of the firefighter who is also a faller has its specific dangers.
I wouldn't want to limit my vertical awareness on hazard trees to just when the tree is moving.
Many hazards above may have just been loosened even more by heat/burning.
Although most reading this will never have to cut during fire suppression, many will be cutting shortly after significant wind events. The hazards above then should be viewed as very similar to fire loosened ones.
Of course, working in the wind can be a huge mistake.
I remember being at the base of a dead Pondo talking over the cuts and not looking up. The limb the hit beside Joe and Jim and myself was about 6" diameter and maybe 2 feet long. It could have killed us.
Eric in N. California was hit by a similar limb and heli-coptered out. He got back on the jump list in about 5 days and it turned out his spleen had unrecognized significant damage from earlier and he almost died again. That was from a vertical blow to the head/shoulders where his spleen was damaged, (spleens usually get nailed by steering wheels in auto accidents).
An Arrowhead Hotshot, (S Cal), about 3 falls ago was working on a snag that had just caught fire. He had not started any falling cuts and was clearing an escape path when he was hit by the top and killed.
I could go on and on with these stories.
I do acknowledge that the fire damaged tree/snag world is unusual but this needs to be mentioned.
John:
This is a small world that some of us live in.
The world of the firefighter who is also a faller has its specific dangers.
I wouldn't want to limit my vertical awareness on hazard trees to just when the tree is moving.
Many hazards above may have just been loosened even more by heat/burning.
Although most reading this will never have to cut during fire suppression, many will be cutting shortly after significant wind events. The hazards above then should be viewed as very similar to fire loosened ones.
Of course, working in the wind can be a huge mistake.
I remember being at the base of a dead Pondo talking over the cuts and not looking up. The limb the hit beside Joe and Jim and myself was about 6" diameter and maybe 2 feet long. It could have killed us.
Eric in N. California was hit by a similar limb and heli-coptered out. He got back on the jump list in about 5 days and it turned out his spleen had unrecognized significant damage from earlier and he almost died again. That was from a vertical blow to the head/shoulders where his spleen was damaged, (spleens usually get nailed by steering wheels in auto accidents).
An Arrowhead Hotshot, (S Cal), about 3 falls ago was working on a snag that had just caught fire. He had not started any falling cuts and was clearing an escape path when he was hit by the top and killed.
I could go on and on with these stories.
I do acknowledge that the fire damaged tree/snag world is unusual but this needs to be mentioned.
Smokechase II you are so right. Twice I have been in the woods on calm days and heard trees go down. Neither time was connected with logging, I was just walking. I would imagine burning/burned timber is that much more likely to do so.
Well said.
smokechase II
Addicted to ArboristSite
another terrible story
Glen and Tim, local cutters had a friend that was part of a three person group hiking through a big tree area in Western Oregon on a very windy day.
The group split up and was looking over the timber sale or whatever it was.
At the other end, the two that came out waited a bit then went back in looking for the third.
They think the noise of the wind was loud enough that he never knew what hit him. It was a top that impaled him, no details here, he had died quickly.
No one was cutting. Just a windy day in the woods.
Two common thoughts:
Experienced fallers all have at least one friend that died on a windy day.
There are old fallers and there are bold fallers, but there are no old-bold fallers
Glen and Tim, local cutters had a friend that was part of a three person group hiking through a big tree area in Western Oregon on a very windy day.
The group split up and was looking over the timber sale or whatever it was.
At the other end, the two that came out waited a bit then went back in looking for the third.
They think the noise of the wind was loud enough that he never knew what hit him. It was a top that impaled him, no details here, he had died quickly.
No one was cutting. Just a windy day in the woods.
Two common thoughts:
Experienced fallers all have at least one friend that died on a windy day.
There are old fallers and there are bold fallers, but there are no old-bold fallers
Here is another timer. Times should be a bit slower as, while you know what will happen, you don't know where on the screen it will be.
http://www.bbc.co.uk/science/humanbody/sleep/sheep/
My times are in the .24 .25 range which is "needs improvement". No surprise there. At 71 I already knew my reaction times are down. They are steady though. I was piling them up right down the middle line.
Harry K
http://www.bbc.co.uk/science/humanbody/sleep/sheep/
My times are in the .24 .25 range which is "needs improvement". No surprise there. At 71 I already knew my reaction times are down. They are steady though. I was piling them up right down the middle line.
Harry K
Erick
Addicted to ArboristSite
.194 on 3 hrs sleep.
