Wed, 8 Feb 2012|
Lieutenant Mike Wilbur of the Fire Department of New York (FDNY) compares the operational footprint of an aerial ladder to a tower ladder.
Automatically Generated Transcript (may not be 100% accurate)
All right -- Mike over. Welcome to -- engineering training that. Today going to determine the operational footprint of open real water and the tower ladder. OK we're out getting ready to measure the truck we have the -- set up here. And the truck gets set up adding I'd degree angle -- -- it's not released the chassis. And -- FitzGerald agree elevation. As you can see this is the most ruled that the drug could potentially take up. If you take the aerial and -- up an ankle obviously the footprint of the truck we'll threat. Now I have a couple of assistants firefighters that are -- back of the truck force we're gonna start with the aerial -- You're gonna take a measurement from the side of the chassis. Out the furthest -- point. Of the air with a truck like this it should be in the neighborhood. Of about thirty to 32 feet it's -- -- -- Real -- section. It's it's about 121. Or it. You can see the tape is a little short we're going -- -- -- together and get the rest of it's a thirty foot tape that was music today. It was thirty feet up to about. The middle of the lot of -- and now we're going to get arrested that. We have the measures at all. Thirty to eight. Okay so we're 32 feet -- I had the nets measurement that we're going to take it that we're going to have to imagine the -- If you go to a downtown -- stores in a tight space and you want when we anticipate using your truck. Got around to zero to ten degree angle you going to need at least as much room and order -- -- the truck. We have our fire -- measuring that truck. -- now and generally this actually should be somewhere between eight feet and eight for others it DOT regulation here. That the manufacturers have to subscribe to I think that rocket that ultimately it we can't imagine at all. Eight feet three inches and so what we're going to do now is going to it thirty to eight. And that we're going to -- that eight feet three kids. And we realize that if this front -- -- Jack. The only does that tax on imports that brought out it would take out of them all the operational -- that is well. Would -- 43. Inches. Then. Now if -- what is that the truck hopefully we'll block it a little bit more because they didn't -- and so we measured -- Jack. Realizing that -- that Jack would be. Out on the outside of the truck and what's that. Or feet by the -- inches. So that maximum operational footprint of this apparatus that would be. 45 feet nine inches 45 -- news. So that's the maximum what Brad if you -- -- -- Jack yeah -- side and -- -- and we get some practice measurement and it would it be eight feet three inches and 32 feet and and then we'll footprint for this vehicle. Then would be forty feet three inches. Realizing that most apparatus they -- Huard -- however there are a couple of manufacturers that. I did its strength they'll allow that to book her. And so you would imagine that particular vehicle you're just happy that maximum footprint because all the -- would have to be out. -- -- The next measurement that we're gonna take on this hundred -- we're about latter is a measurement from the bottom of the aerial -- down to the ground. American aerial ladders the distance that they can -- -- is calculated. Up from the tip of the aerial down to the ground. Many US cities use -- aerials in a vertical play. But most of the rest of the country user aerials and more -- horizontal play for reach. And so in order to get an accurate accounting as to what the apparatus can reach we need to subtract that measurement from the bottom of the aerial. Down to the ground and subtracting it from the hundred foot that this area was rated four. And that measurement in this case ended up being seven foot six. Sell at a zero degree angle like you see the apparatus here now -- we can use this apparatus. It won't reach a hundred feet. We have to subtract that -- -- out of that number. And it's a hundred feet that's seven foot six or we will be -- to reach at zero degrees. On a horizontal plane. 92 feet. Six inches. But it's not just 92 feet six inches this way to the right we can also reached 92. Feet six inches to the left. But that would be. That would be calculated if we had the aerial laid up against the building line. -- we know that we can't be in the collapse on -- we have to have the -- away from the building line. And so we are going to make an allowance for that about one boom -- Which again we calculated to be 32 feet away from the building. And what we get all down with these calculations. We would realize that this aerial. At zero degrees could reach about a 170 feet of the front edge of any given building. At zero degrees so a one story well the -- Now we've completed. The measurements on the hundred foot -- -- We are now going to turn and measure. -- 95 Ford did not -- aerial tower. And as you'll see here. The measurements are going to be vastly different. As it relates to the operational footprint. The next apparatus -- gonna measure. Is -- 95 what did not at -- great -- -- -- latter. As you're going to see here it's going to be vastly different. Than the rear mounted aerial -- that we did previously. What are the issues with this as we measure -- he -- geometry as relates to the turntable to the ground. You're going to see in this particular apparatus. That from the bottom of the -- down to the ground the amount that we're gonna have to subtract out of that 95 feet. Is going to be far less -- than a hundred foot truck that we did. And so we're gonna start the same way to calculate the operational footprint of this vehicle we're gonna measure from the side of the -- Out to the tip of the -- As you recall from the earliest segment that the aerial latter had a measurement from the side of the -- out to 32 feet. The aerial ladders a hundred feet it has four sections. This is eight for section -- -- tower. And the measurement it is. The measurement is 24 feet six inches. As you can -- it is dramatically less than a 32 feet for the C grade rare mountain -- The net that we're going to calculate is the chassis we need to get the -- measurement. And that again should be somewhere between eight feet. An eight foot six inches due to DOT regulation. For over the roadway and the measurement it's. The measurement is eight feet two inches so if we take the 24 feet. And the eight feet. And Ed the inches we're gonna find out that this the -- operational foot from for this vehicle if we short jacked it. It's going to be around 33 feet. We -- earlier the -- -- aerial -- we had it 32 feet. Plus the eight feet and we were over forty feet for that truck so the footprint for this -- that the minimum footprint. It is far less. Did with the we -- about that aerial. If we would have put both sets it jacks we would have to -- -- jacks to account for that if we weren't going to short -- the truck and so -- measure those for you now. So so far we have a 24 feet plus a few inches and we have eight feet plus a few inches. And so. We are at 32 feet and that we're going to add the jacket and the Jack measurement is. 64. So the -- on this truck -- six feet four inches and so we put everything together. And the operational footprint for this vehicle. Is going to be less than forty feet again far less -- any operational footprint of the -- about it tower. And we often get asked the question. What has the best -- area. And understanding that's what Barry is to -- is that -- of the building line that we can touch with the basket of the tower ladder or the tip of an aerial ladder. And -- areas dependent on two very important things who did you -- the truck from who built it. And then who designed the truck. As it was being built and and the second thing to consider is how was positioned on the fire ground ready for firefighting duty. In this case this but very this vehicle based on design -- you're gonna find is going to be a pretty good. So to wrap up here you concede that calculating. The operational footprint of the vehicle. And finding what's going to best suit your area as it relates to -- to be able to set the truck up. Is going to be a vital importance as you go to purchase the truck and as you go to use the truck get your first do. Bioengineering draining minutes this is right well.