If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below. |
|
|
|
Thread Tools | Display Modes |
|
#1
|
|||
|
|||
Power Lines..
I've seen power lines marked on sectionals. How high are the highest
major power transmission lines? They look quite high from the ground, but there's not much to give perspective. --Dan |
#2
|
|||
|
|||
Power Lines..
On 20 Aug 2006 22:18:35 -0700, "Dan" wrote:
I've seen power lines marked on sectionals. How high are the highest major power transmission lines? They look quite high from the ground, but there's not much to give perspective. They vary depending upon a lot of factors from what I understand... The highest one is over in Europe and is 227 meters tall... http://en.wikipedia.org/wiki/Elbe_crossing_2 Most of the ones that I see locally are probably only 200-300 ft tall at most... |
#3
|
|||
|
|||
Power Lines..
Dan wrote:
I've seen power lines marked on sectionals. How high are the highest major power transmission lines? They look quite high from the ground, but there's not much to give perspective. --Dan Power lines are marked for use as visual landmarks, NOT as obstructions. |
#4
|
|||
|
|||
Power Lines..
Ron Natalie wrote:
Dan wrote: I've seen power lines marked on sectionals. How high are the highest major power transmission lines? They look quite high from the ground, but there's not much to give perspective. --Dan Power lines are marked for use as visual landmarks, NOT as obstructions. Agreed.. the right of ways are very distinctive when they head off through forestland.. I live on the gulf coast, and pretty much the vast majority are 200 feet or less. Crossing a major ship channel, or the mississippi, you may find them up to 500 feet agl though, to allow ships to pass under. Dave |
#5
|
|||
|
|||
Power Lines..
On Mon, 21 Aug 2006 15:39:14 GMT, Dave S
wrote: I live on the gulf coast, and pretty much the vast majority are 200 feet or less. Crossing a major ship channel, or the mississippi, you may find them up to 500 feet agl though, to allow ships to pass under. They don't need 500 ft to allow the ships to pass underneath, but since the lines dip in the center between the towers and this is a function of the distance between the towers, crossing a major waterway would require the towers to be higher since the distance between towers is greater... I'm not sure what the tallest ship might happen to be... Probably 300 ft at the most... According to the following link, there was a sail powered ship that had a 295 ft carbon fiber mast... That sounds impressive... http://www.guinnessworldrecords.com/...recordid=43706 An aircraft carrier requires about 215 ft above the waterline for clearance of bridges and such... For power lines, you would probably want to add another 100 or 200 ft for safety... |
#6
|
|||
|
|||
Power Lines..
"Dave S" wrote in message
nk.net... ... I live on the gulf coast, and pretty much the vast majority are 200 feet or less. Crossing a major ship channel, or the mississippi, you may find them up to 500 feet agl though, to allow ships to pass under. Dave Clearances above water: Golden Gate Bridge, 220 feet Brooklyn Bridge 135 feet at mid-span George Washington Bridge 64.62 meters (212 ft) at mid-span San Francisco-Oakland Bay Bridge 220 feet (67 m) (west span) 191 feet (58 m) (east span) Mackinac Bridge 155 ft (47 m) What later became known as the Crescent City Connection was the second bridge to span the Mississippi south of Baton Rouge after the Huey P. Long Bridge a few miles up river from the city, and the first bridge across the river in New Orleans itself. 51.8 meters (170 feet) Ambassador Bridge and Blue Water Bridge (both run between Michigan and Ontario over the Detroit and St. Claire Rivers respectively) are both 152 feet above the water. source: en.wikipedia.org -- Geoff The Sea Hawk at Wow Way d0t Com remove spaces and make the obvious substitutions to reply by mail When immigration is outlawed, only outlaws will immigrate. |
#7
|
|||
|
|||
Power Lines..
Capt. Geoffrey Thorpe wrote:
Clearances above water: Golden Gate Bridge, 220 feet Brooklyn Bridge 135 feet at mid-span George Washington Bridge 64.62 meters (212 ft) at mid-span San Francisco-Oakland Bay Bridge 220 feet (67 m) (west span) 191 feet (58 m) (east span) Mackinac Bridge 155 ft (47 m) Fred Hartmann bridge in Baytown (Houston) over the ship channel 178 feet with 440 ft suspension towers. Tall power lines nearby that cross the channel. Cooper River Bridge in Charleston, SC (near a former naval base) 200 ft clearance with over 575 ft suspension towers. |
#8
|
|||
|
|||
Power Lines..
In article ,
Ron Natalie wrote: Power lines are marked for use as visual landmarks, NOT as obstructions. Unless it is a catanary spanning a valley. |
#9
|
|||
|
|||
Power Lines..
There are some awesome powerlines spanning valleys in Idaho near the
Snake River and let me tell you they are a loong way up from the bottom of the valley, easily 500', probably 1000' or more.... Some of the lines are on the sectional. I've never seen a power line on a sectonal marked with obstruction footage, but they might exist. john smith wrote: In article , Ron Natalie wrote: Power lines are marked for use as visual landmarks, NOT as obstructions. Unless it is a catanary spanning a valley. |
#10
|
|||
|
|||
Power Lines..
Doug wrote:
There are some awesome powerlines spanning valleys in Idaho near the Snake River and let me tell you they are a loong way up from the bottom of the valley, easily 500', probably 1000' or more.... Some of the lines are on the sectional. I've never seen a power line on a sectonal marked with obstruction footage, but they might exist. john smith wrote: In article , Ron Natalie wrote: Power lines are marked for use as visual landmarks, NOT as obstructions. Unless it is a catanary spanning a valley. I was assuming we were talking the normal chart power line symbol (these look like little power line towers with lines connecting them). Where the towers themselves are obstructions one of the obstruction symbols (inverted V with a . in it) will be shown. An example around here is on the Potomac river just north of Quantico, VA (more apparent on the Washington/Baltimore TAC chart than the Washington Sectional). |
|
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
NTSB report - ILS and ATC. How does it all come together? | Montblack | Piloting | 21 | June 22nd 06 10:35 PM |
NTSB report - ILS and ATC. How does it all come together? | Montblack | Piloting | 1 | June 19th 06 11:26 PM |
I want to build the most EVIL plane EVER !!! | Eliot Coweye | Home Built | 237 | February 13th 06 03:55 AM |
Power setting table and best economy/best power... | xerj | Piloting | 29 | October 20th 05 02:44 AM |
Funny story about naval | [email protected] | Naval Aviation | 0 | December 20th 04 03:37 AM |