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HeliTorque :: View topic - Surviving Wires Environment
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HeliTorque Forum Index » Essential Reading, Viewing & Browsing

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Surviving Wires Environment
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bom
High Flying 'Torquer
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PostPosted: Wed Mar 30, 2011 10:59 pm    Post subject: Surviving Wires Environment Reply with quote

I found this collection of videos on YT about the risks of wire strikes so I thought I would share:

Part 1
http://www.youtube.com/watch?v=TjgsbeBFOHw&feature=related

Part 2
http://www.youtube.com/watch?v=iwaKh3kfyM4&feature=related

Part 3
http://www.youtube.com/watch?v=EBhmKNK4Pp0&feature=related

An actual Wire Strike, very shocking I thought! *Actually, this vid is not of a wire strike, its blade contact.
http://www.youtube.com/watch?v=oDIwWPbCx7Y&feature=related

Fly Safe.
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animalsticks
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PostPosted: Thu Mar 31, 2011 1:02 pm    Post subject: Reply with quote

Still say we should put the plastic balls on the wires - surely costs less than replacing helicopters not to mention the lives it'll save.
As for the eye-sore issue people originally complained about the red telephone boxes and post boxes and now complain that they're disappearing. Ok they're not 100ft up but you see my point.
Burying wires would be very expensive. Maybe we should invent something to make it easy?
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paddywak
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PostPosted: Sat Jul 16, 2011 9:20 pm    Post subject: Reply with quote

Some good useful footage there, I was doing a spot of revision yesterday going through some old books and test papers to see what I had forgotten and highlight areas I need to brush up on.

One of the questions I got wrong was:

When crossing a power line in poor weather the pilot should:
(a) Cross midway between the poles at 90 degrees
(b) Cross over a pole at 90 degrees to the lines
(c) Cross over a pole at 45 degrees to the lines
(d) Cross under the line at a safe alt whenever possible

I chose (b) as I quite often on my approach back in to EGBJ deviate slightly
from track to make sure I fly directly overhead a pylon and take the shortest
route across then join the circuit.

In the answers section the book states that (c) is the correct answer.

Any thoughts anyone?
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LoachBoy
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PostPosted: Sun Jul 17, 2011 9:14 am    Post subject: Reply with quote

Aim for the pole cos its the easiest bit to see.... and keep sight of.

And I guess cross at 45 deg (same as you do with mountain ridges), cos if the old donkey goes pop, you have a shorter turn to make to autorotate away from a rather large obstacle!
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tombeeston
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PostPosted: Sun Jul 17, 2011 5:09 pm    Post subject: Reply with quote

is it easier to see the wires for longer if you cross at 45 degrees??
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PilotWolf
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PostPosted: Sun Jul 17, 2011 7:12 pm    Post subject: Reply with quote

tombeeston wrote:
is it easier to see the wires for longer if you cross at 45 degrees??


I wondered that but does it not put you closer to the wires for longer than crossing at 90 degrees?

W.
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haggishunter
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PostPosted: Sun Jul 17, 2011 7:29 pm    Post subject: Reply with quote

Cross over the pole because there won't be any wires above it.

Nice find on the videos!

HH
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PilotWolf
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PostPosted: Sun Jul 17, 2011 8:33 pm    Post subject: Reply with quote

HaggisHunter wrote:
Cross over the pole because there won't be any wires above it.

Nice find on the videos!

HH


That bit was fairly obvious Wink but why at 45 degrees?

W.
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paddywak
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PostPosted: Mon Jul 18, 2011 10:56 am    Post subject: Reply with quote

I'm starting to doubt some of the answers in this book as I have found another question I have apparently answered incorrectly:

DETERMINE DENSITY ALT FOR THESE CONDITIONS:

1 inch = 1000ft as this is a Canadian book and they don't do Mb.

Altimeter setting =29.95 inches
OAT= +27 C
Indicated Altitude= 5250ft

I worked this out as follows: Altimeter setting 29.95
standard pressure 29.92

Difference = 00.03
Equates to = 30ft
Pressure alt = 5250ft
- 30ft
= 5220ft

Lapse rate of 2 C per 1000ft = 5250ft x 2 degrees C = 10.5 C

Standard Temperature= +15C minus+10.5C= +4.5C

OAT +27C minus +4.5 = 22.5C

DA= PA + (120 x 22.5C)
DA= 5220+ (2700)
DA= 7920ft

The choice of answers in the book are:

(a) 7700ft
(b) 8500ft
(c) 5877ft
(d) 4600ft

The books states that (b) 8500ft is the correct answer.

Trying not to doubt myself, what have I missed?


Dunno dontknow
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haggishunter
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PostPosted: Mon Jul 18, 2011 12:24 pm    Post subject: Reply with quote

Haha, yeah kinda obvious, sorry.

I would say 45 degrees as you will see the wires for a longer time as previously mentioned, but also less of a turn required if you discover last second you are unable to clear the obstruction.

HH
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