OT helicopter crash

On Mon, 02 Dec 2013 17:57:55 +0000, Peter Duncanson
wrote:

Ah, the unforseen benefits of a bit of 'Over engineering'. That
probably accounts for the wonder that the flat roof didn't
_immediately_ collapse from the impact. The incident could have
involved many more fatalities if it had been a "Modern Flat Roof".

If there had been a pitched roof with tiles or slates that might have
absorbed much of the energy resulting in less damage in the rooms below.

I very much doubt it. Tiles and slates don't absorb energy, they just
shatter and send (sharp) debris everywhere.

Geoff Pearson wrote:

I suspect the building is the remnant of a four storey tenement - the
reports say the walls are nearly a metre thick sandstone. So this is a
floor that has been felted, rather than a purpose built roof.

Normal practice is to create a roof a little distance above the old floor.

Bill

On Mon, 02 Dec 2013 19:07:48 GMT, Paul Ratcliffe
wrote:

On Mon, 02 Dec 2013 17:57:55 +0000, Peter Duncanson
wrote:

Ah, the unforseen benefits of a bit of 'Over engineering'. That
probably accounts for the wonder that the flat roof didn't
_immediately_ collapse from the impact. The incident could have
involved many more fatalities if it had been a "Modern Flat Roof".

If there had been a pitched roof with tiles or slates that might have
absorbed much of the energy resulting in less damage in the rooms below.

I very much doubt it. Tiles and slates don't absorb energy, they just
shatter and send (sharp) debris everywhere.

It's not the tiles and slates, it would be the wooden inverted-V roof
timbers that would absorb some of the energy before the falling object
hit the ceiling below.

I'm not suggesting that a pitched roof would work miracles, just that it
would help to slow the falling object.

--
Peter Duncanson
(in uk.tech.digital-tv)

"Bill Wright" wrote in message
...
Geoff Pearson wrote:

I suspect the building is the remnant of a four storey tenement - the
reports say the walls are nearly a metre thick sandstone. So this is a
floor that has been felted, rather than a purpose built roof.

Normal practice is to create a roof a little distance above the old floor.

Bill

The flat roof on part of my house in Edinburgh is the same construction as
the floor below - tongued and grooved planks and felted (just the roof).
Now insulated on the outside.

On 02/12/2013 22:34, Peter Duncanson wrote:

It's not the tiles and slates, it would be the wooden inverted-V roof
timbers that would absorb some of the energy before the falling object
hit the ceiling below.

I'm not suggesting that a pitched roof would work miracles, just that it
would help to slow the falling object.

The chopper *might* have bounced/rolled off a pitched roof, and landed
in the street. Whether that would have resulted in fewer casualties is
down to chaos theory.



--
Mark
Please replace invalid and invalid with gmx and net to reply.

In article ,
Mark Carver wrote:
On 02/12/2013 22:34, Peter Duncanson wrote:

It's not the tiles and slates, it would be the wooden inverted-V roof
timbers that would absorb some of the energy before the falling object
hit the ceiling below.

I'm not suggesting that a pitched roof would work miracles, just that it
would help to slow the falling object.

The chopper *might* have bounced/rolled off a pitched roof, and landed
in the street. Whether that would have resulted in fewer casualties is
down to chaos theory.

It must have come down very hard if the 3 occupants died.

--
From KT24

Using a RISC OS computer running v5.18

On 03/12/2013 11:23, charles wrote:
In article ,
Mark Carver wrote:
On 02/12/2013 22:34, Peter Duncanson wrote:

It's not the tiles and slates, it would be the wooden inverted-V roof
timbers that would absorb some of the energy before the falling object
hit the ceiling below.

I'm not suggesting that a pitched roof would work miracles, just that it
would help to slow the falling object.

The chopper *might* have bounced/rolled off a pitched roof, and landed
in the street. Whether that would have resulted in fewer casualties is
down to chaos theory.

It must have come down very hard if the 3 occupants died.

Well someone calculated that if free fall from 100 ft, about 60 mph ?

We don't know whether it went straight through the roof, or whether
that happened seconds later. If you assume the latter, the deceleration
from 60 to 0 in virtually zero time is enough to rip your organs apart ?



--
Mark
Please replace invalid and invalid with gmx and net to reply.

Peter Duncanson wrote:

I'm not suggesting that a pitched roof would work miracles, just that it
would help to slow the falling object.


If the bottom ends of the roof members are properly tied across from one
side to the other by being bolted to horizontal battens which span the
roofspace a pitched roof can be extremely strong.

For instance a 500 brick chimney will most likely roll down rather than
fall through if it has failed at roof height.

In the case of a pitched roof fitted over an old flat roof these
horizontal members usually are a little way above the old roof, and they
are a big nuisance of you're working up there.

https://dl.dropboxusercontent.com/u/...0of%20loft.jpg

https://dl.dropboxusercontent.com/u/...fixing%202.jpg

Bill

Mark Carver wrote:
On 02/12/2013 22:34, Peter Duncanson wrote:

It's not the tiles and slates, it would be the wooden inverted-V roof
timbers that would absorb some of the energy before the falling object
hit the ceiling below.

I'm not suggesting that a pitched roof would work miracles, just that it
would help to slow the falling object.

The chopper *might* have bounced/rolled off a pitched roof, and landed
in the street. Whether that would have resulted in fewer casualties is
down to chaos theory.

And without wishing to seem callous I dare say 'chaos' is often a factor
outside Glasweigan pubs at half ten on a Friday night.

Bill

On 03/12/2013 14:45, in article , "Bill
Wright" wrote:

Mark Carver wrote:
On 02/12/2013 22:34, Peter Duncanson wrote:

It's not the tiles and slates, it would be the wooden inverted-V roof
timbers that would absorb some of the energy before the falling object
hit the ceiling below.

I'm not suggesting that a pitched roof would work miracles, just that it
would help to slow the falling object.

The chopper *might* have bounced/rolled off a pitched roof, and landed
in the street. Whether that would have resulted in fewer casualties is
down to chaos theory.

And without wishing to seem callous I dare say 'chaos' is often a factor
outside Glasweigan pubs at half ten on a Friday night.

Do you wish to seem ignorant? Because that is what you are.

--
Bill Findlay
with blueyonder.co.uk;
use surname & forename;