Which pips?

In article ,
Bill Wright wrote:
Davey wrote:
On Thu, 12 Sep 2013 00:05:34 +0100
Bill Wright wrote:

R. Mark Clayton wrote:

what happens at Rugby, these days?
Many years ago I drove a large vehicle through the town wondering
what the smell was. I'd got the handbrake on.

Bill

It wasn't very effective at stopping the vehicle, then.

In those days few handbrakes were.

Handbrake efficiency in those days had to be better than now, as it was
the emergency brake. Now with dual circuit brakes, it's merely a parking
brake.

--
*Don't squat with your spurs on *

Dave Plowman London SW
To e-mail, change noise into sound.

"Dave Plowman (News)" wrote in message
...
In article ,
Bill Wright wrote:
Davey wrote:
On Thu, 12 Sep 2013 00:05:34 +0100
Bill Wright wrote:
R. Mark Clayton wrote:

what happens at Rugby, these days?
Many years ago I drove a large vehicle through the town wondering
what the smell was. I'd got the handbrake on.

It wasn't very effective at stopping the vehicle, then.

In those days few handbrakes were.

Handbrake efficiency in those days had to be better than now, as it was
the emergency brake. Now with dual circuit brakes, it's merely a parking
brake.

'Had to be'? I don't think that handbrakes have ever been much use as an
emergency brake.

(I've heard that in the Model T Ford the only way to stop them in a hurry
was to stamp on the reverse pedal.)

--
Max Demian

In article ,
Max Demian wrote:
Handbrake efficiency in those days had to be better than now, as it
was the emergency brake. Now with dual circuit brakes, it's merely a
parking brake.

'Had to be'? I don't think that handbrakes have ever been much use as an
emergency brake.

They are all tested 'on the move' at MOT time. Of course anything which
only works on the rear wheels wouldn't be much good in a true emergency -
but if the emergency is brake failure, better than nothing.

--
*Gargling is a good way to see if your throat leaks.

Dave Plowman London SW
To e-mail, change noise into sound.

In article ,
Max Demian wrote:
"Dave Plowman (News)" wrote in message
...
In article ,
Bill Wright wrote:
Davey wrote:
On Thu, 12 Sep 2013 00:05:34 +0100
Bill Wright wrote:
R. Mark Clayton wrote:

what happens at Rugby, these days?
Many years ago I drove a large vehicle through the town wondering
what the smell was. I'd got the handbrake on.

It wasn't very effective at stopping the vehicle, then.

In those days few handbrakes were.

Handbrake efficiency in those days had to be better than now, as it was
the emergency brake. Now with dual circuit brakes, it's merely a parking
brake.

'Had to be'? I don't think that handbrakes have ever been much use as an
emergency brake.

In the days when SWMBO had a Mini (late 70s), the MOT test included the
stopping power of the hand brake.

--
From KT24

Using a RISC OS computer running v5.18

Dave Plowman (News) wrote:
In article ,
Bill Wright wrote:
Davey wrote:
On Thu, 12 Sep 2013 00:05:34 +0100
Bill Wright wrote:

R. Mark Clayton wrote:

what happens at Rugby, these days?
Many years ago I drove a large vehicle through the town wondering
what the smell was. I'd got the handbrake on.

Bill
It wasn't very effective at stopping the vehicle, then.

In those days few handbrakes were.

Handbrake efficiency in those days had to be better than now, as it was
the emergency brake. Now with dual circuit brakes, it's merely a parking
brake.

It wasn't though. I regularly drove a 1948 Morris Commercial, a 1956
Bedford 3 tonner, a 1956 Molly Minor, and a 1961 Bedford CA. None of
them had a very good handbrake. The normal practice with bigger vehicles
was to not trust the handbrake. Always park with the wheels turned to
the kerb. I always carried bricks to chock the wheels.

Bill

In article ,
charles wrote:
'Had to be'? I don't think that handbrakes have ever been much use as
an emergency brake.

In the days when SWMBO had a Mini (late 70s), the MOT test included the
stopping power of the hand brake.

It still does - and always has done. Even on an auto, where it may never
be used.

--
*Indian Driver - Smoke signals only*

Dave Plowman London SW
To e-mail, change noise into sound.

On 2013-09-12, Dave Plowman (News) wrote:
In article ,
charles wrote:
'Had to be'? I don't think that handbrakes have ever been much use as
an emergency brake.

In the days when SWMBO had a Mini (late 70s), the MOT test included the
stopping power of the hand brake.

It still does - and always has done. Even on an auto, where it may never
be used.

How does that work for cars with electric handbrakes?

--
David Taylor

On Fri, 13 Sep 2013 11:27:13 UTC, David Taylor
wrote:

On 2013-09-12, Dave Plowman (News) wrote:
In article ,
charles wrote:
'Had to be'? I don't think that handbrakes have ever been much use as
an emergency brake.

In the days when SWMBO had a Mini (late 70s), the MOT test included the
stopping power of the hand brake.

It still does - and always has done. Even on an auto, where it may never
be used.

How does that work for cars with electric handbrakes?


There is still a manual switch - Although I think that one cannot do
handbrake turns :-) On my Citroen it would seem that over a certain
speed it does not apply as shortly after we had the car my wife pulled
it on trying to open the arm rest without looking - nothing happened
IIRC - we were on a motorway at the time.

--
Regards
Dave Saville

In article , Bill Wright
wrote:
Phil Cook wrote:
On 10/09/2013 20:42, Bill Wright wrote:
Phil Cook wrote:
On 10/09/2013 18:41, Scott wrote:
On Mon, 09 Sep 2013 17:10:28 -0500, "Steve Thackery"


Surely the propagation delays on FM would be the same as AM?

No, they're much shorter waves. Think about a sausage dog running.

They may be shorter waves but they come much more often so the speed
over the ground is the same, round about C if my physics doesn't fail
me.

It doesn't make any difference how often they come.

Actually, it may. Two reasons occurred to me when I read the above.

1) The refractive index of air tends to rise with frequency though the
range up to about 30GHz. So FM will propagate though the air at a slightly
lower velocity than LF.

2) Near the ground the waves may also be slowed down by the ground
impedance. I'd expect LF to extend further into the ground.

I'd assume both effects are pretty small in this context. But I've never
actually worked out any of the delays for FM v LF.


Just because there are a lot of sausage dogs arriving that doesn't mean
they're coming any faster. It's just that a lot are setting off so more
arrive. Obviously you need more Pedigree Chum.

And what's this 'C' of which you speak? I know that lower case c =
186282 sausage dogs per second, but I've never heard of 'C' (except I
was in the C stream for maths).

I thought he mean 'C', the programming language. As per the maxim. " Worse
things happen in 'C' " which is well known to programmers... :-)

Slainte,

Jim

--
Please use the address on the audiomisc page if you wish to email me.
Electronics http://www.st-and.ac.uk/~www_pa/Scot...o/electron.htm
Armstrong Audio http://www.audiomisc.co.uk/Armstrong/armstrong.html
Audio Misc http://www.audiomisc.co.uk/index.html

In article , Jim Lesurf
scribeth thus
In article , Bill Wright
wrote:
Phil Cook wrote:
On 10/09/2013 20:42, Bill Wright wrote:
Phil Cook wrote:
On 10/09/2013 18:41, Scott wrote:
On Mon, 09 Sep 2013 17:10:28 -0500, "Steve Thackery"


Surely the propagation delays on FM would be the same as AM?

No, they're much shorter waves. Think about a sausage dog running.

They may be shorter waves but they come much more often so the speed
over the ground is the same, round about C if my physics doesn't fail
me.

It doesn't make any difference how often they come.

Actually, it may. Two reasons occurred to me when I read the above.

1) The refractive index of air tends to rise with frequency though the
range up to about 30GHz. So FM will propagate though the air at a slightly
lower velocity than LF.

2) Near the ground the waves may also be slowed down by the ground
impedance. I'd expect LF to extend further into the ground.

I'd assume both effects are pretty small in this context. But I've never
actually worked out any of the delays for FM v LF.

Those delays will be in the noise compared to the digital distribution
delays Jim, all that coding and decoding and digital propagation delays
etc...



--
Tony Sayer