Safety first

GGJaguar

Reverential Member
Joined
Jan 17, 2011
Messages
22,125
Reaction score
32,593
Location
Skylands
Guild Total
50
1696245308875.png
 

davismanLV

Venerated Member
Joined
Mar 24, 2011
Messages
19,427
Reaction score
12,346
Location
U.S.A. : Nevada : Las Vegas
Guild Total
2
This is some of the stuff crazy horses do! Get into situations without a thought towards how they're gonna UNDO it.... I suppose you can back him up and then hope the entrance was on ground level on that side. Otherwise backing down stairs? They don't do that well at all!! :oops::rolleyes:
 

fronobulax

Bassist, GAD and the Hot Mess Mods
Joined
May 3, 2007
Messages
24,792
Reaction score
8,923
Location
Central Virginia, USA
Guild Total
5
How he got up that ladder is the real mystery.

plus other sources.

The most plausible answer, IMO, is that there are stairs that were used but are not in the picture and that the horse did not use the ladder :)
 

JohnW63

Enlightened Member
Joined
Dec 11, 2012
Messages
6,338
Reaction score
2,245
Location
Southern California
Guild Total
4
What's going on in the horses head right now....?

Mmmm. That grass way over there looks tasty.
I can see my stall from here!
Hey! The guy said there was a water slide up here!
 

adorshki

Reverential Member
Joined
Aug 21, 2009
Messages
34,176
Reaction score
6,800
Location
Sillycon Valley CA
I love Google Quora, thanks to Chris Judge, retired engineer of 50 yeas in Whaley Bridge, Great Britain, by way of crediting the source ;) :
If the top deck of a double decker London bus is completely filled with 220 pound people and there’s nobody downstairs, will it become dangerously top-heavy?

"The centre of gravity of an unloaded double-decker Optare bus is very low. It has 16 seats on the top deck. If they were all taken by 16 stone passengers then the extra weight on the top deck would be 1.6 tonnes. The kerb weight of the bus is 7.5 tonnes (7.35 long tons, 8.23 short tons). The bus is 14′5″ high (4.4m) the upper deck is 8′6″ (2.6m) above the kerb. The seats are 3ft (0.91m) above the upper deck The extra tilting moment of having the upper deck full of 16 stone passengers is thus:

(2.6 +0.91) x 1.6 x 1000 x g (9.81) = 55,000 Nm

The mass of the bus is 7.5 x 1000 x 9.81 = 74,000 N

Therefore the extra sitting passengers could tilt the bus 55/74 = 0.733 m (2′5″)

This is insufficient to tip the bus over. In fact the safety factor is 6/2.5 = 2.2

On a double decker bus tip test, it has to withstand a lean-out of 6 feet (1.8m). This is over twice the tilting moment caused by a deck full of sitting 20 stone passengers.

main-qimg-56e0fffaed7df082311a2112ed47e86c

Now if you could get them all to stand up - it might be different."

And that, my friends, is safety at its finest.



And now I finally know why Count Five loved Double Decker Busses. Been wondering ever since 6th grade. Almost wore out the vinyl. Local San Jose band, y'know. :cool:
 

Prince of Darkness

Senior Member
Joined
Feb 17, 2018
Messages
3,609
Reaction score
9,593
Location
Boddam, North East Scotland.
Guild Total
2
I love Google Quora, thanks to Chris Judge, retired engineer of 50 yeas in Whaley Bridge, Great Britain, by way of crediting the source ;) :
If the top deck of a double decker London bus is completely filled with 220 pound people and there’s nobody downstairs, will it become dangerously top-heavy?

"The centre of gravity of an unloaded double-decker Optare bus is very low. It has 16 seats on the top deck. If they were all taken by 16 stone passengers then the extra weight on the top deck would be 1.6 tonnes. The kerb weight of the bus is 7.5 tonnes (7.35 long tons, 8.23 short tons). The bus is 14′5″ high (4.4m) the upper deck is 8′6″ (2.6m) above the kerb. The seats are 3ft (0.91m) above the upper deck The extra tilting moment of having the upper deck full of 16 stone passengers is thus:

(2.6 +0.91) x 1.6 x 1000 x g (9.81) = 55,000 Nm

The mass of the bus is 7.5 x 1000 x 9.81 = 74,000 N

Therefore the extra sitting passengers could tilt the bus 55/74 = 0.733 m (2′5″)

This is insufficient to tip the bus over. In fact the safety factor is 6/2.5 = 2.2

On a double decker bus tip test, it has to withstand a lean-out of 6 feet (1.8m). This is over twice the tilting moment caused by a deck full of sitting 20 stone passengers.

main-qimg-56e0fffaed7df082311a2112ed47e86c

Now if you could get them all to stand up - it might be different."

And that, my friends, is safety at its finest.



And now I finally know why Count Five loved Double Decker Busses. Been wondering ever since 6th grade. Almost wore out the vinyl. Local San Jose band, y'know. :cool:

This test is far from new. I have not been able to find out when it was introduced, but it was certainly in use by the early 1930s (and I think long before).
1696575693648.png
In order to pass, the bus has to be capable of being tilted to angle of greater than 28 degrees with all wheels maintaining contact.
 
Top