Speed Limit?

Bill Davidson said:

minnesota.twins.mlb.commin ballparkOpen ↗ _history.jsp

the stadium has an interior volume of 60 million cubic feet and is covered by 10 acres of
Teflon-coated fiberglass 1/32" thick. It is 195 feet from the highest point of the interior
ceiling to the playing field.

By my very rough calculation, the pressure difference required to hold up the roof would be
equivalent to an elevation change of about 130 feet.

Quoted message said:

It takes 250,000 cubic feet of air pressure per minute to keep the roof inflated.

That's a lot of air. They should keep the doors closed so the place doesn't leak so much. And invest
in some good weatherstripping and caulk. And read up on the difference between volume and pressure.

--
Ray Heindl (remove the X to reply)

Ray Heindl <[email hidden]> wrote:
: That's a lot of air. They should keep the doors closed so the place doesn't leak so much. And
: invest in some good weatherstripping and caulk. And read up on the difference between volume and
: pressure.

they do keep the doors closed. when you leave the metrodome you are quite literally pushed out by a
wind that's enough to mess up anyone's hair. it's hard to guess but i'd say 15 to 20mph. but it has
been years since i went to a game there.

they used to have rollerblading in the winter. i would've like cycling, but oh well. i would also
have liked the blaine velodrome to have been indoors.
--
david reuteler [email hidden]

David Reuteler said:

Ray Heindl <[email hidden]> wrote:
: That's a lot of air. They should keep the doors closed so the place doesn't leak so much. And
: invest in some good weatherstripping and caulk. And read up on the difference between volume and
: pressure.

they do keep the doors closed. when you leave the metrodome you are quite literally pushed out by
a wind that's enough to mess up anyone's hair. it's hard to guess but i'd say 15 to 20mph. but it
has been years since i went to a game there.

If all the air went through a single door it would be around 150 mph. So I guess it's a good thing
they have more than one door.

--
Ray Heindl (remove the Xs to reply)

Ray Heindl said:

Quoted message said:

: That's a lot of air. They should keep the doors closed so the place doesn't leak so much. And
: invest in some good weatherstripping and caulk. And read up on the difference between volume and
: pressure.

they do keep the doors closed. when you leave the metrodome you are quite literally pushed out by
a wind that's enough to mess up anyone's hair. it's hard to guess but i'd say 15 to 20mph. but it
has been years since i went to a game there.

If all the air went through a single door it would be around 150 mph. So I guess it's a good thing
they have more than one door.

I'm surprised that such a place doesn't have revolving doors. That would seem to be a better way to
keep pressure in. There is a local driving range that is enclosed in a big, air-pressure-supported
bubble. They use revolving doors.
--
Rick Onanian

Rick Onanian <[email hidden]> wrote in message
news:<[email hidden]>...

Quoted message said:

Ray Heindl said:

Quoted message said:

: That's a lot of air. They should keep the doors closed so the place doesn't leak so much. And
: invest in some good weatherstripping and caulk. And read up on the difference between volume
: and pressure.

they do keep the doors closed. when you leave the metrodome you are quite literally pushed out
by a wind that's enough to mess up anyone's hair. it's hard to guess but i'd say 15 to 20mph.
but it has been years since i went to a game there.

If all the air went through a single door it would be around 150 mph. So I guess it's a good
thing they have more than one door.

I'm surprised that such a place doesn't have revolving doors. That would seem to be a better way
to keep pressure in. There is a local driving range that is enclosed in a big,
air-pressure-supported bubble. They use revolving doors.

Dear Rick,

A few revolving doors probably work for metering tiny bands of depressed people armed only with
clubs and large handicaps, all used to waiting politely for the next foursome to move on.

But anything less than dozens of revolving doors probably won't work for emitting fifty thousand
infuriated baseball fans, all used to screaming at the umpires and rushing out at the same time to
riot in the streets.

Hell, the baseball fans probably like the wind blast.

Carl Fogel

--On Thursday said:

Rick Onanian <[email hidden]> wrote in message
news:<[email hidden]>...

Quoted message said:

Ray Heindl said:

> : That's a lot of air. They should keep the doors closed so the place doesn't leak so much.
> : And invest in some good weatherstripping and caulk. And read up on the difference between
> : volume and pressure.
>
> they do keep the doors closed. when you leave the metrodome you are quite literally pushed out
> by a wind that's enough to mess up anyone's hair. it's hard to guess but i'd say 15 to 20mph.
> but it has been years since i went to a game there.

If all the air went through a single door it would be around 150 mph. So I guess it's a good
thing they have more than one door.

I'm surprised that such a place doesn't have revolving doors. That would seem to be a better way
to keep pressure in. There is a local driving range that is enclosed in a big,
air-pressure-supported bubble. They use revolving doors.

Dear Rick,

A few revolving doors probably work for metering tiny bands of depressed people armed only with
clubs and large handicaps, all used to waiting politely for the next foursome to move on.

But anything less than dozens of revolving doors probably won't work for emitting fifty thousand
infuriated baseball fans, all used to screaming at the umpires and rushing out at the same time to
riot in the streets.

Hell, the baseball fans probably like the wind blast.

Carl Fogel

There are plenty of major stadiums that use revolving doors to eject people from domes. And there
are revolving doors that fit more than 4 people. Like the ones in swanky east-coast hotels, that
will take like 5 people per compartment.

Mike Mechanical Engineering 2006, Carnegie Mellon University Remove nospam to reply.

Prometheus <[email hidden]> wrote in message
news:<[email hidden]>...

Quoted message said:

--On Thursday said:

Rick Onanian <[email hidden]> wrote in message
news:<[email hidden]>...

Quoted message said:

On Wed, 05 Nov 2003 22:20:27 -0000, Ray Heindl <[email hidden]> wrote:
>> : That's a lot of air. They should keep the doors closed so the place doesn't leak so much.
>> : And invest in some good weatherstripping and caulk. And read up on the difference between
>> : volume and pressure.
>>
>> they do keep the doors closed. when you leave the metrodome you are quite literally pushed
>> out by a wind that's enough to mess up anyone's hair. it's hard to guess but i'd say 15 to
>> 20mph. but it has been years since i went to a game there.
>
> If all the air went through a single door it would be around 150 mph. So I guess it's a good
> thing they have more than one door.

I'm surprised that such a place doesn't have revolving doors. That would seem to be a better
way to keep pressure in. There is a local driving range that is enclosed in a big,
air-pressure-supported bubble. They use revolving doors.

Dear Rick,

A few revolving doors probably work for metering tiny bands of depressed people armed only with
clubs and large handicaps, all used to waiting politely for the next foursome to move on.

But anything less than dozens of revolving doors probably won't work for emitting fifty thousand
infuriated baseball fans, all used to screaming at the umpires and rushing out at the same time
to riot in the streets.

Hell, the baseball fans probably like the wind blast.

Carl Fogel

There are plenty of major stadiums that use revolving doors to eject people from domes. And there
are revolving doors that fit more than 4 people. Like the ones in swanky east-coast hotels, that
will take like 5 people per compartment.

Mike Mechanical Engineering 2006, Carnegie Mellon University Remove nospam to reply.

Dear Mike,

I stand corrected, and rightly so. To my horror, I realize that I've never been to a dome--only to
outdoor ballparks. So flaunting my ignorance has once again broadened my horizons--thanks for your
tactfully phrased correction, which spared my embarrassed blushes.

Still, I'm not sure that I want to get into a revolving door with a mob of baseball fans, all trying
to beat each other out of the stadium to the parking lot. Maybe I'll try it at one of those driving
ranges and practice trampling a few smaller people first before trying out for the big leagues.

I did enjoy your brisk engineering phrase about using revolving doors "to eject people from domes."

Thanks,

Carl Fogel

Carl Fogel <[email hidden]> wrote:
: But anything less than dozens of revolving doors probably won't work for emitting fifty thousand
: infuriated baseball fans, all used to screaming at the umpires and rushing out at the same time to
: riot in the streets.

heh. the minnesota twins *WISH* they had 50,000 infuriated fans leaving the metrodome at one time.
i'd suspect more like 7 to 10,000.

IIRC, they do have revolving doors. but there are also regular doors and every so often someone
would open one and it would of course stay open.

please. being minnesota no ones so much screams at the umpire as makes strong suggestions. riot in
the street? in minneapolis? maybe burn a few wooden horses to stay warm.
--
david reuteler [email hidden]

Prometheus said:

There are plenty of major stadiums that use revolving doors to eject people from domes. And there
are revolving doors that fit more than 4 people. Like the ones in swanky east-coast hotels, that
will take like 5 people per compartment.

You know, I didn't even consider huge revolving doors...but that would work. I went through a
revolving door somewhere (probably a swanky east coast hotel 😉 that was big enough for those mech
warriors from The Matrix... I had a tough time trying to push it with my 200 pounds. I imagine
smaller people have to go through as teams, or there's a power assist that I didn't notice.

Quoted message said:

Mike Mechanical Engineering 2006, Carnegie Mellon University Remove nospam to reply.

--
Rick Onanian