747 firebomber web site

http://tinyurl.com/2ejag

96 tons of water!!!!!

"Leadfoot" wrote in message
news:Chpqc.69469$Fl5.45597@okepread04...
http://tinyurl.com/2ejag

96 tons of water!!!!!




How would you maintain the cog within stability requirements during a full
offload? Short bursts followed by redistributing what remains, or a full
dump feed from a central wing box/fuselage tank?

Has this much been dropped by another aircraft, if so how'd they manage it?
Was it a dedicated aircraft, designed from day one to have such a
capability?

Jim

"Jim Doyle" wrote in message
news

"Leadfoot" wrote in message
news:Chpqc.69469$Fl5.45597@okepread04...
http://tinyurl.com/2ejag

96 tons of water!!!!!




How would you maintain the cog within stability requirements during a full
offload? Short bursts followed by redistributing what remains, or a full
dump feed from a central wing box/fuselage tank?

The 747-400 initial flight test COG test was done with a water ballast
system. When the engineers wanted to try a differnt COG in flight they just
pumped water to where they needed it. Sure beats the old method of having
flight test techs move sand bags around They never dumped any of the water
during flight test to my knowledge but I'm sure they used a lot of the
experience gained in this project



Has this much been dropped by another aircraft, if so how'd they manage
it?
Was it a dedicated aircraft, designed from day one to have such a
capability?

Its a classic version of the 747 which Boeing stopped making in 1990.


Jim

"Jim Doyle" wrote...

How would you maintain the cog within stability requirements during a full
offload? Short bursts followed by redistributing what remains, or a full
dump feed from a central wing box/fuselage tank?

Or dump from multiple tanks, approximately symmetric about the CG.

Leadfoot wrote:

96 tons of water!!!!!

The hell with that, how about 400' AGL and only 140 KIAS?


BUFDRVR

"Stay on the bomb run boys, I'm gonna get those bomb doors open if it harelips
everyone on Bear Creek"

96 tons of water!!!!!

The hell with that, how about 400' AGL and only 140 KIAS?


BUFDRVR

We were a heck of a lot lower in the C-54 on our drops..I think with the
pressuization system, they plan on dropping higher, but it will be hard to be
precise at all, or go into canyons.

The 747 will be good for a deluge from around 600-800 AGL, but its going to
be a deluge, and not something that will be precise or that you can do with the
"grubbies" nearby


Ron
Tanker 65, C-54E (DC-4)
Silver City Tanker Base

Carpet Water Bombing?

Jack

"Ron" wrote in message
...
96 tons of water!!!!!

The hell with that, how about 400' AGL and only 140 KIAS?


BUFDRVR

We were a heck of a lot lower in the C-54 on our drops..I think with the
pressuization system, they plan on dropping higher, but it will be hard to
be
precise at all, or go into canyons.

The 747 will be good for a deluge from around 600-800 AGL, but its going
to
be a deluge, and not something that will be precise or that you can do
with the
"grubbies" nearby


Ron
Tanker 65, C-54E (DC-4)
Silver City Tanker Base

Carpet Water Bombing?


Like a 400,000 pound cow, ****in' on a flat rock.

"Surrender now, or the next load is going to be pig urine, headed for Falluja!"

Ron wrote:

96 tons of water!!!!!

The hell with that, how about 400' AGL and only 140 KIAS?


BUFDRVR

We were a heck of a lot lower in the C-54 on our drops..I think with the
pressuization system, they plan on dropping higher, but it will be hard to be
precise at all, or go into canyons.

The 747 will be good for a deluge from around 600-800 AGL, but its going to
be a deluge, and not something that will be precise or that you can do with the
"grubbies" nearby


i know its an old thread, but why not? The Martin Mars can drop 7200 gallons in one
go. You
don't need to be precise with that sorta load. And have you seen a mars? They make
the C-54 look
small.

i know its an old thread, but why not? The Martin Mars can drop 7200 gallons
in one
go. You
don't need to be precise with that sorta load. And have you seen a mars? They
make
the C-54 look
small.

Martin Mars drops water on a fire, which is different than dropping retardant
along the flanks and head of the fire.

Precision is often needed because of working in close proximity to ground
resources. The Mars drops a lot of water on hot areas of the fire. Its just a
different kind of resource than a retardant dropping tanker.

A 747 tanker can have a role, but a big part of forest fire suppression is
about getting there soon with aircraft based nearby, rather than having to send
aircraft from across the country



Ron
Tanker 65, C-54E (DC-4)
Silver City Tanker Base