C-130 rocket assisted takeoff length

(Peter Stickney) wrote:

In article ,
(George) writes:
Hi all.
Does anyone know C-130 rocket assisted takeoff length?

Is it possible that it can be 30 meters (100 ft)?

Not with a loaded Herc, and the standard JATO setup.

From the Standard Aircraft Characteristics Chart for the U.S. Navy
C-130G (The same thing as a USAF C-130E, but the Navy wouldn't use the
same subtype letter, would they? )

The normal JATO fit are 8 1000-KS-14 JATO bottles, which give you
1000# thrust for 14 seconds.

Takeoff ground run, no wind, Standard Day Sea Level at 155,000# weight
(Max payload)
4125' without JATO, 3565' with HATO
Distance to clear a 50' obstacle:
5810' without JATO, 4812' with JATO.

Note that the extra thrust doesn't help the ground run very much, but
does help the initial climbout quite a bit.

Peter, what did they do to the Herc that they flew off of the
Forrestal(?) ? (without JATO at that!)
--

-Gord.

wrote:

Peter, what did they do to the Herc that they flew off of the
Forrestal(?) ? (without JATO at that!)

Well, it does help with ground run if you can guarantee a 30 kt
wind down the runway every time...

Mike

Michael Williamson
wrote:

wrote:

Peter, what did they do to the Herc that they flew off of the
Forrestal(?) ? (without JATO at that!)

Well, it does help with ground run if you can guarantee a 30 kt
wind down the runway every time...

Mike


That's true isn't it?...one tends to forget that ~30 knots is a
LOT of airspeed gain, especially at the top of the take-off roll
range, takes a comparatevly long time to gather that extra speed.

An a/c that you normally rotate at 105 you now rotate at 75
(well, not really but you get my drift)
--

-Gord.

" wrote:

Michael Williamson
wrote:

wrote:

Peter, what did they do to the Herc that they flew off of the
Forrestal(?) ? (without JATO at that!)

Well, it does help with ground run if you can guarantee a 30 kt
wind down the runway every time...

Mike


That's true isn't it?...one tends to forget that ~30 knots is a
LOT of airspeed gain, especially at the top of the take-off roll
range, takes a comparatevly long time to gather that extra speed.

An a/c that you normally rotate at 105 you now rotate at 75
(well, not really but you get my drift)

There's also the advantage that you don't have to pull G off the end of
the deck, in order to leave the 'ground' and climb over obstacles.
Indeed, you can even sink a bit. And of course, the a/c was almost
certainly nowhere near MTOW -- max. landing weight (8fps) is only
130,000 lb., vice the 155,000 or 175,000 lb. MTOW, and I imagine the
a/c was well under max. landing weight when it landed. The Herc's
power-on stall speeds (100% flaps) at landing weights are under 100
knots. For instance, at a landing weight of 110,459 lb. it has power
off/on stall speeds (100% flaps) of 80/65 kts. At 122,586 lb. they're
91/75 kts. 50% flaps would be used for takeoff, but even with no wind,
at a t/o weight of 100,000 lb. the a/c has a ground run of only 1,500
ft. at sea level. Add 30 kts or more of wind over deck and the Herc's
ability to land or takeoff from a large deck carrier isn't a surprise.

Guy

On Sun, 19 Oct 2003 19:19:11 GMT, Guy Alcala
wrote:

" wrote:

Michael Williamson
wrote:

wrote:

Peter, what did they do to the Herc that they flew off of the
Forrestal(?) ? (without JATO at that!)

Well, it does help with ground run if you can guarantee a 30 kt
wind down the runway every time...

Mike


That's true isn't it?...one tends to forget that ~30 knots is a
LOT of airspeed gain, especially at the top of the take-off roll
range, takes a comparatevly long time to gather that extra speed.

An a/c that you normally rotate at 105 you now rotate at 75
(well, not really but you get my drift)

There's also the advantage that you don't have to pull G off the end of
the deck, in order to leave the 'ground' and climb over obstacles.
Indeed, you can even sink a bit. And of course, the a/c was almost
certainly nowhere near MTOW -- max. landing weight (8fps) is only
130,000 lb., vice the 155,000 or 175,000 lb. MTOW, and I imagine the
a/c was well under max. landing weight when it landed. The Herc's
power-on stall speeds (100% flaps) at landing weights are under 100
knots. For instance, at a landing weight of 110,459 lb. it has power
off/on stall speeds (100% flaps) of 80/65 kts. At 122,586 lb. they're
91/75 kts. 50% flaps would be used for takeoff, but even with no wind,
at a t/o weight of 100,000 lb. the a/c has a ground run of only 1,500
ft. at sea level. Add 30 kts or more of wind over deck and the Herc's
ability to land or takeoff from a large deck carrier isn't a surprise.

Guy

And, if you have a 15 knot wind, you can easily get 45 kts over the
deck. I never asked Adm Flately what the wind conditions were, and I
always regretted it :-(

Al Minyard

Alan Minyard wrote:


And, if you have a 15 knot wind, you can easily get 45 kts over the
deck. I never asked Adm Flately what the wind conditions were, and I
always regretted it :-(

Al Minyard

Yes, must have been fun talking to him about it...pretty
impressive feat.
--

-Gord.

"Gord Beaman" wrote in message
news
Peter, what did they do to the Herc that they flew off of the
Forrestal(?) ? (without JATO at that!)
--

-Gord.

Still around as a USMC KC-130.

Tex

"Tex Houston" wrote:


"Gord Beaman" wrote in message
news
Peter, what did they do to the Herc that they flew off of the
Forrestal(?) ? (without JATO at that!)
--

-Gord.

Still around as a USMC KC-130.

Tex

Oh yes indeed, Quite successful, I have the film clips here,
impressive. Didn't look like it dropped at the end of the deck
either, seemed to be climbing smartly.
--

-Gord.

In article ,
"Gord Beaman" ) writes:
(Peter Stickney) wrote:

In article ,
(George) writes:
Hi all.
Does anyone know C-130 rocket assisted takeoff length?

Is it possible that it can be 30 meters (100 ft)?

Not with a loaded Herc, and the standard JATO setup.

From the Standard Aircraft Characteristics Chart for the U.S. Navy
C-130G (The same thing as a USAF C-130E, but the Navy wouldn't use the
same subtype letter, would they? )

The normal JATO fit are 8 1000-KS-14 JATO bottles, which give you
1000# thrust for 14 seconds.

Takeoff ground run, no wind, Standard Day Sea Level at 155,000# weight
(Max payload)
4125' without JATO, 3565' with HATO
Distance to clear a 50' obstacle:
5810' without JATO, 4812' with JATO.

Note that the extra thrust doesn't help the ground run very much, but
does help the initial climbout quite a bit.

Peter, what did they do to the Herc that they flew off of the
Forrestal(?) ? (without JATO at that!)

Gave it a 40 kt headwind! It should be pointed out that the data I
gave was for a 155,000# C-130G (or E, if you're USAF). The Forrestal
flights wre made by a KC-130F, which was the Marine Corps
Tanker/Transport flavor of the C-130B. The B models had the same
egnine as the later E models, but their max weight was 135,000# rather
than 155,000#.

--
Pete Stickney
A strong conviction that something must be done is the parent of many
bad measures. -- Daniel Webster