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TreadHead
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Posted: Dec 13, 2010 - 01:49 PM
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Newbie

Joined: Dec 09, 2010 - 06:07 PM
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How exactly does an F-16 pilot drop his drop-tanks?
I know that the F-15 for example has a jettison selector which is set to "tanks", and the button is pushed, bye bye tanks.
The F-4, I'm told, had a similar system, but you also had to slow down to a certain speed before releasing the centerline tank or it could strike the aircraft and damage the underside.
The only jettison buttons I'm familiar with for the F-16 are the ones modeled in Falcon 4.0, the "Get rid of it all!" emergency button, and "Selective Jettison" through the MFD, which seems like an awful clunky way of getting rid of drop-tanks in an emergency? So, is there a dedicated drop-tank button, and are there any speed restrictions on getting rid of the various types of tanks? |
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Posted: May 22, 2013 - 12:24 AM
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F-16.net Sponsor
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exfltsafety
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Posted: Dec 13, 2010 - 04:40 PM
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Senior member

Joined: Aug 05, 2009 - 08:11 PM
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| There is an emergency jettison button that is depressed when the pilot wants to get rid of all jettisonable stores and racks, including tanks. Selective jettison is set up through the MFD like you mentioned. It's used to jettison the selected store, rack, or tank. Selective jettison is typically used for certain hung live ordnance situations. However, it is also useful in an emergency if the pilot has a situation where getting rid of only one external tank will aid in roll control. Speed restrictions for jettison are published in the stores limitations manual. One country's F-16s also have a selective emergency jettison feature which, if I remember correctly, allows emergency jettison of just the external wing tanks. |
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VprWzl
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Posted: Dec 13, 2010 - 05:37 PM
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Senior member

Joined: Sep 15, 2003 - 04:01 AM
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| It sounds like you've got it right. The MFD Sel Jett function is awkward to use & to set up, but it's all we have if don't want to dump everything jettisonable. |
_________________ Check Six!
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TreadHead
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Posted: Dec 13, 2010 - 06:01 PM
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Newbie

Joined: Dec 09, 2010 - 06:07 PM
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| Man just thinking about that makes me cringe! I'm honestly shocked that there isn't an easy to use button dedicated to getting rid of the tanks should they need to be gotten rid of. I figure that while you might often times want to keep the tanks, on the occasions when you want to get rid of them you probably want to get rid of them ASAP! |
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LinkF16SimDude
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Posted: Dec 13, 2010 - 08:29 PM
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Elite 2K

Joined: Jan 31, 2004 - 07:18 PM
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| If memory serves, if you were going into a situation where punching the tanks could...could...be an option, you could call up the SEL JETT page when doing the pre-launch routine and preselect the tanks. That way if and when the time came to let 'em go, you go right to SEL JETT and press the pickle button. That may have changed since I left the Viper world tho, so don't quote me. |
_________________ Why does "monosyllabic" have 5 syllables?
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outlaw162
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Posted: Dec 14, 2010 - 01:04 AM
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Forum Veteran

Joined: Feb 28, 2008 - 02:33 AM
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TreadHead wrote:
Man just thinking about that makes me cringe! I'm honestly shocked that there isn't an easy to use button dedicated to getting rid of the tanks should they need to be gotten rid of.
Ah, the "Easy button".
Since both a Viper tanks only selective jettison and the F-4 were brought up here…
You know the Phantom had a “tanks only” jettison red cover guarded hard switch ("easy button") on the left side of the front cockpit that was kind of back out of normal view.
Guess what was right next to it, also out of normal view…
Another obscure, rarely used black cover guarded hard switch that allowed you to air refuel “internal only” if for some odd reason you didn’t need the externals refueled.
One dark and stormy night I lead a night intercept training 4-ship that had an unusually late air refueling time so we did the intercepts first (club would still be open that way). The refueling track was also very close to home. “Self,” I said to myself, “why not have the flight refuel ‘internal only’ using the other "easy button" since we don’t need a bunch of gas.”
So on the way to the tanker, I said to the flight…”Flight, let’s refuel internal only.”
The next thing I heard over the radio was the backseater in the number four aircraft saying:
“There they go.”
Ya gotta be careful what you wish for.
OL
(ego disclaimer: He was referring to number three’s tanks, not mine) |
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deadseal
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Posted: Dec 14, 2010 - 02:36 AM
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Senior member

Joined: Jan 13, 2008 - 01:17 AM
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| Think of it tactically though. If im in an emergency i need to get rid of all my weight. If Im buying a merge or doing a last ditch against a SAM....i need to get rid of all my weight. Otherwise when would you just dop tanks? Theres really no reason where timing would not permit you to take the 6.9 seconds to sel jett them from the mfd. |
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smines80
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Posted: Dec 14, 2010 - 03:30 AM
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Joined: Jan 10, 2007 - 08:53 PM
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deadseal wrote:
Think of it tactically though. If im in an emergency i need to get rid of all my weight. If Im buying a merge or doing a last ditch against a SAM....i need to get rid of all my weight. Otherwise when would you just dop tanks? Theres really no reason where timing would not permit you to take the 6.9 seconds to sel jett them from the mfd.
Not even lose of engine? Might have to dump weight real quick, right? |
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fiskerwad
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Posted: Dec 14, 2010 - 03:58 AM
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Joined: Nov 13, 2004 - 07:43 PM
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exfltsafety wrote:
<SNIP>
One country's F-16s also have a selective emergency jettison feature which, if I remember correctly, allows emergency jettison of just the external wing tanks.
If memory serves, that country re-functioned the NUC consent switch, Sta 5 one direction, Sta 4/6 the other direction. This was in the early 80s so the list of countries with the airplane was very short. Also, the 4/6 position was wired directly to the stations so no delay/separation involved.
The same country was rumored to have a hot gun with NO SMS functioning. They are a VERY results-oriented country.
fisk |
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Guysmiley
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Posted: Dec 14, 2010 - 07:33 AM
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Elite 1K

Joined: May 26, 2005 - 08:39 PM
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smines80 wrote:
deadseal wrote:
Think of it tactically though. If im in an emergency i need to get rid of all my weight. If Im buying a merge or doing a last ditch against a SAM....i need to get rid of all my weight. Otherwise when would you just dop tanks? Theres really no reason where timing would not permit you to take the 6.9 seconds to sel jett them from the mfd.
Not even lose of engine? Might have to dump weight real quick, right?
If you were in a situation where you needed to drop weight/drag NOW, the emergency jettison is what you'd go for. |
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johnwill
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Posted: Dec 14, 2010 - 05:43 PM
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Elite 1K

Joined: Mar 24, 2007 - 09:06 PM
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One problem with Emergency Jett is the speed limit, only 200 kt. Obviously Emer Jett is intended for use right after takeoff or just before landing. Why such a low limit? The cost of certifying thousands of store configurations for Emer Jett at higher speeds was prohibitive. 200 kt was felt to be low enough so that aerodynamic effects on jettisoned stores would not cause store collisions if they all went at once. At higher speeds, take my word for it, almost anything could happen with Emer Jett.
However, in a bad situation, I would not hesitate to use Emer Jett at higher speeds.
With Sel Jett you can punch off the tanks at any speed. Certifying that capability was a fun task, especially at supersonic speeds. |
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Loader2088
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Posted: Dec 14, 2010 - 06:58 PM
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Active Member

Joined: Jul 18, 2007 - 06:43 PM
Posts: 204
Location: Georgia
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deadseal wrote:
Think of it tactically though. If im in an emergency i need to get rid of all my weight. If Im buying a merge or doing a last ditch against a SAM....i need to get rid of all my weight. Otherwise when would you just dop tanks? Theres really no reason where timing would not permit you to take the 6.9 seconds to sel jett them from the mfd.
On a combat mission, wouldn't you want to "clean it up" by dropping the empty tanks before engaging in a potential dogfight, but might want to keep the A-G ordinance? And maybe do it in a hurry if pressing business occurs? |
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TreadHead
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Posted: Dec 14, 2010 - 09:13 PM
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Joined: Dec 09, 2010 - 06:07 PM
Posts: 10
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outlaw162 wrote:
TreadHead wrote:
Man just thinking about that makes me cringe! I'm honestly shocked that there isn't an easy to use button dedicated to getting rid of the tanks should they need to be gotten rid of.
Ah, the "Easy button".
Since both a Viper tanks only selective jettison and the F-4 were brought up here…
You know the Phantom had a “tanks only” jettison red cover guarded hard switch ("easy button") on the left side of the front cockpit that was kind of back out of normal view.
Guess what was right next to it, also out of normal view…
Another obscure, rarely used black cover guarded hard switch that allowed you to air refuel “internal only” if for some odd reason you didn’t need the externals refueled.
One dark and stormy night I lead a night intercept training 4-ship that had an unusually late air refueling time so we did the intercepts first (club would still be open that way). The refueling track was also very close to home. “Self,” I said to myself, “why not have the flight refuel ‘internal only’ using the other "easy button" since we don’t need a bunch of gas.”
So on the way to the tanker, I said to the flight…”Flight, let’s refuel internal only.”
The next thing I heard over the radio was the backseater in the number four aircraft saying:
“There they go.”
Ya gotta be careful what you wish for.
OL
(ego disclaimer: He was referring to number three’s tanks, not mine)
Whoopsie daisy! That sounds like it could potentially be an expensive mistake...Hope they didn't land on anybody?
Out of curiosity, if the easy button for the tanks is down on the back left, then what are the three buttons labeled "EXT. TANKS" located on the rail above and to the left of the HUD, sort of across from the compass?
While we're talking Phantoms (Get ready, I'm a bit of a Phantom Phanatic...) :
How tall can you be and still manage to fit in the front seat? The last time I sat in an F-4 I was looking over the top of the windscreen while seated...
If you know, what year were Chaff/Flare dispensers first added to the F-4, and how many of each did they carry?
When you're carrying multiple rocket pods (LAU-3, etc, 19 shot or 7 shot), how and where can they be racked up on TERs?
Finally (For now) what kind of restrictions are placed on flying the jet (In terms of G's and speeds) with the 370 gal and 600 gal tanks attached? I know of at least one occasion where and F-4 did some seriously hard maneuvering (Related to one of the 370 gallon tanks being hit by VC flak and exploding...) causing a 370 gallon tank (The other one) to be ripped from the wing(!), but have no idea how hard he would have been pulling on the stick.
Loader2088 wrote:
deadseal wrote:
Think of it tactically though. If im in an emergency i need to get rid of all my weight. If Im buying a merge or doing a last ditch against a SAM....i need to get rid of all my weight. Otherwise when would you just dop tanks? Theres really no reason where timing would not permit you to take the 6.9 seconds to sel jett them from the mfd.
On a combat mission, wouldn't you want to "clean it up" by dropping the empty tanks before engaging in a potential dogfight, but might want to keep the A-G ordinance? And maybe do it in a hurry if pressing business occurs?
This is why I'm surprised that there isn't an "Easy button" for the tanks. I would expect that before you got into it with enemy fighters you'd want to kick off empty drop tanks, or perhaps even partial ones, even if you wanted to try to keep your A-G weapons? |
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johnwill
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Posted: Dec 14, 2010 - 09:33 PM
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Elite 1K

Joined: Mar 24, 2007 - 09:06 PM
Posts: 1364
Location: Fort Worth, Texas
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johnwill wrote:
One problem with Emergency Jett is the speed limit, only 200 kt. Obviously Emer Jett is intended for use right after takeoff or just before landing. Why such a low limit? The cost of certifying thousands of store configurations for Emer Jett at higher speeds was prohibitive. 200 kt was felt to be low enough so that aerodynamic effects on jettisoned stores would not cause store collisions if they all went at once. At higher speeds, take my word for it, almost anything could happen with Emer Jett.
However, in a bad situation, I would not hesitate to use Emer Jett at higher speeds.
With Sel Jett you can punch off the tanks at any speed. Certifying that capability was a fun task, especially at supersonic speeds.
Oops, I may have gotten the speed limit wrong. exfltsafety tells me he recalls 300/0.7 as a limit. Maybe someone can look it up. In any event, the limit is lower than most tactical operations, so could be a hindrance. |
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outlaw162
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Posted: Dec 15, 2010 - 03:53 AM
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Forum Veteran

Joined: Feb 28, 2008 - 02:33 AM
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TreadHead wrote:
While we're talking Phantoms (Get ready, I'm a bit of a Phantom Phanatic...) :
How tall can you be and still manage to fit in the front seat? The last time I sat in an F-4 I was looking over the top of the windscreen while seated...
If I recall correctly the front seat was usually left full up prior to leaving the jet. You needed electrical power to lower it. Pilot height was not really an issue then.
I first flew the Phantom in 1980 and I think the ALE-40’s were already on them (on the aft of both inboard pylons). I don’t know when they first got them.
Never fired rockets off a Phantom (F-100 & A-7 yes, but one pod for training only). Rockets were out of favor by then.
I’d need to get my books out of the attic for some of this (370’s were only 6G when they were empty).
For example, tank speed limits I don’t remember…but fast was not as good as faster.
OL
(Fortunately, the tanks landed harmlessly in a farm field.) |
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