J79 Low Base-Drag Nozzle🧵
I see the J79 & B-58 as being made for each other, even though it might not look as so, when considering that the XJ79 first ran on 8 June 1954, and the XB-58 first flew on 11 November 1956. But the J79 was indeed meant to be, since inception, the B-58's engine.
I see the J79 & B-58 as being made for each other, even though it might not look as so, when considering that the XJ79 first ran on 8 June 1954, and the XB-58 first flew on 11 November 1956. But the J79 was indeed meant to be, since inception, the B-58's engine.
November 1, 2025 at 8:21 PM
J79 Low Base-Drag Nozzle🧵
I see the J79 & B-58 as being made for each other, even though it might not look as so, when considering that the XJ79 first ran on 8 June 1954, and the XB-58 first flew on 11 November 1956. But the J79 was indeed meant to be, since inception, the B-58's engine.
I see the J79 & B-58 as being made for each other, even though it might not look as so, when considering that the XJ79 first ran on 8 June 1954, and the XB-58 first flew on 11 November 1956. But the J79 was indeed meant to be, since inception, the B-58's engine.
"F-102 but with solid state sparrows and a J57 with J79 power" is so fucking blursed but I kinda love it
January 16, 2026 at 3:23 AM
"F-102 but with solid state sparrows and a J57 with J79 power" is so fucking blursed but I kinda love it
Famous momo panauti फेमस मःमः; HGP7+J79, Panauti 45209, Nepal https://www.google.com/maps/search/?api=1&query=27.5865259%2C85.513249&query_place_id=ChIJ4Qa_DbEO6zkROb4TgLIapw0
March 20, 2024 at 10:06 AM
Famous momo panauti फेमस मःमः; HGP7+J79, Panauti 45209, Nepal https://www.google.com/maps/search/?api=1&query=27.5865259%2C85.513249&query_place_id=ChIJ4Qa_DbEO6zkROb4TgLIapw0
▪▪ General Electric J79 ▪▪
First the F-4J Blk.26-27 with J79-GE-8 and F-4J Blk.28+ with J79-GE-10. The General Electric J79 has a feature called "T2 reset".
T2: compressor inlet temperature (CIT).
First the F-4J Blk.26-27 with J79-GE-8 and F-4J Blk.28+ with J79-GE-10. The General Electric J79 has a feature called "T2 reset".
T2: compressor inlet temperature (CIT).
October 3, 2025 at 1:50 PM
▪▪ General Electric J79 ▪▪
First the F-4J Blk.26-27 with J79-GE-8 and F-4J Blk.28+ with J79-GE-10. The General Electric J79 has a feature called "T2 reset".
T2: compressor inlet temperature (CIT).
First the F-4J Blk.26-27 with J79-GE-8 and F-4J Blk.28+ with J79-GE-10. The General Electric J79 has a feature called "T2 reset".
T2: compressor inlet temperature (CIT).
We do see one pattern emerging. Most J79-GE-10/17 powered Phantoms (F-4J/E) do comparatively better the higher the altitude. It seems that the later J79 versions gave the heavier F-4J/E/S, improved turn rates at higher altitudes compared to the lighter F-4B/C/D/Ns with J79-GE-8/15.
June 28, 2025 at 7:28 PM
We do see one pattern emerging. Most J79-GE-10/17 powered Phantoms (F-4J/E) do comparatively better the higher the altitude. It seems that the later J79 versions gave the heavier F-4J/E/S, improved turn rates at higher altitudes compared to the lighter F-4B/C/D/Ns with J79-GE-8/15.
holy shit it makes the J79 look advanced by comparison, it's using the back end of a CF6 as HPT stage 1
also where the fuck is the CDN
also where the fuck is the CDN
September 6, 2026 at 4:17 PM
holy shit it makes the J79 look advanced by comparison, it's using the back end of a CF6 as HPT stage 1
also where the fuck is the CDN
also where the fuck is the CDN
The XB-58, or YB-58 (aircraft № 1, tail number 5660), first flew on November 11, 1956, made at the Convair plant in Fort Worth, Texas. At this stage, it was without a belly-pod, tail gun, and was equipped with the J79-GE-1 instead of the J79-GE-5.
October 31, 2025 at 9:08 AM
The XB-58, or YB-58 (aircraft № 1, tail number 5660), first flew on November 11, 1956, made at the Convair plant in Fort Worth, Texas. At this stage, it was without a belly-pod, tail gun, and was equipped with the J79-GE-1 instead of the J79-GE-5.
You know what? Fuck you. *unstables your Tigershark*
August 13, 2026 at 7:12 PM
You know what? Fuck you. *unstables your Tigershark*
You can calculate total air temperature using the formula: T₂=T₁×(1+0.2×M²)
T₂ - total air temperature (Kelvin)
T₁ - static air temperature (Kelvin)
H=11 km, t=-56.5 °C (T=216.65K)
ATAR 9K50: M=2.10; t=135 °C
J79: M=2.00; t=121 °C
J79: M=2.40; t=193 °C
R35: M=2.50; t=215 °C
D-30F6: M=2.83; t=290 °C
T₂ - total air temperature (Kelvin)
T₁ - static air temperature (Kelvin)
H=11 km, t=-56.5 °C (T=216.65K)
ATAR 9K50: M=2.10; t=135 °C
J79: M=2.00; t=121 °C
J79: M=2.40; t=193 °C
R35: M=2.50; t=215 °C
D-30F6: M=2.83; t=290 °C
October 3, 2025 at 5:41 PM
You can calculate total air temperature using the formula: T₂=T₁×(1+0.2×M²)
T₂ - total air temperature (Kelvin)
T₁ - static air temperature (Kelvin)
H=11 km, t=-56.5 °C (T=216.65K)
ATAR 9K50: M=2.10; t=135 °C
J79: M=2.00; t=121 °C
J79: M=2.40; t=193 °C
R35: M=2.50; t=215 °C
D-30F6: M=2.83; t=290 °C
T₂ - total air temperature (Kelvin)
T₁ - static air temperature (Kelvin)
H=11 km, t=-56.5 °C (T=216.65K)
ATAR 9K50: M=2.10; t=135 °C
J79: M=2.00; t=121 °C
J79: M=2.40; t=193 °C
R35: M=2.50; t=215 °C
D-30F6: M=2.83; t=290 °C
For their part in designing the J79, Gerhard Neumann & Neil Burgess of General Electric Aircraft Engines were jointly awarded the Collier Trophy in 1958.
November 1, 2025 at 11:14 PM
For their part in designing the J79, Gerhard Neumann & Neil Burgess of General Electric Aircraft Engines were jointly awarded the Collier Trophy in 1958.
It really is a generation behind the others, more comparable to the J79-GE-17 (T/W=4.65). But the J79 at least has a much lower SFC in military, 0.84 versus 0.98 kg/kgf•h for the 9K50.
You can compare the engines 👇🏻
Soviet jet engines.
You can compare the engines 👇🏻
Soviet jet engines.
September 18, 2025 at 2:05 PM
It really is a generation behind the others, more comparable to the J79-GE-17 (T/W=4.65). But the J79 at least has a much lower SFC in military, 0.84 versus 0.98 kg/kgf•h for the 9K50.
You can compare the engines 👇🏻
Soviet jet engines.
You can compare the engines 👇🏻
Soviet jet engines.
I convinced my teacher to let me build this in art class.
May 27, 2025 at 9:07 PM
I convinced my teacher to let me build this in art class.
And I know you're wondering... yes, this is the nozzle design that gave the J79 that characteristic howl.
Video from spencergeorge6469 on YouTube.
Video from spencergeorge6469 on YouTube.
November 1, 2025 at 9:41 PM
And I know you're wondering... yes, this is the nozzle design that gave the J79 that characteristic howl.
Video from spencergeorge6469 on YouTube.
Video from spencergeorge6469 on YouTube.
Very few jet engines had integral secondary variable exhaust nozzles in the 50s. Notable exceptions being the Atar 9C through Atar 9K50, and the General Electric J79 series, like this J79-GE-5 used on the Convair B-58.
a close up of a jet engine on a jet .
ALT: a close up of a jet engine on a jet .
media.tenor.com
January 31, 2025 at 3:15 PM
Very few jet engines had integral secondary variable exhaust nozzles in the 50s. Notable exceptions being the Atar 9C through Atar 9K50, and the General Electric J79 series, like this J79-GE-5 used on the Convair B-58.
Visit the Aries team at workstation number 4 in Hall 4.1 J79 during the upcoming @buchmesse.de! #fbm26
September 25, 2026 at 1:35 PM
Visit the Aries team at workstation number 4 in Hall 4.1 J79 during the upcoming @buchmesse.de! #fbm26
The "indigenous" fighter jet that Israel "built" for a while, the IAI Kfir, was built with French technical data for the Dassault Mirage V and used license-built General Electric J79 engines.
The cancelled Lavi project used a Pratt & Whitney engine.
The cancelled Lavi project used a Pratt & Whitney engine.
The reason for this is that in the 21st century, air power remains king, and a country that is capable of designing and manufacturing its own fighter jet engines has the design talent and industrial base to do the same for any other key military component, and can achieve total self-sufficiency.
My entirely subjective quality for being a "great military power" is "do you currently manufacture a high-performance combat jet engine of your own design?"
Therefore the US, PRC, France, and Russia are the only countries on this list.
Therefore the US, PRC, France, and Russia are the only countries on this list.
August 31, 2025 at 10:36 PM
The "indigenous" fighter jet that Israel "built" for a while, the IAI Kfir, was built with French technical data for the Dassault Mirage V and used license-built General Electric J79 engines.
The cancelled Lavi project used a Pratt & Whitney engine.
The cancelled Lavi project used a Pratt & Whitney engine.
Been flying the F-4E in DCS recently and wow.. its a REALLY cool jet. The J79 has to be one of the coolest sounding jet engines ever.
August 12, 2025 at 11:26 PM
Been flying the F-4E in DCS recently and wow.. its a REALLY cool jet. The J79 has to be one of the coolest sounding jet engines ever.
Acceleration Time Curves at H=35,000 ft
Lockheed F-104A with J79-GE-19 engine.
Effect of aircraft weight (varying internal fuel amount) on supersonic acceleration time.
Lockheed F-104A with J79-GE-19 engine.
Effect of aircraft weight (varying internal fuel amount) on supersonic acceleration time.
September 7, 2026 at 12:52 PM
Acceleration Time Curves at H=35,000 ft
Lockheed F-104A with J79-GE-19 engine.
Effect of aircraft weight (varying internal fuel amount) on supersonic acceleration time.
Lockheed F-104A with J79-GE-19 engine.
Effect of aircraft weight (varying internal fuel amount) on supersonic acceleration time.
This piece of crap will never fly unless we strap on a monster gas guzzling engine
J79, "You rang?"
J79, "You rang?"
September 16, 2026 at 9:54 PM
This piece of crap will never fly unless we strap on a monster gas guzzling engine
J79, "You rang?"
J79, "You rang?"
Hoy estoy de paso por la facultad, pero la visita a este bicho era una obligación...
📸 Motor General Electric J79, perteneciente a un avión F-4C Phantom II del ejército del aire, expuesto en la escuela de ingenierías de la universidad de León.
📸 Motor General Electric J79, perteneciente a un avión F-4C Phantom II del ejército del aire, expuesto en la escuela de ingenierías de la universidad de León.
October 14, 2025 at 5:26 PM
Hoy estoy de paso por la facultad, pero la visita a este bicho era una obligación...
📸 Motor General Electric J79, perteneciente a un avión F-4C Phantom II del ejército del aire, expuesto en la escuela de ingenierías de la universidad de León.
📸 Motor General Electric J79, perteneciente a un avión F-4C Phantom II del ejército del aire, expuesto en la escuela de ingenierías de la universidad de León.
F-4B Phantom II.
The fastest operational Phantom, the early F-4B, with J79-GE-8 engines, and 4 belly mounted Sparrows, Mach 2.25.
The fastest operational Phantom, the early F-4B, with J79-GE-8 engines, and 4 belly mounted Sparrows, Mach 2.25.
January 22, 2025 at 8:15 PM
F-4B Phantom II.
The fastest operational Phantom, the early F-4B, with J79-GE-8 engines, and 4 belly mounted Sparrows, Mach 2.25.
The fastest operational Phantom, the early F-4B, with J79-GE-8 engines, and 4 belly mounted Sparrows, Mach 2.25.
Talks between Convair Fort Worth & General Electric were already taking place in January 1953, for the application of MX2118 (J79) on the MX-1964 (B-58). This was just shortly after the USAF gave the go-ahead for project MX2118 in December 1952.
November 1, 2025 at 8:23 PM
Talks between Convair Fort Worth & General Electric were already taking place in January 1953, for the application of MX2118 (J79) on the MX-1964 (B-58). This was just shortly after the USAF gave the go-ahead for project MX2118 in December 1952.
Klassiek Restaurant and Bar; Police Park, Jubilee Park, C536+J79, Tamale, Ghana https://www.google.com/maps/search/?api=1&query=9.4040489%2C-0.8392639&query_place_id=ChIJT1kg1UI91A8R9bhab8871-k
September 13, 2023 at 11:34 PM
Klassiek Restaurant and Bar; Police Park, Jubilee Park, C536+J79, Tamale, Ghana https://www.google.com/maps/search/?api=1&query=9.4040489%2C-0.8392639&query_place_id=ChIJT1kg1UI91A8R9bhab8871-k