why does fighter jets manufacturers make only single and double engines planes?

[jaiind]

Hello all , my doubt is . Why fighter jets manufacturers make only single and double engine planes? Why does they didn't tried to make3 eengine plane? A 3 engine plane will gomore fast, agile, and maneuverable. it will also carry more weapons load for combat. Any senior member could shed some light on this?

 

[Hamartia Antidote]

They just make the other 2 engines slightly bigger.

 

[Superboy]

Due to aerodynamics. In the 1930s, there were twin engine fighters like Me 110 and P-38 and Ki-45. They were found to be lacking in maneuverability and unable to compete with single engine fighters like Me 109 and P-40 and Ki-43.

 

[Indischer]

Hello all , my doubt is . Why fighter jets manufacturers make only single and double engine planes? Why does they didn't tried to make3 eengine plane? A 3 engine plane will gomore fast, agile, and maneuverable. it will also carry more weapons load for combat. Any senior member could shed some light on this?

Speeds don't improve merely by adding another engine. The weight of the aircraft also increases with more engines and subsystems, which increases the necessary on-board fuel to maintain the same range, necessitating a larger airframe. Also, a large airframe isn't usually agile, plus it's radar signature might substantially increase with size. Hence, an optimal trade-off for fighters seems to be a two-engined airframe.

btw, planes like the one you described do exist. We just call them bombers.

 

[Hamartia Antidote]

Due to aerodynamics. In the 1930s, there were twin engine fighters like Me 110 and P-38 and Ki-45. They were found to be lacking in maneuverability and unable to compete with single engine fighters like Me 109 and P-40 and Ki-43.

While the P-38 couldn't roll fast. putting the two engines on the wings allowed the multiple machine guns to be center mounted. That made it exceptionally deadly at long range. No convergence zone needed. General Yamamoto ended up on the wrong end of a P38.

 

[jaiind]

Speeds don't improve merely by adding another engine. The weight of the aircraft also increases with more engines and subsystems, which increases the necessary on-board fuel to maintain the same range, necessitating a larger airframe. Also, a large airframe isn't usually agile, plus it's radar signature might substantially increase with size. Hence, an optimal trade-off for fighters seems to be a two-engined airframe.

btw, planes like the one you described do exist. We just call them bombers.

But bro incase of single engine fighter jet failure there is a very less chance to survive than a 2 engine fighter jet.

 

[Panther 57]

But bro incase of single engine fighter jet failure there is a very less chance to survive than a 2 engine fighter jet.

Fighters planes are risky, therefore, not covered by any insurance company . rightly pointed out by @Indischer that with thrust weight also increases. Lesser engines closer to the fuselage increases maneuverability which is the foremost requirement of fighters. additional engine on wings or on tail will restrict its agility. So when designing fighters a happy compromise on thrust to weight ration, agility, armament carrying capability, weight, airframe design etc are achieved.

 

[Dillinger]

But bro incase of single engine fighter jet failure there is a very less chance to survive than a 2 engine fighter jet.

As far as fighter jets go, as in the maneuverable types which actually happen to be fighter jets and not B-52s, 0 is too small a number and 3 just way too much in terms of engines. That's the simple answer.

 

[jaiind]

Speeds don't improve merely by adding another engine. The weight of the aircraft also increases with more engines and subsystems, which increases the necessary on-board fuel to maintain the same range, necessitating a larger airframe. Also, a large airframe isn't usually agile, plus it's radar signature might substantially increase with size. Hence, an optimal trade-off for fighters seems to be a two-engined airframe.

btw, planes like the one you described do exist. We just call them bombers.

if any one make fighter jet with 3 engines by stealth design,there will be ultimate reduction RCS of a plane. .

 

[500]

Hello all , my doubt is . Why fighter jets manufacturers make only single and double engine planes? Why does they didn't tried to make3 eengine plane? A 3 engine plane will gomore fast, agile, and maneuverable. it will also carry more weapons load for combat. Any senior member could shed some light on this?

Engineers prefer to reduce number of engines: if you can build 1-2 engines better 1, if 2-3 better 2.

Currently power of 2 engines more than enough to power fighter jets.

 

[Indischer]

if any one make fighter jet with 3 engines by stealth design,there will be ultimate reduction RCS of a plane. .

Maybe, but where does the need arise if 2 engines are doing the job just as well? If it's simply speed you seek, the SR-71 and Mig-25 both among the fastest Mil Aircraft till date, were two-engined.

 

[jaiind]

Engineers prefer to reduce number of engines: if you can build 1-2 engines better 1, if 2-3 better 2.

Currently power of 2 engines more than enough to power fighter jets.

but in most of cases like sam attacks on jets could not escape due to its low engine power even after counter measures like using flares. I think a plane having additional engine for 2 engine fighter plane could have a more chance of survive.

Maybe, but where does the need arise if 2 engines are doing the job just as well? If it's simply speed you seek, the SR-71 and Mig-25 both among the fastest Mil Aircraft till date, were two-engined.

but even will get shot down by latest SAMS than earlier generations

 

[Indischer]

but in most of cases like sam attacks on jets could not escape due to its low engine power even after counter measures like using flares. I think a plane having additional engine for 2 engine fighter plane could have a more chance of survive.



but even will get shot down by latest SAMS than earlier generations

And who told you 3 engined planes don't get hit by SAMs?

 

[jaiind]

generally a 2 engine plane will not go more than 2.5 mach,just imagine if a plane have 3 engines will easily exceed mach 3 or more. most of SAMS have speed nearly mach 3 or less.

 

[Panther 57]

but in most of cases like sam attacks on jets could not escape due to its low engine power even after counter measures like using flares. I think a plane having additional engine for 2 engine fighter plane could have a more chance of survive.



but even will get shot down by latest SAMS than earlier generations

IR envelop will increae