frmrCapCadet
Topic Author
Posts: 3082
Joined: Thu May 29, 2008 8:24 pm

Why Two Tails on most New Military Jets?

Sat Aug 31, 2019 2:34 pm

Are there only longish highly technical reasons? My naive observation is that the back end of most of these aircraft rather than tapering close to a point, are squared off like a box, hence needing more vertical tail surface, one on each side.
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GalaxyFlyer
Posts: 3546
Joined: Fri Jan 01, 2016 4:44 am

Re: Why Two Tails on most New Military Jets?

Sat Aug 31, 2019 3:12 pm

The F-18 uses twin tails to create more pitch control by rotating both panels leading edge out. Fighters often work at very high AoA, so need powerful rudders to position the nose in a fight.

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Armadillo1
Posts: 481
Joined: Thu Apr 20, 2017 5:14 pm

Re: Why Two Tails on most New Military Jets?

Sat Aug 31, 2019 6:10 pm

at high AoA single vertical stabiliser is in shadow of fuselage.
for those still with single stabiliser there some extra surface to provide some control at high AoA, but current fighters is a "supermaneuverability" aircraft (actually "supercontrolable") able to do "cobra" and even more complex maneuveres so they need maximum control with fine tune vortexes from leading-edge extension to vertical stabiliers.

on MiG-23, a folding "opposite stabiliser" used.
Image
Image


on F-16, a 2 small surfaces at almost the same place
Image
 
frmrCapCadet
Topic Author
Posts: 3082
Joined: Thu May 29, 2008 8:24 pm

Re: Why Two Tails on most New Military Jets?

Sun Sep 01, 2019 12:40 pm

Thanks for replies and pictures.
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Starlionblue
Posts: 19353
Joined: Fri Feb 27, 2004 9:54 pm

Re: Why Two Tails on most New Military Jets?

Fri Sep 06, 2019 12:43 am

- Two smaller rudders make it easier to fit the aircraft into a cramped carrier hangar deck, especially if you can fold them.
- Additional control authority at high AoA.
- Redundancy if one is damaged in combat.
"There are no stupid questions, but there are a lot of inquisitive idiots." - John Ringo
 
mxaxai
Posts: 1096
Joined: Sat Jun 18, 2016 7:29 am

Re: Why Two Tails on most New Military Jets?

Fri Sep 06, 2019 9:38 am

Stealth requires certain angles, vertical surfaces are not ideal

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