Engine Upgrades

Improved Turbine - More effecient design lets the turbine burn fuel better, giving a permanent speed boost.
+55 Speed
-35 Strength
Cost : 760,000

Sheol Stage One Fighter Engine - Compeltely new engine that has any plane boost its mobility thanks to having a much high power - weight ratio.
+40 Speed
+45 Mobility
-40 Strength
Cost : 4,500,000

Sheol Stage Two Fighter Engine - Uses a new secret fuel that burns much hotter before it even reaches the afterburner section, improves speed and mobility even more at the cost of fragility.
+75 Speed
+60 Mobility
-120 Strength
Cost : 19,550,000

Variable 2D Engine Nozzles - Improve mobility by changing the direction of the engines thrust in the up and down axis.
+95 Mobility
-40 Strength
Cost : 4,000,000

Variable 3D Engine Nozzles - Improve mobility even more by letting the nozzles help yaw aswell.
+250 Mobility
-60 Strength
Cost : 8,600,000

Ramjet - A Jet engine made for extremely highspeeds, this will require a stronger airframe to handle the immense stress.
+700 Speed
-260 Strength
-150 Mobility
Cost : 28,000,000

Scramjet - A motor with nearly no moving parts, you have to be moving at extremely highspeeds for it to even work, can be added to a plane with an upgraded Turbine or Ramjet engine to get upto speed first.
+1,400 Speed
-300 Strength
-300 Mobility
Cost : 55,000,000

Rocket - A rocket that can be re-used indefinitely, you simply have to keep buying fuel for the ultimate in speed. This motor is not as fragile, but its heavy and hard to control.
+3,000 Speed
-100 Strength
-500 Mobility
Cost : 96,000,000