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Your numbers are off a bit. At a launch weight of 51,000 pounds, the C11 will give you 125 knots, plus 19 knots from the ship, gives you 144 knots total. Even a Midway class can only give you 148 total (pre-SCB101.66). Yet they operated Phantoms just fine. Even the Essex could easily launch a Phantom, and did so routinely during training, carrier qualifications, and when used as an emergency landing area (there's a rather famous picture of an F-4 "captured" by Bonnie Dick after it ran low on fuel). At 52,000 pounds, per the F-4J SAC, the C11-1 needs 24 knots WOD to launch.For the Tiger, at 24,000 pounds, it has a power off stall speed of 133 knots. Again, power off. At that weight, the H8 can give you 96 knots and the carrier can give you another 31 for a total of 127. But with the proposed mods, including a new wing, that number will drop significantly. Between a new wing, a BLC system and possibly a modified nose wheel to increase the angle of attack on launch, you could drop your power off stall speed down to about 100 knots (based on how the F-4K had a much lower launch speed than the J because of the nose wheel (17 knots reduction) and the BLC (4-5 knots reduction)).
Your numbers are off a bit. At a launch weight of 51,000 pounds, the C11 will give you 125 knots, plus 19 knots from the ship, gives you 144 knots total. Even a Midway class can only give you 148 total (pre-SCB101.66). Yet they operated Phantoms just fine. Even the Essex could easily launch a Phantom, and did so routinely during training, carrier qualifications, and when used as an emergency landing area (there's a rather famous picture of an F-4 "captured" by Bonnie Dick after it ran low on fuel). At 52,000 pounds, per the F-4J SAC, the C11-1 needs 24 knots WOD to launch.
For the Tiger, at 24,000 pounds, it has a power off stall speed of 133 knots. Again, power off. At that weight, the H8 can give you 96 knots and the carrier can give you another 31 for a total of 127. But with the proposed mods, including a new wing, that number will drop significantly. Between a new wing, a BLC system and possibly a modified nose wheel to increase the angle of attack on launch, you could drop your power off stall speed down to about 100 knots (based on how the F-4K had a much lower launch speed than the J because of the nose wheel (17 knots reduction) and the BLC (4-5 knots reduction)).