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**Speed**is a composite of two things:

*Cruising Speed*and

*Combat Speed*

In both categories, it's rated as one point for every 10 MPH.

The two categories are then multiplied by a percentage and then added togther to generate the composite speed rating.

For example, Baugher gives the P-47D-25-RE:

429 MPH top speed (42.9 points)

195 MPH cruise speed (19.5 points)

A fighter composite weighted score would likely be something about:

50% Cruise

50% Top Speed

Representing the fact that fighters generally do fighter things.

So our P-47D-25-RE would be:

(42.9 * 0.5) + (19.5 * 0.5) = 31.2 total speed rating

By contrast, a P-51C-10-NT would be:

435 MPH top speed (43.5 points)

249 MPH cruise speed (24.9 points)

(43.5 * 0.5) + (24.9 * 0.5) = 34.2 total speed rating

That's one of the little things that's missed about the P-51 -- it had a rather high cruise speed thanks to it's "laminar flow" wing; and exceptionally low drag, which in turn gave it tremendous range, even without drop tanks.

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**Range**score is the result of adding two separate point values (if known):

*Internal Fuel*- One point for every 50 miles range on internal fuel.

*Drop Tanks*- One point for every 100 miles range on drop tanks.

This "pricing disparity" represents the fact that if you want to engage in combat with drop tanks; you have to jettison them. Plus drop tanks are a consumable expendable that must be managed.

So, for the P-51A:

750 miles on internal fuel = 15 points

1,250 extra miles with 2 x 125 gal drop tanks = 12.5 points

*Air-to-Air Refueling*- If the aircraft is equipped for it, multiply the final range score by 1.3x to represent potential mid-air refuelling extending aircraft range.

Air to Air Refueling capability was a major point of contention between Big USAF and Air Defense Command on the LRI-X (F-108) -- Big USAF was unwavering on that capability, while ADC saw no need for it in an interceptor.