I like to use Basic weights as an indicator of wing loading and power loading to get a better picture of "combat weight".
Hi F4UDOA,
I agree that the relative performance will change based on individual aircraft loadout. I do not think it will be a very dramatic change and the FW-190 would retain it's low speed advantages.
AHT list's 14,500lbs as the combat weight of the P 47D25 (+) and is used on all the performance graphs for the type. I would think that the P47D4 tested has the auxillery main internal tank installed as well as the auxillery tank and larger water injection tank. However we do not know for certain and can only use what they have given us 60 years ago.
Anybody have a load sheet for the P47D4?
The FW-190 weight is listed as 3,855.54 kilograms. That comes very close to a 60 percent fuel weight of the FW-190A5 with full wing armament or as the aircraft was set up, fully loaded combat weight of an FW-190A5 without full wing armament. However it is impossible to pin down exactly what FW-190A they were trying to simulate based on the weight alone.
It is interesting BTW, that Focke Wulf determined there was no performance differences between an aircraft with or without the wing armament. From the FW-190A5 and up, that version is not even a factory produced fighter variant. Which makes sense when you consider the results of the Spitfire testing. Another design which gained weight and power over it's lifetime.
I think you have compared completely empty weights too. A completely empty FW-190A5 without, oil, fuel, pilot, ammo, etc.. weighs 7,301.71 pounds (avoirdupois). You would have to remove all the radios and service gear to reach 6700lbs and it would not be representative of an FW-190 accepted for Luftwaffe service. It would be an empty aircraft sitting on the factory floor. Same with the P47D4. AHT list's the basic weight as 10,700 lbs for both the P47C and D25 (-).
That comes out to:
FW-190A5 = 37lbs /sq ft empty
P47D4 = 35.6lbs/sq ft. empty
It is not the wingloading that determines angle of bank and minimum radius of turn.
It is the powerloading. Weight wise there is little to no difference between a P47D4 and a P 47C. I can post the P47C tactical trials but that one is really ugly for the Thunderbolt. It concludes that the best chance the P47 has is to spot the FW-190 first and dive away.
The P47C is outclassed by the FW-190 in all performance parameters except top diving speed in the tactical trials vs the same FW190A5.
Wingloading P47C vs FW-190A5 at fully loaded take off weights fighter configuration:
Fully loaded:
FW-190A5 = 46lbs / sq ft
Even at the listed weight the FW-190's wingloading is a whooping 1 lb heavier than the P47C fully loaded.
P47C = 42lbs / sq ft
All the P47D4's performance improvements are the result of better powerloading/thrust over the P 47C. In spite of the added weight of water injection, additional armour, and internal auxillery tanks.
Here we see that the Spitfire Mk XIV gains 1000lbs and 5 lbs / sq ft more wingloading than the Spitfire Mk IX. Yet it has exactly the same turn performance as the lighter, less wingloaded Spitfire Mk IX:
The tactical differences are caused chiefly by the fact that the Spitfire XIV has an engine of greater capacity and is the heavier aircraft (weighing 8,400 lbs. against 7,480 lbs. of Spitfire IX).
The turning circles of both aircraft are identical. The Spitfire XIV appears to turn slightly better to port than it does to starbord. The warning of an approaching high speed stall is less pronounced in the case of the Spitfire Mk XIV.
http://www.spitfireperformance.com/spit14afdu.htmlIt would be nice to see a load plan for the P47D4 with paddle blade prop and water injection however.
It would be nice to see a comparision of an FW-190A8 with a wide chord wooden prop too, but that is wishful thinking!
All the best,
Crumpp