Hi, since there are so many people here that know far more than I can comprehend. I was wondering what people can make of these numbers that I found in a new book that I have.
The book is titled "Vee's for Victory" : The story of the Allision V-1710 aircraft engine 1929 - 1948. by Daniel D. Whitney. Published by Schiffer Military History Atglen, Pa. ISBN # 0-7643-0561-1
on page 334 table 15-5 it lists the performance as follows
Allision V-1710-F-17
Military power
altitiude for maximum speed 27,000'
maximum speed mph 418 mph
sea level 360 mph
5,000' 365 mph
10,000' 382 mph
15,000' 396 mph
20,000' 408 mph
25,000' 416 mph
30,000' 414 mph
absolute ceiling 42,300'
service ceiling 41,600'
climb in 5 minutes 17,800'
climb to 20,000' minutes 6.2
to 25,000' 8.7 minutes
to 30,000' 12.2 minutes
distance to takeoff 50' obstacle 1,640'
normal power
altitude for maximum speed 25,000'
maximum speed 395 mph
sea level 326 mph
5,000' 342 mph
10,000' 358 mph
15,000' 374 mph
20,000' 386 mph
25,000' 395 mph
30,000' 383 mph
absolute ceiling 38,500'
service ceiling 37,800'
on page 335 table 15-16 standard P-38J Allision V-1710-F-17
wep 1,600 hp
wer engine rpm 3,000
engine propeller gear ration 2.00:1
propeller diameter 11.5'
turbosupercharger,GE type B-33
fuel grade 130
propeller activity factor 89.3
P-38 operational weight 16,200lbs
maximum sea level speed 356 mph
maximum speed @ 30,000' 436 mph
max climb 5 minutes 18,700'
time to 30,000' 8.7 minutes
absolute ceiling 43,900'
can anybody shed some light on these figures? they appear to be from a P-38J-25-LO that had a reduced take off weight of 16,200lbs down from the normal 17,500lbs. It makes no mention of the condition of the aircraft. I just wondered what people thought. I have always enjoyed reading what some of the crew here writes. a lot of knowledge floating about here.
