LeadSpitter_

12-11-2004, 11:06 AM

http://mywebpages.comcast.net/markw4/alliedchrts2.jpg

Note that the Allisons in the P-38J-5-Lo through P-38J-25-Lo were Allison V-1710 F17 models, where as the Allisons in the P-38L-5-Lo and later were Allison V-1710 F30 models.

I threw some comparison numbers from some Japanese planes in for fun, WideWing gave me those too.

Much of this data is directly from Lockheed tests on the P-38 during production.

Time to height:

P-38F from sea level to 10,000 ft at 48 in. Hg. MAP, 2,900 rpm: 3.56 min.

P-38F from brake release to 10,000 ft.: 4 min, 35 sec.

P-38J sea level to 23,800 ft, 60 in. Hg. MAP, 3,000 rpm: 6.19 min., still

maintaining 2,900 fpm at that altitude.

P-38L sea level to 20,000 ft. 60 in. Hg. MAP, 3,000 rpm: 4.91min, still

maintaining 3,450 fpm at that altitude.

P-38G 345 mph @ 5,000 ft. / 402 mph @ 25,000 ft.(METO) / Climb: 2,885 fpm.avg.

P-38H 352 mph @ 5,000 ft. / 409 mph @ 22,000 ft.(METO) / Climb: 3,070 fpm.avg.

P-38J 360 mph @ 5,000 ft. / 421 mph @ 22,500 ft.(METO) / Climb: 3,585 fpm.avg.

P-38L 365 mph @ 5,000 ft. / 442 mph @ 22,500 ft. (WEP) / Climb: 3,750 fpm.avg.

Ratings [minutes] Power RPM Manifold [in.Hg] Altitude [ft]

Normal (no limit) 1,100 2,600 44 30,000

Take Off (5) 1,475 3,000 54 SL

Military (15) 1,475 3,000 54 30,000

WEP (5) 1,725 3,000 60 28,700

Max speed at sea level: 352 mph

Max speed at 5,500 ft : 369 mph

Max speed at 23,500 ft. 440 mph (WEP) 5 minutes max.

Max speed at critical alt: 444 mph @ 25,800 (WEP) 5 minutes max.

Max climb rate at sea level: 4,225 fpm (50% fuel, normal ammo)

Max climb rate at 23,400 ft: 3,940 fpm

Time to 23,400 ft: 5.94 minutes

Time to 30,000 ft: 8.86 minutes

Service Ceiling: 44,000 ft.

The most commonly printed max speed numbers for the P-38L state

414 mph. How interesting. Consider that the L was fitted with the -30

Allisons, as opposed to the -17 on the J. There is a big difference, and

I'll go into that a little later.

The typical numbers presented for the J are 421 mph IN WEP.

The typical numbers presented for the L are 414 mph IN METO.

This is one of the pitfalls of using commercially available data. It

usually isn't researched very well. The difference between METO and

WEP is 600 hp. The -30 produced a minimum of 1,725 hp in WEP.

As opposed to 1,425 hp in METO.

The -17 installed in the P-38J had the same METO rating as the -30

at 1,425 hp. However, the -17 only made 1,600 hp in WEP, where as

the -30 made 1725 hp in WEP. The additional power could push the

L to speeds over 440 mph. Warren Bodie concludes the maximum speed

in WEP as 443 mph at altitudes between 20,000 and 23,500 ft. Bodie

obtained his data directly from Lockheed, where he was employed as

an engineer on the U-2 and F-117 programs. Therefore, I tend to except

Bodie as a more credible source than Green and Swanborough et al.

Typical speeds Avg. climb rate to alt. at left

Ki-44 378 mph @ 17,500 ft. / Climb: 3,700 fpm.

Ki-61 362 mph @ 16,400 ft. / Climb: 2,380 fpm.

Ki-84 392 mph @ 21,325 ft. / Climb: 3,790 fpm.

Ki-100 366 mph @ 19,700 ft. / Climb: 2,750 fpm

N1K1 363 mph @ 17,700 ft. / Climb: 2,510 fpm.

N1K2 371 mph @ 18,400 ft. / Climb: 2,675 fpm.

J2M3 365 mph @ 17,900 ft. / Climb: 3,570 fpm.

P-38G 345 mph @ 5,000 ft. / 402 mph @ 25,000 ft.(METO) / Climb: 2,885 fpm.avg.

P-38H 352 mph @ 5,000 ft. / 409 mph @ 22,000 ft.(METO) / Climb: 3,070 fpm.avg.

P-38J 360 mph @ 5,000 ft. / 421 mph @ 22,500 ft.(METO) / Climb: 3,585 fpm.avg.

P-38L 365 mph @ 5,000 ft. / 442 mph @ 22,500 ft. (WEP) / Climb: 3,750 fpm.avg.

The basic performance figures for the P-38L are as follows (from Lockheed

factory test logbooks):

Max speed at sea level: 352 mph

Max speed at 5,500 ft : 369 mph

Max speed at 23,500 ft. 440 mph (WEP) 5 minutes max.

Max speed at critical alt: 444 mph @ 25,800 (WEP) 5 minutes max.

The P-38L, continued

Max climb rate at sea level: 4,225 fpm (50% fuel, normal ammo)

Max climb rate at 23,400 ft: 3,940 fpm

Time to 23,400 ft: 5.94 minutes

Time to 30,000 ft: 8.86 minutes

Service Ceiling: 44,000 ft.

Note that the Allisons in the P-38J-5-Lo through P-38J-25-Lo were Allison V-1710 F17 models, where as the Allisons in the P-38L-5-Lo and later were Allison V-1710 F30 models.

I threw some comparison numbers from some Japanese planes in for fun, WideWing gave me those too.

Much of this data is directly from Lockheed tests on the P-38 during production.

Time to height:

P-38F from sea level to 10,000 ft at 48 in. Hg. MAP, 2,900 rpm: 3.56 min.

P-38F from brake release to 10,000 ft.: 4 min, 35 sec.

P-38J sea level to 23,800 ft, 60 in. Hg. MAP, 3,000 rpm: 6.19 min., still

maintaining 2,900 fpm at that altitude.

P-38L sea level to 20,000 ft. 60 in. Hg. MAP, 3,000 rpm: 4.91min, still

maintaining 3,450 fpm at that altitude.

P-38G 345 mph @ 5,000 ft. / 402 mph @ 25,000 ft.(METO) / Climb: 2,885 fpm.avg.

P-38H 352 mph @ 5,000 ft. / 409 mph @ 22,000 ft.(METO) / Climb: 3,070 fpm.avg.

P-38J 360 mph @ 5,000 ft. / 421 mph @ 22,500 ft.(METO) / Climb: 3,585 fpm.avg.

P-38L 365 mph @ 5,000 ft. / 442 mph @ 22,500 ft. (WEP) / Climb: 3,750 fpm.avg.

Ratings [minutes] Power RPM Manifold [in.Hg] Altitude [ft]

Normal (no limit) 1,100 2,600 44 30,000

Take Off (5) 1,475 3,000 54 SL

Military (15) 1,475 3,000 54 30,000

WEP (5) 1,725 3,000 60 28,700

Max speed at sea level: 352 mph

Max speed at 5,500 ft : 369 mph

Max speed at 23,500 ft. 440 mph (WEP) 5 minutes max.

Max speed at critical alt: 444 mph @ 25,800 (WEP) 5 minutes max.

Max climb rate at sea level: 4,225 fpm (50% fuel, normal ammo)

Max climb rate at 23,400 ft: 3,940 fpm

Time to 23,400 ft: 5.94 minutes

Time to 30,000 ft: 8.86 minutes

Service Ceiling: 44,000 ft.

The most commonly printed max speed numbers for the P-38L state

414 mph. How interesting. Consider that the L was fitted with the -30

Allisons, as opposed to the -17 on the J. There is a big difference, and

I'll go into that a little later.

The typical numbers presented for the J are 421 mph IN WEP.

The typical numbers presented for the L are 414 mph IN METO.

This is one of the pitfalls of using commercially available data. It

usually isn't researched very well. The difference between METO and

WEP is 600 hp. The -30 produced a minimum of 1,725 hp in WEP.

As opposed to 1,425 hp in METO.

The -17 installed in the P-38J had the same METO rating as the -30

at 1,425 hp. However, the -17 only made 1,600 hp in WEP, where as

the -30 made 1725 hp in WEP. The additional power could push the

L to speeds over 440 mph. Warren Bodie concludes the maximum speed

in WEP as 443 mph at altitudes between 20,000 and 23,500 ft. Bodie

obtained his data directly from Lockheed, where he was employed as

an engineer on the U-2 and F-117 programs. Therefore, I tend to except

Bodie as a more credible source than Green and Swanborough et al.

Typical speeds Avg. climb rate to alt. at left

Ki-44 378 mph @ 17,500 ft. / Climb: 3,700 fpm.

Ki-61 362 mph @ 16,400 ft. / Climb: 2,380 fpm.

Ki-84 392 mph @ 21,325 ft. / Climb: 3,790 fpm.

Ki-100 366 mph @ 19,700 ft. / Climb: 2,750 fpm

N1K1 363 mph @ 17,700 ft. / Climb: 2,510 fpm.

N1K2 371 mph @ 18,400 ft. / Climb: 2,675 fpm.

J2M3 365 mph @ 17,900 ft. / Climb: 3,570 fpm.

P-38G 345 mph @ 5,000 ft. / 402 mph @ 25,000 ft.(METO) / Climb: 2,885 fpm.avg.

P-38H 352 mph @ 5,000 ft. / 409 mph @ 22,000 ft.(METO) / Climb: 3,070 fpm.avg.

P-38J 360 mph @ 5,000 ft. / 421 mph @ 22,500 ft.(METO) / Climb: 3,585 fpm.avg.

P-38L 365 mph @ 5,000 ft. / 442 mph @ 22,500 ft. (WEP) / Climb: 3,750 fpm.avg.

The basic performance figures for the P-38L are as follows (from Lockheed

factory test logbooks):

Max speed at sea level: 352 mph

Max speed at 5,500 ft : 369 mph

Max speed at 23,500 ft. 440 mph (WEP) 5 minutes max.

Max speed at critical alt: 444 mph @ 25,800 (WEP) 5 minutes max.

The P-38L, continued

Max climb rate at sea level: 4,225 fpm (50% fuel, normal ammo)

Max climb rate at 23,400 ft: 3,940 fpm

Time to 23,400 ft: 5.94 minutes

Time to 30,000 ft: 8.86 minutes

Service Ceiling: 44,000 ft.