Engine Modeled for the Baker and the Dog P-51 Question

[Paladin3]

I am curious what model engines are modeled in both planes?

[Eric19]

1 × Packard Merlin V-1650-7 liquid-cooled supercharged V-12, 1,490 hp (1,111 kW) at 3,000 rpm;[86] 1,720 hp (1,282 kW) at WEP

[Soulyss]

I'm going from memory, but I think that Eric is correct the 51D using the -7, I want to say the 51B has the -3....

But it's been ages since I looked it up so I could be wrong.

[Chalenge]

Soulyss is correct. The B/C has the V-1650-3 Merlin 61 while the D/K has the V-1650-7 R.M 10 S.M. which is similar to the Merlin 68.

While the D does have more horse power at sea level (1490 vs 1380) the high blower critical altitude for the B/C is 3,700 feet higher than the D/K. This is different enough from the British figures to indicate that even though it is referred to as a Merlin 61 it is in fact a different engine.  This is why the Packard Merlin (V-1650-3) is referred to as the 'high altitude' Merlin. The V-1650-7 has a different supercharger gear ratio in low (5.802 versus 6.391) and in high (7.349 versus 8.095) which allows better performance at lower altitudes without the risk of overboosting. Between the two aircraft the difference is only slight (see the HTC performance tables).

[MiloMorai]

With the introduction of the P-51C-5-NT onto the Dallas production line and the P-51B-15-NA in the Inglewood production line, the Packard V-1560-7 engine was adopted as standard.

[Chalenge]

Not sure what a V-1560-7 is (fat fingered I think) but. . .

There are actually four subtypes of P-51Bs, the P-51B-1NA, -5NA which had the V-1650-3 and the P-51D-10NA, -15NA which had the V-1650-7.
Also the P-51Cs had six subtypes, the P-51C-1NT, Mustang III which had the V-1650-3 and the P-51C-5NT, -10NT, Mustang III (block 2) and F-6C which had the V-1650-7.

And actually the subtypes had variants in between that never met mass production.

Because of the performance the P-51B has in AH it most certainly has the V-1650-3.

[MiloMorai]

Not sure what a V-1560-7 is (fat fingered I think) but. . .

What else could it be?

[MiloMorai]

There are actually four subtypes of P-51Bs, the P-51B-1NA, -5NA which had the V-1650-3 and the P-51D-10NA, -15NA which had the V-1650-7.

How can a P-51D be a P-51B? Fat fingers?

P-51Bs had 2 designations, NA-102 and NA-104 as did the P-51C, NA-103 and NA-111.

[Chalenge]

Not sure what a V-1560-7 is (fat fingered I think) but. . .

There are actually four subtypes of P-51Bs, the P-51B-1NA, -5NA which had the V-1650-3 and the P-51B-10NA, -15NA which had the V-1650-7.
Also the P-51Cs had six subtypes, the P-51C-1NT, Mustang III which had the V-1650-3 and the P-51C-5NT, -10NT, Mustang III (block 2) and F-6C which had the V-1650-7.

And actually the subtypes had variants in between that never met mass production.

Because of the performance the P-51B has in AH it most certainly has the V-1650-3.

Fixed. Production numbers for high altitude V-1650-3 "Bravo" Mustangs were 1200 versus 782 of the V-1650-7. And for the V-1650-3 "Charlie" Mustangs 800 high altitude models versus 950 of the V-1650-7 versions of which 636 were reassigned to British units as Mustang IIIs. Looks to me like HTC made the best decision and your comment was incorrect all the way around.

[MiloMorai]

P-51B/C -   Razorback Merlin Powered Mustangs
Designation    NAA Model    Construction Numbers    Serial Numbers    Count
     
  P-51B-1NA      NA-102    102-24541    102-24940    43-12093    43-12492    400
  P-51B-5NA      NA-104    104-22816    104-23305    43-6313    43-6802    490
  P-51B-5NA      NA-104    104-24431    104-24540    43-6803    43-6912    110
  P-51B-5NA      NA-104    104-24941    104-25140    43-6913    43-7112    200
  P-51B-7NA      NA-104    (550)    taken    from    P-51B-5NA    0
  P-51B-10NA      NA-104    104-25141    104-25230    43-7113    43-7202    90
  P-51B-10NA      NA-104    104-25231    104-25340    42-106429    42-106538    110
  P-51B-10NA      NA-104    104-25343    104-25540    42-106541    42-106738    198
  P-51B-15NA      NA-104    104-25541    104-25780    42-106739    42-106978    240
  P-51B-15NA      NA-104    104-25781    104-25930    43-24752    43-24901    150
 
  P-51C-1NT      NA-103    103-22416    103-22765    42-102979    42-103328    350
  P-51C-3NT      NA-103    - 0    taken    from    P-51C-1NT    0
  P-51C-5NT      NA-103    103-22766    103-22815    42-103329    42-103378    50
  P-51C-5NT      NA-103    103-25933    103-26332    42-103379    42-103778    400
  P-51C-10NT      NA-103    103-26333    103-26532    42-103779    42-103978    200
  P-51C-10NT      NA-103    103-26533    103-26882    43-24902    43-25251    350
  P-51C-10NT      NA-111    111-28886    111-28915    44-10753    44-10782    30
  P-51C-11NT      NA-111    111-28916    111-28950    44-10783    44-10817    35
  P-51C-10NT      NA-111    111-28951    111-28985    44-10818    44-10852    35
  P-51C-11NT      NA-111    111-28986    111-28991    44-10853    44-10858    6
  P-51C-10NT      NA-111    111-28992    111-29169    44-10859    44-11036    178
  P-51C-11NT      NA-111    111-29170    111-29255    44-11037    44-11122    86
  P-51C-10NT      NA-111    111-29256    111-29285    44-11123    44-11152    30
     
Total P-51B Mustangs          1988
Total P-51C Mustangs          1750

[drgondog]

Not sure what a V-1560-7 is (fat fingered I think) but. . .

There are actually four subtypes of P-51Bs, the P-51B-1NA, -5NA which had the V-1650-3 and the P-51D-10NA, -15NA which had the V-1650-7.
Also the P-51Cs had six subtypes, the P-51C-1NT, Mustang III which had the V-1650-3 and the P-51C-5NT, -10NT, Mustang III (block 2) and F-6C which had the V-1650-7.

And actually the subtypes had variants in between that never met mass production.

Because of the performance the P-51B has in AH it most certainly has the V-1650-3.

I would agree with comments about the block breaks. The first batch of -5NA's rolled out without the 85 gallon fuse tank, the  -7NA was simply the -5 with 85 gallon tank installed on production line.  The 1650-3 were largely retrofitted with the 1650-7 upon engine changes on all B/Cs starting after April 1944.

From a modler's stanpoint I don't think there is a tangible external feature of the -7 from the -3. The blower gears were different and the Carb was slightly different but up against the firewall and impossible to note at that scale.