Need some J2M experts here

[Mirage]

J2M vs Fw 190 A/F Cowl design, just browsing the net and am currious as to how the japanese were sccessful with the J2M's cowl design, did it suffer serious over heating problems? if not, how did then manage to get the cowl so tight but still allow sufficient cooling?  because on all pictures, it seems like the J2M's cowl resembles Fw 190V-1's cowl?

[HighTone]

From what I recall, they had the bomber engine in the J2M set pretty far back and used and extend cowling so that they could get a tighter fit around the prop. They used a cooling fan to help pull air in for cooling. That's why shes got that extended snout, even with a radial engine.

[Mirage]

I realise that it is extended, my question was how they cooled it adequately with such a small opening

[Karnak]

I recall reading that the prototype J2M had an even longer cowl, but the main problem it had wasn't overheating, it was the long prop shaft causing vibrations or some such.

[Charge]

And usually the front cylinders are fine, what ever the arrangement, but its the back cylinders which have trouble getting enough cooling if the engine cooling is a tight fit. I recall that it was a problem in BMW801 for quite long even after they had FW190 up and flying and realized that the engine needs baffling to get fresh air to back cylinders. Of course this is only a problem in twin radials. Also the venting in rear of the engine compartment helped to solve the overheating problem. It also seems that there was more venting in J2M than in FW190 which also relied on engine compartment overpressure to keep oil cooler effective. There was a separate oil cooler under the nose in at least J2M3 onwards, I don't know about the earlier variants.

Nice pic of Mitsubishi Kasei engine arrangement: http://galerie.palba.cz/displayimage.php?pos=-6948

-C+

[Mirage]

so they over came the fronts short comings by opening up the back even more, I never thought about this before but I just sort of made my own mental image of how the air behaves once it is in the cowl, that makes sence and thanks for the clarification

[Karnak]

I will add, that seeing those pictures really makes me want to see the J2M added to AH.  I'd like to see it in two versions, J2M3 and J2M5.

[oboe]

I will add, that seeing those pictures really makes me want to see the J2M added to AH.  I'd like to see it in two versions, J2M3 and J2M5.

 

[Charge]

Another brick like the A8 and nobody would fly it, except masochists... 

-C+

[save]

The Fw190a8 IRL was more nimble than the rest of the FW A-series .
It had the same wingloading , due to a improved slight larger , lighter wing design, among other things.
With the GM-1 A8 was an equal in speed to its competitors at low-medium-alt.

50% of JG26s Focke-Wulfs where equpped with this booster-system during the fighting in france following the invasion.
In AH we have an overweight A8 with no GM-1.

[Yeager]

I think I am going to go pop a hit of acid and ponder this question of yours on a whole different level.  Will return with the results in about 8 hours.

[Wmaker]

It had the same wingloading , due to a improved slight larger , lighter wing design, among other things.

The wing area of the Fw190s remained unchanged throughout the A-models and also through the D-series.

[Krusty]

There was a small modification starting with the A-6, but the extent was simply reorganizing the outboard gun bay to accept the larger magazines and guns and internal stuff for the later outboard armaments (MG151/20s and Mk108s). It wasn't larger and it wasn't lighter and it wasn't an improvement (not aerodynamically, I mean).

Also, the 190A8 never had GM-1, and GM-1 will damage an engine if run below 30,000 feet or so. It's an extreme altitude boost only.

You may be thinking of MW50.... 

However, not many A8s had this installed. Many used the MW50 tank to store regular fuel. This is where the AUX tank in aces high comes into play. That's why the Dora doesn't have an AUX (it's holding MW50 instead).

The 190A9 may have had MW50 in small numbers, but overall it wasn't big for the Antons.

[oboe]

Another brick like the A8 and nobody would fly it, except masochists...  

-C+

I think the J2M could handily outclimb the A8, it with only 70% of the A8's wingloading should be more manueverable as well.   It would give up 30-40 mph to the FW in top speed, and I couldn't guess at what its rollrate comparison would be.   I think it looks much cooler than the N1K but would be similiar in performance and armament to the George, so maybe its not different enough to warrant inclusion in the game.    Still, compared to other Japanese fighters like the Zero or Oscar it's a muscular brute with a powerful punch.  I'd like to see it in game someday but then I fly the 39Q fairly often so I think I must be a masochist!   
      

[HighTone]

I would love to see the J2M's in AH in what ever variant we might get.


I still think the J2M didn't quite behave in the dives at 350mph+ like the George. The J2M did have the same number of cannons as the George, but only two of them were the Type 99 Mk2's. To smooth up the airframe they switched the outer cannons back the Type 99 Mk1's. I think the George would be better in the dive and still have better punch. Just those two differences for me would warrant its inclusion in AH, making it different than the George.