JA37C / JA37D - Rb99 Discussion & Future changes

Its not in x-ray view but it has 4 DL channels in battle with time to hit info and everything.

Eh, ill wait till the rest of the vehicle is fixed. (Like thats gonna happen) Its not even worth touching in its current state as it stands.

What if no DL = unlimited DL?

no, usually means none

https://community.gaijin.net/issues/p/warthunder/i/oxRneNOWk9LF

Updated to accepted so heres hoping we see a change soon to the viggens. Fingers crossed for the engine temp, speed, and max altitude on them.

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Developer’s response:

we don’t adjust high altitudes exact: game atmosphere has no tropopause region. any aircraft is slightly underperforming at very high altitude. It will be tuned to able to achieve ~M1.6 with 50% fuel load.

for AJ-37 and AJS-37 max speed limit will be reduced according FPL to 1350km/h (JA-37 has M1.2 at SL will not be changed).

temperatures and times will be adjusted too

Huge rip to the AJ family so they imo are now dead since without speed at SL they are useless.

i’ll look at this later to fact check, what source did you use and where can i find it in a manual for the AJ or AJS

This is so stupid. This is only based off the fact the SFI del 3 cuts the chart off at mach 1.1 (1358). If you observe both graphs you can see that both the AJ37 and JA37 keep the same accelleration to 1.1, with the only difference being that the JA37 chart actually extends to mach 1.2.

If they had included the 1.2 range on the AJ37 manual the performance chart would’ve likely been identical.

for sources look up:

SFI FPL AJ 37 del 3 (kap. 11 sid. 9) (declassified)

SFI FPL JA37 del 4 (kap.2 sid. 8) (declassified)

If the true airframe limit would be 1.1 this would’ve likely been brought up in the manual. The reason this is non debatable is because there was no airframe strengthening between the AJ37 and JA37 when it comes to high speed tolerance, strengthening was only done in regards to high speed handling.

The chart indicates that the engine is not being bottlenecked past mach 1.1.

Only by mach 1.2 on the JA37 do we start to see a significant drop in acceleration.

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Id make another bug report on it then

on something they haven’t yet changed?

Yeah you could change their mind or alter it

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I would have to make a larger report later this week about the supersonic flight performance because its servo limited and not airframe limited. What gaijin decides to do with that information is not up to me.

The entire design specification is 1.2 at sea level which is why the engine has a high bypass ratio, good speed and acceleration at sea level

There is some half-truth to the 1358 IAS nerf even if i think its incredibly lazy in its research. Great work as always Gaijin.

All FPL documentation on the AJ37, both in terms of flight envelope and turning performance specify a hard limit at 1.1 mach sea level.

HOWEVER, if you read through FPL 37 Aerodynamik III Kompendium and FPL 37 Aerodynamik I Kompedium there is mentioned limitations in regards to the hydraulic system when M >1.0 at lower altitudes.

The Viggen family suffers from increased lift at higher speeds which forces the aircraft upwards when exceeding past mach. This is because of the lift generated by the wings, and at 1.1 this force is equal to that of full negative elevator, meaning the plane forcefully gains altitude.

This is why the JA37 has 1.2 specified as its limiting factor since the upgrade introduced more actuators to allow for a better flight envelope past mach. This is also why the JA37 seemingly has the same acceleration yet its entire graph is pushed by an additional .1 mach

It’s also worth mentioning that the flight manual and kompendium series don’t mention this as a hard limit, but that trying to circumvent this problem is EXTREMELY DANGEROUS, since a pilot cannot safely pull out from ex. a inverted position at this speed.

Thats the same as the AoA limit on the viggen, its there bc above 23 degrees the likelyhood of engine issues is greatly increased

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So are we thinking they might buff the JA37’s acceleration? Shame that the AJ series got nerfed but considering the 3 people who play swedish air aren’t playing the AJ series it may be a nuce buff to the rest of the Viggens. Can’t even think of the last time I saw an AJ in ground RB. Probably cause they suck and the SAAB 105/A32 does its job but better.

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I use it in milsim as its the only swedish aircraft with countermeasures before 1987
I can send you to Ja37s acceleration if you wanted