SD-10 Dual rack drag

[Creampie]

I noticed some really bad drag issues with the JF17 top end speed quite some time back and never really got around to testing it. Never really needed to test it, but I don't think this is as intended. I know that the RD-93 isn't the most powerful engine & these jets don't neccasirly need to be too far above mach anyway.

Below are 4 screenshots showing the fuel, speed & loadout.

My question is, Is this amount of drag intentional? If so, Why? 

It doesn't seem to make much sense that you lose 33% of your top end speed by adding the additional 2 missiles & their pylons.

I've got some testing yet to do with other weapons and will post them as well when I get a little free time.

In this screenshot, With 100% fuel, we are at 35k on Syria with the temp set to 20C, Max speed of Mach 1.55, Single rack SD10 and dual PL5s

 

In this screenshot we are 51lbs of fuel, 35k feet on Syria with the temp set to 20C, Mach 1.57, Single rack SD10 and dual PL5

This difference is a little irrelevent to my concern, As we are approaching top end speed anyway, But just for testing I wanted to see.

 

In this screenshot, FULL FUEL, 35k, Syria, 20C, Dual rack SD10, Dual PL5s, Speed of Mach 1.10

 

And the last screenshot, 51lbs of fuel, Syria, 35k, 20C, Dual Rack SD10s with dual PL5s and a speed of Mach 1.15

[Creampie]

More testing, Both of these test are something the JF17 can not do in full burner. 

Same parameters, Syria, 35k, 20c - Flight time of 222nm Mach 1.33) (0.22 mach faster than a 40nm flight)

null

Same parameters, Syria, 35k, 20C - Flight of 222nm Mach 1.11 (0.01 Mach faster than 40nm)

Edited August 8 by Creampie

[Creampie]

 

You can ALMOST hit mach with 2 SD10s, 2 PL5s & 2 GB-6 SFWs (0.11 slower than the subject in question....., 2x Dual rack SD10)

Same parameters, Syria, 35k, 20c (40nm trip)

Edited August 8 by Creampie

[Creampie]

Here is the biggest concern one,

2 PL5s, 2 BRM pods (the weapon with the most drag on the JF17,) 

Same parameters, Syria, 35k, 20c 40nm Speed of mach 1.01 (0.09) slower than 2 SD10 & 2 PL5s

[AeriaGloria]

The data mine does show drag index of some objects 

DL: 6

BRM-90 pod: 10

C-802: 9.4

Fuel tank 800L: 5.7

Fuel tank 1100L: 6.1

SPJ: 2.6 

WMD-7: 4.3

AKD-10: 2

SD/LD-10: 2.2

GB/6: 10

LS-6 500: 8

LS-6 250: 8

LS-6 100: 1.7 

PL-5: 1.6 

C-701: 4 

Durandal: 0.7 

 

Launcher:

BRM-1/AKd-10:4

SD-10 single pylon: 2.6

SD-10 dual: 6.14

C-701: 2.5 

C-802/fuel tank pylon: 9.4 

LS6-100: 1.7 

LS6-100 dual: 8.5

LS6-250: 4.9

[Creampie]

On 8/19/2025 at 8:47 AM, AeriaGloria said:

The data mine does show drag index of some objects 

 

DL: 6

BRM-90 pod: 10

C-802: 9.4

Fuel tank 800L: 5.7

Fuel tank 1100L: 6.1

SPJ: 2.6 

WMD-7: 4.3

AKD-10: 2

SD/LD-10: 2.2

GB/6: 10

LS-6 500: 8

LS-6 250: 8

LS-6 100: 1.7 

PL-5: 1.6 

C-701: 4 

Durandal: 0.7 

 

Launcher:

BRM-1/AKd-10:4

SD-10 single pylon: 2.6

SD-10 dual: 6.14

C-701: 2.5 

C-802/fuel tank pylon: 9.4 

LS6-100: 1.7 

LS6-100 dual: 8.5

LS6-250: 4.9

 

 

So forgive my ignorance of understanding this but;

Dual SD10 pylon itself is 6.14, Each SD10 adds an additional 2.2,

Meaning both pylons & all 4 sticks are a total value of 21.08,

21.08 @ 35k, burner, will get you to 1.12 over a 40nm span.

 

Single SD10 pylon itself is 2.6 each, Each SD10 adds an additional 2.2,

Both pylons, both sticks & 2 800L fuel tanks have a drag value of 21 even

If I understand this correctly, 2 800L fuel tanks and 2 SD10s have a slightly less drag value than just 4 SD10s & their pylons

or 1.08 more drag than 2 huge BRM pods? lol 

 

 

 

[Napillo]

Odd that the LS-6-250 and the LS-6-500 bombs have the same drag.

[DSplayer]

6 hours ago, Creampie said:

 

 

So forgive my ignorance of understanding this but;

Dual SD10 pylon itself is 6.14, Each SD10 adds an additional 2.2,

Meaning both pylons & all 4 sticks are a total value of 21.08,

21.08 @ 35k, burner, will get you to 1.12 over a 40nm span.

 

Single SD10 pylon itself is 2.6 each, Each SD10 adds an additional 2.2,

Both pylons, both sticks & 2 800L fuel tanks have a drag value of 21 even

If I understand this correctly, 2 800L fuel tanks and 2 SD10s have a slightly less drag value than just 4 SD10s & their pylons

or 1.08 more drag than 2 huge BRM pods? lol 

 

 

 

The dual SD-10 pylon loadout is ~6.16 (0.00150390623 * 4096), which includes both missiles and the pylon. Each missile itself in that loadout is ~2.64 (0.00064453124 * 4096) and that value is subtracted from the dual pylon loadout when the missile is fired. 

Same for the single SD-10 loadout which has a total drag value of ~2.64 (0.00064453124 * 4096) while the missile itself is 2.2.

The drag for dual SD-10 loadouts are high but aren't that high. For reference, the AIM-120 LAU-115 2xLAU-127 dual pylons has a drag roughly of 8.027.