I wonder if anything ever published about cooling capacity of Su-27 or MiG-29’s. How many watts/sqm of heat they could remove 😀 ?

I know that N001 and perhaps N019 Radar is liquid cooled, but i don’t know the cooling capacity.

The fact that so many discussion about “AESA power”, “GaN” etc but so little related to cooling capacity required to support them kinda disturb me.

Congratulations for India. 😀

That KLJ-7A looks nice.

I tried to working on possible specs on it, based on whats available. We know that the radar is air cooled, based on it + some assumption of module operating modes reasonable estimates could be made regarding the emitted power.

The following equation is taken from “Radar Analysis and Modeling” book. 2005 edition, by David K Barton page 165. It relates emitted average power with cooling capacity.

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We know that KLJ-7A would be air cooled, then we could make some educated guesses on possible radar parameters :

-1000 TRM
-X band (0.032 m wavelength)
-Air cooling capacity of 2.3 Kw/sqm (air cooling capacity is between 1.5-2.3 KW/sqm) Liquid could be up to 155 KW but i wonder such capacity could be carried by fighter aircraft.
-Module efficiency (PAE) of 25% (A-class) Other classes could be used but for radar application this could compromise signal purity.

Working with the equation indicates the maximum average power that could be emitted from above spec is about 397 Watt. The peak power assuming 25% duty cycle (typical for pulse doppler radar) Is 1587.2 Watt or 1.5 KW. Each module’s peak emitted power is then 1.6 Watt.

Calculated range would be 191 km with 50% detection probability for 5 sqm RCS target. However it’s been revealed that the maximum range of KLJ-7A would be 170 km. Could be because my spreadsheet didn’t take account of clutter Or the radar have lesser amount of modules or power rating than what i assume.

what do you guys think 😀 ? The method could easily be expanded to guess another radar like say.. AN/APG-82 or others.

Im curious on what solution employed by A-100. is it like Phalcon or like E-2D Hawkeye :3.

yep.. the “Tu-22M4” with Tu-160 engine.

now what it needs is someone who wants to buy. and so.. it features no side bay ?

Well two possible reason i could think of.

1.Counter stealth, maximizing detection range against small target.. China have lots of cruise missile (Russia, India, Japan, Korea, Vietnam and of course US) and stealth user around. small power aperture product for fighter aircraft is not acceptable. By aiming largest possible aperture it allows maximizing detection range without expensive investment for TRM power.

2. Stealth. You can have large radome But, the antenna diameter would be constrained by the edge treatment to reduce structural mode RCS. The edge would need to be treated by 4 wavelengths of your lowest threat frequency. S band is not practical in this respect as it need 40 cm width edge treatment. Possible treatment would be C (5GHz) down to X band. If the threat frequency is X-band. That 1.2 m width radome can accommodate 90 cm diameter antenna. larger antenna is possible but edge treatment will suffer as it have to be designed for higher threat frequency.

Example for JSF.

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