F-35 vs Su-30/35

The F-35 compared with other modern jets.
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eloise

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Unread post31 Mar 2015, 14:11

spazsinbad wrote:Thanks for all your input 'eloise' (a lot goes over my head though) meanwhile here is some old info: (search on key distinct words on this forum to find the original discussion or similar info)]

thanks spazsinbad
i was just trying to estimate F-22, F-35 approximate average frontal RCS with different kind of RAM
For example , here is F-22 RCS simulation if it was made fully from metal
Image
here is absorbing capabilities at different frequency of a common RAM
Image
put these 2 together , we can see that with this RAM F-22 will have RCS of about - 44 dBsm at 8 Ghz, around - 35 dBsm at 9 Ghz, - 13 dBsm at 10 Ghz, - 12 dBsm at 2 Ghz, and so on
obviously with different kind of RAM the results will be very different
for example with this RAM
Image
F-22 will have RCS = - 20 dBsm at 10 Ghz but it will have around - 30 dBsm at 8 Ghz
Last edited by eloise on 31 Mar 2015, 15:39, edited 1 time in total.
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bring_it_on

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Unread post31 Mar 2015, 14:27

What is common RAM? Do you think the "secret sauce" is 'commonly shared'?

On RAM and RCS -

https://www.scribd.com/doc/260281522/RAM-and-RCS
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eloise

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Unread post31 Mar 2015, 14:29

hornetfinn wrote:
APG-80 is smaller in size and power to APG-79. APG-80 is designed to fit inside the smaller 600mm diameter class nose of F-16 and APG-79 the larger 700mm class nose of Super Hornet. This means that APG-80 has about 75% of the range performance of APG-79 if both are using similar construction and same T/R modules (lower power, smaller antenna area).

.

sorry i was trying to say APG-81 and APG-79 have same size and diameter, power
btw what do you think about Gripen NG radar?, it use a new kind of T/R modules, i think
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eloise

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Unread post31 Mar 2015, 14:45

bring_it_on wrote:What is common RAM? Do you think the "secret sauce" is 'commonly shared'?


no, but i think there may be something similar, for example i haven't seen any RAM have attenuation of more than - 20 dBsm at 10Ghz, most RAM dont work or not effective at all below 2 Ghz

bring_it_on wrote:On RAM and RCS
https://www.scribd.com/doc/260281522/RAM-and-RCS

interesting
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Unread post31 Mar 2015, 15:04

Good luck estimating classified capability that has been backed by significant investment over the last 2-3 decades.
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sergei

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Unread post31 Mar 2015, 15:28

" AN/APG-81 likely has quite a bit more as it has more and likely newer (higher efficiency and higher power) modules and probably has better cooling capacity. I see it possibly having closer to 10 kW average output power, which is huge amount of power for a fighter radar."

Apg-77 can track target with RCS = 1m2 from 190 km+ in LPI
Apg-81 can track target with RCS = 1m2 from 150 km in LPI
:?
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eloise

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Unread post31 Mar 2015, 15:36

bring_it_on wrote:Good luck estimating classified capability that has been backed by significant investment over the last 2-3 decades.

:? doesn't we estimate fighter and weapons capabilities all the time. :?
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eloise

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Unread post31 Mar 2015, 15:46

sergei wrote:" AN/APG-81 likely has quite a bit more as it has more and likely newer (higher efficiency and higher power) modules and probably has better cooling capacity. I see it possibly having closer to 10 kW average output power, which is huge amount of power for a fighter radar."

Apg-77 can track target with RCS = 1m2 from 190 km+ in LPI
Apg-81 can track target with RCS = 1m2 from 150 km in LPI
:?

i think you probably interested in this
here is YF-23 RCS pattern if it was made fully from metal ( simulation)
Image
so frontal is around - 10 dBsm to - 20 dBsm
applied RAM will reduce RCS by another 20 to 25 dBsm, it easy to see how stealth fighter can achieve - 30 to - 40 dBsm frontal
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sergei

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Unread post31 Mar 2015, 16:21

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eloise

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Unread post31 Mar 2015, 16:47

sergei wrote:http://s8.uploads.ru/T3O8i.png

flight manual ?
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sergei

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Unread post31 Mar 2015, 17:41

"Руководства по технической эксплуатации N 10 книги 1"
"aircraft have half filling fuel in internal tanks, engine operation - full afterburner"
Last edited by sergei on 31 Mar 2015, 17:57, edited 1 time in total.
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eloise

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Unread post31 Mar 2015, 17:46

sergei wrote:"Руководства по технической эксплуатации N 10 книги 1"

T-10 is also known as Flanker A :wink: aka Su-27
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sergei

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Unread post31 Mar 2015, 17:59

eloise wrote:
sergei wrote:"Руководства по технической эксплуатации N 10 книги 1"

T-10 is also known as Flanker A :wink: aka Su-27


F16=F16A
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eloise

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Unread post31 Mar 2015, 18:13

sergei wrote:
eloise wrote:
sergei wrote:"Руководства по технической эксплуатации N 10 книги 1"

T-10 is also known as Flanker A :wink: aka Su-27


F16=F16A

can you just post the pictures on here ? i cant actually see it in the link
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