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You’re in big error here. AL-31F 12,500 Kgf thrust (that is bench thrust as everybody knows) won’t be the same with the engine installed in the fighter, not even at zero speed. There will be thrust losses caused by the air intakes ducts, and these are considerable. Let’s suppose that air intakes-caused thrust losses for Su-27 are similar (as fraction of bench thrust) with the air intakes of MiG-25 :) Watch in the MiG-25RB practical aerodynamics manual, page 79 – it’s the air intakes-caused thrust losses. You can see, even at zero speed the thrust losses are as high as 26%! Watch at low speeds the lower curve – this shows how because the lower lip of the air intake is down (compared to “lip up” curve above) it decreses the thrust losses (by inhibiting turbulence forming that will lead to pressure losses in the intake ducts, and finally thrust losses). The lip will decrease thrust losses with more than 8%. Air intakes-caused thrust losses is a big deal indeed, somewhere in the manual it is said that if the plane is heavy (or is flying with only one engine) during landing approach and the pilot for whatever reason has to abort landing, and will power up but will have little excess thrust, to not forget that when will retract landing gear the lip will also go up and will decrease a bit the thrust, so is better to retract gear when higher-faster-safer. Also in the graph you can see how the bench thrust is almost reached at high subsonic speeds, and the way inlets starts producing thrust at high Mach. In the same book, page 63, R-15B-300 thrust, military 7,500, max AB 11,200. So we have 15,000 and 22,400. On page 267, in the text – takeoff thrust military 12,200, max AB 17,600. So the average takeoff thrust is 81% of bench thrust in military and 78% in max AB. In LockOn takeoff performance for supersonic a/c is already outstanding, no need to increase thrust here. The thrust is low only at high altitude. In MiG-29 manual it says AB takeoff will take 7-8 seconds. I think you can do that easily in LockOn. MiG-23ML/UB practical aerodynamics manual, page 345. Takeoff forces distribution. It is in that manual, R-35-300 engine is 13,000 Kgf thrust. All you can count in the graph at zero speed is 10,500. That is 80% of bench thrust. Coincidence? No. It is SAFE to assume that in takeoff condition supersonic fighter a/c have about 80% of the bench thrust. So the Su-27 will have about 20 tons takeoff thrust. There are also ejector nozzle flaps losses (airframe-mounted on MiG-23). Anybody not convinced yet is invited to have a more in-depth lecture of those two books, air intakes chapters.

Для всех энтузиастов - создателей железных кокпитов, и не только! Я и мой друг Nir Bar (Schredder) готовы представить вам следующую разработку: LockOn LCD v.1.0 (формат изображенных данных ко времени релиза несколько поменялся, но идея понятна) Мы поставили перед собой задачу - создание дешевого, простого в сборке устройства, для вывода информации из ЛО в реальном времени. Остановили свой взгляд на монохромных, текстовых LCD панельках 20х4, их нетрудно найти в продаже, и стоят они в пределах 25 долларов. Нир трудился над железной частью проекта, я написал софтовую часть :) Софт для дисплея совместим с LockOn Virtual Panel, по этому их можно использовать одновременно. Программная часть LockOn_LCD - это плагин для программы "LCD Smartie" - которая распространяется бесплатно, детали можно узнать из описаний в архиве. Архив с полным фаршем - описанием создания монохромного дисплейчика, настройкой софта (софт прилагается), и запуском этого всего хозяйства, можно скачать здесь: http://lockonfiles.com/modules.php?name=Downloads&d_op=viewdownloaddetails&cid=82&lid=880&title=LO_LCD%20v.1.0#dldetails С уважением команда LO_LCD - Максим Лысак (Mnemonic) и Нир Бар (Schredder)

OMG, a Dell mainboard without BIOS settings. When this also happens if he download and upload something for this critical hour then you can throw out the network controller. Also test other games in multiplayer for this period of time.

I don't really notice that there is ground effect in LOMAC... :huh: Came as a surprise to me as well. The aircraft should balloon during the flare if there's any excess airspeed crossing the threshold. Ground effect shifts the top of the curve up and to the left, thus increasing the lift coefficient and decreasing the angle of attack - which decreases induced drag.... IIRC my aero.:smilewink:

SwingKid, You've GOTTA read the notes man! :book: I've got a physical product, so it's pretty easy for me to use a ruler to follow the lines with appropriate spacing to interpolate data for 5k and 7.5k. You must also take SOME amount of drag into account. I used a default 10 Drag index for the pylons still hanging off the aircraft. Just removing the turkey feathers makes the starting drag index 3.7, then add the pylons LAU-114s, etc. and you'll get somewhere around 8, so 10 should suffice. I double checked the values I got from the Dash-1, but feel free to recheck things. A second set of eyes is always a good thing.

Rumous has it that ATI's XTX's are actualy perfoming worse than XT's because of the DDR4 higher latency, but beware that all benchmarks ever donne untill NDA is broken are dubious and contradictory. The data I have see till date seems to indicate 2900XT integrators beleive it will be very competitive failing only to beat the NVIDIA's top dog 8800 GTX 768MB while the XTX will be out of their initial portfolio. The projected price tag makes it a very interesting proposition I wouldnt count it out.

Lets wait for the final card and 3 month old drivers ;)

Very interesting stuff Rhen - well done Sir! Wow ... so, a 15 should get to 40k' in about 60% of the distance when flying the -1 profile. It'll be interesting to see how this 'slight' change pans out when flying at 40k' in terms of available power ... where I tend to play despite the problems with TWS. Yo-Yo ... Given your work on this I hope ED go far!

Another one bite a dust.

Yo-Yo, Thanks for being opened-minded about changing "your baby" of all these years to reflect reality. You're willingness to change your opinion speaks volumes about ED and where you're heading. Thanks! @ Kula: Just to visually point out what "slightly" looks like Here's a graph. I just got around to plotting the data vs the Dash1: This is a chart of Distance (in NM) vs Altitude (Ft) comparing the Dash1 data (expected performance) vs LOMAC's F-15 at MIL power and 40,000Lbs, clean aircraft. The lines should mirror each other if the simulation meets expected Dash1 performance. It's a better way to show where the discrepancies lie. As you can see, performance begins to diverge at 10,000ft (+/-1500ft) and the LOMAC aircraft becomes quite underpowered. The other area of concern is below 5000ft. This area appears underpowered as well, which mirrors my qualitative analysis that in the pattern, the aircraft doesn't perform as it should either.

Something just doesn't add up with these early tests.... This test is telling me that 210 more mb of GDDR4 memory (2900XT vs 2900XTX) is only delivering 1.7 better frames on Elder Scrolls played at 1900x1200... That just doesn't seem right to me. Hell, look more closely.... this test is essentially screaming "do not buy a 2900xtx...get a 2900xt!"... Why would AMD build cards that perform like that? Beyond the Catalyst version whats the software test bed? XP... Vista? etc... And i'll make a short point about any fan boi that loves their brand... Competition is king... wish for it... AMD need some wins for us all.

Hmmm i doubt the ATi drivers are even mature enough yet for this card, what version of Catalyst were used in these tests?