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AI-25 engine used in Albatros L-39 plane has a given life cycle of 4000hours. OK it is not really pushed hard. It powers a trainer aircraft. It has a never go above speed of 980km/hr. And a maximum top speed of 750km/hr. So it is well protected from sustained extreme uses. I wonder how this...

Exactly! That is what I meant. It may look like a “residual” amount of hot thrust not worth mentioning and even though “most“ of the thrust is coming from cold air thrust, you can not discard the thrust provided by the hot core. Zero hot portion thrust is never going to happen. Even in...

Nice view of a monster in the making from IDEF 2021

Ukraine uses super alloys in their blades. Russian Saturn AL31 engines were the same. They only started using single crystal blades in their “F” class engines , like AL31F and AL41F. Using single crystal does not solve all the problems though. The blade design has to be correct with the right...

Yes and No! Most of the thrust is produced by the fan. In a turbofan, the thrust it produces very much relies on the amount of air that by passes the engine core. Modern engines like the one used by the A320 neo, the Pratt and Whitney PW1000G has a by pass ratio of 10:1. That means, for every 1...

For a subsonic passenger liner with large fans and high bypass ratios, cold thrust created by the fan constitutes up to 75-85% of total thrust of the engine. For a low bypass turbofan fighter engine, capable of supersonic speeds, this could be as low as 30%. These values would change greatly...

Professor Aksit, is explaining the basics of gas turbine engines in it’s simplest form. As explained before the Turboshaft and turboprop engines convert jet propulsion to torque generation. (Hence HP ratings.) A gas turbine engine pulls air from outside and pushes (compresses) it in to...

TS1400 engine is a turbo shaft engine. It was produced as a replacement of Honeywell CTS800 Used in T-129. Unfortunately this engine has a radial flow compressor section. To produce a turbofan from this engine the compressor section and the turbine section will have to be redesigned with axial...

F404 has a number of variants. These are: F404-GE-102 : 17700lbf F404-GE-IN20 : 19000lbf F404-GE-RM12 : 18100lbf The rumour in the grapevine at one point was that, a 19000lbf level engine was to be used on Hurjet. But it is now becoming more likely that the 17700lbf engine will be...

You can not have HP for a turbofan or turbojet. But you can have lbf or KN thrust. Like tj300. (Turbojet 300lbf thrust) Physics dictates that a turboshaft and Turboprop engine‘s output can be quantified in “shaft horsepower“. But a turbojet and turbofan engine’s output can only be quantified in...

It has a lot to do with airframe design. But; Taking TEI’s way of naming it’s products, TF6000 relates to an engine that has 6000lbf thrust. If that is dry thrust, then we are looking at an engine with 9-10000lbf thrust with afterburners. Czech Albatros L-39 has a 3800lbf AI-25 turbofan engine...

That is where imagination comes in to play! 😀

First part I can agree with you. We all have imaginations! Second part is a pedantic response. Designers of aircrafts have found that certain surface shapes will not send back signals back to the radar sending them. So what makes a shape, free from radar signals being returned? This is where we...

Is it me imagining or is that body shape looking like stealthier than TB2?

These pictures have been subjected to heavy photoshopping. The Satcom bulb on the top body has been masked. The blacked out areas may have contained something that they want away from prying eyes, at this stage. Check out the right wing. Blacked out area is not as solid as the one in right wing.

German scientists have developed one of the most reactive non-nuclear explosives known to man. It is called “aziroazide azide”. This is so active and unstable due to the 14 nitrogen atoms that are connected to each other and want to form expanding nitrogen gas, that even the slightest touch...

1kg of Semtex or 1kg of C4 or 1Kg of C2 or 1Kg of TNT , or 1kg of nitroglycerin ; They are all same weight. But differ a great deal in explosive power. There is also the penetration power of an explosive. Amount of shock wave they create; Amount of heat they create. Some draw the air out...

You may be correct from your own perspective. But from the article I have shared, what I understand is that US company has developed a ”more lethal” explosive for the “next generation” 2+ER version. It is NOT the same type of explosive used in previous Harpoons. It clearly compares this one to...

Standard Harpoon missile’s warhead was 221kg. New Harpoon Next Generation has a warhead of 140kg with much more destructive and lethal power than the standard one. Quote: Harpoon Next Generation boasts a host of new features to improve performance. It will have an increased range of 134nm, a...

This was discussed in detail in previous page. See #1926