TR Aircraft Carrier and Amphibious Ship Programs

[No Name]

Is there a reason why Turkey's aircraft carrier doesn't have an angled runway?

 

[B_A]

Is there a reason why Turkey's aircraft carrier doesn't have an angled runway?

Dont have?

 

[Zafer]

Is there a reason why Turkey's aircraft carrier doesn't have an angled runway?

Because we need to use the whole length of the ship to launch some of our planes as we will not have catapults on the first incarnation of the ship. We do have an angled runway but it is angled inwards not outwards.

 

[Yasar_TR]

All military grade Marine gas turbines are derived from high bypass turbofan engines. This is due to the fact that in a high-bypass design, the ducted fan and nozzle produce most of the thrust. A turbofan engine is actually related to a turboprop in principle because they both transfer some of the gas turbine's gas power, using ancillary equipment, to a bypass stream leaving less work for the hot nozzle to convert to kinetic energy.

The most popular Military Gas turbine, LM2500 is derived from GE’s CF6-6 high bypass 55000lbf + class domestic airline aircraft engine. The newest version can develop 47000HP+ shaft power output.
Due to their high power density and rotational speeds, Gas Turbines impart to the ships on to which they are installed, quick sprint and sustained high speed capabilities. Also as their speed can be easily modulated and they can be quickly stopped and started, makes them very convenient.
Although they are thirstier than Diesels for sustained higher speeds, their advantages outweigh their downsides for navies like US’s where extra fuel consumption cost can be tolerated and accommodated.

So for Aircraft-Carrier Propulsion where higher sustained speeds are needed to assist with aircraft take-off and landing operations, Gas turbines are a necessity if nuclear power is not available. To move a behemoth of a ship like a carrier at 25+ knots speeds, you will use a lot of fuel. QE2 carries around 7 million litres of fuel. 4 million litres for itself and 3 million litres for the aircrafts she has onboard. That is supposed to last the ship for a 10000Nm range if used carefully at a sensible speed.

 

[Anmdt]

On the AC turbine propulsion:

A possible marine version of the upcoming Kaan engine will likely have more power than the GE LM2500 engines so a shift from 4 turbine engines to 2 turbines like the HMS QE2 can be possible given the amount of time there is to the building timeline of the MUG.

See this and let's talk again:

 

[Zafer]

See this and let's talk again:
View attachment 67649

What do you mean, diesel versus turbine efficiency?

 

[Anmdt]

What do you mean, diesel versus turbine efficiency?

SFOC curve of gas turbines is not linear, there is a reason why we have combined propulsion units instead of a single engine to do it all. To operate engines most efficiently at two desired RPM and power output. At cruise speed (maximum range) 2 50 MW GT would consume more than 4 25 MW (according to the given graph) thus lowering the available range.

There is also LM6000 (however i doubt if it is for military use) and Navies would have opted for this if they needed less engines.

 

[Zafer]

SFOC curve of gas turbines is not linear, there is a reason why we have combined propulsion units instead of a single engine to do it all. To operate engines most efficiently at two desired RPM and power output. At cruise speed (maximum range) 2 50 MW GT would consume more than 4 25 MW (according to the given graph) thus lowering the available range.

There is also LM6000 (however i doubt if it is for military use) and Navies would have opted for this if they needed less engines.

Turbines work with their best efficiency between 90% and 100+% throttle but for some reason the UK went for a twin RR engine. Probably because it is UK made instead of American. Same applies to us if we can have our own engines we can mix and match as we wish. Smaller engines with large engines and diesel with turbine. We need to make marine diesel engines for whips as well. There was an initiative about it which we haven't heard about in years.

 

[Anmdt]

Turbines work with their best efficiency between 90% and 100+% but for some reason the UK went for a twin RR engine. Probably because it is UK made instead of American. Same applies to us if we can have our own engines we can mix and match as we wish. Smaller engines with large engines and diesel with turbine. We need to make marine diesel engines for whips as well. There was an initiative about it which we haven't heard about in years.

It has 2 x GT, 4 x DE and IEP, none of these are driving propellers mechanically.