Aerodynamics

There’s no air drag or wheel contact to sap power and slow you down, so you can go Mach 5 through a long vacuum tunnel without so much as a sonic peep

After nearly a decade of unsuccessful attempts to increase Slovenia's wind turbine count beyond two, the latest ambitious venture, involving 56 turbines on the Pohorje Plateau meant to supply 110,000 households, has encountered its set of challenges as well.

The first generation of wind turbines, installed starting in the mid-1990s, is rapidly reaching the end of its lifetime and some are overdue for a replacement. It is estimated that about 775 wind turbines will have to be replaced by 2030.

“That first supersonic flight was such a tremendous achievement, and now you look at how far we’ve come since then”

Boom Supersonic may be forced to make its own engine for its ultra-fast Overture jet

Supersonic in the air and supercavitating under the water

“The simplest explanation for this is the new cars with less downforce suit some drivers better and others less”

Turkey's state-run aviation company, Turkish Aerospace (TAI), is building Europe's second-largest subsonic wind tunnel for testing the country's fighter jets.

"The wind tunnel is intended to be used in the development of indigenous, rotary-wing and fixed-wing aircraft, especially the Turkish Fighter," a press release read on June 18. 

Hesitation of the pilots and the air traffic controller, rapid change in wind speed and the age-worn runway at Istanbul's Sabiha Gökçen Airport have been pointed as possible causes of the plane accident which left three dead and 180 injured on Feb. 5.

President Vladimir Putin said on Dec. 24 that Russia has got a strong edge in designing new weapons and that it has become the only country in the world to deploy hypersonic weapons.