Září se nám blíží ke konci a s posledním pátkem tu máme opět zprávy od ED.

Hornet, Persian Gulf Map, a Su-33 Víkend zdarma!

 

Počínaje pátkem a konče 1. říjnem 2018, můžete zdarma vyzkoušet DCS: F/A-18C Hornet, DCS: Perský záliv a Su-33 pro DCS World. 

DCS World e-Shop

DCS World Steam Edition

DCS World Otevřená beta a aktualizace

Tento týden byla vydána aktualizace pro otevřenou betu ve verzi 2.5.3.22176.

Klíčové prvky:

  • SA-2 SAM, Rapier SAM, HY-2 Silkworm Proti lodní střela a P-19 vyhledávcí radar přidáno
  • Persian Gulf Map aktualizovány ropná pole Sheikh Zayed Grand Mosque, a Aldar Velitelsé budovy. 
  • Obsahuje novou mini kampaň pro Hornet.
  • Hornet radar vzduch-vzduch vylepšení zachycení cíle při provádění těžkých manévrů, dále se na tom pracuje.
  • Mk-82Y (high drag with ballute) přidáno do inventáře Hornetu.
  • R-77 / AA-12 střely vzduch-vzduch vylepšeno navádění. 
  • Mk-20 a CBU-99 Mk-118 efekt submunice vylepšen.
  • Několik AJS-37 Viggen přídavků

zde:  complete change log 

Aircraft Flight with Folded Wings Explanation

With the release of DCS: F/A-18C Hornet, we’ve observed some confusion and false-assumptions regarding how an aircraft can fly, or even take off, with its wings folded up. The answer: physics.

For folded-wing aircraft’s flight characteristics, we conducted calculations for the wings and stabilators in XFLR5 software. The calculations were done using VLM (Vortex Lattice Method) with a non-viscous flow model. The program then determines the characteristics of the linear area of lifting force dependence based on the angle of attack. For horizontal flight, we have the following equation to calculate how the forces are balanced in the vertical plane:

pv2/2 SCL = mg

The calculations show us that the folded wing configurations results in a 30% reduction in the coefficient of lift. To compensate for this reduction in horizontal flight lift, we need to either increase the angle of attack by 42% or increase the velocity 19%. Because the folded portion of the aircraft resides behind the center of gravity, a folded wing configuration results in reducing the negative pitching moment, which will also result in a reduced rotation speed at takeoff.

Initially, we didn’t take into account the fuselage, stabilators, and flaps lift capabilities, which all add to the total lifting force.

Unfolded wing

Folded wing

For an aircraft with non-folded wings and mass of 35,000 pounds and 8 degrees of angle of attack, the velocity to create the lifting force would be 186 knots without taking into account the fuselage, stabilators, and flaps. For an aircraft with folded wings and a mass of 35,000 pounds and 8 degrees of angle of attack, the estimated velocity for creating lift is 222 knots (i.e. 186 +19% = 221,34 knots). In our model, the velocity for a mass of 35,000 pounds and an angle of attack of 8 degrees is 205 knots due to the fuselage, stabilators, and flaps.

Sincerely,
The Eagle Dynamics Team

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