VIRTUAL FLIGHT LABS ▪ PROPULSION LABS ▪ THEORETICAL AERODYNAMICS ▪ MoTIS SCIENCE LAB ▪ NEO CONCEPT FLIGHT PROFILES
|TO. V SPEEDS||VX/VY TESTING||GRD HANDLING||TO/ DYNAMICS||RANGE TESTING||GLIDE TESTING|
|CRITICAL LIMITS||WING DYNAMICS||WING LOADING||WEIGHT/BALANCE||STALL TESTING||STRESS LIMITS|
|CROSS WIND TESTS||AC/ CHARTS||WEATHER TESTING||CRASH TESTING||ENGINE DRILLS||ENGINE TESTS|
|TAXI TESTS||ENGINE OUT TESTS||MACH TESTING||FIRE TESTING||ATTITUDE RECOVERY||GEAR TESTING|
We have waited for a long time to get down to business in this department! This wing is part of the MoTIS EXCEL FLIGHT LAB! You are about to see the how's and whys of why we design an aircraft! From V speed data gathering to full range and endurance testing with full calculus equations and all, we will push the boundary layer of virtual testing to the limit!
M100 TAKE OFF V SPEED TESTING
TODAY'S BETA TESTING WAS CONDUCTED BY WILD WILLY BILLY L!
A DESIGNER/TEST PILOTS DEVELOPMENT PERSPECTIVE!
The take off of any jet is covered under FAR part 25 (Transport category). It should be the job of every neo concept developer to follow standard real world potential for the design of all transport category virtual airliners. Today we are discussing with team MoTIS development staff what are some of the first things that we need to get straight when developing a new aircraft to get her airborne! Once we work out what will be the main weights of our empty aircraft, then we can get down to some serious business for why we build aircraft in the first place, TO SEE THEM FLY!
EQUATION STATION AND THE AIRCRAFT CFG COMPONENT
With the NASA foil sim it make calculating the proper v speed a snap! the X PLANE blade analysis engines give as the need program to calculate the correct NACA values for all MoTIS neo concept aircraft design. Team MoTIS uses X PLANE only to gather data for our MSFS builds! X PLANE in the most awesome realistic simulator form a professional stand point. So we use it to gather the data for our MSFS creations then use this data along with numerous other aerodynamics software kits to build a complete data picture of what we want to do in our MSFS creations. Then we take this data and code the aircraft CFG files in MSFS !
SEE OUR ARTICLE ON LIFT TO GET OUR DEVELOPMENT DRIFT HERE:
Important: All Calculus and aerodynamics equations in wing sections were done by MoTIS Founder/CEO Otis Watson
TIME TO FLY V0 AND READY TO GO!
Our mark at V0 speed is where the aircraft has been safely taxied out to the air field and is loaded at its pre take off weights! WG=WE + WF +WP Weight is really a sneaky little thing called force directed toward the center of the earth! F=MA= W=MG!!!
ACCELERATION or A=dV/dT and F=M(dV/dT), as mass is constant for a give object of shape and dimension X, then F=X(dV/dT)
Do not forget that at some point we need to make F=W and then have F>W! If we want to get airborne that is....
so we build our creation so that L=CL x(1/2density)V Squared x S can over come W=MA! or as we say at team MoTIS
As take off is a lesson in turning horizontal engine thrust=F=M*A with forward flight into lift=L =CL x(1/2density)V Squared x S, by reduction in air pressure by increasing air velocity over the concept wing structure, this make lift and the negative force called W, is canceled in a process known as dynamic equilibrium of opposing forces! Of course in the aircraft CFG its a simple matter of code alteration but this is how it works in the real world and is simulated in general!
So indirectly engine thrust causes the BERNOULLI effect and the BERNOULLI effect cause the lift effect. which over comes the weight effect of gravity!
THRUST INCREASE>BERNOULLI EFFECT>LIFT EFFECT INCREASES>INCREASE IN LIFT DRAG> WEIGHT TO LIFT EQUALIZATION AND LIFT INCREASES TO BEYOND STALL SPEED-OR VS!
The Mr. B effect (BERNOULLI) is a pressure velocity law for internal pressure of dynamic fluids in basic...
So when we design this concept wing to make her ready for her share of the flight work load we need to do MAD work or we would just be developing fantasy aircraft with out any back bone!
You see when we decide to build an aircraft, almost the whole design and development process starts here in the weight department and the center of gravity department, as we need to design the structure that will balance and over come weight in such a way that when we add speed to the equation we will have the right equation for getting the lift to over come the loaded weight of the aircraft at V0!
As you are speeding down the run way what you are doing scientifically with the M100 is trying to create a proper pressure differential across the wing to generate a lift imbalance! All acceleration in the universe is the result of imbalance! these imbalances create moments and moments give us data as to motion dynamics!
Vs is the actual stall speed of the aircraft! Once we have settled on a wing design for our creation (We will get to how we have done this in later tester presentations), we need to calculate a stall speed for our aircraft. How do we do this you may ask?
Like so: WG=WE + WF +WP, W/S=WING LOADING RATIO. Knowing the wing to weight ratio for an aircraft sure dose help in deriving the proper design possibilities for an aircraft in question. S=W/(W/S). All of these equations have a major effect on the v speeds of an neo concept airliner as the speeds are directly related to the lift that is generated over the wings at take off that will lift the aircraft weight into the sky at the proper safety speed. The stall speed is really the
YOU CAN DO IT AIR SPEED!
I like to think of the stall speed as the lift to weight equilibrium number! just enough lift to confuse the aircraft into staying in the air and just enough drag and weight to make the aircraft play a dangerous game with the grim reaper at razors edge.
If your designs stall close to the ground then you tend to die! Unless you are doing a controlled landing as that is basically what a landing is, a controlled stall into terrain-THE RUNWAY that is !!!! LOL! So we need things like flaps and chord increasing devices to keep this death thing from happening when flying at or near stall speed!!
That is why we don't pull back at stall speed VS in an airliner but instead rotate at an operational speed where we have some live beyond the stall speed zone.
From a designers perspective its the no law suite zone when building an aircraft!
VMC IS A CRITICAL SPEED THAT WE CALCULATE EXPERIMENTALLY! This is what we call the oh MY GOODNESS speed when things can go wrong if you lose an engine at take off and still be able to operate the aircraft safely and make good pilot judgments!
V1! the speed of champions! When we design any aircraft its at this speed where we say to our selves as student designers, will this thing behave correctly in the simulator programs that we have made our great creation for! These speeds are more operational decision speeds in all airliner class aircraft but from a design stand point its v1 that we can see if we got the right stuff to ram our creations into the air with dissymmetrical thrust and an aircraft under normal power with an engine out! In essences its the lord will forgive us if we mess up a bit speed!
When you reach greater then stall speeds or the speed that we call the grim reaper, then you are ready to do alter your angular position! To all fans of the cycle or any circle, you are mathematically make the aircraft at the center of gravity a rotating radius of sorts! i.e..
VR is the design speed where we have managed to say to our selves that we had at least enough knowledge to not die from a ground incursion and that if we crash a new design we can at least have the honor that the aircraft flew for at least a fraction in time! No seriously, once we have exceed stall speed we are ready safely to transition to flight and see of our lift equations and wing designs are able to hold up under the weight=MA-no pun intended! during standard test flight we will have our beta test pilots do the first ground run and abort all first test flight take offs! This allows us to get the Vsp data perfect!
Never let any aerodynamicists fool you, flying is all about center of gravity and the equalization and controlled imbalance of forces! From a pilots stand point V2 means we are up and moving higher, but from a neo concept development stand point it means that we have got the right NACA values for the wing, the proper three dimensional wing to hold the aircraft in equilibrium and we can come to work the next day and keep our jobs!!! lol!
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