Discussion in 'Hangar Flying' started by Speedboat100, Aug 15, 2019.
Adverse yaw is caused by the ailerons, not the rudder.
I hate to say it, but it's almost a "buzzword bingo" sort of situation. The OP uses a lot of terms to claim there's something wrong with the Evektor, but doesn't seem to understand what the terms actually mean or whether the features stated are actually out of the ordinary. "Adverse Yaw," "Area Rule," "Rudder authority," "Bigger rudder," "straight wing," etc.
I almost broached that but figured that he was already badly confused since he was conflating the blanketing of the rudder by the elevator with "prop wash".
It seems like Speedboat really needs to go read up on aerodynamics and light aircraft design before this conversation goes much further. I would suggest Raymer's "Simplified Aircraft Design" and Thurston's "Design for Flying" as starting points.
A good place for SB100 to start is a NASA basic educational site: https://www.grc.nasa.gov/www/k-12/UEET/StudentSite/vocabulary.html
High performance aerobatic planes are supposed to be marginally stable, like fighter aircraft, in order to get the needed maneuverability. In fact, modern jet fighters are so unstable that they can not be flown by the pilot. The pilot tells the computer what he wants and the computer does the actual flying.
Agree with that, but I don’t understand how that relates to my post that you quoted with your post.
Right...but a rudder like that causes a roll to left if you wanna turn right. Adverse roll perhaps ?
I know that "poor mans area rule" is actually pressure gradient matching ( in subsonic aeroplanes ) ! It is a bit sad that none of you understood this phenomena.
No way to tell...but loss of directional control was the issue in many cases ?
Can you enlighten us with those design factors ?
I can see here ( english summary ) that 96 km/h stall speed is also very dangerous ( Cora 200 Arius F ): https://turvallisuustutkinta.fi/mat.../2013/e9Oc5u25v/Tutkintaselostus_L2013-03.pdf
A very dear friend of mine perished in this as a passenger.
I assume you're referring to an aileron-like effect when the rudder moves, but how is it different on the Evektor than any other airplane? If you're claiming the plane's rudder is too small, would it have LESS of the "Adverse Roll" effect you're concerned about?
In any case, in just about all normally-configured aircraft, pressing a rudder causes the plane to roll IN THE DIRECTION of the rudder press, not "adversely."
I normally don't ask this, but I think this time I must: What is your level of flight experience? I'm sorry, but a lot of your questions seem to deal with obscure theory without seeming to understand how airplanes actually work.
Your sneering reference to those who are honestly trying to answer your questions ("It is a bit sad that none of you understood this phenomena") makes you look a bit trollish. It looks more like you're just trying to bad-mouth an aircraft rather than seriously discuss the issues.
Ron the position of the rudder is well above the centerline of the short fuselage...it is pure physics. My flying hours are irrelevant in this. They are very low..mostly R/C models.
See this accident rate: https://aviation-safety.net/wikibase/type/PISI
Long tapered wings...high wing and long tail with large rudder.
Only 3 fatal accidents ( 15 times less fatalities per similar sized fleet compared to EV-97 )...catch my drift ?
That explains almost this entire discussion and why you’re not grasping how real planes work which we have repeatedly explained to you.
I am sorry about your friend but you’re doing a disservice by being stubborn and refusing to listen to those with more knowledge and applicable experience. The only thing that you’re doing is making it pointedly clear that you don’t even understand the most basic “physics” of how an airplane flies.
Hand on the bible SVSUSteve...would this make the directional stability worse or better ?
Give up trying to assist ...
Sorry BCJ. You wanted to teach me...and not advance aviation safety...I am sorry.
Here is a good and sound vertical stab and a rudder.
Does someone disagree ?
Tapered wings and a large rudder.
Yup. I’m out.
Yes I am sorry...I understand that I have not used the correct term for adverse roll...and SVSUSteve has a good point about the planketing.
I only try to enhance the safety...with limited means...seeing what I see is wrong...and reading what clearly indicates a problem.....and speaking openly about it.
I find this as a fine example of a low wing well organized: https://en.wikipedia.org/wiki/Scottish_Aviation_Bulldog
...and where is Autoreply these days ?
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