----[Please read http://ercoupers.com/disclaimer.htm before following any advice in this forum.]----
I don't know!!! It's been my experience that most pilots, other than Ercoupe pilots, are quite full of shi-!. In a nose high attitude, all of that Sh-- will definitely shift rearward, and seriously adversely effect the CG. Larry ----- Original Message ----- From: "John Cooper" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Sunday, February 24, 2002 2:52 PM Subject: Re: [COUPERS] More Ercoupe garbage. > ----[Please read http://ercoupers.com/disclaimer.htm before following any advice in this forum.]---- > > In a message dated 2/24/02 1:24:30 PM Eastern Standard Time, [EMAIL PROTECTED] > writes: > > > could be wrong here, but it seems that a large pilot and passenger, will > > actually have a c.g. shift to the rear in this nose high attitude. > > No, you're not wrong. But the shift rearward is only relative to an observer > on the ground. The CG of the airplane has not moved one bit relative to the > airframe. In other words, if you draw a side view of the airplane and mark > the CG both fore and aft, and "up and down" then rotate the picture, the > position of the CG within the airframe has not moved. > > The thing that matters is the position of the CG relative to the center of > lift, which is generally expressed as a percentage of Mean Aerodynamic Chord. > Even upside down, this relationship does not change. > > Having said that, I guess if there were an aircraft where the CG was very > high above the wing, and the CG were very close to the center of lift, then > raising the nose could conceivably shift the relationship of the two relative > to the gravity vector enough to affect the stability of the aircraft, but > then that's why we have certification limits in the first place. Such a > plane would very definitely be loaded outside its envelope. Bottom line, in > a certificated aircraft, loaded within its certification envelope, raising > the nose will not shift the CG far enough to make the plane unstable. Carry > this thought a little farther and you can see that if the CG is in that > relative position (boy, I wish I had a white board...) the wing would lift > and the CG would fall until the plane rotates backward and the nose is once > again pointed down and the CG is once again "forward" of the center of lift. > Now, once again, after doing a bit of a tail slide, all is right with the > world. Eventually, any plane will do that as long as the CG is in the right > place to start with. > > Clear? (Yeah, right!) > > John > > > ==^================================================================ This email was sent to: [EMAIL PROTECTED] EASY UNSUBSCRIBE click here: http://topica.com/u/?aVxiLm.aVzvvT Or send an email to: [EMAIL PROTECTED] T O P I C A -- Register now to manage your mail! http://www.topica.com/partner/tag02/register ==^================================================================
<<attachment: winmail.dat>>
