JimoCooper
Posts: 45
Joined: 5/19/2003
From: Macon,
MO, USA
Status: offline
|
Ok fellas...Y'all sound like you've had all the same troubles with the TOP FLITE Corsair as I have. Well, I have some things to add as well.
First, the wing doesn't create more drag because it has two more degrees of incidence. Remember, that the wing finds it's equalibrium...and the nose moves over. The tail incidence in a negative...that brings the nose over more. So, with the tail and wing in the same plane, the nose would be down...hence "downthrust". THe corsair was not designed with a downthrusting firewall...like the Hellcat. Look at a hellcat's firewall, and you'll see what I mean. INstead, the downthrust is a product of the wing incidence. The plane has UPthrust when it's at the "Tail wheel touching attitude"...that old hog nose is up in the air. But no lift being generated in that configuration. So, when the plane is up on "tail flying, wings flying, take off" attitude, the engine now has downthrust...because the elevator and wing have ZERO incidence....RELATIVE TO THE WIND, even though the thrustline is now negative two. IF you rotate the nose, to where the thrustline is now zero incidence to direction of flight...NOW you have incidence....that generates lift because you've changed the camber of the airfoil...and increased pressure beneath...as well as suction above. A symmetrical tailplane generates ZERO lift, but change the incidence 2 degrees, and now you have lift. Put the thrustline back down to 2 degrees, and the incidences are zero again. The wings...main and tail wings...will find their equilibrium in flight...until you place some kind of action onto them...like deflect an elevator. Then you're changing the camber of the airfoil, but not the incidence. Lift is generated these two ways...change airfoil camber, or change incidence. The drag which is induced is nil. Downthrust on a plane like the Corsair provides leverage...look at the main wings like the pivot point of a lever...with the stab at the long end. Downthrust at the nose brings the tail UP...which gets those tailplanes up above the wing wash...and gives them effectiveness. The Topflite corsair slouches through the sky...it looks like it's lazy...slumped in the backside. The incidence change lifts that tail back up where it needs to be, plus changes your downthrust. You can't really put any downthrust into the topflight corsair, because then you don't fit into the cowling centered at the prop hub.
I love flying the things...they're heavy, and boy, do they go downhill. Y'all are right....you can't get them slow. I initiate my turns with rudder...then am almost always on opposite aileron through the turns to keep them coordinated.
|
Printable Version
All Forums >> RC Airplanes >> Aerodynamics >> Wing and Stab Incidence for the TF 60 Corsair Need Help 
Wing and Stab Incidence for the TF 60 Corsair Need Help - 
That wing saddle looks good, like I said can't wait to see it mounted with the new belly pan. 
Horizontal Stab -