CG Limits Help

[gutboy17]

I'm needing some help or direction on where to go to find an answer to CG limit question I have.

The problem is I'm trying to determine the FWD and AFT CG limits on a WWI biplane replica. I've been looking in my old school literature for an equation(s) and required knowns (ie. wing size, profile, distance to MAC of the tail, etc.).

Any help on where to look for the above info would be greatly appreciated.

 

[gontek]

Of course component weight, arm, moment are needed for calculating. Here is a trick for you to get close:

For a tail landing gear layout, it would be required to be 15° (fore) and 25° (aft) behind a vertical plane intersecting the points where landing gear wheels touch the ground, as the plane rests on the flat ground.

The vertical coordinate should be 25° from the Y-plane of the landing gear wheel centerline along the centerline.

That makes it really easy, all you have to do is measure.
I don't think it should be any different because it is a biplane.

(Roskam, Jan - Airplane Design Part IV).

 

[rb1957]

i guess all the flight manuals have disappeared by now ... gone to dust ?