can you predict the flying characteristics of the design

[campcrafter]

can the flying charactaristics of this design be predicted.

wingspan 96inches ( rectangular)
chord 24 inches
fuselage about 42inches

the plane should be powered by an electric system, so what would be the motor esc prop used.

should also have a high payload carrying capacity about 3kgs



thanks

[Shredz]

The aspect ratio is 4. This model will fly slow at high angles of attack but this is dependant on how much thrust is available. Its' unique stall characteristics will be dependant on wing configuration (conventional or canard), weight, COG, and the selected airfoil but for a conventional wing configuration, it'd be a deep stall.

This (at a 13.2oz/ square foot wingloading- which is double what youve sited the payload weight is) is still a lightly loaded wing. You need more info about how much the finished plane is going to weigh. Much depends on the role in which you intend to fly this plane (aerobatics/3D, putting around or .....?).

Check out comments by Rodney about Wing Volume Loading (WVL) here (http://www.rcgroups.com/forums/showthread.php?t=926336)

Hope this helps. T

[campcrafter]

thanks shredz,

i want to carry a heavy payload, like a handycam, digicam, etc. i will not be using it for any aerobatics. It is intended to fly steady, stable and take off and land in very small areas. The all up weight would be around 2.5 kgs.

[eye4wings]

Seems to me that you need to optimise your structure weight so that you don't waste material putting strength where it is not neccessary. With a constant chord wing you are in a position to do this without making the job harder than it has to be.
Most designs have wing ribs at constant spacings and with spar members the same width for the whole span, which provides redundant weight towards the tips where the strength is needed less.
If you have the ribs closer together at wing root and further apart at the tip you do not need to web the spars so heavily at the root. You need use little webbing because the spars are stiffened by the ribs. Also spars can be tapered to almost nothing at the tip.
If you pay attention to details like this you can save quite a lot of airframe weight which you can therefore use as payload. I've done this exercise several times and have not managed to break a wing in flight yet!
It is amazing how much we over-design into models.
Always remember that you can do away with about half the structure that would be in an IC powered design because our motors do not have a piston trying to shake the model apart all the time.