Find NP and CG on a FSW canard with lifting body
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Find NP and CG on a FSW canard with lifting body
Howdy fellow designers, please let me “pick your brains” on a 4 engine FSW canard taking shape on my drawing board. What I have in mind is a ¼” grp sandwich fuselage plate onto which I will fasten all the hardware and then cover it with a coroplast “hood”. Two such plates have already been fabricated. Wings will be 3mm coroplast with wooden spars.
Now to my questions concerning how to “treat the fuselage” when calculating neutral point(NP) and then CG. As you know most design articles omit to treat the fuse as a useable flying surface in the NP and CG calculations, however in my case I think that would be a waste of valuable surface area and therefore I envision to:
1)treat the entire projected top view as one single flying surface
2)set the symmetrical wings at 0deg. AoA vs the flat fuse plate
3)foreplane will be fully articulating coroplast with sym. profile
4) fuse plate underside will be kept clean except trike undercarriage
5)NP to be “calculated” by the cardboard cutout method
6)and CG by adding suitable “static margin” such as +15%MAC
Well waddaythink all designers out there, please feel free to give me sound advise - I´m only a simple chemist dabbling in canard airplane design(this one will be my 15th or so..?)……Cheers/Harald
PS...moved this to here from thread with incorrect heading..DS
Now to my questions concerning how to “treat the fuselage” when calculating neutral point(NP) and then CG. As you know most design articles omit to treat the fuse as a useable flying surface in the NP and CG calculations, however in my case I think that would be a waste of valuable surface area and therefore I envision to:
1)treat the entire projected top view as one single flying surface
2)set the symmetrical wings at 0deg. AoA vs the flat fuse plate
3)foreplane will be fully articulating coroplast with sym. profile
4) fuse plate underside will be kept clean except trike undercarriage
5)NP to be “calculated” by the cardboard cutout method
6)and CG by adding suitable “static margin” such as +15%MAC
Well waddaythink all designers out there, please feel free to give me sound advise - I´m only a simple chemist dabbling in canard airplane design(this one will be my 15th or so..?)……Cheers/Harald
PS...moved this to here from thread with incorrect heading..DS