Vega
New Member
Hi
I'm new here, indeed first post and have question relating to the project I'm working on an 18 meter(ar 21) all electric, 2 place motor glider.
After calculating the wing fundamental modes and frequencies, the bending and torsion looked good but I was surprised at how low the fore aft frequency appears to be at about 5.5Hz. I appreciate that this mode is excited by the stability and damping about the normal axis, but I've not been able to find any guidance as to what typical values are a wing of this span/ar or excitation separations. The wing is sized statically for the anti drag load hence the concern is the potential dynamic response.
So does anyone on this forum have experience or guidance or "rules of thumb" for the design of wing fore aft frequencies?
many thanks in advance for any help or advice.
Vega
I'm new here, indeed first post and have question relating to the project I'm working on an 18 meter(ar 21) all electric, 2 place motor glider.
After calculating the wing fundamental modes and frequencies, the bending and torsion looked good but I was surprised at how low the fore aft frequency appears to be at about 5.5Hz. I appreciate that this mode is excited by the stability and damping about the normal axis, but I've not been able to find any guidance as to what typical values are a wing of this span/ar or excitation separations. The wing is sized statically for the anti drag load hence the concern is the potential dynamic response.
So does anyone on this forum have experience or guidance or "rules of thumb" for the design of wing fore aft frequencies?
many thanks in advance for any help or advice.
Vega
