Looking for a technical term

**Ralph Jones[_2_]** · September 28th 09, 09:21 PM posted to rec.aviation.soaring

On 28 Sep 2009 18:15:03 GMT, Nyal Williams
wrote:

Is there a term for the difference between the angle of incidence of the
wing and the angle of incidence of the tailplane? I have heard/read
decalage used this way; however, wikipedia says decalage means the
difference between the angles of incidence between the two wings of a
bi-plane. (Thinking of that makes me think that extending Fowler flaps
turns the aircraft into a bi-plane).

Is there a separate term? Is this usage correct (Is Wikipedia just
incomplete?)?

Yes, Wikipedia is incomplete. Decalage can refer to a difference in
incidence angle between any two aerodynamic surfaces.

rj

**Mark Jardini** · September 29th 09, 06:46 AM posted to rec.aviation.soaring

I have also heard it referred to as "longitudinal dihedral".

**Nyal Williams[_2_]** · September 29th 09, 04:00 PM posted to rec.aviation.soaring

That's funny!

At 05:46 29 September 2009, Mark Jardini wrote:
I have also heard it referred to as "longitudinal dihedral".

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