[Child of the 7th Age]

Since this has become rather a technical argument, can anyone tell me what the air-speed velocity of an unladen Balrog is? (That is, assuming he can attain the air...)

Lyta Underhill -

I would encourage you to look closely at this article that suggests a way to factor in the following variables: aerodynamic center of wing body combinations---lift, normal force, pitching moment, aerodynamic centre, upwash, drag.

Please note that this method applies for zero or near zero roll angle solely to balrogs with diaphanous wings. When predicted values were compared with experimental values extracted from the literature an accuracy of 10 per cent was indicated. This is illustrated for results in the angle of attack range of 20 to 25 degrees, and the ranges of experimental parameters used are tabulated. Such a method applies to both the straight or swept-forward trailing-edges of the wings, but has been found to be satisfactory for moderate trailing-edge as well.

For balrogs with non-diaphanous wings, please consult Fordim Hedgethistle's well known treatise "Vortex interference factors as Applied to Balrogs". Fordim's analysis takes the body-alone contribution (ESDU 89008 provides values for both First and Third Age Balrogs) and adds contributions from the wing (in the presence of the body) and from the change in body lift-curve slope due to the wing.

Hope this clears up any questions in your mind!