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**Propeller Design:** was always the most complex, least understood problem in Flight and Aerodynamics - until now. The author, Jack Norris and Dr. Andy Bauer found 7 historic giants, finally **3, Betz, Goldstein & Theodorsen, BGT**, their **essentially exact, rare genius, 3D math** solution, 1948,** never understood**.

**The Book Explains: Theodorsen was the acknowledged Math Genius of WW II NACA Langley.** Goldstein Theodorsen essentially **exact 3D math**, perhaps the most elegant, impressive Engineering solution in History, ends in a **Simple Blade Loading Chart**, never understood. **That Loading, optimally used, directly results in the Half Teardrop Loading you see on the cover. Perfect Blade SHAPE, Pitch, Twist, creates Perfect Radial Loading, Perfect Props*!**

**Norriss 6th Law, The All 6 way Optimized Prop: 1. BGT Math creates Min Induced Loss, throwing air**, [ If we simply use an Optimum Angle of attack, thus CL, at all radii, (from Pitch & Twist), we get

If you are a **Propeller Designer, Manufacturer**, this Book teaches what we **never knew, never understood** - The Rare Genius, essentially exact Betz Logic, Goldstein, Theodorsen Math, the Fact that **we never saw the core issue in Propeller Design**, That a Rotating Wing is a THRUST LOSS, TIP VORTEX LOSS DISASTER, that essentially exact BGT Math ideally counteracts that, Ideal Radial Blade Loading, exact blade Shape, Pitch, Twist!
Of course we use Ideal Airfoils, thicknesses, sweep tips, if too close to sonic. **Reno takeoff proved - We lose by trying to be tricky, changing angles, using wider tips. BGT is essentially EXACT*!**