Original Posted By: TLC62770
EAA has book that can be purchased for about $ 7.00 It is called "PropMaking for the Amatuer" by Eric Clutton.Easy to read, easy to understand, HIGHLY recommended.Greg CardinalP.S. I just did a quick calculation of the strength of the spar straps.Assuming 4130 at a tensile strength of 90,000 psi and a safety factor often, the straps should hold up over 8000 pounds. This does not take intoaccount the shear strength of the bolts.>>> Steve Eldredge 04/14/98 08:38am >>>On Tuesday, April 14, 1998 5:33 AM, TLC62770[SMTP:TLC62770(at)aol.com] wrote:> Hi Steve> I'm confused . what does the numbers on a prop mean ? I hear the first> number means the lenght of the prop and the second number means thadistant> the prop pulls the plane ahead in one revolution . I have also heard the> second number means the angle of the pitch of the prop . Please help to> straighten me out on this .I believe that it depends on the prop. I think in almost every case the first number is the lenght of the prop. On the props I am familiar with (Sensenich, Falcon, Culver, Flotrop, etc) the second number is thedistance the prop slices through the air in one revolution. (not including any inefficiencies or slippage, which there is a significant ammount of course) However, some props especially ground adjustable, andvariable pitch ones measure pitch in degrees from neutral. I'm not sure how they number these props since I imaging they have to take into account airfoil section, hot boots, q tips, plan form etc. Anyone?SteveeHi McCaully? Yea I'd like a 5 blade simitar Q-tip hot section variable hydraulic prop. Oh yea got anything that;ll fit my Model A?________________________________________________________________________________