silent 3 bladed prop - I got the equation curves down in inventor.

prusaprinters

<p>Uppdate 29.11.15</p> <p>Added 9X4.5 blade sett, (Prop4) i hadent done this for a while so i hope i got it right.</p> <p>I finally got the equation curves in inventor all set, if somone wants a spesific airfoil profile let me know.</p> <p>This has less tip turbulence and makes a lot less noice</p> <p>I use it as a silent replacement for 5-7" props for my quad.</p> <p>3 mm axel</p> <p>print as solid.</p> <p>I print it on hight resolution and treat it with acetone vapour</p> <p>I have upploaded an inventor file with a naca profile equation curve, feel free to make any wing profile by simply tweeking the numbers.</p> <h3>Instructions</h3> <p>Equation curve in inventor.</p> <p>thick<em>chord</em>t<em>5</em>(0.2969<em>sqrt((1 in)/chord)-(0.1260</em>t<em>1 in)/chord-(0.3516</em>t^3<em>1 in^2)/(chord^2 )+(0.2843</em>t^5<em>1 in^3)/(chord^3 )-(0.1015</em>t^7*1 in^4)/(chord^4 ))</p> <p>where:</p> <p>• c is the chord length,</p> <p>• x is the position along the chord from 0 to c,</p> <p>• y is the half thickness at a given value of x (centerline to surface), and</p> <p>• t is the maximum thickness as a fraction of the chord (so 100 t gives the last two digits in the NACA 4-digit denomination).</p> <p>You need to add chord and thick as variables in inventor (the fx button) before compiling the equation curve,</p> <p>PS ! The part file mustbe in inches!!!!!!</p> <p>The foil must be made in 2 sections one for the top curve and one for the lower just add "-" in front of the lover airfoil curve.</p> Category: R/C Vehicles