) /#/#/!/#Yx"o1l!o1>J  J- #SKIN_PLIES #_BLADESES   #_SPARSES   BLADE_CG%S   BLADE_CG_CIRC BLADE_CG_RAD BLADE_CG_VEL BLADE_LOADL BLADE_WEIGHT DIAMETERGHT RPMETERGHT SAFETY_FACTOR## SKIN_CS_AREA SKIN_PLY_THICK SKIN_PLY_WIDTH SKIN_STRENGTH   SPAR_AREAGTH SPAR_SIZEGTH   SPAR_STRENGTH TENSILEENGTH   TOTAL_STRENGTH!! WEIGHTTRENGTH CBCOPYRENGTH RN0PYRENGTH!  ? @VLBLBq+q+q+ Arial Arial Arial Arial! Arial" Arial$ Arial!  "$ "2Normal Undefined"2Normal Undefined"2Normal Undefined"2Normal Undefined"2Normal Undefined"2Normal Undefined"2Normal Undefined"2Normal Undefined"2 Normal Undefined"2 Normal Undefined"2 Normal Undefined"2 Normal Undefined"2 Normal Undefined"2Normal Undefined"2Normal Undefined"2Normal Undefinedq0*  @@@       @@ ! "!#@@@@ $%$&%'&(')(L ` ` ``````#` ~'.'PROPELLOR BLADE LOAD STRESS CALCULATIONS'by Nigel Field ''Template reviewed by Marc Zeitlin^INPUT DATA ^UNITS^COMMENTS'DIAMETER| 'in.1'Propeller Diameter, insert desired diameter'RPM (max)&'Max RPM for design safety factor'TOTAL WEIGHT 'lbs9'9 lbs typical for 100 HP 3 blade, 180 HP use 12 lbs 'NUMBER BLADES  'As many as you wish 'BLADE C.G. (% of Radius) P? 'Conservative default. Actual C. G. is approx. 33% radius 'TENSILE STRENGTH   'psi= 'E Glass with good layup, S glass would be 20 % stronger 'SPAR DIMENSIONS  'in.@ 'Assumes square cross section ie .25 by .25, can be larger 'NO SPARS per BLADE  'Two per side per blade'SKIN PLIES per BLADE'At root and hub only'SKIN PLY THICKNESS  'in.'Standard Uni Cloth'SKIN PLY WIDTH 'in.?'Typical value. Note that skin covers 6 inch hub dia face9'plus overlaps on circumference between blade shanks^CALCULATIONS'Radius of Blade C.G.)DDDDDDD? 'ft"'Calculated (Diameter/2/12) 'Weight of Individual Blade@  'lbs4'Calculated (Total weight / number of blades)!'Circumference of Blade C.G.c@&'ft 'Calculated (2*PI*Radius) 'Velocity (V) of Blade C.G.!˱U&@x 'ft/sec)'Calculated (Circumference*RPM/60)'Centripetal Blade Load-V @E( 'lbs'Calculated (M*V^2/R)+'[where mass = slugs at 32.2 ft/sec^2]^STRESS DISTRIBUTION'Spar Cross Section Area!?   'in^2='Calculated (Spar dimension^2 * number spars per blade)'Tensile Strength @  'lbs+'Calculated (Area * tensile strength)'Skin Cross Section Area$GzG? 'in^29'Calculated (Width * thickness times number plies) 'Tensile Strength @  'lbs+ 'Calculated (Area * tensile strength)!'Total Tensile Strength!~@  !'lbs0!'Calculated (spar + skin tensile strength)#'SAFETY FACTOR AT HUB#2n@!<#'Calculated (Tensile strength/Blade Centripetal load)-W_ ArialArialArialTimes New RomanTimes New RomanTimes New RomanTimes New RomanSymbol    O#4!*dW Nigel Field Nigel Field  Ό Doc Info AuthorDoc Info Creation DateDoc Info Editing TimeDoc Info Last Revision DateDoc Info Last RevisorDoc Info ObjectDoc Info PropertyDoc Info Revisions CountFM3FM3 PropertyWK3WK3 Property  0( #     + : H V^ d  t  CMHdr0(