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Uploaded byAhmed Taha
Propeller Drawing (Holst Method)
This document provides instructions for drawing a propeller using the Holst method. It includes diagrams showing: - The radii of 9 sections of the propeller blades as a percentage of the total radius R. - Diagrams labeling elements of the propeller including the generator line, directrix, tip and root thickness, rake, and leading and trailing edges. - A side view showing the expanded blade outline and transverse view. - Labels for elements in a developed blade outline including the line of maximum thickness and projected outlines.
Propeller Drawing (Holst Method)
- 1. HOW TO DRAWPROPELLER Holst Method ?? REPRESENTED BY : Ahmed Taha
- 2. r1 =0.2 R r2=0.3 R r3 =0.4 R r4 =0.5 R r5 =0.6 R r6 =0.7 R r7 =0.8 R r8 =0.9 R r9 = R 3.000 o I G1 c1 E1 F1 E’1 E’’1 F’’1 F’1 P/ 2pi D1 B1 D’’ B’’ Direction Of Rotation G3 c3 E3 E’’3 E’3 F’’3 F’3 B3 D3 B3’’ D3’’ G5 c5 E5 F1 E’5 E’’5 F’’5 B5’’ Developed Outline Projected Outline Transverse ViewExpanded blade C - FC – E line of max. thickness Expanded blade outline Side elevation 15 ̊ Root thickness Directrix Tip thickness Generator line F – F’E – E’ B–B’ D–D’ Longitudinal projected line Rake CE CF PMT to LE
- 3. Back – TrailingEdge Back – leading Edge Face – leading EdgeFace – Trailing Edge PMT 100 % 80 % 60 % 40 % 20 % 20 % 40 % 60 % 80 % 90 % 95 % 100 %
- 4.