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Constant chord blades with linear twist
Most modern blades feature a degree of negative twist, decreasing the pitch angle towards the tip, as means of optimizing the blade loading distribution. This can be expressed using the following equation:
r
0(r) = 0O = r
|
ST =1 pabc |
 |
where 60 is the collective pitch applied at the hub; 91 is the total twist (normally negative) and rIR factors the total twist according to radial position. Now:
T = 2 pabcVJ R (I +1 -*
