The hover performance of the UH-1H Iroquois has been estimated under a variety of operational conditions using POLAR2, a program based on blade element theory. This program is an improved version of POLAR, a program previously developed at ARL, which did not allow for compressibility effects. The occurrence of these effects in a hovering situation is discussed, and a relationship allowing for such effects has been derived and included in POLAR2. Other improvements, designed to make the program more convenient ot use include the calculation of tail rotor performance together with variables such as tip loss, air density and Lock number which were previously input. The role of the induced velocity factor is also discussed. Finally, comparisons of estimates using POLAR2 and ARDU flight trials data for the UH-1H are presented.


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    Title :

    Helicopter Hover Performance Estimation Comparison with UH-IH Iroquois Flight Data


    Contributors:

    Publication date :

    1986


    Size :

    38 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English