Purchase price analysis of over 120 helicopters using linear regression statistical analysis has yielded a price estimating equation. This equation shows helicopter prices are more sensitive to installed power than to weight empty. A similar analysis of 165 propeller driven airliners has yielded a contrasting price estimating equation. This equation shows airliner prices are much more sensitive to weight empty than to installed power. Comparison between the Boeing Model 234LR helicopter and the de Havilland Dash 8-300A turboprop shows the sensitivity of price to weight empty is about dollar 300 per pound. However, helicopter price sensitivity to power is at least 40 percent greater than that of the comparable airliner. No reason for this excessive price of power within the rotorcraft industry is apparent from this analysis. The traditional minimum weight empty design approach results in excessive installed power due to high disc loading. The design approach has been necessary to meet military requirements such as fitting helicopters inside an Air Force C-130 and operating tiltrotors from a Navy ship. This military oriented design approach is wrong for commercial products. The price estimating relationship developed shows that designing for minimum weight empty does not equate to minimum helicopter purchase price for the commercial operator. Continuing a military oriented design approach for advanced commercial products such as civil tiltrotors is not recommended. (continued vol. 3 pp 121-132)


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    Title :

    Helicopters cost too much


    Additional title:

    Hubschrauber kosten zuviel


    Contributors:
    Harris, F.D. (author) / Scully, M.P. (author)

    Published in:

    Publication date :

    1997


    Size :

    34 Seiten, 11 Bilder, 22 Quellen


    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    Helicopters Cost Too Much

    Harris, F. / Scully, M. / American Helicopter Society | British Library Conference Proceedings | 1997


    Supplemental appendix - helicopters cost too much

    Harris, F.D. / Scully, M.P. | Tema Archive | 1997



    Supplemental Appendix - Helicopters Cost Too Much

    Harris, F. D. / Scully, M. P. / American Helicopter Society | British Library Conference Proceedings | 1997


    Helicopters and aeroplane-helicopters

    Lame´ / M. | Engineering Index Backfile | 1921