Accession Number:

AD0294626

Title:

Final Report,

Descriptive Note:

Corporate Author:

EASTERN RESEARCH GROUP NEW YORK

Personal Author(s):

Report Date:

1962-07-01

Pagination or Media Count:

1.0

Abstract:

Preliminary performance studies are given of ducted and conventional ir propellers on hydro ki mer cr ft. The study includes the eff ct of off-design op ration on th choic of prop ller xces hrus for acceleration and op r ion over a rough sea are xample of off-design. Si ce the maintenance of low propell r nois is i portan , results are pres nted in terms of the res ltant blade tip speed as well as propell r rpm. n analysis i de of ducted and conventional air propellers for two hydroskimmers one ia a 20 ton 70 knot craft, the other is a projected 125 kno craft. For both craft he ducted propeller ill have an appreciably smaller iameter than the conv tio al propeller. The ability to produce excess thrust in off-design is good for both types of propeller . It is shown that the drag increase due to operation over a rough sea can s arply reduce the attainable speed Propeller p rameters governing this condition are shown. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE