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Analysis and modification of theory for impact of seaplanes on waterAn analysis of available theory on seaplane impact and a proposed modification thereto are presented. In previous methods the overall momentum of the float and virtual mass has been assumed to remain constant during the impact but the present analysis shows that this assumption is rigorously correct only when the resultant velocity of the float is normal to the keel. The proposed modification chiefly involves consideration of the fact that forward velocity of the seaplane float causes momentum to be passed into the hydrodynamic downwash (an action that is the entire consideration in the case of the planing float) and consideration of the fact that, for an impact with trim, the rate of penetration is determined not only by the velocity component normal to the keel but also by the velocity component parallel to the keel, which tends to reduce the penetration. Experimental data for planing, oblique impact, and vertical drop are used to show that the accuracy of the proposed theory is good.
Document ID
19930091899
Acquisition Source
Legacy CDMS
Document Type
Other
Authors
Mayo, Wilbur L
Date Acquired
September 6, 2013
Publication Date
January 1, 1945
Report/Patent Number
NACA-TR-810
Accession Number
93R21189
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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