Experiments with planing surfaces Page: 3 of 34
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NATIOAAVIOY OMTE O A R TOS
wW So t. to
Experiments with planing surfaces are fundamental hy
r&namic researchies for the prpose of' obtaiin~ the
most favorablefor'ms f'or planing boats, flyin boats, and
seaplane floats, with respect to water resistance and sea-
~' Y
I:1TESTS OF MODELS O1f PLANtINTGANTD FLYING~ BOATS
AND THEIR ANAtYSIS
Figure 1).Ahows typical water-resistance curves for a
Iplning boat and a ying boat
The planingUboat has &resistance curve which, be-
'catuse of' the. constant weight of' thte boat, shows~ a continu-~
ally increasing resisptance with inc easing s The re-
sisetan~ce increases approximately quladratically utp to the
instant of' the-beginning df' planning, and~ in the plaing
co itior incases with a power les nthan 2.
The flyii boat is lightened by the wing lift wicoh
increase as the square of' the speed. The resistane
curve :thetefore first reaches a matimum value andte
falls.aoe to rec ero a the istnt of' akeoffan th t
s, he .e wng lift equal h ros we
in b aa takeoff with any loa fo whhheumo
n pT cMDE INMAD:VvIGI3,
th war an air resi.a wr-istances reaiues rtavtes poro
., a ia .'oat an .fli ng a t
p ole thust.L '
* tEetet o m p ey redbefor thy ri ni2
me t ot d n
199t Fro auhr s rerignet of article i ert Rede
ei-Hafif," on7,1929,p r.45 2 S .
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Sottorf, W. Experiments with planing surfaces, report, March 1932; (https://digital.library.unt.edu/ark:/67531/metadc63597/m1/3/: accessed March 19, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.