US2474667A

US2474667A - Speedboat hull

Info

Publication number: US2474667A
Application number: US602525A
Authority: US
Inventors: Robert L Harvey
Original assignee: Individual
Current assignee: Individual
Priority date: 1945-06-30
Filing date: 1945-06-30
Publication date: 1949-06-28
Anticipated expiration: 1966-06-28

Description

June 28, 1949. R. 1.. HARVEY SPEEDBOAT HULL 2 Sheets-Sheet 1 Filed June 30, 1945 INVENTOR.

June 28, 1949.

Filed June 50, 1945 R. L- HARVEY SPEEDBOAT HULL 2 Sheefis-Sheet 2 INVENTOR.

' fake! a: fi lfy BY waned 1 Patented June 28, 1949 1 JUN 'sPEEDBoATfiULL .ai Robert L. ,Har;yey,i;1ietrpit, Mich. Application June 30, 1945, Serial No. 602 525 4 Qlaims. (Cl, 1 14 66.5)

This inventionrelates to improvements'inthe design of speed boathulls. An object is toprovide an improved: design of speed boat hull'which-will enable itheihull to be driven over the water at a majimumrrate of speed with a minimum amount of power.

Another object is to provide a speed .boat hull so designed that the hull willtravel at a;,h1gh

rate of speed over the water withoutjumping or bouncing and will maintain-a.substantiallyeven straight line of travel.

Another obect is to provide a speed .boathull of the character heretofore described, so constructed that the hull will-follow adetermmed course without deviation therefrom.- The boat will rapidly and gradually attain a maximum. rate of speed rising gradually in the water as it does so and will then travelon an even keel over and through the water.

The hull is so constructed that it does not push up a mass of water ahead of the bow but so di-H:

Figure 1 is a side elevation of-a boathull embodying my invention.

Figure 2 is a plan ofthe bottomof the hull. Figure 3 is a frontelevationlooking toward the bow.

Figure 4 is a vertical sectional-view taken on the line 4-4 of Figure 1.

Figure 5 is a vertical sectional view. taken on the line 5--5 of Figure 1.

Figure 6 is avertical sectional view taken on the line 6-6 of Figure 1'.

Figure 7 is a vertical sectional view taken on the line 1--7 of Figure 1.

Figure 8 is a vertical sectional viewataken on the line 88 of Figur'l.

Figure 9 is avertical the line 99 of Figure'l.

1 Figure 10 isaverticalsectional view taken on the line III-l0 of Figure 1.

Figure 11 is afragmentary perspective, partially in section illustrating the manner in which the step fades out as it approaches the, keel.

The improved speed. boat hull design of ,my

Uinvention is. intended to. enable the hull to .at-

tain a high-speed with the same amount of power that other conventional hulls having the same general hull dimensions. .My improved ,;de sign .willgalso enab1e.. a,,h.u11 .to. travelat aihighi Speed at an even keel without jumpin as it travels over the water. As embodied in a hull design of a model speed boat size this improved hull at- 60 .com le entaryrom n ics '4: .s t Sides Q halmel. fin a sectional view taken on .tained-a. speed. several niles an. hour. fasten than other: .conventionahspeed, boat .hulls of thesame dimensions and. utilizing the samev size of .motor and wheel.

,Throughout thewdrawings the hull.i11ustrated is shown as providedhwith a keelfin 2l1rwhich extends fro'mthebow to thestern and: which has a depth from a point adjacent to the vertical line ofmtheiforwaiidupoint,ofi the bow to the step as v shown in I'li urellgreatenthan at anyiother point drearwardly oi. thes ep The k elfin 2.1L extends fr0m its forward point to the stepina-substan- .tially horizon alnlane. iliromthe step, wh re i i substantially onal n lwi h h t p 2 bit rad ly, sl p -upwar lymtoward the. stern and to a po nt n e tmediatethes .paand the ster flr ...J.h p n it; extends aft. to the, stemsubstam ti l onastrai htl r'l e ,hul .i rrovided at heiboww the pa r f d s ed i opp XtQnQi dQ s co qavit war y a t owardthes su 1- H exte u iverdl a e lly each s e. a avir m -thek e finandterm n te ins abili ensur a es 28 w h urfac s ermiue e imm d a lyadiesent to thestep in; substantially flat horizontal plane surh e s assho iniff eu lrzua d Jrheses p fi f su faces i Ra Mm. 11? @1. biifi width of the .qongavities 26.'- The ;concavities ,merge gradually into he keel and thecurye'also is gradual v outwardly, and downwardly until ,it

merges n liti' i ta er surfee pqr io h i u lm trhe'h illeu prines rarconsistsof a pair of tsemplsmien r substa t a m-surfa es 3. in

' thefigures of the drawing. jl hese surtaces also e ra u l y-i flam eel. n n an -ta er in Wi e re ed filf hes n towa the stern. The bottom. surface q i pposite, sides 40 Q he eelan ediw ntih reto n whi i u es he s e o the k el s m r es-i he b t m o ithahu isis bs an ia rflush as it passes, over the; step so ,-,that the concavities {extend u h bv r, t est p atev t m ed a 4fis iee nt tam -.kee fin ssho The bott m surfaces of the h lll,upQn..Opposite ,sides of.the

tk tb w n the. downwar y d qutw rd toward such stabiliz r (su a e H flShQW IiI F retfiiorm n t eistep. o emtq d t th r i no t mm d a ijacent to th keel becausedthebottoms ofuthe iconcavities adia-centtorthe keel; extend flush with g the surfaces 30.10.1117, the step beginsrand increases gradually in .rdepth-as shown by the downward cu rvature. of, the dines 2 6. in, Figure 6, and reaches 1 itsmaximumdrop inthe surfaces 28.

.The ,width ofnthe.ihullat they step is greater ab 1i e .:.surfa es, 28. ,extend as it appears in Figure 2 than the width of the hull aft of the step. The stabilizer plane surfaces are shown in Figure 2 as projecting outby the dotted line BB. As maximum speed is attained the keel divides the water at the bow and relative to the hull the water passes outwardly and rearwardly through the concavities 2B and the hull travels evenly over this water spray on a substantially even keel rather than bouncing or jumping from one wave to the next. Notwithstanding the rise of the boat as it attains speed relative to the water the keel fin is submerged substantially throughout the length of the boat so that the hull follows a determined I course without danger of variation therefrom.

What I claim is:

1. A boat hull having a keel fin extending longitudinally substantially from the bow to the stern and having a step disposed nearer to the bow than to the stern, said bow having complementary concavities on opposite sides of the keel and extending aft from substantially the bow to the step and increasing in width from the bow to the step and terminating laterally in chines dropped vertically below the bottoms of the concavities intermediate the keel and the chines, and terminating laterally adjacent to the step in complementary substantially horizontal stabilizer planes spaced on opposite sides from the keel fin by the width of the concavities and dropped below the bottoms of the concavities intermediate the keel and said planes, the bottom of the hull abaft the step and on opposite sides of the keel fin consisting of two complementary substantially horizontal plane surfaces said complementary plane surfaces merging substantially fiush with the bottoms of the concavities adjacent to the keel on a line with the step, said keel fin having a depth forwardly of the step greater than its depth aft of the step.

2. A boat hull having a step disposed in closer relationship to the bow than to the stern and having a keel fin extending longitudinally substantially from the bow to the stern, said hull having complementary concavities on opposite sides of the keel fin and extending aft from substantially the bow to a point substantially in line with the step and terminating laterally at the chines along lines spaced below the bottoms of the concavities intermediate the chines and the keel, said concavities terminating laterally adjacent to the step in complementary substantially horizontal stabilizer planes spaced on opposite sides from the keel fin by the width of the concavities and spaced vertically below the bottoms of the concavities and above the bottom of the keel, the bottom of the hull abaft the step and on opposite sides of the keel fin consisting of two complementary substantially horizontal plane surfaces, said keel fin having a depth forwardly of the step greater than its depth aft of the step and sloping upwardly as it extends aft from the step to a point spaced intermediate the step and the stern from which point it extends aft to the stern in a substantially horizontal plane.

3. A boat hull having a keel fin extending longitudinally substantially from the bow to the stern and having a step disposed nearer to the bow than to the stern, said hull shaped providing complementary concavities on opposite sides of the keel fin extending from the bow gradually downwardly aft therefrom and terminating aft substantially at the step, said concavities terminating laterally from adjacent to the bow to adjacent to the step in complementary chines dropped below the bottoms of the concavities intermediate the keel and the chines and terminating at the step and immediately forwardly thereof in substantially horizontal stabilizer plane surfaces spaced on'opposite sides from the keel fin by the width of the-concavities and providing a hull having a breadth at the step stepped laterally beyond the breadth of the hull aft of the step, the bottom of the hull aft of the step and on opposite sides of the keel fin consisting of two complementary substantially horizontal plane surfaces merging gradually into the keel and merging :dush with the bottoms of the concavities on opposite sides of and adjacent to the keel, said keel fin having a depth -from a point substantially adjacent to the forward point of the bow and aft to the step greater than the downward projection of the two stabilizer planes and greater than the depth of the keel aft from the step.

4. A boat having a hull provided with a step disposed nearer to the bow than to the stern and provided with a keel extending from the bow to the stern, said keel having a depth from a point adjacent to the stern and extending to the step greater than the depth of the keel aft 0:" the step, the bottom of the hull aft of the step consisting of two complementary substantially horizontal plane surfaces disposed on opposite sides of the keel, the bottom of the hull forward of the step provided with two complementary concavities disposed on opposite sides of the keel extending substantially from the stem to the step and terminating laterally in chines extending substantially from the stem to the step, said chines dropped to a point below the bottoms of the concavities intermediate the chines and the keel and above the bottom of the keel, said concavities terminating laterally adjacent to the step in complementary horizontal flat stabilizer plane surfaces spaced above the bottom of the keel and below the bottoms of the concavities, said hull having a breadth immediately forwardly of the step and at the step and over said stabilizer plane surfaces stepped outwardly laterally beyond the breadth of the hull aft of the step.

ROBERT L. HARVEY.

REFERENCES CITED The following references are of record in the file of this patent:

. UNITED STATES PATENTS Number Name Date 1,353,669 Scott Paine Sept. 21, 1920 1,826,229 Van Wienen Oct. 6, 1931 FOREIGN PATENTS Number Country Date 339,508 Great Britain Dec. 11, 1930