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Патент USA US2403754

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' July- 9, 1946-
J. D. PliERsOiN
‘Filed Feb. '9, '1944
July 9, 1945'
4 .
Filed Feb. 9, 1944
2 Sheets-Sheet 2 '
R' Ev
Patented July 9, 1946
John’D. Pierson, Ov'erlea, Md., assignor to The
Glenn -L. Martin Company, Middle River, Md,
a corporation of Maryland
Application February 9, 1944. Serial No. 521,608, 7
5 Claims.
(Cl. 244v—135~)
This invention relates to a method and means
for increasing the range of a seaplane and assist
' The seaplane illustrated in Figures 1, 2 and 3
is shown having a hull generally indicated as "l
ing the take-off under heavy loads by means of
to which the subject sponsons 2 are-attached. It
will be noted that in this application of the in
vention, the sponsons are so formed that they
extend forward and aft of the wing and, in the
droppable sponsons mounted exteriorly ' of the
hull, along the chine that increase the fuelstorage
capacity and afford greater planing area. ' N Y"
"The inherent structure and design of any air
particular application, form substantially acon
tinuation of the bottomsurface ofthe hull for
. craft necessarily determines take-off characterise
tics, and the fuel carrying capacity designed for
ward and aft of the ?rst step.
the craft, determines maximum range. Aircraft “10
, designers are continually on the lookout forjany
device or expedients which may be employed in
connection with a ?nished design, to improve
complete sponson by having their ends contiguous.
,'I‘hese"sections are separately attached and de
tachable from the hull along the chine and the
bottoms of these sections form a smooth con
either performance, take-off or range that do not
amount to a major change in'str'ucture or which
do not inhibit existing desirable performance
characteristics of the airplane. V
‘ ‘w
tinuation of the hull bottom, thereby increasing
the planing area of the. hull adjacent ‘the step.
-The take-off characteristics of seaplanes, are
usually quite critical and overloading the plane,
Figures 4 and 5 showenlarged views of the spon
Vsons. Each section of the sponson is secured to
20 the hull by a ?tting 6 which has a pin '1. retract
~ able into a‘cylinder 8, by means of ?uid pressure.
This] pin extends. through eyelets 9 in bracket 6
which is attached to the hull, and an eyelet in
member ID, attached to the tank. a The fluid cyl
26 inders are all connected together by line ll, com
such as increased fuel loads, to extend the range
of the craft would bring about undesirable
‘ changes in the hydrodynamic characteristics of
the craft at take-o?".
By this invention a means is providedwhereby
the range of a seaplane can be extended without
sacri?ce of any of the desirable performance
Figures 3, 4 and 5 show the droppable sponsons
in sections. Sections 3', ,4 and 5 go to make up a
municating with a source of ?uid pressure, which
maybe either a part of the hydraulic system of
the craft, or in the preferred form, an air bottle
A [further object of the invention‘is‘the pro
vision of structure to increase the range which I may be employed to quickly and simultaneously
also improves the take-off characteristics of the 30 withdraw the pins 'so the'sponson. sections may
be .droppedwall together.
Another object of the/inventionjs the" provision
Figures ‘7. and 8 show enlarged vviews of the
of means for storing additional fuel exteriorly
details of the bracket and pin forattachingand
of the aircraft which does not interfere with'pere , detaching, the sponson from the hull desired
formance characteristics and further ,may be 35 above_., A pad l2 is provided between the sponsons
jettisoned to increase the range of the craft when i
and thehull to prevent abrasive action between
no longer needed.
the sponson and the hull.
Further and other objects will become ‘apparent
from the description of the accompanying draw
ings which form a part of this disclosure and in
which like numerals refer .to like parts.
Inthe drawings:
Figures 9 and 10 are enlarged views showing
the attaching. bracket for. supporting the bottom
of the sponson on the bottom of the hull, at the
chine strip I 3. Abracket I4 is riveted on the
chine having a tapered projection l 5. To a spon
son'3. aplate-IG is riveted having a hole I‘!
Figure 1 shows a plan view .ofjthe invention
adapted'to extend and fit over projections l5.
Figure 2 isla front viewlof thei'seaplane'incor 45 A pad 18‘ is placed betweenthe sponson and the
porating the ‘invention.
chine strip toprotect each from abrasion by the
applied to a seaplane,
Figure 3 is a side'iview'of the seaplane?showing ',
the location‘ of the invention.’ '
. .,
[Figure 4157a.‘ fragmentary view of the sidecrofl
a seaplane hull showing the droppable sponson.
Figure 5 is a fragmentary [view in principle of
the- structure shown in Figure 4.
Figure dis a fragmentary section through’ the
hull and sponson. '
Figures 7 and 8show the attachment of the top
of the sponson to the hull. \
Figures 9 and 10 ShOW the attachment or the
bottom of the vsponson to the hull.
Figure 1.1 is a fragmentary view in section
showing the detachable fuel line.
. other.
@ Thegasoline line 20 to withdraw gasoline from
I .
the sponsons, isshown in Figures 6 and 11.. The
latter ?gureshows an enlarged detail of the gaso
line line ‘and ?tting connection between the spon
son and the hull, with provision for a quick
detachment of the line, when the sponson falls
away from the side ‘of. the ship upon the with
drawal of the pins. 'A bracket l9
. shown
secured to the hull. Pipe 20 is connected to this
bracket and to the fuel pumps; Pipe 2i extends
through the wall 22 of the sponson and is secured
, theretoby a weld or other means as indicated'at '
60 23.
This pipe extends through a hole in the
wall of the hull and into bracket IS. A sealing
means is provided in the form of O-ring 24, of
elastic resilient‘ material, placed in a groove. 25
to effect a ?uidtights'eal. It can readily'be seen
from an inspection of Figures 6 and 11, that when
pins 1 are withdrawn from eyelets 9 and lo the;
aerodynamic forces and the force of gravity will
urge the tanks outwardly, withdrawing‘ the'pipe
2| from bracket l9 and downwardly to'diseng-age
plate l6 from projection l5, thus freeing‘, the
sponson from the attachment to the hull.
by a substantially unitary spcnson is formed,
said sections being separately removable for serv
iceYi-and“ repair; meanstoidetachably secure said
sponsons to said hull, whereby said sponsons may
be dropped after performing their dual function
' of increasing the planing area and affording stor
age space for auxiliary fuel.
2. In combination with a stepped seaplane hull,
sponsons, adaptedgto carry auxiliary fuel com
prising tanks extending along the chine on each
side of’ thehull forward and aft of the step, the
bottom of the sponsons forming substantially a
It has been found that ona- ?ying, boat, similar
continuation of the bottom of the hull, said spon
to that illustrated, the addition of such sponsons
sonst comprising a plurality of separate tanks
increases the range about 60% by providing ad
ditional fuel storage space. The increased plan 15 placed with their ends contiguous along the chine
whereby a- substantially unitary sponson- is
ing area adjacent the'stepcompensatesfor'the
a detachable: telescopic, sealed ?tting
additional‘ load of. gasoline» on take-off so that
connecting the gasoline line with theinterior of
the take-off characteristics are-about. the same as
each of said tanks, said sections being separately
without the sponsons and additional. load. In
other words, at take-off the sponsons carrying 20 removable for service and repair, means for de
tachably securing. said sponsons to said hull,
the gasoline by their form, compensate for the
whereby said sponsons may- be dropped after per
additional load causedv by the gasoline. The fuel
forming their dual, function of increasing the
will be ?rst drawn from the auxiliary tanks inthe
planing area andtaffording storage space for aux
sponsons and during ?ight. The-sponsons affect
the aerodynamic characteristics of the airplane 25
3. In combination with a stepped seaplane hull,
so that about 2% reduction in top speed results.
sponsons adapted to carry auxiliary fuel com
Theeffect. onv cruising speed is less so that it is
prising tanks extending along. the chine on each
practically inconsiderable. When the gasoline
side, of the hullforward and aft. of the step, the
has been. used from all the sponson. tanks, by
means» of ?uid pressure connected to lines H, all 30 bottomv of the. sponsons forming substantially a
continuation of the hull, means to detachably
the sponson tanks may be dropped simultaneously
andth'e plane continue onits trip. with topper
formance having. the advantage of normal take‘
secure said sponsons on. said hull, whereby- said
off and a 60% increase in-its range.
Itv should be, noted, that the sponsons may be
sponsonsrmay be dropped after performing their
dual function of increasing theplaningarea and
affording. storage space for auxiliary fuel, a readi
made relatively inexpensively compared withthe
very desirable result obtained and the adaptation
of the ship for the connection of droppable tanks
line line with the delivery line from said tanks,
and means to simultaneously detach alL tanks
ly_ detachable sealing means connecting a gaso
from said hull.
of the. character described does, not affect the
4. In combination. with asteppedseaplane hull,
landing. and take-01f of the ship’in normalopera 40.
' sponsons adapted to carry auxiliarygfuel. com
tions without such tanks.
prising tanks extending along the chine on each
The number. of tanks is, of course, optional.
side of, the- hull.‘ forward and aft of. the step, the
In- the, preferred embodiment herein, described,
bottomof the sponsons forming. substantially a
the sponsons are shown- in three sections forfcon
venience' of handling and attachment. Since. all, 45 continuation of the bottom of the hull, saidspon
sons comprising a plurality of sponsors tanks
seaplanes must have beaching gears, of. some sort,
placed along the chine with their ends contiguous
in the preferred form of the invention, a forward
whereby a unitary sponson is formed, readily de
section of the sponson is shown of a longitudinal
tach'able means securing. the bottom edge'of the
extent. sumcient to span the area on the hull
where the beaching gear would. normally be at
50 tank to said chine, means. to detachably secure
tached. The beachi'ng, gear location. is shown in
dotted lines in Figure 3'. The portions of the
sponson, except for this section, can be installed
while the seaplane is on shoreon the beaching
the top of,‘ said sponson tanksto said hull, said
be, attached after the beaching gear. has been re.
moved when the seaplane is a?oat. Due to the
storage space for auxiliary fuel.
last mentioned means being interconnected for
simultaneous operation whereby said sponsons
may be dropped after performing their, dual func
gear, and theforwardportion of the sponson can 55 tion of increasing the planing area andaffording
difficulty of handling seaplanes in‘ rough water,
the advantages‘ of attaching the major portions
5. In combination with a seaplane hull, spon
sons adapted to carry auxiliary fuel comprising
tanks extending along the chine oneach side of
of such sponsons on shore and ?lling them with 60 the hull, the bottom of the sponsons formingsub
stantially a continuation of‘ the bottom of the
gasoline on shore, should be obvious.
hull, said sponsonsw comprising. a plurality of
It is to be understood that certain changes,
sponson‘ tanks placed along“ the chine with their
alterations, modi?cations and substitutions can
ends contiguous whereby a unitary sponson is
be' made without departing from the spirit and
scope of the appended claims.
65 formed, readily detachable means securing the
bottom edge of the tank to said} chine, means to
I claim as my invention:
detachably secure the top of‘ said sponson tanks
1. In combination with a stepped seaplane hull,
to said hull, said last mentioned means‘ being
sponsons adapted to carry auxiliary fuel compris
interconnected for simultaneous operation where
ing' tanks extending‘ along the chine on each side
of the hull forward and aft of the step, the bot 70 by said sponsons may be dropped after perform
ing' theirv dual function or increasing the planing
tom‘ of the sponsons forming substantially a con
tinuation of theb'ottom of the hull, said sponsons
area and affording storage space for auxiliary
comprising’ a plurality of separate tanks placed
along the chine with their ends contiguous, where
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