"' "' I
~
o::;
;::::>
§§
.......__,_
(fJ
ro
:z;
E-t
P-o
~
;::::>
(!)
f:il ......._
o-'
"'"'
o::;
:::;>
~ '
FUEL CONSUMPT·ION ·
· AND R . P. M. VS . AIR SPEED
FOR K-3 THRO K~S SHIPS
EQUIPPED WITH WRIGHT R975-28 ENGINES
Fig. XXIII
~~
·:{~~,-vv
~~() .
.
3oo 1----:.. _so_ - _______________ _
(;() ~1-:z; ~}: p
...:1 ~ · H ~ ·
~ 40 ~ ·
~"'0s
.n'l>.\)
~'' ~ . ~e>
~Q~
-a~"
- ~~"\
<P~<o
PART LEAN
-,
2~00
2000 '
-- -·1 800
I .
~~ .
P-o .
0::
120 0
100 ' 1000
30 •10 50 60
AIR 0PEED - KNOTS
I ~ 0
Fuel
Consumption
go
4ool
~
6ol~
C)
Po
Ul
" ::rl 300 ·50 c::
" J4 0
~ ,.-i
£'e .... as . 0
Ul
.0 4o ..3
4o
Average Fuel Consumption and R.P.M.
- VS - Air Speed (K-57 & Future) .
Equipped with Pratt and ~hitney
R- 1340 - AN - 2 Engines
12-1/2 Ft.Prope11ers - set at 190
NA - Y9E1 - 510 Stromberg Carbur .etors
Fig~XXIV
45 50 55
TRUE AIR SPIED - KNOTS
6o
f·
- ~
-- -~ -- r- -- . --- i ----r--I .. -
I -I - '- Ml-
- ! . ·['·-· ... '---. p: .. ; __
I . - . • . •-- -
-· ]. .. ..... . ... __ L .. i--·-: -·
! j' ! I I ·-·' j2000
i !___ . __ _j ___ 1, .... 1 ...
I ' I
I --~ 1900 I ! ,
' I I I
- -r -·-r -· -··· ·• ..
-- :-··t-·-
. · ! . ~ - t. 11goo I ' • I I
l 1 I .
.. I' : ....... 1 ..... --·~·--· ~-+-·-1
I f - ... -! -- --- . 1700 I I I l ; I ' I . I . I
1·· · 1 - · · · ! · ---r · ;··· 1 .. · ·
.J I-. ···t· 11600
I I . i ! I I
I 1. I ! I
. r ·--1 - -· ··; · i ·· ., ... ·--
t:}fl- . -- i :1500
i . ! . "f ··-! ---1--+·- !-----1-~-...
• .1. :. ' 1400
I ' I I I I ' l I I
.. + ·- i. l--- .~.. -· --1 . --·-+ ....
. • i I ' I
i : i I ! I 1300 . , . . I
I ! I I I
J ... L ..... : .... -. --- t ... I ____ L __ 1
I I I I 1 1~00
I I I I I f 1
I .. , .... 1 ..... , ........... ··-·· .... .
I i I I I !
. ! I. l I 1100
I I I I
1----L.. ..J. '··-· I
i I i
ldoo.
I : i I I I
I - ~5 ·{· ·r· . --: -7f .... :
.......
I I_ • _,
l I . i I I .
l -- --+---+--·--r·-~----T·· -,
I l i i l I
L __ L_.t ___ l _ l. J
HEAD WIND VELOCITY,
KNOTS
MOST ECONOliTCAL AIR SPEED, KNOTS
K-3 thru K-8 K-9 and Future
10 46.0 42.0
15 46.0 42.0
20 46.0 42.0
25 46.0 43.5
30 49.0 50.0
35 51.5 56.5
40 56.0 62.·5
45 58.0 64.0
50 58.0 64.0
Fig. XXV
Economical Air Speeds
-67-
B. FUEL SYSTEM
The fuel system of the K-airsh1p is designed to make
·possible the shifting of fuel for the purpose of trimming
the ship without interference with the normal fe ed of the
engine. This is accomplished by carrying the bulk of the
fuel in two banks of storage tanks, a forward and an aft
bank, and by feeding the engines from two service tanks
which can be isolated from the rest of the system. The
service tanks can be filled from either bank of storage
tanks without interruption to the feed of the engines.
The system can be filled through an outside connection
or through an inside connection by means of the transfer
pump.
Provisions are made for dumping fuel from aft storage
tanks and for the release of two slip tanks located under
the floor of the cabin, for the transfer of fuel from the
slip tanks to the rest of the system and for the proper
filtering of the fuel.
CAUTION: 1. !t take-off, always open valve in cross-connect
ing fuel line to insure against a fuel pump
failure.
2. Make certain that there is ample fuel in the
service tanks at all times during flight.
3. Do not dump fuel wh-en either of the auxiliary
engines is running.
-69-
0'
())
. Oil
Operating Engine Mixture Carburetor Oil Inlet Cyl. Head Pressure REMARKS
Condition R.P.M. Control Air Temp. Temp. Temp. lbs./in2
Start Set FULL fULL Must Show In cold weather heat oil in out-
Throttle RICH COLD in 30 Sec. rigger tanks by means of elect-
for 600 rical units.
R.P.M.
Warm Up 500-600 FULL FULL
For 1 Min. RICH HOT 50 Do not exceed 1400 r.~.m. for
1000 After Minimum continual operation.
(2)
Ground 1400 FULL 32°C. 37.8°C. 204°C. 70-90 Drop in R.P.M. when shifting
Test RICH Minimum from one magneto to the other
should not exceed 40.
Take-orr 1800 FULL 32°C. 60-64°C. 233°C. 70-90 Max. rating 600 H.P. at 2250
Max. RICH R.P.M.
Cruising 1300 PART 32°C. 6o-64°c. 204°C. 70-90 Do not lean carburetor beyond
Desired LEAN or Less 10 R.P.M. drop of speed.
Desired
" Stopping 400-500 FULL Idle engine until ~ylinder
LEAN tem~erature has dropped below
220 C. before atopping.
. 0
1. With propeller setting of 23 at 42" radius do not fly •hip faster than 67 knots.
2. Do not operate engines at speeds causing bad vibrations. Maximum vibrations occur between 650 to 900 r.p.m.
Fig.XXVI Mechanic's Check Chart
Pratt and Whitney Rl340 - AN2 Wasp Engine
4· Clean the four fuel strainers after every
120 hours flying time, and oftener, if
necessary. The strainers should be cleaned
immediately when irregular operation of either
engine develops.
For the location of the strainers and
instructions .for cleaning them in flight,
see Fig. XXVII on the following page.
5. Make certain that pressure in fuel system does
not exceed 25 lbs. per sq.in. when filling
from external pump.
6. Do not feed engines from a tank containing
less than 12 gallons of fuel as the outlet
is nearly uncovered with this amount of fuel
still in the tapk, and with the ship at a
30° angle of pitch.
The various operations which can be performed with
the system, together with the proper settings of the valves,
are described in Figures XXVIII-a thru XXVIII-j for K-3
thru K-10 airships, and in Figures XXIX-a thru XXIX-j for
K-11 and future.
C. RECOMMENDED CARBURETOR ADJUSTMENT
a Run engine at 400 RPM.
b Cylinder head temperature should be normal.
c Have good plugs in engine.
d Have mixture control FULL RICH.
e Note RPM.
f Rapidly move mixture control from FULL RICH to
IDLE CUT OFF positfon. Catch the engine
before it stalls.
(g) Note RPM.
1. If large gain in RPM - Carburetor is set too
rich.
2. If loss in RPM - Carburetor is set too lean.
3. Desired - gain of from 0 to 10 RPM.
The desired setting is the RICH BEST POWER setting
for the carburetor at the idle speed of the engine.
-70-
3-4-5 -6- 0NLY - TANK.5-I-2.-3 - 4 - 7 -8·9~1 0 - ARF
STORAGE TANK.5-IZS6AL. EACH-
··;; ------------=x---
/ '
' ' I -- I \
AND fUTURE ONLY
Fig. XXVII
FUEL SYSTEM
~--~
I c~
IN TRANSFER PUMP
CARBURETOR-POWER PLANT
-- - FILLER HOSE
~-- -
)\
\
'ER- TO INTAKE 11ANifOLD
SLIP TANK- 100 6AL., -::::oo.,_..........,.:
SLIP TANK-80 GAL-c-. ----------,------~-.......~
REMOVE AND CLEAN FUEL STRAINERS WITH
GASOLINE AND A BRUSH IN THE FOLLOWING SEQUENCE
(1) Open crossover valve. (2) Close valve _on fuel supply .line to one engine.
(3) Drain fuel from inoperative emergency pump. (4) Remove and clean strainer
from inoperative pump. (5) Replace strainer. (6) Reopen valve previously
closed on ~ngine supply line. (7) Repeat for other engine. (8) Close .crossover
valve. (9) Cl. ose valves to main transfer Fump. (10) Remove and clean strainer
immediat~y above ma:i,n transfer pump. (llJ Replace strainer. (12) CJ.os~, va~ves
on fuel line to Barrett coupling •.. (13) Remove and clean strainer above ceiling
of car in filler line. (14) Replace strainer. (15) Adjust fuel valves for normal operation.
' "" - -. ' \
' I
I I .1
I I
- /
; -;tJ.. I /
-- :-l. _,;,•· . (__- -- _-;_-/
I I
I \
-,-~.,? ~ ~I /
-.: .....
BARRETT COUPLING
· LIN£ STI<A!NER
EMERIJENCV PUMP STRAINER_.
-71-
FILLING.SYSTEM FROM OUTSIDE
CONNECTION
Fill each tank in •
succession according
to desired fuel load
and. fuel distrJ.bution.
Truck pump should be
equipped with relief
valve. Set for a max.
of 25 lbs. per sq. in.
If no relief valve is
available throttle down ~~=-~
the flow by means of
main valve.
K-.3 thru K-10
Fig. XXVIII-a
FILLING SYSTEM THROUGH INSIDE
CONNECTION
Use transfer pump and
Filler Hose
K-.3 thru K-10
Fig. XXVIII-b
-72-
TAKE-OFF
Feed engines from both
service tanks. Open
cross feeding valve.
K-3 thru K-10
FUEL PUMP FAILURES
Fig. XXVIII-c
[l;RANSF'ER PU"P
!'TH RE:W YALY£ ~
~~~~~15~/TION ""'
In case of failure of
one engine driven pump
open cross connecting
valve. In case of
failure of both pumps
set as indicated in
·diagrPm and us.e
emergency pump.
K-3 thru K-10
" "'·
Fig.XXVIII-d
-73-
lsr'e'o c~Re .
FU[C SY$T[M K
1K04Do!ATo: e-..
FILLING AFT SERVICE TANK FROM AFT
STORAGE TANKS WHILE FEEDING
ENGINES FROM FORWARD SERVICE TANKS
Ose transfer pump. Open
outlet valve of storage
tank . from which it is
desired to draw fuel.
K-3 thru K-10
Fig. XXVIII-e
'FILLING AFT SERVICE TANK FROM
FO.RWARD STORAGE TANKS WHILE. FEED
ING ENGINES FROM FORWARD SERVICE TANK. ~~~
[rRANSrER PUWP
friiTH R£Lit YALY£ ""
f'RE~E ST..Qf_ '-
lrOR~HrS fibSITION '-
Use tr~ nsfer pump* Open
outlet val v~ of storag e
tank from which it- 1.s
desired to draw fuel t o
£ill service tank.
K-3 thru K-10
" '\
Fig .. XXVlti-f
-74-
[I'"
12: BARRETT rii..LINCi
CONNECTION
I (S!RAlNERS I
ENCY ~
~------~A~sm~
rUEl SY~T£10 II
~To: o-...
[I'" .
. ·• 12:~ ro..LING
CONNECTION
[Si'RA lNERS I
FILLING FORYiARD SERVICE TANK FROM
AFT STORAGE TANKS ~EILE FEEDING
ENGINES FROM AFT SERVICE TANK
Use transfer pump. Open
outlet valve of storage
tank from which it is
desired to draw fuel to
fill service tank.
K-3 thru K-10
Fig. XXVIII-g
FILLING FORWARD SERVICE TANK FROM
FORWARD S'TORAGE TANKS WHILE FEEO
ING ENGINES FROM AFT SERVICE TANKS
Use transfer pump. Open
outlet valve of storage
tank from which it is
desired t~ d~aw fuel to
fill service tank.
K-3 thru K-10
Fig.XXVIII-h
-75-
iD4PGENCY Nil'
~------~A~~m~
(S!RA l NERS I
FILLING SYST~~ FROM
OUTSIDE
. CONNECTION I" STRAI~-
Fill each tank WITH RELIEF VALVE.
' ' '
EMERGENCY PUMP
& STRAINER UNIT.
STRAINER DRAIN .
If BAitRETT FILLING CONNECTION. TRANSFER PUMP ~
in success ion a c- n ~---'1~-..---'1---i:r----<
cording to de- .
sired fuel load .
and fuel distrib-
ution. Truck
pump should be
equipped with re
lief valve. Set
for a max. of 25
lbs. per sq. in.
If no relief is
available - throt
tle dovm the
flOW by means of ENGINE DRIVEN PUMP •WITH BY-PASS main ValVe. f!_&~Ri!El~IE£...F _jV~A~lV!'!E_iS. ____ -;~3
K-11 AND FUTURE
FILLING SYSTEM
THROUGH INSIDE
CONNECTION
Use transfer
pump and filler
hose.
K-11 AND FUTURE
POU CARB. - - ',,
Fig. XXIX-a
~reb ..
I" SJ!f.!~JL ... _
f'llL(llt
....... ~,"T'J'-- ........ ~~ ... l
ENGINE DRIVEN PUMP WITH BY-PASS & RELIEF VALVES.
PORT CARB.
Fig. XXIX-b
-77-
DRAIN.
EMERGENCY PUMP
6 STRAINER UN!.L
SCHEMATIC DIAGRAM-FUEL SYSTEM-"~"AIRSHIP
EMERGENCY PUMP
& STRAINER UNIT.
STRAINER DRAIN.
If BARRETT FILLING CONNECTION
\ STRAINER DRAIN.
EMERGENCY PUMP
. & STRAINER UNIL
SCHEMATIC DIAGRAM-FUEL SYSTEf'f~'AIRSHIP
TRANSFERRING FUEL FROM F0RWARD TO
AFT STORAGE- TANKS WHILE FEEDING
ENGINES FROM SERVICE TANKS
Open outlet valves of
tank from which it is
desired _to transfer
fuel. Use transfer
pump.
K-3 thru K-10
Fig. XXVIII-i
TRANSFERRING FUEL FROM AFT TO
FORWARD STORAGE TANKS WHILE
FEEDING ENGINES FROM SERVICE TANKS
[;RANSrER PUOIP
_!ITH R£.LIT yALV£ ""'
~ ~~WOt~IS
~ITION "'
Open outlet va~ves of
tanks from which it is
desired to transfer
fuel. Use trans£er
pump.
K-3 thru K-10
"" -"'·
F:tg. XXVIII-j
-76-
~-l!:>POR"'-'l· _C_ARo .
r7 "lj!BARRETT _ri!,LING
CONNECTION
fSTRA:NERS I
rurc ~·:.nw •
$04EMAT•:.: ~.AGAA...,
TRANSFERRING FUEL FROM FORWARD TO
AFT STORAGE TANKS WHILE FEEDING
ENGINES FROM SERVICE TANKS
~TRANSrER PU .. P
~!TH RE:L£T Y&-Yt ""'
~~ ~~\2fUT~ ITIO N "-..
Open outlet valves of
tank from which it is
desired _to transfer
fuel. Use transfer
pump.
K-3 thru K-10
" "'
Fig. XXVIII-i
TRANSFERRING FUEL FROM AF'I' TO
FORWARD STORAGE TANKS WHILE
FEEDING ENGINES FROM SERVICE TANKS
Open outlet va~ves of
tanks from which it is
desired to transfer
fuel. Use trans£er
pump.
K-3 thru K-10
F'rg. XXVIII-j
-76-
I fSTR A:NE RS I
TAKE-OFF
I'
TRANSFER PUMP
WITH RELIEF VALVE.
Feed engines from
both service tanks
Open cross feeding
valve.
ENGINE DRIVEN PUMP
WITH BY-PASS
& RELIEF VALVES.
POlT CARB. -- ,
K-11 AND FUTURE
Fig. XXIX-c
FUEL PUMP FAILURES
TRANSFER ·PUMP
WITH RELIEF VALVE
In case of failure
of one engine
driven pump open
cross connecting
valve. In case of fniTt_,...,
failure of both \: 1 ! 'L-.+--.1
EMERGENCY PUMP
& STRAINER UNIT
ST"-AINER DRAIN.
tf BARRETT
FilLING CONNECTION.
DRAIN.
EMERGENCY PUMP
. 6 STRAINER UNIT
S(HEMAT!C DIAGRAM-Fl,!L SYSTEM -·~·AIRSHIP
EMERGE'KY PUMP
6 STRAINER UNIT
STI\AINER DRAIN.
tf BARRETT
FILLING CONNECTION.
pumps set as indi- ~
c a ted in diagram ~-----+--......... _"
_ •• _._ ... _. ~H<J~~ ~D..--+---+----1
and use either ~
emergency pump. ~
r -- ~--.~
K-11 AND FUTURE
i : ,u:~ 'j
--~o-· 8 6
ENGINE DRIVEN PUMP
WITH BY-PASS
& RELIEF VALVES.
PORT CMB .
----'
Fig. XXIX-d
-78-
\ STRAINER DRAIN.