description of s-ii stage structures

8/4/2019 Description of S-II Stage Structures

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RELLCOMM, INC .

-L -.-

SUBJECT: D eec r ip t io n o f S-11 Stage

S t r u c t u r e s - Case 320

DATE: A p r i l 20 , 1967

FROM: T. H. Crowe

ABSTRACT

This memorandum provides a de sc r i p t io n of th e S - I 1

s t a g e s t r u c t u r e i n s u f f i c i e n t d e t a i l t o e n ap le t h e r e ad er t o

a s s e s s th e irnpzct of major pr3biems and changes t o t h e s i r u c -

t u r e .



SUBJECT: Des c r ip t i o n o f 3-11 Stage DATE: A p r i l 20, 1967

S t r u c t u r e s - Case 320

FROM: T. H. Crowe

MEMORANDUM FOR FILE

I n t r o d u c t i o n--

The purpo se of t h i s memorandum i s t o p rov ide ad e s c r i p ti o n of t h e S -I 1 s ta g e s t r u c t u r e i n s u f f i c i e n t d e t a i lt o enab1.e the reader t o assess the impact o f major; prc7blema

and chang es t o t h e s t r u c tu re .

F ig u re 1 i s a n exploded view showing the p r in c i p a lcomponents of th e s t r uc tu re : t h e f or wa rd s k i r t , LE2 tank , LOX

tank, t h r u s t s t r u c t u r e and a f t s k i r t , and t h e a f t i n t e r s t a g e .An exploded view showing some of t h e d e t a i l s of' c o n s t r u c t i o n

of t h e S-11 st ag e a r e shown on Fig ure 2. The dry weight ofth e S-11-1 s ta ge i s approximately 90,000 pounds and t h e d r yw ei gh t of t h e a f t i n t e r s t a g e i s 14,000 pounds.

A f t I n t e r s t a g g

The a f t i n t e r s t a g e i s a c y l i n d e r 219 inches long

of 7075 aluminum. I t i s of semi-monocoque c on st ru ct io n wi the x t e r n a l h a t s e c t i o n s t r i n g e r s r i v e t e d t o t h e sk i n. Thes k in and s t r i n g e r s a r e s u pp or ted by i n t e r n a l r i n g s . The aftr i n g h a s p r o vi s i o n f o r t h e f i e l d s p l i c e f o r m ating w it h t h e



support ed by in t e rn a l r ing s . The s k i r t i s a t t a c h e d t o t h e

b o l t i n g r i n g a t t h e f or wa rd end and t o t h e a f t i n t e r s t a g e a tt h e a f t end. F i ve LH2 l i ne s a r e rou ted f rom th e bot tom of

t h e LH2 t a nk down th e e x te r io r of the sk i r t , t hrough th e

s k i r t and down the th ru s t s t r uc t u r e to the e ngine s. The LOX

fill and d r a i n l i n e i s a l so rou te d th rough the s k i r t andt h r u s t s t r u ct u r e.

The th rus t s t r uc tu r e i s a c on ic a l f r us tum wi th a

forward diamet er of 396 inches, an a f t diameter of 210 inch esand a l ength of 111 inc hes . The frustu m i s a t t a ch e d t o t h ei n t e r i o r of t h e a f t s k i r t 61 i n ch e s a f t o f .b o l t i ng r i n gin te r f a c e w i th the s k i r t . The f rus tum i s made up of e x t e r n a lhai; s e c t i o n s t r i n g e r s r i v e t e d t o t h e s k i n . The s k i n and s t r i n g e r sa r e suppor ted by in te rn a l r ings . The fo ur ou tboard enginesa r e mounted on the a f t r i ng . A t e ac h eng ine a t t a c h po in t a r etwo l on ge ro ns t o a s s i s t i n s he ar in g t h e e ng in e l o a ds i n t o t h eth ru s t s t r u c tu r e . The c e n te r e ng ine i s mounted on a center

en gi ne supp ort assembly co ns is ti ng of f o u r honeycomb sandwichtype beams jo ined a t t he s tage cente r l i n e by a machined f i t t i n g .The outboard ends a r e a t tached t o th e th ru s t s t ru c t ur e cone .

The LH2 feed l in es a r e a t tach ed t o the ex te r i or of

th e cone a s ar e var iou s components of th e e l e c t r i c a l , measure-ment, co nt ro l and ot he r s tage subsystems.

F igure 4 i s a p ic tu re of th e assembly du ring manu-f a c t u r e .

Heat Shield



t o t he LF$ and LOX t anks . The j o i n t i ncorpora t e s a r i n g fo r

a t t a c h i n g t h e t an k t o t h e LH2 t a n k b o l t i n g r i n g .

The a f t bulkhead of t he tank i s made up of 12 g oresand a cen te r c i rc u la r se c t i on welded toge ther . At tached tot h e c e n t e r o f t h e a f t bulkhead Is a sump. The sump has i n i t

f i v e LOX o u t l e t l i n e s , one f i l l and d ra i n l i n e and a n accessmanhole. Figure 6 de pi c t s an a f t bulkhead be ing assembled.

The forward o r cornnion bulkhead i s of honeycomb sand-

wich cons t ruc t ion wi th in su la t i on sandwiched between p l a t es ofaluminum. The two p l a t e s a r e each made up of 12 go re s and acen t e r c l r c u l a r sec t i on welded t oge t he r . P rov i si on i s made I nth e bulkhead f o r purging and a l.eak d e t e c t i o n system.

I n t he bott om of t he t ank i s a c ruc i form ant i -vor texb a f fl e . Three s l a s h b a f f l e r i n g s a r e su pp mt ed by s t r u t s i n t h etank. A mast n ea r t h e ce n te r o f t h e t z n ~uppor t s a p r e ssu r i za -t i o n d i s t r i b u t o r and t h e LOX vent l i ne s . Cutout s a r e provided

f o r t h e p r e s s u r i z a t io n g a s i n l e t , and t h e v en t l i n e o u t l e t .

LH, TankC

The LH:, t ank i s made up of s i x cy l i nd r l ca l sec t ion s ,

an e l l i p s o i d z l forward bu lk and th e csmmon-bulkhesd. The volumeof t he LH2 tank i s 36,553 cu. f t . The forward bulkhead and t h e

th e cy l i nd r i ca l se c t i on s a r e of 2014 aluminum covered wi the x t e r n a l i n s u l a t i o n .

The cyl indr ica l sectdon.s ar e made up of quara te r pane l s



The forward bulkhead i s con s t r uc te d o f 12 we lded gore s

and a c i r c u l a r s e c t i o n welded a t t h e c e n t e r . A cces s t o t h e t a n ki s t h r o u gh a m anh ole i n t h e c e n t e r o f t h e f o r wa rd b u lk h e ad .

One f i t t i n g f o r p r e s s u r i z a t i o n and two f o r v en t i n g a r ep r o v i de d i n t h e f o r wa r d b u lk he ad . F i v e f i t t i n g s f o r LEI2 eng ine

l i n e s , one f o r Lt12 r e c i r c u l a t i o n r e t u r n l i n e , and one f o r f i l l

and d r a i n a r e p ro vi de d i n t h e c y l i n d r i c a l s e c t i o n J u s t f or wa rdo f t h e b o l t i n g r i n g .

I n s t a l l e d i n th e i n t e r i o r of t h e ta nk i s t h e c o n t i n u o u sl e v e l pr ob e and a p r e s s u r i z a t i o n g a s d i f f u s e r .

insulation on t h e c y l i n d r i c a l s e c t i o n and t h e f o rw ar dbulkhead i s e x t e r n a l t o t h e t an k. I t c o n s l s t s o f g l a s s - ph e n o li choneycomb c or e f i l . l e d wi th isocyana. te foam covered wi-th an y lo n p h e n o li c s k i n and s e a l e d w i t h a p l a s t i c f i l m . P r o v i s i o ni s made i n t h e i n s u l a t i o n f o r pu rg in g and a l e a k d e t e c t i o n s ys -

tem. I n s u l a t i o n o n t h e b o l t in g r i n g i s machined blocks ~f p l a s t i c .

Forward Sk i r t

The forward s k i r t i s made of 7075 aluminuin s k i n wi the x t e r n a l l o n g i t u d i n a l h a t s e c t i o n s t r i n g e r s . The s k i n a nds t r i n g e r s a r e s up po rt ed by f o u r i n t e r n a l r i n g s . The s k i r t i s137 i n c h es lo n g. The a f t end b o l t s t o t h e c y l i n d r i c a l p o r t i o nof the LH2 t a n k an d t h e f o rw ar d end h a s p r o v i s i o n f o r t h e f i e l d

s p l i c e t o t h e S-IVB i n t e r s t a g e .

A door i s p ro vi de d f o r a cc e s s and c u t o u t s a r e p r ~ v i d e dn 1



Copy t o

Messrs . J . H. Disher - NASA/MLDG . F. Esenwein, J r . - NASA/MATL. K. F er o - NASA/IJILVJ. P. F i e l d - NASA/MLPT. A . Keegan - NASA/JW-2R . C . Mapp, S r . - NASA/MAPW. B. Tay lo r - NASA/MLA

A T . AckermanC . BidgoodD. R , HagnerW . C . H i t t i n g e r .B. T . Hwarc!J . Z . MenardI D. NehamaJ. J . O I C o n n ~ rT. L. P ~ w e r sI. M. RossW. S t r a c kT. H. ThompsonR. L. WagnerA l l Members De~artment1024C e n tr a l F i l e sDepartment 102,

L i b r a r y t.



REE'ERENC S

1. Model S p e c i f i c a t i o n f o r S a t u r n S - I 1 S t ag e , NAA SID 61 - 5 1 . ,7/2 7 /6 3.

2 . M o d e l S p ec i f i c a t i o n J - 2 Rocket Engine, Rocketd yne, 7/20/60.

3. Sa tu rn S - I1 Genera l Manual, NAA SM-S-11-01, 10/1/64.

4. S-I1 Von Braun Br ief ing , NAA S ~ 6 4 - 2 4 , 2 /6 4.

5. S a t u r n S - I 1 Q u a r t e r l y Reviews 1 t h rough 4, NAA, 1963 t o 1 9 6 7 .

6. S a t u r n V PUP, MSFC, 8/65.

7. S a t u r n ?-I1 Systems and Associa ted GSE F a m i l i a r i z a t i o n ,NAA ST66-18, 12/66.



FORWARD SKIRT

4 SECTIONS

FORWARD

BULKHEAD

12 GORE

SEGMENTS

& ACCESS

/

SZbm,SECTIONS

EACH

FABR I ATED

I 'QUARTER

SECT1 ONS

99" H I G H

W I T H M I L L E DSKINS, STRINGERS,

& R I N G F R A M E S

lNTERNAL

27" HIGH \

1 LH2 CYL

STRl NGERS

CY I

I C O M M O N B U L K H E A D ,

C O M M O N B U L K

I

AFT LOX BULKH

12 GORE SEGMENT

& 12 WAFFLESECTIONS

B O L T I N G R I N G aLOX SUMP

12 SEGMENTS

LINDER 1I

12 SECTIONS I I

FIGURE 2 - S-l l EXPLODED VIEW

I 4 SECTIONS

T H R U S T

STRUCTURE

4 SECTIONS

5 J-2

E N G I N E S

A F T ' '

l TERSTAGE

18.5 H l G H

8 SECTIONS



F IGURE 9 - FORWARD SK IRT

description of s-ii stage structures

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