India's GSLV cryogenic upper stage (CUSP) and its relationships

 

 1. Russian former cryogenic upper stage concepts



S5.86 engine without nozzle extension


      
KVRB concept with KVD-1 engine (S5.86)

 
Small KVD-1 steering engine


                    
GCUS concept with KVD-1M engine



Gimbal-mounted engine KVD-1M

 

 Stage

Designer

Diameter (m)

Fuel (t)

Engine

Thrust (kN)

Isp (sec)

Used for

Launches

KVRB

Khrunichev SC 3.60 18.00

Khimmash KVD-1

73.58 461

Proton-KM

-

GCUS

3.60 19.00

Khimmash KVD-1M

100.6 ...103.0 461

Angara A-5

-

12KRB

2.80 12.50

Khimmash KVD-1

73.6 461

GSLV Mk.1 & Mk.1+

5

15KRB

15.20

Khimmash KVD-1

73.6 461

GSLV Mk.1+

1

CUSP

Indian industry 12.80

CUS

73.55 452

GSLV Mk.2

5

CUSP+

15.20

CUS

73.55 452

GSLV Mk.2+

0

 

 2. Russian cryogenic upper stage 12KRB for India's GSLV



 



KVD-1 engine



 

 

 3. Indigenous cryogenic upper stage CUSP for GSLV


           




      
Engine CUS (without nozzle)



CUS engine




CUS combustor


        
Small Vernier engine combustor