Propulsion OTRAG


Zaire-Type Vehicles  (HNO3 oxidizer)

CRPM

Fueling

Engines

Tank pressure

Thrust s.l.

Isp s.l.

Thrust vac

Isp vac

Propellant

Mix

Nom. burn time

Flow rate

Total Imp

length (m)

status

bar

kN

N*s/kg

kN

N*s/kg

tons

F/O

sec

t/s

MN*s

6

66%

4

30

109,2 ~1800 125.3 ~2064 0.564 1 : 4.8 12.5 0.0607 1.164

Before burn out

10

(60)

(68.8)

0.0333

Average thrust

79.8

91.5 0.0443

 

12

66%

4

30

109,2 ~1800 125.3 ~2064 1.128 1 : 4.8 25.5 0.0607 2.329

Before burn out

10

(60)

(68.8)

0.0333

Average thrust

79.8

91.5 0.0443

Libya-Type Vehicles  (HNO3 oxidizer)

CRPM

Fueling

Engines

Tank pressure

Thrust s.l.

Isp s.l.

Thrust vac

Isp vac

Propellant

Mix

Nom. burn time

Flow rate

Total Imp

length (m)

status

bar

kN

N*s/kg

kN

N*s/kg

tons

F/O

sec

t/s

MN*s

6

66%

1

30

27.5 ~1800 31.5 ~2064 0.282 1 : 4.8 25.5 0.0153 0.582

Before burn out

10

(15)

(17.2) 0.0083

Average thrust

20

22.7 0.0111

 

12

66%

1

30

27.5 ~1800 31.5 ~2064 0.564 1 : 4.8 51 0.0153 1.164

Before burn out

10

(15)

(17)

0.0083

Average thrust

20

22.7 0.0111

 

24

66%

1

30

27.5 ~1800 31.5 ~2064 1.128 1 : 4.8 101 0.0153 2.329

Before burn out

10

(15)

(17)

0.0083

Average thrust

20

22.7 0.0111

Esrange Vehicle  (HNO3 oxidizer)

CRPM

Fueling

Engines

Tank pressure

Thrust s.l.

Isp s.l.

Thrust vac

Isp vac

Propellant

Mix

Nom. burn time

Flow rate

Total Imp

length (m)

status

bar

kN

N*s/kg

kN

N*s/kg

tons

F/O

sec

t/s

MN*s

3

53%

1

30

27.5 ~1800 31.5 ~2064 0.1068 1 : 4.8 9.5 0.0153 0.220

Before burn out

10

(15)

(17.2) 0.0083

Average thrust

20

22.7 0.0111

Vehicles with HDA oxidizer*

CRPM

Fueling

Engines

Tank pressure

Thrust s.l.

Isp s.l.

Thrust vac

Isp vac

Propellant

Mix

Nom. burn time

Flow rate

Total Imp

length (m)

status

bar

kN

N*s/kg

kN

N*s/kg

tons

F/O

sec

t/s

MN*s

6

78%

1

40

35.0 ~2251 38.5 ~2476 0.336 1 : 5.1 30 0.0156 0.832

Before burn out

15

(15)

(16.5)

0.0067

Average thrust

25.0

27.5 0.0111

 

12

78%

1

40

35.0 ~2251 38.5 ~2476 0.671 1 : 5.1 60 0.0156 1.637

Before burn out

15

(15)

(16.5)

0.0067

Average thrust

25.0

27.5 0.0111

 

24

78%

1

40

35.0 ~2251 38.5 ~2476 1.342 1 : 5.1 120 0.0156 3.323

Before burn out

15

(15)

(16.5)

0.0067

Average thrust

25.0

27.5 0.0111
* The specific impulse here is 25% lower as predicted by Lutz Kayser, and corresponds approximately to the estimates by analysts