A

David

Darling

L series (Japanese rockets)

L=4S #5

L-4S #5 on its launch pad.


The Lambda series, or L series, was Japan's first family of orbital launch vehicles. The rockets in this family were effectively scaled-up versions of the solid-propellant Kappa sounding rockets. The fifth launch of an L-4S placed Japan's first artificial satellite, Ohsumi, in orbit on February 11, 1970.

 

Data for the L-4S #5 that launched Japan's first satellite
    1st st. SOB 2nd st. 3rd st. 4th st.
total length m 16.522 5.772 8.141 4.067 1.104
weight (ig.) kg 9399.0 1005.0 3417.6 943.1 111.0
weight (b.o.) kg 4507.0 381.0 1562.5 394.9 23.05
propellant weight kg 3887.0 624.0 1845.0 547.5 87.95
mass ratio

 

1.982 2.187 2.388 4.816
specific impulse sec 215.0 220.0 242.9 249.3 254.0
center of gravity (ig.) % 59.0 52.9 63.0 61.8 64.5
center of gravity (b.o.) % 43.2 54.3 49.6 44.8 55.7
Ix (ig.) kg.m.sec2 79.89 25.48 3.52 0.259
Iy (b.o.) kg.m.sec2 16192 1259.4 99.71 0.436
net payload kg     6.6

36.3 7.62
gross payload kg     7.6 96.1 8.42
maximum diameter mm 767.0 310.0 767.0 548.0 483.0