Country of originChina
First flight1995-11-28
DesignerChina Hexi Chemical and Machinery Corporation
ApplicationKick engine
Associated LVLong March 2E
StatusOut of Production
Solid-fuel motor
Thrust (vacuum)190 kN (43,000 lbf)
Specific impulse (vacuum)293 s (2.87 km/s)
Total impulse1.589 MN (357,000 lbf)
Burn time87s
Length2,936 mm (115.6 in)
Diameter1,700 mm (67 in)
Dry weight557 kg (1,228 lb)
Used in
Long March 2E EPKM

The FG-46 (a.k.a. EPKM and SpaB-170) is a Chinese spin stabilized solid rocket motor burning HTPB.[4] It was developed by China Hexi Chemical and Machinery Corporation (also known as the 6th Academy of CASIC) for use in the Long March 2E on GTO missions. It first flew as a prototype SPTS-M14 on July 16, 1990 on the Badr A mission. It had its first commercial mission orbiting the AsiaSat 2 on November 28, 1995 and exactly one month later, on December 28 its second and last mission for EchoStar 1.[1][4][5]

It has a total nominal mass of 6,001 kg (13,230 lb), of which 5,444 kg (12,002 lb) is propellant load and its burn out mass is 529 kg (1,166 lb). It has an average thrust of 190 kN (43,000 lbf) with a specific impulse of 292 seconds burning for 87 seconds, with a total impulse of 1.589 MN (357,000 lbf). It is spin stabilized at 40 rpm and the propellant mass can be reduced by up to 350 kg (770 lb) eight months before launch or up to 15 kg (33 lb) on the launch site.[1]


  1. ^ a b c "Chapter 2 — General Description to LM-2E". LM-2E User's Manual. Issue 1999 (pdf). CASC. 1999. pp. 2–18. Retrieved 2015-07-08.
  2. ^ "EPKM". Encyclopedia Astronautica. Retrieved 2015-07-25.
  3. ^ McDowell, Jonathan. "5.6.8: FG-46". Jonathan Space Report. Retrieved 2015-07-25.
  4. ^ a b Norbert Bgügge. "Some Chinese solid fuel aerospace motors". B14643.DE. Archived from the original on 2015-09-26. Retrieved 2015-07-25.
  5. ^ Norbert Bgügge. "Propulsion CZ-2E, CZ-2F". B14643.DE. Retrieved 2015-07-25.