FG-15

{{Infobox rocket engine

|name =FG-15B

|image =

|image_size =

|caption =

|country_of_origin=China

|date =

|first_date =1986-02-02

|last_date =

|designer =China Hexi Chemical and Machinery Corporation

|manufacturer =

|purpose =Apogee kick motor

|associated =Long March 3

|predecessor =FG-02

|successor =FG-36

|status =Out of Production

|type =solid

|oxidiser =AP

|fuel =HTPB

|grain =

|core =

|casing =Fiberglass

|nozzle =

|description =

|combustion_chamber=1

|nozzle_ratio =

|thrust =

|thrust_at_altitude=

|thrust(Vac) ={{convert|40.9|kN|lbf|abbr=on}}

|thrust(SL) =

|thrust_to_weight=

|chamber_pressure=

|specific_impulse=

|specific_impulse_vacuum={{convert|289|isp|abbr=on}}

|specific_impulse_sea_level=

|total_impulse ={{convert|1.432|MN|abbr=on}}

|burn_time =35s

|gimbal =

|capacity ={{convert|505|kg|lb|abbr=on}}

|dimensions =

|length ={{convert|1489|mm|in|abbr=on}}

|diameter ={{convert|896|mm|in|abbr=on}}

|dry_weight ={{convert|75|kg|lb|abbr=on}}

|used_in =Dong Fang Hong 2

|references =

|notes =

}}

The FG-15 (AKA DFH-2 AKM and SpaB-170) was a Chinese spin stabilized apogee kick motor burning HTPB-based composite propellant. It was developed by China Hexi Chemical and Machinery Corporation (also known as the 6th Academy of CASIC) for use in the Dong Fang Hong 2 satellite bus for insertion into GSO orbit.

It has a total nominal mass of {{convert|580|kg|lb|abbr=on}}, of which {{convert|505|kg|lb|abbr=on}} is propellant load and its burn out mass is {{convert|75|kg|lb|abbr=on}}. It has an average thrust of {{convert|40.9|kN|lbf|abbr=on}} with a specific impulse of 289 seconds burning for 35 seconds, with a total impulse of {{convert|1.432|MN|abbr=on}}. This motor introduced a series of innovations for the Chinese solid motor industry: first use of glass fibre wound cases, carbon/carbon nozzle throat insert material, contoured divergent nozzle, and non-destructive test of the motor grain.

The initial version had the manufacturing code FG-15 was associated to the DFH-2 bus and flew twice. The FG-15B was used by the DFH-2A bus and flew five times.

class="wikitable sortable mw-collapsible mw-collapsed" !Date !Carrier Rocket !Motor !Launch site !Mission !Result
1984-01-29	Long March 3	FG-15	Xichang Satellite Launch Center	STTW-T1	Failure to ignite
1984-04-09	Long March 3	FG-15	Xichang Satellite Launch Center	STTW-T2	Success
1986-02-02	Long March 3	FG-15B	Xichang Satellite Launch Center	DFH-2A-T1	Success
1988-03-09	Long March 3	FG-15B	Xichang Satellite Launch Center	ChinaSat-1 (DFH-2A-T2)	Success
1998-12-24	Long March 3	FG-15B	Xichang Satellite Launch Center	DFH-2A-T3	Success
1990-02-05	Long March 3	FG-15B	Xichang Satellite Launch Center	DFH-2A-T4	Success
1991-12-28	Long March 3	FG-15B	Xichang Satellite Launch Center	ChinaSat-4 (DFH-2A-T5)	Failure to ignite