Language: Mandarin Chinese
Source: Classical literature

Chángqiāng (長槍) literally means "long spear".

The Huangchao Liqi Tushi (皇朝禮器圖式) of 1766 lists a lùyíng chángqiāng (綠營長槍) or "The Green Standard Army Long Spear":¹

"According to the regulations of the dynasty; Green Standard Army Long Spear:
Spearhead made of forged steel.
Overall 1 zhang 4 chi long.
Spearhead is 7 cun long.
Shaft is 1 zhang 3 chi long with a circumference of 3 cun 7 fen.
Made of wood, lacquered vermillion.
It has a red yak hair tassel.
Steel fitting at end is 3 cun long."

Converted to cm
Overall: 490 cm
Head: 24,5 cm
Shaft: 455 cm
End fitting: 10,5 cm

Spears of the Qing dynasty.
#4 is the Lùyíng Chángqiāng or "Green Standard Army Long Spear".
The figure is 175 cm tall.
Click to enlarge

Notes
1. Huangchao Liqi Tushi (皇朝禮器圖式) of or "Illustrated Regulations on the Ceremonial Paraphernalia of the Dynasty". An illustrated work commissioned by the Qianlong emperor in 1750, the first manuscript was finished in 1759 and the first woodblock-printed edition was completed in 1766.
2. Based on a 1 chi equals 35 cm conversion.