HEAT grenade with 300 mm (12 in) RHA penetration[2]
Caliber
55 mm (2.2 in) (tube) 89 mm (3.5 in) (HEAT round)[2]
Action
Single shot
Rate of fire
3 to 5 rounds per minute[2]
Muzzle velocity
160 m/s (520 ft/s)[2]
Effective firing range
300 m (330 yd)[2]
Maximum firing range
700 m (770 yd)[2]
Sights
Optical, 4x
55 S 55 (from Finnish 55 millimetrin sinko vuodelta 1955, '55 millimetre recoilless anti-tank weapon model 1955'),[2] colloquially kevyt sinko and nicknamed Nyrkki,[3] was a Finnish recoilless anti-tank weapon from the mid-1950s. The 55 S 55 was designed by a Finnish Defence Forces team led by MSc, Capt Esko Puronto, and it was manufactured by FDF's Vammaskoski factory (now part of Finnish state military industrial enterprise Patria).[3]
^ abc"Konepajaosasto 1950—1980". lonnstrominmuseot.fi (in Finnish). Teresia ja Rafael Lönnströmin Säätiö. Archived from the original on 13 May 2019. Retrieved 31 January 2020.
^ abcdefghiPanssarintorjuntaohjesääntö: Osa 1 (PstO I), Kevyt sinko (in Finnish). Finnish Defence Forces HQ (Pääesikunta). 28 June 1960.
^ abPiesala, Aki (16 October 2018). "Lääkkeitä panssarintorjunnan kriisiin : Panssarintorjunta-aseiden hankinnat ja kehitys Suomessa 1948-1968" (PDF). utupub.fi (in Finnish). University of Turku. Archived (PDF) from the original on 31 January 2020. Retrieved 31 January 2020.
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