Kulmaminuutti

Kulmaminuutti eli minuutti (tunnus ′, yläpuolinen indeksointipilkku) on asteen kuudeskymmenesosa. Kulmaminuutti jakaantuu edelleen kuuteenkymmeneen kulmasekuntiin.[1] Kulmaminuutin mittaista osaa ympyrän kaaresta kutsutaan kaariminuutiksi.

Tarkkuusammunnassa kulmaminuutista käytetään joskus englanninkielistä lyhennettä MOA (minute of angle). Luodikon osumakuvion, puhekielessä kasan koko ilmoitetaan toisinaan kulmaminuutteina[2], sillä se on suhdeluku ja saadun osumakuvion koko vertautuu näin ilmoitettuna ampumaetäisyyteen.

Jos aseella on ammuttu esimerkiksi 100 metrin etäisyydeltä ja osumat ovat alueella,jonka halkaisija on 30 millimetriä, voidaan sitä verrata yhtä kulmaminuuttia vastaavaan, laskennallisen kuvion kokoon. Tämä luku saadaan

joka on pyöristettynä noin 29,1 mm. Lukua pidetään laatukriteerinä esim. testeissä metsästyskiväärille.[3] Vastaavasti yhden kulmaminuutin kasan koko kolmensadan metrin etäisyydellä olisi noin 87,3 mm.

Lähteet

  1. ↑ Suomen Standardoimisliitto: SI-opas (myös painettuna, ISBN 952-5420-93-0) (PDF) (Sivu 8.) SFS-oppaat. 04.11.2002. Suomen Standardoimisliitto. Arkistoitu 31.8.2012. Viitattu 18.12.2011.
  2. ↑ Kasa-ammunta, Suomen Ampumaurheiluliitto
  3. ↑ Erä 7/2013
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