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Þyrla is lyftcræftes cynd mid spinnendum feðrum. Ƿiþ fæstȝefeðrod lyftcræftas, þus þyrlas magon rihtuppƿearde flēogan, on lyfte standan, and flēogan forþ, bæcƿearde, and hande bȳ hande. 

Mǣste sprǣċe þǣre ƿorulde brūcaþ þæt ƿord helicopter, beinnende Nīƿenglisc, fram Frenċisce  þe Gustave de Ponton d'Amecourt ǣrest ƿrāt in 1861, mid fruman fram Grēkisce helix/helik- () = þurhstandende hring oþþe ċierrende, and pteron () = feðer.

Man ƿorhte þyrlas on flyhtes fyrmestum healfȝēarhundrede, mid þǣm Focke-Wulf Fw 61 bēonde se fyrst fremmende þyrla, in 1936. Menn ƿorhton sum þyrlas, ac ne ƿæs hit þe oþ 1942 þæt þyrla þe Igor Sikorsky ƿorhte cōm to fulƿeorcscipe bȳ 131 lyftcraftas ƿorht.

Þēah mǣst ǣror þyrlas hæfdon mā þonne ān hēafodspinnere, hit ƿæs se ānliċ hēafodspinnere mid ƿiþspinmihteliċum tæȝlspinnere þe man reċþ ƿoruldƿīde to bēonne se þyrla.

Fruman 

Lyftcræftas