Þyrla

Þyrla
LAPD Bell 206
Endebyrdnesse dǣl ymbe Lyftcræfta Floccas Supported bȳ Lēohtra-þonne-Lyft Lyftingas (aerostats) Unȝemihtod Ȝemihtod • Ballōn • Lyftscip Supported bȳ LþL Lyftingas + Aerodynamic Lift Unȝemihtod Ȝemihtod • Cyndblendisc lyftscip Supported by Aerodynamic Lift (aerodynes) Unȝemihtod Ȝemihtod Unȝemihtod fæstȝefeðrod Ȝemihtod fæstȝefeðrod • Glider • hang gliders • Glīdflēoge • Kite • Ȝemihtod lyftƿæȝn • powered hang gliders • Ȝemihtod glīdflēoge • Flettner airplane • Ground-effect vehicle Powered hybrid fixed/rotary wing • Tiltwing • Tiltrotor • Mono Tiltrotor • Mono-tilt-rotor rotary-ring • Coleopter Unȝemihtod rotary-wing Ȝemihtod rotary-wing • Rotor kite • Autogyro • Gyrodyne ("Heliplane") • Þyrla Powered aircraft driven by flapping • Ornithopter Ōðer Ȝescēad Hebboðes Unȝemihtod Ȝemihtod • Hovercraft • Flying Bedstead • Avrocar

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 hélicoptère þe Gustave de Ponton d'Amecourt ǣrest ƿrāt in 1861, mid fruman fram Grēkisce helix/helik- (ἕλικ-) = þurhstandende hring oþþe ċierrende, and pteron (πτερόν) = 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.