Why is helicopter not a modern discovery

in #history6 years ago

buyb

Leonardo da Vinci (1453-1519) drew his plans for a helicopter hundreds of years before people were fire able to fly. Helicopters are lifted into the air by their large rotating propellers or rotors. These work like narrow wings, generating lift as they spin rapidly through the air. It climbs by increasing the angle of the rotor blades. It moves forward by increasing the angle of the blade moving back on every rotation so that it pushes against the air.


FACT FILE

yyhh

The hovercraft is an ingenious machine that rides on a cushion of air. It looks like a flat-bottomed ship and is powered by huge propollers

resources: Tell me Why (Chancellor Press)
image 1: https://www.wired.com/wp-content/uploads/archive/images/slideshow/2007/11/gallery_helicopter/21_Sikorsky_VS300.jpg
image 2: https://ottawow.files.wordpress.com/2016/11/spectra2a.jpg?w=620

30875202_1924270544258858_8654628284220309504_n.gif

Sort:  

Your Post Has Been Featured on @Resteemable!
Feature any Steemit post using resteemit.com!
How It Works:
1. Take Any Steemit URL
2. Erase https://
3. Type re
Get Featured Instantly & Featured Posts are voted every 2.4hrs
Join the Curation Team Here | Vote Resteemable for Witness

Coin Marketplace

STEEM 0.35
TRX 0.12
JST 0.040
BTC 71539.00
ETH 3603.23
USDT 1.00
SBD 4.75