Flying propeller

So, without too much difficulty, you can launch yourpropeller tothesky.Quiteaninterestinggame.Inafewpeopleyoucanarrangecompetitionsandhaveagoodtime... 
Tobuildaflyingpropellerweneed:Atreebarabout20cmlongandoneandahalfcentimetersthick.Theaxisofrotationi,alsofromthetree,youcantakeapencil.Drillwithadrill.Thediameterofthedrillshouldbeslightlylessthanthediameteroftheaxis.Glue.ThePVAwillworkfine.Rulerininches.Centertheblockanddrillaholefortheaxis.Wetaketheknife.Beextremelycarefulwhendoingthisphaseofwork-trynottocutyourselfandyourself!Trytogivethemostcorrectform bladespropellerDonotforgetaboutsymmetryabouttheaxisofrotation.Rememberthatthethinnerthebladesyoucarve,theeasieryourpropellerwillbe.Alighterpropellertakesoffmoreeasily,butislessinertandmoreexposedtowind.Trytobalancethethicknessandweightofthepropeller.Theaxisofrotationshouldbesufficientlythicksoasnottobreakfromthelaunch,buttheextrathicknessisuseless.Thelengthoftheaxisofrotationshouldbe20-25centimeters.Theaxiscanbegluedtothepaddlesand,forreliability,securedwithabuttonfromthetopside.div>

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