Erkki the mainspar has been calculated to be 4 kilos empty..it has been made in layers of really thin pine sheets...clued and compressed. A bit like the Colombani's wooden bird which had actually carbon fibre core..this is volumetrically bigger wing and thus also laminated wood is viable ! It is very very lite and holds plus minus 4 Gs !
How did you came out with 35 kg empty weight?
ReplyDeleteI reduced the engine, accu, prop and landing gear weight.
ReplyDeleteAslo added few kilos ballast to the nose cone.
ReplyDeleteWhat is calculated foot launch take of speed?
ReplyDeleteWhat is estimated best glide angle and minimum vertical sink per second.
Is this glider soarable?
I have calculated the stall speed 24 KTS for 240 lbs pilot. If you have 10 m/s frontal wing you need to run 2m/s forward ( 7 km/s ). L/D is 1/20.
ReplyDeleteI mean 7 km/h running speed in 10 m/s wind.
ReplyDeletePlene alone is weightless at 26 km/h speed ( 7 m/s ) when level.
ReplyDeleteHow would you build up the mainspar and how attach the ailrons to the rear spar or false spar?
ReplyDeleteErkki the mainspar has been calculated to be 4 kilos empty..it has been made in layers of really thin pine sheets...clued and compressed. A bit like the Colombani's wooden bird which had actually carbon fibre core..this is volumetrically bigger wing and thus also laminated wood is viable ! It is very very lite and holds plus minus 4 Gs !
ReplyDeleteI have to create a lite secondary spar for the ailerons.
ReplyDelete