Berrie
Oct 16, 2006, 02:07 PM
After a diskussion at an modelflightclub evening I became confused about the torsionstrength of the wingjoiners of my vacuumbagged wing.
The wing is a 3.3mtr wing for an electric “F3J” plane.
Span: 33,4 dm
Tail area: 6,9 dm^2
Wing area: 70,39 dm^2
Tailboom: 9,38 dm
Aspect ratio: 15,85
wing meanchord: 2,11 dm
TVR: 0,436 (TVR = tail area/wing area * tail arm / wing chord)
Flyingweight approx: 2550,00Gr
Wingload: 36,24
Profile: HQ/W2,5-8,5
This is plane is for thermal juration flying (and for building fun) so there are now very heavy loads to calculate as for dynamic soaring an winchlaunches. Only a 100mtr dive must be survived and some wisthle crossing from left airspace to the right airspace.
For now I have the outher wingpanels ready. They consist of blue foam and have a carbonspar with a round carbon wing joiner. Behind the aileron hingeline there is now secundary spar. The wingpanel rooth is from 10mm thick medium soft balsa, in witch the torsion dowels will come. The core is covered with one layer 50gram glas and 80 gram glas, all under 45°! Close to the panelrooth there is one layer of 80 gram extra glas, under 90°, to reinforce this part.
I would like to drive the ailerons and flaps as misterHarley has with his Genius and mister Drela with his Supra. Witch means that the servo’s all will find a place in the centrewing panel. That means that the core near one of the torsiondowels will be removed to give space to the aileronservo. I’ve tried to make a picture to make my self clear:
http://www.rcgroups.com/forums/showatt.php?attachmentid=1025883&stc=1
The centrewingpanel will be covered with one layer 50gram glas, 93 grams carbon under 45° and the same 90° 80grams glas reinforcing over the 10mm thick medium soft balsa panelrooth. The dowel consists of an 8/6mm glastube with 6mm carbn rod ( a bit heavy, but easy for me to get..) They will be glued into the wingpanels for 20mm. For location see picture.
http://www.rcgroups.com/forums/showatt.php?attachmentid=1025884&stc=1
My question: will this be strong enough to surive torsionloads?!?!? The carbondowels will be strong enough. I have my doubts about the wingcore/glasskin and balsa panelrooth (altough the glastube has a large “pressurearea” and the rooth is 10mm thick..)
The wing is a 3.3mtr wing for an electric “F3J” plane.
Span: 33,4 dm
Tail area: 6,9 dm^2
Wing area: 70,39 dm^2
Tailboom: 9,38 dm
Aspect ratio: 15,85
wing meanchord: 2,11 dm
TVR: 0,436 (TVR = tail area/wing area * tail arm / wing chord)
Flyingweight approx: 2550,00Gr
Wingload: 36,24
Profile: HQ/W2,5-8,5
This is plane is for thermal juration flying (and for building fun) so there are now very heavy loads to calculate as for dynamic soaring an winchlaunches. Only a 100mtr dive must be survived and some wisthle crossing from left airspace to the right airspace.
For now I have the outher wingpanels ready. They consist of blue foam and have a carbonspar with a round carbon wing joiner. Behind the aileron hingeline there is now secundary spar. The wingpanel rooth is from 10mm thick medium soft balsa, in witch the torsion dowels will come. The core is covered with one layer 50gram glas and 80 gram glas, all under 45°! Close to the panelrooth there is one layer of 80 gram extra glas, under 90°, to reinforce this part.
I would like to drive the ailerons and flaps as misterHarley has with his Genius and mister Drela with his Supra. Witch means that the servo’s all will find a place in the centrewing panel. That means that the core near one of the torsiondowels will be removed to give space to the aileronservo. I’ve tried to make a picture to make my self clear:
http://www.rcgroups.com/forums/showatt.php?attachmentid=1025883&stc=1
The centrewingpanel will be covered with one layer 50gram glas, 93 grams carbon under 45° and the same 90° 80grams glas reinforcing over the 10mm thick medium soft balsa panelrooth. The dowel consists of an 8/6mm glastube with 6mm carbn rod ( a bit heavy, but easy for me to get..) They will be glued into the wingpanels for 20mm. For location see picture.
http://www.rcgroups.com/forums/showatt.php?attachmentid=1025884&stc=1
My question: will this be strong enough to surive torsionloads?!?!? The carbondowels will be strong enough. I have my doubts about the wingcore/glasskin and balsa panelrooth (altough the glastube has a large “pressurearea” and the rooth is 10mm thick..)