Student Pilot Posted March 24, 2019 Share Posted March 24, 2019 Just go up 4 posts; the 3 view drawing is there; it's fully enclosed so you can't see the internal tube frame but basically the same setup as the HM-1000 But not a flying flea design; it's a boxwing. So basically a side by side Ligeti Stratus? Link to comment Share on other sites More sharing options...
Blackhawk Posted March 24, 2019 Share Posted March 24, 2019 No, it's a side by side boxwing design, but not a Ligeti Stratus. Link to comment Share on other sites More sharing options...
spacesailor Posted March 24, 2019 Share Posted March 24, 2019 Just another "woe be me" It's not just weight that get you, It's that BUREAUCRATIC Wing load Rule. spacesailor Link to comment Share on other sites More sharing options...
Blackhawk Posted March 24, 2019 Share Posted March 24, 2019 Oh, Yeh ! Link to comment Share on other sites More sharing options...
kasper Posted March 24, 2019 Share Posted March 24, 2019 Just another "woe be me" It's not just weight that get you, It's that BUREAUCRATIC Wing load Rule. spacesailor Nope. If you are 95.55 you are not wing load measured but stall speed restricted. And if it’s 2 seats and RAAus ultralight it’s got to be 95.55. Link to comment Share on other sites More sharing options...
spacesailor Posted March 24, 2019 Share Posted March 24, 2019 Stall speed restricted, Is it a different Stall speed to 95-10, ?. spacesailor Link to comment Share on other sites More sharing options...
M61A1 Posted March 24, 2019 Share Posted March 24, 2019 Nope. If you are 95.55 you are not wing load measured but stall speed restricted. And if it’s 2 seats and RAAus ultralight it’s got to be 95.55. Go outside......find a good solid brick wall....bang your head against it repeatedly. Same result. Link to comment Share on other sites More sharing options...
Thruster88 Posted March 24, 2019 Share Posted March 24, 2019 This is my concept mid boom propeller aircraft; a bit heavier the yours at 600kg MTOW and the boom has more support from below. It should have very good handling characteristics and light on fuel. Unfortunately no folding wings. [ATTACH]38911[/ATTACH] Hi Blackhawk,, interesting design it will look good. Have you calculated the CG and centre of lift ? It looks nose heavy to me. Link to comment Share on other sites More sharing options...
rotax618 Posted March 24, 2019 Share Posted March 24, 2019 Sorry, I should read the posts more thoroughly before commenting. Your design has merit, I have not studied the aerodynamics of box wing types, but I believe they have structural and aerodynamic advantages and there have been some successful examples. I built a Flying Flea many years ago to understand their supposed advantages, unfortunately I did not enjoy flying it, the delay in yaw/roll couple was very uncomfortable. Others find them acceptable. I don’t know how far you are in the design but I suppose a large scale RC model will give you the CG and a fair idea of any vices before you commit to any structural analysis. I look forward to hearing of your progress. Link to comment Share on other sites More sharing options...
Blackhawk Posted March 24, 2019 Share Posted March 24, 2019 Only a concept. Link to comment Share on other sites More sharing options...
Deskpilot Posted March 25, 2019 Author Share Posted March 25, 2019 BK, now that's a beautiful design. I once had the wish to build a Sunny Box-wing but found that the original safe design had been taken over by a new developer and had been made unsafe(according to the original designer). I think you should seriously consider building your plane as IMO, it's a winner. IF you were to decide to add contra-rotating props, how would you do it? Just asking. Link to comment Share on other sites More sharing options...
Blackhawk Posted March 25, 2019 Share Posted March 25, 2019 There are a lot of difference way's to produce a coaxial propeller drive This sketch could be one Or you could use one of these https://www.youtube.com/results?search_query=Drive+for+coaxial+propellers+1+-+10 Just work on what suits your application best; but I would use belts to the prop shafts. Link to comment Share on other sites More sharing options...
kasper Posted March 25, 2019 Share Posted March 25, 2019 Stall speed restricted, Is it a different Stall speed to 95-10, ?. spacesailor [ATTACH]38930[/ATTACH] Yes 95.10 has NO stall speed restriction. It is NOT defined by stall speed at all. It is wing area limited. 95.55 IS stall speed restricted. It give not a damn about how you achieve that stall speed just that you claim to meet the stall speed required. If you use 15m^2 of wing without flaps or 9m^2 with really complex flaps does not matter so long as the stall is low enough. End of. Can’t be clearer. The two registration series are measured for compliance in completely different ways. Link to comment Share on other sites More sharing options...
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