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  1. W

    New glider design

    I don't know what a touring glider is, but it is a start in an interesting direction (btw I know what a touring motor glider is.)
  2. W

    New glider design

    Hello everyone, I have been designing aircraft for eight years now, and my last post here was in 2014 for a four seat long range aircraft. Being also a glider pilot I have decided to turn my attention to them. Glider design seems pretty straightforward as everyone pretty much copies the same...
  3. W

    Experimental Soaring Association 40th Western Workshop

    Hello Topaz and all experimental soaring association members. I am an amateur aircraft designer, and used to post here in 2014. New design for a long range aircraft This aircraft has been modified from its original form and is now in construction. The image below is an illustration of what it...
  4. W

    New design for a long range aircraft

    I would like to thank you all, this has been a very instructive thread and has focused on all the areas of my design that I should work and research more: Squarish fuselage, tadpole tail and more modern laminar flow airfoil. No one commented on the high aspect ratio, and it was really my main...
  5. W

    New design for a long range aircraft

    The above chart shows you skin frictions in both laminar and turbulent, they merge at around Re 5M and laminar flow is the best around Re 0.5 M. (other data show it's more like 1M.) I suspect that the reason ballasted glider do better, is that whatever turbulent flow that existed on the glider...
  6. W

    New design for a long range aircraft

    The WL performance is absolutely verified by the CAFE 400 race results in 87 or 88. And the friction coefficient I am talking about doesn't care about the wetted size of the aircraft. The tadpole fuselage works on a glider because it tapers slowly 60cm at the cabin to maybe 15cm in over 5...
  7. W

    New design for a long range aircraft

    I am going to try to explain my train of thought when I designed this aircraft: Laminar flow is good and is used extensively on gliders with incredible success, but one has to note that gliders, fly at Re 1M (Million) and that is precisely the best Re number for laminar flow, it is steady and...
  8. W

    New design for a long range aircraft

    Thank you bird for the tests, 1.8million R would be for the stall speed, in cruise we are looking at 3M. But that's not the point, I have been contemplating those "old" Tempest airfoils for a while and I am amazed at their good performances at Cl 0.2 to 0.6, they are actually better than the...
  9. W

    New design for a long range aircraft

    Thank you bird man, this is great help. The tempest coordinate can be fond there HAWKER TEMPEST 37.5% SEMISPAN AIRFOIL (tempest1-il) Wing loading is 87 kg/m2 chord is 0.9 m Flying height is 3000m
  10. W

    New design for a long range aircraft

    Thank you everyone for the comments and answers, I'll try to explain a bit better what I am trying to do here, First the Specifications calling for a true transatlantic aircraft: I did it for the mythical idea of Atlantic crossing but also because a real travel aircraft must be able to do at...
  11. W

    New design for a long range aircraft

    I finished this concept for a long range 4 seater, and I would like to push the design further, and even, maybe, one day build it. I know a bit about aircraft design, but I am not an engineer and not very good yet with computers as a design tool. I would greatly appreciate comments, help and...
  12. W

    is there a NACA air outlet?

    We know the NACA air inlet, but maybe we should be paying attention to air exiting the aircraft, is there an ideal design for an air outlet?
  13. W

    semi laminar airfoils and wing loading

    Can you give me some inspiration on those modern laminar airfoils? The wing I am designing will be cruising at 3M reynolds and at a Cl of 0.2. As for wing loading I don't want to go too high and at 88kg/m2 I feel that I still get a decent L/D at cruise As for wing thickness… Once you've tried...
  14. W

    semi laminar airfoils and wing loading

    Yes 12% would be still ok structurally, thicker would be lighter but with more drag, and I am looking for low cruise drag at a Cl of 0.20. the E-231 was designed for model pylon racing but it is very similar to the Tempest and I stumbled on it by chance looking at as many "Tempest like"...
  15. W

    semi laminar airfoils and wing loading

    Hello everyone, I am a new member and would like to introduce myself here in Aircraft design as it is what interests me. I am a pilot (glider and aircrafts 500 hours in each), a designer by trade, an organic farmer by need and an aircraft designer by love. My daily work allows me to think a lot...
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