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  1. M

    Wing Max CL compared to existing homebuilts

    First of all I'd like to ask if anyone is aware of a reliable method to calculate the wing Max CL with regards to aspect ratio. I know of several methods to calculate the lift curve slope but this will not tell me when the wing will actually stall and what Cl i get at that point. I have also...
  2. M

    Centre of pressure of airfoil?

    As far as I undersand the 25% MAC is just a convenient point that has been choosen. You could choose the 40% point or even 100% point if you wanted to. The actual aerodynamic centre will vary with airfoil, angle of attack and at very high speeds it will even end up behind the trailing edge of...
  3. M

    Effective angle of attack for a section

    Thanks guys. I found the Schrenk's method last night and it looks a lot easier and surprisingly accurate! I will study and see if I can apply it now.
  4. M

    Effective angle of attack for a section

    I am trying to draw a span lift distribution chart but my maths knowledge is too rusty these days (currently trying to revise it). "Theory of wing sections" page 22 gives a formula to calculate the effective angle of attack for a wing section but I am unable to extract a value from it:tired...
  5. M

    Airfoil selection

    Thanks! A grit 36 sand paper would be very rough! I think I will go for something inbetween the two curves then. I am not likely to be able to build a wing with perfect smoothness nor is it going to be like sandpaper :) Thanks for your help!
  6. M

    Airfoil selection

    Tack Jan! Det låter som att jag får gå på något mellanting såhär i början.
  7. M

    Airfoil selection

    I am doing a little design exercise and I am trying to decide on a suitable airfoil. Most graphs have "standard roughness" data as well as normal data. The standard roughness gives a Clmax of 0.3 to 0.5 less than the normal data. This is obviously quite significant so my question is how rough is...
  8. M

    Bending sheet metal without a break?

    This question regards bending the sheet metal for spars and longerons. Is it possible to substitute using a large break with a wooden mold, basically using the same technique as for wing ribs? Would it be possible to be accurate enough? Cheers
  9. M

    Stress Analysis, Structural Design

    What are your rates? Could you give some price examples for different types of jobs. Cheers
  10. M

    Let's design together!

    I like the midget mustang. Wha would a corvair add to it compared to the usual engine?
  11. M

    Sheet metal competition aerobat

    Ah, very interesting! I did not know that. I guess I will have to give up my quest for that sheet metal aerobatic aircraft then. What I will need to decide now is how important the process and build methods are vs what the final product will be. I think it is now down to 4 contenders + one wild...
  12. M

    Let's design together!

    Yes I think the O-200 is a very good option for the very reasons you just stated. I am looking at the Jabiru 3300 at the moment.
  13. M

    Sheet metal competition aerobat

    I guess that is a good option. Maybe it is going to be a one design after all! I will have to look at costs for that one though. A Lycoming 360 doesn't come cheap. Are there really no sheet metal competition aerobats out there?
  14. M

    Sheet metal competition aerobat

    I like the Lazer but I will not be able to build the one piece wing in my workshop (garage). My plans is still to start to build as soon as I have decided on the type. I will hopefully be able to spend the dark winter nights building and then next spring I plan to take up my aerobatic training...
  15. M

    Let's design together!

    Thanks Topaz. That looks like a good thread to read.
  16. M

    Let's design together!

    Very good points there Dave, thanks! You are right and will edit the requirements to suit the inexperienced. I guess this is still just a bit of fun and a very long way from actually turning in to a serious project that will be built, but who knows - it would be very exciting if it did! This is...
  17. M

    Let's design together!

    A couple of good ideas here! Combining both pop and standard rivets sounds like a very good solution. Converting a KR1 is also a good idea which of course can be applied to several other similar designs. New wings and a larger tail on a midget mustang could perhaps also be an option. But for...
  18. M

    Let's design together!

    Given how many talented and knowledgeable people there are here at this forum I thought it would be a good idea to combine our forces. I therefore think it would be a fun little exercise to try to design an aircraft together –online.:ban: I have used my own ”dream homebuilt”to specify the...
  19. M

    Sheet metal competition aerobat

    Yup, def need an inverted system and I have pretty much decided to stay away from the VW engines. If I build the Kestrel I would power it with a Jabiru 3300 - supported in the plans and would give a decent power to weight ratio. I would guess you are right about a flat bottom profile on the...
  20. M

    Sheet metal competition aerobat

    I have looked at the midget mustang and it is a very cool little aircraft that ticks most of the boxes. However, Mustang aeronautics say on their webpage that is is not very good for competition as it it too fast and slippery so it would struggle to stay within the box and would accelerate too...
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