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  1. R

    Lift theories

    Does lift need viscosity?Great webinar on lift in super fluids, IOW you don't need viscosity to generate lift. Also in the middle of the talk a great description/review/explanation of lift generation in normal conditions.
  2. R

    Unusual biplane bracing

    Does anyone know of a biplane that was braced in this fashion ? Thanks for any pointers.
  3. R

    Pop Quiz 2: Pitch stability and airfoil pitching moments

    Continuing on the pop quiz on stability. Assume all else is unchanged: CG location, wing areas tail etc. Does changing airfoil pitching moment change pitch stability ?
  4. R

    Pop quiz : tail incidence and stability

    Thought I would do a quick pop quiz....Assume an existing design that you modify by changing the tail incidence.
  5. R

    Some Common Myths on Airplane Pitch Stability

    A few recent threads relating to tails and stability brought to the forefront many common misunderstandings of what actually makes an airplane stable in pitch. Feel free to add or question.... All the below statements are untrue but commonly believed 1. The (horizontal) tail must carry a...
  6. R

    Units in Design

    The US of course still does a significant portion of its airplane design in FPS/US customary units and all my design texts/references by US authors use this system. I noticed of the two texts I have by European authors (Chris Heinz and Vittorio Pano) are in MKS (or MKFS) system which uses...
  7. R

    Wanted Sky Pup Plans

    ...maybe you should change your name to wantodesign :)...while it can definitely be done its a lot more involved than just adding some carbon bid to the spar web. Almost anything can be engineered, but the question is what is the trade off. I don't want to dissuade you (its experimental...
  8. R

    Composite design

    I am reasonably well versed in analyzing wood and Aluminum aircraft structures. I have decided to try my hand at composite analysis now. The math is fine as I have advanced degrees in (non aero) engineering. However I would like to validate my approach with folks that have actually analyzed...
  9. R

    Mignet and top speed

    I have always been a closet Mignet fan. Yes, I am well aware, the point of these formulaic aircraft is not top speed. But, apart from the drag of the extra wing area and pivots etc, is there a fundamental reason that they are limited to a lower speed? I have noticed the dutch roll gets worse...
  10. R

    VP-1 control throws

    Can anyone tell me what the control range (angle of the flying surface) for the stabilator and rudder for the VP1 are? Thanks!
  11. R

    My flying motorcycle type design

    I have been tinkering with different layouts for a very simple (yeah I know thats how they all start) airplane in the flying motor cycle genre that Matthew has talked about in another thread. Simplicity has meant using single cantilevered beams (for spar and keel) using square tube 4"x4" 0.125"...
  12. R

    Stabilator without anti-servo design

    For reasons of simplicity I am contemplating a stabilator without an anti-servo tab. The stabilator will pivot about the quarter chord point. All the stick forces and trimming will be provided solely by bungee chord attached to stick. I am aware the cri-cri incorporates such a scheme; any other...
  13. R

    Tandem wing with elevons on rear wing

    I have been working on a conceptual design of a tandem wing. It appears with full span elevators (25% of chord) on the rear wing there appears to be enough control authority in pitch but also enough left for roll control using asymmetric deflection -i.e elevons. Are there tandem wings that use...
  14. R

    Ultimate loads compression in aluminium

    Is it typically the case for open sections (angle zstringer etc)at ultimate load (say in bending) the compression allowable is at best the yield stress (lower if crippling failurure is an issue) in the case of aluminium structures? In other words, the ultimate compression stress is not used at...
  15. R

    Semi tension webs plywood

    I am hoping some of the more knowledgeable folks can help me with this. I am analyzing the sides and top/bottom of a plywood box type fuselage. During combined loading (full rudder and elevator) the sides buckle due to the combined compression due to the lateral bending of the fuselage by the...
  16. R

    Plywood Box Fuselage analysis

    I am trying to work out the allowable longerons loads on a four longeron plywood box type fuselage. There are no diagonals just 4- longerons, verticals (spaced every 25 inch or so), and a plywood shear web. Can one assume that the longerons can take nearly their ultimate compression load...
  17. R

    Foam/Plywood wings

    It appears to me that the classic Rutan type foam and glass wings have never lived up to the expectation of short build times. While the part count is low and it is quick to get the basic wing done, final finishing (sanding/filling) takes a lot of time. I have always wondered why plywood is...
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