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  1. Z

    Interest in reprints of Rohr 2-175 Fanjet book by Richard Fraser

    Hi All, I have been in contact with the author of the book on the Rohr Fanjet. Unfortunately the book is out of print however if there are enough orders he is willing to get a small print run done. The 164 page paperback book (with colour) contains information on the design, development and...
  2. Z

    Looking at a Rans S-19

    I've finally decided to go ahead with a kit purchase and have decided that the Rans S-19 fits the bill. I've hunted through the usual forums for comment but would be interested if anyone has anything good/bad to say about these aircraft/kits. All the owners sites a fairly positive (as you...
  3. Z

    Propwash on T-tails

    Something I've been looking into as I have been rechecking my assumptions behind my static margin calcs for different flight regimes... one of the benefits of T-tails is that the tail operates out of the propwash at cruise. Several references I've looked at dont distinguish between...
  4. Z

    Leading edge flaps - Why not?

    Looking at an alternative configurations (like a twin pusher) leading edge (droop) flaps makes some sense, as the trailing edge flaps are broken by the nacelles. TOWS mentions lift increments of 0.7 however Orion has stated less. Can anyone provide any references, experience regarding actual...
  5. Z

    Drag coefficient for a half sphere on a plate?

    Does anyone know the whereabouts of data for the CD of half sphere on a plate?
  6. Z

    Yaw stabilizing a tail dragger idea (during landing)

    Just throwing an idea out there. Having no taildragger time and being healthy anxious about flying them... I was wondering if anyone has ever implemented a system to control yaw during the landing roll. The ways I was thinking off the top of my head were: -active: i.e. gyro stabilized or...
  7. Z

    Looking at a Quikie Q2?

    I've always been a bit partial to the Quickie and one has turned up for sale. I'm not giving up on my design but thought it would be good to get some hands on while I'm at it... The Quickie forums has a lot of information and I was wondering if anyone else here has suggestions about what else...
  8. Z

    Propeller moment parameters? accuracy query

    I'm running through the yaw stability calculations (still... if only I had more time!) and calculating the propeller yaw and normal moment coefficients. Obviously there are a lot of educated guesses which are made around the propeller that will actually be installed as small propeller...
  9. Z

    Traffic advisory/Collision avoidance systems - how much would you pay?

    I have an idea for a low cost air traffic advisory/collision system. I was curious what people would be willing to pay for a system which advises of traffic in the area providing bearing and distance. Pricing would be based on a subscription service?
  10. Z

    Determining the rudder effectiveness parameter

    I'm currently calculating the stability for my design to size the vertical tail however my resources mention the rudder effectiveness (epsilon sub r or K' in some texts). The texts dont however mention how to estimate/calculate it? Can anyone suggest how this is done, or where a good...
  11. Z

    Wing Taper - rationale

    I was hoping I could promote some discussion on the topic of wing taper. My design currently uses a taper ratio of 0.6 and I am curious why you dont see more of it in other designs? The way I see it is Pros: Increased efficiency and better looks Cons: Tip stall and increased wing structure...
  12. Z

    Pitch stability analysis, constant definition?

    I'm running the the stability calculations again for my design starting from the beginning using the Mechanics of Flight text by Phillips. I must have been staring at it for too long or maybe its the time :tired: but for the life of me I cant figure out where he is getting the constant C...
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