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  1. O

    Blended wing ACs are coming !

    Further to Marc Zeitlin's comments, it was some time ago and memory does get hazy with time, but I seem to recall that the layout had passengers way out on the wing ( to get the required numbers ). Furthermore the critical case was an emergency collision avoidance manoeuvre which could involve...
  2. O

    Blended wing ACs are coming !

    Some ago time I was a visiting examiner for a post graduate course in aircraft design here in the UK. One year the group project was a blended wing airliner very similar to your photo. My objection was exactly the one you highlighted and I do not think there was ever a satisfactory answer that...
  3. O

    Rethinking Propellers?

    I totally agree that NACA 640 is a very useful reference and have had a copy for perhaps 30+ years. I stopped using it because the example propellers employed Clark Y sections and I wished to use something different. However, latterly, I have returned to use it since it makes a parametric...
  4. O

    Rethinking Propellers?

    I was very interested by Mark Zeitlin's post about Paul Lipps propellers. For the final year of my apprenticeship ( the technical office year ) I worked in the DO at what was then the Rotol factory drawing bits for propellers. The three years prior to that were spent getting my hands dirty at...
  5. O

    British air museums?

    There are a number of Aircraft museums in the UK worth visiting. One not mentioned so far is the other RAF Museum at Cosford just off the M54 motorway between Birmingham and Telford. It is a bit out of the way and not sure about public transport but it is FREE. A good complement to Hendon. I...
  6. O

    SDS EFI 30th Anniversary

    Ross, May I add my congratulations on your achievements that include sound engineering and honesty. Increasingly rare qualities.
  7. O

    Dreaming Up the Ultimate Light Fighter Inline

    It was a Bonner engine but it was a 200hp unit called the Bonner Sapphire V 6 and it flew at Farnborough in a modified De Havilland Chipmunk. Bonner were/are an engine development outfit based at Shoreham airfield mainly I think for motor racing. I was under the impression that it was based...
  8. O

    Is there any reason we do not see more energy absorbing / damping type landing gear on experimentals ?

    I think that the British book referred to in post 17 is " Landing Gear Design " by H.G. Conway. Covers a lot of ground even though it was written a long time ago. I seem to remember seeing a copy when I was an apprentice at Dowty Equipment ( they made Undercarriages, Hydraulic stuff etc. ) in...
  9. O

    Fan cooled VW

    Perhaps one of the most notable air cooled engine installations of WW2 was the FW190, where the BMW engine had a crankshaft driven cooling fan. For a time this was one of the fastest fighter aircraft in the sky and was taken as an example of excellent engine installation. It certainly woke up...
  10. O

    Dual plug heads

    Thanks Pops. The picture of the bottom plugs is useful. David.
  11. O

    Stall Spin Resistance, a call to action...

    Stall/Spin resistance and recovery have long been a major element of aircraft design interest for me. This goes back to my early PPL flight training here in the UK. In those days we did have to demonstrate spin entry and recovery in the final check ride, something I was grateful for. It gave me...
  12. O

    Willis JA-3

    Should that be The Screenworld Hollywood Institute of Technology? Just asking.
  13. O

    German Experimental Aircraft of World War II #13

    There is an interesting paper on BSLD aerodynamics from NASA dating from 2016 ( NASA/TP-2016-219072 ), if this has not already been referenced. It appears that Ludwig Prandtl followed his 1922 paper on elliptical lift distribution with a follow on treatise in 1933 which examined a Bell shaped...
  14. O

    VW heads: Single Port vs Dual Port 1600CC heads on the VW factory dyno

    Thanks, But I believe that there has been more than one fan size over the years and I have no data on this. Bob Hoover on his Blog indicated that VW sized the belt drive for 7 bhp. I suspect that was for early engines but it gives a good guide.
  15. O

    VW heads: Single Port vs Dual Port 1600CC heads on the VW factory dyno

    As others have done, I used this data to attempt a first estimate of the power output from a possible 1835cc type 1 engine for my project. I liked it because VW data is reliable with little optimism. Worth noting is the fact that the bhp is quoted as DIN, i.e. it is exactly as in the vehicle...
  16. O

    Dual plug heads

    I am seeking some advice regarding the second plug for type1 cyl. heads. Here in the UK we are obliged to use twin ignition even for recreational aircraft. Whilst the redundant ignition gives welcome safety it has always seemed to me that it also compromises the heat flow in an area of the head...
  17. O

    Lets talk about wood

    Dan, Thanks a lot. I have numerous sets of values for wood properties from UK aircraft industries sources going way back, in some cases, to before WW2. These sources all give different values! Hence my interest in your data. I guess the only sensible treatment is to make some components and test...
  18. O

    Lets talk about wood

    Dan, thanks for the reply. But I am still slightly confused as my copy of ANC 18 gives the tensile strength of .070 birch-birch ply as 8630psi. Like I said old age and Covid brain fog! I have to admit that your results make my design problem much easier. Regards, David.
  19. O

    Lets talk about wood

    Dan, Thanks for the data ref birch ply strips. I have been interested in ply cap strips for foam ribs for my project and it is good to get real measured loads. But I am a little puzzled since 1500/(1 x 1/16 ) I make to imply 24000 psi. tensile stress, which seems way too high for Birch Ply...
  20. O

    Light weight diesel auto conversion

    Puggo1, Hello there. Thanks for the attachment, I was aware of the quill shaft in the red. gear, but surely that is just a torsion spring. OK, this will change the natural frequency but is there any damping? Even then there is still the question of the large number of different installations...
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