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  1. malte

    A solution looking for a problem

    You realise, you just did exactly that? It is more a question how exactly things are built and how high the mass penalty ist. FRP can be designed extremely light. On most aircraft not strength but buckling / stiffness is the main driver of mass with FRP, and, of course, process steps...
  2. malte

    10/23 Raptor Video

    If ICON builds 40 aircraft per year with 200+ people and has one LSA "certified. Alexander Schleicher builds 100 aircraft with 100 people per year and has a current choice of 15 Models/Versions with 10 powered gliders among them, two of which are electric and 4 of the models having their first...
  3. malte

    spec list of efficient light planes

    I think the Gramex Song is missing in your list. The engine is said to have 20 hp and the aircraft cruises with 110 km/h. SONG :: Ultralight airplane SONG
  4. malte

    10/23 Raptor Video

    I am not an expert, but I'll give it a try anyway. So please correct me, if I am wrong. No way this is due to propwash or any other aerodynamic "shocks" to set the camera in motion this way. Take a look at the streamlines of propellers: You do not have a radial aerodynamic component...
  5. malte

    spec list of efficient light planes

    There are also the Jodel D9 Bébé and the Druine D.31 Turbulent.
  6. malte

    Pitot test / calibration tool (on a budget)

    Hi Folks, we all know that pitot-static testers are expensive pieces of test equipment. As explained in the "What did you do to save General Aviation" Thread, I am writing technical articles for AOPA Germany. In the issue 01/21, I discussed a pitot calibration and test tool with parts from...
  7. malte

    10/23 Raptor Video

    Well, if Peter flies with that engine and delrin collar, he might get an emergency rate of 2 per airframe faster than he'll like.
  8. malte

    replica's other than p-51 p-40

    In case you have missed it, Avions MArcel Jurca has a new website (updated some time last year I think). Home M. Jurca was famous not only for this Tempête (the poor mans fighter), but also for his plans for the P-51, FW-190 and Spitfire - in full scale and scaled down versions.
  9. malte

    10/23 Raptor Video

    Perhaps, like on European microlights, the problem then is transferred from the manufacturer to the customer. If I compare the state of the Raptor to our already-well-prepared customers in certification and the amount of changes we still need to perform, I'd say that starting from scratch is...
  10. malte

    What did you do on your airplane project today?

    Actually it wasn't oil but a hard wax seal HWS-112.
  11. malte

    10/23 Raptor Video

    Haha yeah, by tossing out the complete airframe and starting from scratch, keeping just the TLAR: High altitude cruising, pressurised, fat duck comfy canard.
  12. malte

    Flying illegally!

    Where in Europe? Unlike the US, Europe is far from harmonised in Law. Also, since microlights are regulated nationally, it makes a big difference if you are located in Germany, the Netherlands, Sweden, Denmark, Poland, Slowakia, Italy, Austria....
  13. malte

    10/23 Raptor Video

    So does listening to experts advice (especially if they come from verified experts and are for free, as here on HBA. What the actual f...reak is he thinking? On the video: I, too, did not recall the transient vibration of the wings while revving up the engine. This can have two main...
  14. malte

    Ground vibration testing

    what he said ... Just to get a feel for the frequencies, you can find the first Eigenfrequency of a beam without any excitation. If you have a cantilever beam, you measure the translation \( w_{max} \) at the free end of the beam (that is the maximum elongation of the static bending line of...
  15. malte

    Ground vibration testing

    How and where is the beam hinged?
  16. malte

    Dynamic Soaring Blows My Mind

    A note on the history of dynamic soaring: I stumbled across an old booklet "Handbuch für dne Jungsegelflieger" (Manual for the young glider pilot) by Stamer and Lippisch, printed 1930. In the glossary "Alphabetisches Verzeichnis besonders in Gleit- und Segelflug häufig vorkommender Fachausdrücke...
  17. malte

    STOL Amphibious Aircraft Using Ground Effect

    That is correct, many amphibs use open wells where possible (i.e. in the wings or if the main gear is not part of the floating structure). The Lake, also has a considerable gap at the nose wheel door. It is tightened towards the floating compartments to the left and right of the nose gear...
  18. malte

    STOL Amphibious Aircraft Using Ground Effect

    Wow, interesting concept. I can't wait to see tank tests / model tests.
  19. malte

    STOL Amphibious Aircraft Using Ground Effect

    (The hover skirts did work, but are bulky and heavy, so they have serious disadvantages). I beg to differ on the hydrofoils. The Tests with the Buccaneer on hydrofoils gave an instant doubling of bearable wave height during rough water procedures. It is true, that NACA did not get it right...
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