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  1. W

    Yummy weather forecast web

    I forgot to share it when I discovered it. Notice you can sort wind speed for flight levels. https://www.windyty.com/ Enjoy.
  2. W

    Joined wing glider

    Following a suggestion from Proppastie in this thread https://www.homebuiltairplanes.com/forums/hangar-flying/22300-hang-glide-deltaplane.html I found this website with interesting designs: Joined wing explorations and confirmations There is also a very interesting thesis...
  3. W

    Some interesting papers on aerodynamics and helicopters

    I think they are worth of reading but couldn't find the right 'shelf' to post it. Homepage: Helmut Sobieczky This one for the helo folks. FM 1-514 Chptr 1 - Principles of Helicopter Flight FM 1-514 Chptr 2 - Fundamentals of Rotors FM 1-514 Chptr 3 - Rotor System Operation FM 1-514 Chptr 4 -...
  4. W

    Basic Aerodynamics for newbies (like me)

    Well, not sure if this the correct area but here you are: http://www.kiae.org/wdc/KIAE_KWDC_Aerodynamics_Appendix_v20110118.pdf
  5. W

    OPOC linear generators for hybrid setup

    Just read about the new Rolls Royce engines efficiency and read a comment by JamesG: "Fuel efficient and jet engine should never be combined in the same sentence", that suprised me. Are not these the most efficent combustion engines can be used? I wondered. Indeed 2 st marine engines are, I...
  6. W

    Dry sump oil pans for auto conversions?

    I've just found this website: Dry Sump Oil Pans, may someone find it of interest. These seems to be a lighter option but surely pricey and somewhat unrealible (?) due to their belt driven oil pump.
  7. W

    Understanding Reynolds Number

    I found this video quite interesting to share. Their channel is well worth a look too.
  8. W

    One hundred miles per gallon

    By Dave Hirschman Pilots usually think of airplane flight performance in terms of gallons an hour—not miles per gallon. AOPA member and aeronautical innovator Klaus Savier, owner of Light Speed Engineering based at Santa Paula Airport (SZP) in Southern California, has been setting speed...
  9. W

    Interesting link: INTRINSICALLY-SMART COUPLED BOX BEAMS

    SMART MATERIALS: Intrinsically Smart Composite Structures
  10. W

    Templates tool

    Hi there. I finally managed to get a 1/4 scale model of the fuselage shape I want. And now the task is transfering the cutaway templates to paper and then the real ones. Easy. NOT!. I figured two options. The first one was to have some epoxy impregnated cotton cord over a tin foil strip over...
  11. W

    Inox turnbuckles

    I have some inox turnbuckles I won't use. These are 17 inox polished 14 mm barrel (0.551 in.) unused, 13 10 mm barrel (0378 in.), 6 used (have some plier notches in the neck of the barrel). They seem to be AFNOR 33-372 marine AISI 316 inox steel. Forks are welded, some 10 mm are milled. 10mm...
  12. W

    Pivoting wing, section drag reduction

    These designs come pretty unstable therefore needing artificial stability. But I saw this picture coming from this web page: ch8-2 Couldn't this concept be applied to homebuilt aircrafts?. I mean a much wider and flat long fuselage like a Burnelli could solve or ease those stability...
  13. W

    Area rule

    I was wondering if at a 100/150 kts speed there would be any benefit of shaping a waist in a low wing monoplane to comply with the Area rule. Is it worth the effort?. I remembered the AR 6 has something like this and now I see if it is not what we know as a waist (depression), it seems to have...
  14. W

    Citroen 3cv aero-engine

    I've found what seems to be a citroen 3 cv conversion that looks interesting. The aeroengine site is only in spanish and reads 'soon to be released' but there is plenty more information of their automotive line in english. They claim a weight around 50 Kg and a TBO (?) of 500h. SAVOIA CARS...
  15. W

    Eppler 393/ Davis DA 11 question

    I've thought this airfoil could work nicely in a DA 11 alike aircraft. Aspect ratio 5.3, rectangular planform, no tip wash-out, 11 lbs/sqft and around 35 hp. Could we expect a nasty behaviour at stall with a 28% C.o.G. setting?. Thank you.
  16. W

    Interesting source

    Hi all. I've found a site you may find useful. If not or double posted, please delete this post. aerodynamics4students: Table of Contents Cheers.
  17. W

    Hombebuilt B-29/Stratocruiser

    I’ve been thinking if the engine I have could propel a downsized b-29. I mean, we have a 35 hp 4st direct driving a 48” propeller giving about 110 Kg (242lbs) static trhust I guess. Let’s have an airframe with 6.8m (22.3ft) wingspan. 43 sqft (4sqm) wing area. Aspect ratio 11.35. MTOW 250 Kg (...
  18. W

    Glad to be here

    This forum is the best source of information I could imagine. Here I've read about things I thought few people would care about, but they are here (you). :ban: So, eager to learn and discover, if I can drop some useful lines too I would. Regards, George
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