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  1. S

    Composide now with freemium

    https://composide.com/subscriptions/ Asked for this few years back - now they have it. Be aware - registration does take few days. It is done manually, after forms is submitted.
  2. S

    500 Wh/kg

    So we are here at last. https://insideevs.com/news/659256/verified-amprius-500whkg-battery-cell/ And it is not another will-be-mass-produced-someday-experimental-stuff, they are launching production now.. So - i did run numbers on a napkin for an tesla powertrain in a Rutan boomerang...
  3. S

    Diesel direct drive and flat

    There is more than one succesful conversion of vw boxer. And more than one failure. Yes, they need to be reved past 3000 rpm for good power, they tend to weight more. But - a nice dv6, used in gazaile weight 107 kg per 100 hp of useable power. Beeing 30% more fuel efficient - for any longer...
  4. S

    Analysis of Wing Tip Design

    Some graphs. Угол атаки - aoa. К качество - glide ratio. Wing have 1m chord, 6.6 span.
  5. S

    The difference between winglets and higher a/r

    Simple question. Two planforms. One - square wing, area 8m2 1m chord with winglets, and other one is 9 m2, but 20% of span is tapered. Like Strojnik wings or w10 Tailwind. Total weigh or area is similar. But - will wing with winglets will be less sensite to air turbulences ? And be more...
  6. S

    Airframe from non-aircraft grade material.

    I was / i am in a search for that ideal technology for one-off aircraft. To have a nice shape, low air-drag and safety. I was stumbled by this one design. Ok, wings are not that i would like to copy, but fuselage is interesting combination of welded tube fuselage with non-load bearing panels...
  7. S

    Aviator house (Flat pack unfolding house)

    Some funny facts now are happening. I do live ~50 km from Belorussian border. One of my side hobby - is power producing Stirling engines for autonomous living. I do build some small models in past, but it is hard to make one for some power and being build-able by average men. After huge increase...
  8. S

    Low wing examples in metal tubes

    Hello. In a next insanity move i want to compare rag and tube fuselage with composite non-load bearing shell to fully composite. But for a low wing one. Could others share photos/drawings of frames with weight and basic aircraft data.. Of course only two/four seaters. Reason for all this -...
  9. S

    Wet pregs

    I used and like to make my own "wet pregs" on 90% of mold jobs. Its just dammn too easy to wet all fiber on flat table. But if you go to some bigger one sizes, you need more mens skilled in composites, or nice and big rollers. This one here is maximum size which one could achieve as per size...
  10. S

    Diesel vs miller cycle

    Long story short. Diesels achieve~ 230-240 g/kw*hr bsfc in broad load range, where gasoline could achieve 300-330 g/kw*hr bsfc, in a narrower one. Where Prius engine could get it same or better as diesel. Or like this one : First and second generation Prius (Atkinson cycle) - 37% thermal...
  11. S

    Head wing cantilever.

    Spin off from shoulder wing / cantilever high wing two seater. This one airplane : CZAW Parrot - Wikipedia Puts pilots head in front of main spar. Price for this - forward swept wing. Do other know similar designs ? I really do not see any other possible option to have perfect visibility...
  12. S

    Panel wing / new bd4 wing /Skin for two tube spar wing

    I am in a need for public brainstorming. While waiting for some tube form manufacturer and ways how to make sky-ranger oficially more friendly for bigger boys: ( Boy in black jascket is ok, just need some U cut in his head. But the one with yellow boots need more space really. ) I do got...
  13. S

    Cantilever high wing examples

    Waiting for as many as possible cantilevered high wing structural examples.. It looks like kind of tough one example - on front of fuselage you must have a window, on side - doors. And all load must pass through some small members.. One is sky pup like : Other is bd4: And none have X...
  14. S

    Control surfaces chord percentage

    Just for better understanding. I do come to this question from this pdf : contrails.free.fr/temp/Pilot100Yrs-06-164.pdf Smilar approach was done on Blanik ~ also on 40% of used chord. Books do suggest as general rule 20-25 %. So the question is simple one. Taking same wing, with same area...
  15. S

    Fuselage tail section Angle

    Did find a nice "rule of thumb" on fuselage additional drag created due to central angle/attack angle not being equal. Think of Ch701 / kitfox / skyranger etc.. And tailwind and all derivatives.
  16. S

    Workbench question

    Hi all. I am in a middle of building workbench from two plywood sheets 4 x 8 foot / 1.25x2.5m. + aluminium square tubes 100x20mm for stringers. I need it in this side for foam mold positioning/ wing assembly. flat composite impregnation etc. But - i can build it as two separated, for easy...
  17. S

    Metal skin for ultralight wing

    Just read this article : https://generalaviationnews.com/2018/05/24/belite-adds-metal-wing-option-of-chipper-cuts-build-time/ WICHITA – The Chipper STOL, a two-place experimental amateur-built aircraft kit from Belite Enterprises, now has a metal wing option for $1,320 and 15 extra pounds...
  18. S

    Rusty hardware

    I am in the process of rebuilding, Skyranger after crash, I am ok on how to grade tubes - if all holes are nice, and tube is not dent, but how questions on hardware. Then bolt is too rusty to use ? Left to right - not for reuse, bent all corroded, some rust on thread and perfectly usable ...
  19. S

    Standart airframe loads

    Hi ! As i did mentioned before - i am "toying" with composide software. Firstly - to anwer my self of some composite design questions - most of them in style of do we on tail section of fuselage more tahn three layers of fibre (minimum to handle "pencil load at hangar") and at which...
  20. S

    Purrpose of short struts

    I try to reinwent excel files for primary wing calculations, and explain it for myself. All was ok for strut less wing till i did stuck to draw proper spar cap load, if struts are placed not in middle of wing lift point. But not pk for different position. As an.example. 10m wingspan, square...
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