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  1. R

    All open source design program

    A 3D CAD/CAE open source software: FreeCAD: An Open Source parametric 3D CAD modeler It's like Solidworks, not quite there yet, but is usable and definitely a promising software.
  2. R

    What about a Turbo for your little twin vw?

    Fuel injection would be quite unbeatable in a turbocharged engine. That injection system uses atmospheric manifold absolute pressure sensor, so it would be able to handle altitude compensated engine, but not boosted. For boosted engine you'd need a MAP with greater pressure range, and very...
  3. R

    DIY gauges??

    Arduino is an *extremely* easy and fast platfom for development, and the crazy rocket guys in Denmark have made their own ruggerized version which would be more than at home here: CSduino – The Rocket Brain – The multi purpose ruggedized Arduino computer. | Copenhagen Suborbitals ...don't know...
  4. R

    Digital Slip Indicator

    You only need one axis for an electronic slip indicator, to measure lateral acceleration :) Just like the ball does, really.
  5. R

    What about a Turbo for your little twin vw?

    This sounds like an interesting challenge. The smallest mass produced turbo charger is IHI RHB(/RHF)31, which is used for application between 25 and 100 hp; it weighs just under 2 kg (4.2lbs) and fits a box 136mm (5.4") per side. The induction piping would double as the intercooler, with the...
  6. R

    Cutest airplane ever built...

    It is build for a considerable smaller aircraft category than LSA. You can hardly blame the plane for incontinence 112kts at 75% power is significantly less than 120kts at 100%? Seriously? You really have an interesting perspective at reality.
  7. R

    Cutest airplane ever built...

    That looks almost like PIK-10! PIK-10 Paukkulauta | Flickr - Photo Sharing! 1000nm range, 112kn cruise, 35kn stall, spacious cabin.
  8. R

    Cutest airplane ever built...

    Flight Design CTSW is a quite cute chubby little airplane, and very capable too.
  9. R

    New Rotax engine 912iS

    I saw some brochures for the 912iS at an airshow, the cost less taxes in finland was EUR 20k. However, I was surprised to find out the engine is 7 kg heavier than the 912ULS, quite a lot in this weight range (over 10%).
  10. R

    Hardware store aluminium for non-strutural applications?

    The 200MPH figure was for your benefit. A major question is have you've seen a properly welded tank burst, or *a* tank bursting? Hydraulic shock might not be totally out of the question in a fierce crash, but I'd attribute it to a design fault or non-survivable crash, or both. Plain hydrostatic...
  11. R

    Hardware store aluminium for non-strutural applications?

    5052 doesn't harden or soften during the weld process; with proper welding additives, the weld is as strong as the base material, and there's not a brittle/soft HAZ around the bead either. It's got good forming properties, meaning it won't crack easily (but it does work harden). It's relatively...
  12. R

    Hardware store aluminium for non-strutural applications?

    First you show me a fuel tank with several thousand PSI of pressure and then we're talking. The 5052 is structural quality, medium strength, easily weldable, fatigue-resistant aluminium grade.
  13. R

    Hardware store aluminium for non-strutural applications?

    5052 is used in pressure vessels and offshore structures. It's plenty good for an aircraft fuel tank.
  14. R

    changing materials.

    Another somewhat relevant real-life example would be the VL Humu, which was a partial wooden copy of the B-239 Buffalo. The wing (the wooden part) was practically a re-engineered piece designed to fill the silhouette of the original. Saying it wasn't as good as the F2A-1 (as a fighter, anyway)...
  15. R

    22" dome spinner for my FW-190. 24" long.

    ^ what he said, or send RFQ's to metal spinning shop to find one that won't charge you arm and leg for making such a spinner.
  16. R

    Fuel Injection or Carburetion?

    Of the DIY EFI variety, Stingray EFI seems by far the best choice for an aircraft system. It's designed with aviation application in mind from the get-go, and it's designed for proper enclosure too. The link is here: stingray3 Electronic Fuel Injection | Free software downloads at...
  17. R

    Pressurization through means other than bleed air?

    A fan cannot provide pressurization. You'll need a proper compressor.
  18. R

    Rudder Pedals: Hanging Versus Floor Mount

    The throttle pedal on the car is mounted so you can rest your heel on the floor and use ankle for control. Brake and clutch are only needed for occasional, short time use, sometimes with great force and usually not as much precision. The ergonomic solution of the throttle is similar to floor...
  19. R

    Would 3D illustrations on Plans be useful?

    The descriptive geometry (isometric or perspective views) is a concept that greatly predates any CAD application; into 18th century, in fact, so you won't be latching onto some passing fad with it ;) 3D allows to have them for convenience, not just necessity. It reduces the chance of making...
  20. R

    undersquare engine design

    Perhaps some very slight due to individual differences but nothing remarkable. Let's think about engine power; it's torque * rotational speed. The unit of torque in SI is newton meters - which is the joule. No 'but's, 'if's, 'however's and no coincidences. The engine torque is in fact energy...
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