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  1. rv6ejguy

    Roussel 30. French Lightweight Fighter

    The engine installation performed better than expected with rated power being achieved a couple thousand feet higher than predicted due to the intake design apparently- from Williams Green's account.. If we compare to the Radial Rocket, a similarly sized aircraft, though quite a bit lighter...
  2. rv6ejguy

    Beta Technologies Alia

    Finally did the transition flight: Great milestone
  3. rv6ejguy

    Roussel 30. French Lightweight Fighter

    High ROC and high power to weight ratio is a huge advantage in a dogfight, allowing you to dictate terms and disengage as they say. The Zero was a good example, literally running rings around most allied designs for the first couple years of the war, having almost double the ROC, a much tighter...
  4. rv6ejguy

    Roussel 30. French Lightweight Fighter

    Weight creep destroyed the performance of many good fighter designs, demanding more and more power to compensate. This was an exercise in what could be achieved with attention to weight management. It would have needed some armor protection for the pilot at least but had 110 more hp in the...
  5. rv6ejguy

    Roussel 30. French Lightweight Fighter

    Most of the campaigns I mentioned were initially at least, desperate defensive actions where ROC and turning radius were very important. It would seem with 800hp, the ROC of this fighter would have been around 4500 ft./min. Pretty impressive and useful for interceptions where warning time was...
  6. rv6ejguy

    Switching Options of Essential Equipment

    Heavy duty or ganged switches don't need power to operate. That could be an advantage over contactors and relays for some purposes.
  7. rv6ejguy

    Roussel 30. French Lightweight Fighter

    As air superiority tools, seems like they'd have been the ticket. Turn the tide and then let the heavier fighter bombers take over the rest. Seems like they'd have been useful in the Battle of France, Britain, Malta, Far East and desert where the allies were pretty short on decent fighters from...
  8. rv6ejguy

    Roussel 30. French Lightweight Fighter

    I've always been interested in WW2 lightweight fighter designs and not sure why none ever made an impact. Seems like they'd be quicker to build, use less materials and be harder to see and hit in combat. Performance seemed nearly on par or better than many contemporary heavier fighters, at least...
  9. rv6ejguy

    Switching Options of Essential Equipment

    I should mention that properly sized and heat sunk diodes are generally pretty darned reliable devices but when we start talking about what ifs and fault tree analysis, everything should be considered. What failures we've seen most often are simple alternator failures where they stop charging...
  10. rv6ejguy

    Switching Options of Essential Equipment

    A most important point and exactly what my partner Barry told a guy a couple weeks ago on the phone. You may not know a diode has failed long ago. Barry has about 40 years experience in electronics repair, design and software. Seen lots of of things fail in that time. Our advice is guided a lot...
  11. rv6ejguy

    Switching Options of Essential Equipment

    Agreed. I'm an advocate of KISS and eliminating bits you don't really need.
  12. rv6ejguy

    Switching Options of Essential Equipment

    Some good discussion here showing some careful thought going into electrical system design. Thought I'd mention a couple more things on diodes. Be aware that you have a voltage drop of around .7V for a normal diode and around .2V for a Schottky. Because of this, there are power dissipation...
  13. rv6ejguy

    Switching Options of Essential Equipment

    I just want to make one point on diodes. When they fail, 95% of the time they short and therefore become a wire. If that's your form of isolation between power sources or buses, it's no longer isolated. A failure on one may bring down both. Switches are a better way to isolate in our...
  14. rv6ejguy

    Van's Aircraft Laser Cut Hole Fatigue Analysis

    Paul R, do you know the flight history of this Rocket? Was it being horsed around well above Va for some time prior to the failure?
  15. rv6ejguy

    Van's Aircraft Laser Cut Hole Fatigue Analysis

    Post #21.
  16. rv6ejguy

    Van's Aircraft Laser Cut Hole Fatigue Analysis

    They were lucky on this one! RV stab spars have often been the first thing to fail when overloaded at high speeds. I can think of at least 3 accidents in this regard. Light control forces and high speeds can often get you into a dangerous structural loading situation. Rough air at high speeds...
  17. rv6ejguy

    Van's Aircraft Laser Cut Hole Fatigue Analysis

    Fortunately Van's normally had some of the highest time airframes they used for testing and demos so they were often (though not always) the first to find cracks in various areas, issue a SB and offer a fix for it. Outside of early RV3 wing failures, most other cracking has been slowly...
  18. rv6ejguy

    Van's Aircraft Laser Cut Hole Fatigue Analysis

    Many cracking parts on RVs have been systemic long before the LCP fiasco and had nothing to do with fabrication errors. There have been multiple SBs issued across almost all models over the years to warn and address these. The structure was clearly a bit light in certain areas. A number of...
  19. rv6ejguy

    B-29 Replica Takes Shape

    Shortened the blades and has done some gear mods as well, though mainly with the retraction system as I understand it. He talked to some CAF guys operating Fifi and they only have around 6-8 inches of prop clearance on that- having to be very mindful with even moderately sloped surfaces during...
  20. rv6ejguy

    Van's Aircraft Laser Cut Hole Fatigue Analysis

    None that I saw and also no vibration considerations which is a bigger concern to me.
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