Rutan Catbird

Discussion in 'Aircraft Design / Aerodynamics / New Technology' started by Rik-, Sep 21, 2019.

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  1. Sep 24, 2019 #81

    TFF

    TFF

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    For as short as a Reno race is a ten hour TBO race engine is all that is needed each year. If development was cut to go racing, that’s shooting a hole in your foot with a shotgun. Problems could have been solved. Probably would have.
     
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  2. Sep 24, 2019 #82

    Rik-

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  3. Sep 24, 2019 #83

    Rik-

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    What is it that everyone is saying about that guy with the overgrown velocity and an Audi motor? Pick one and perfect it as you can’t develop both at the same time..
     
  4. Sep 24, 2019 #84

    TFF

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    Yes but one is a race plane so blowing up engines is part of the fun. Passenger plane replacing reliability for gimmicks is completely different. The Pond Racer scared the Unlimiteds enough to outlaw the type. Of course that has killed Unlimited class today.
     
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  5. Sep 24, 2019 #85

    Hephaestus

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    Sponsorship agreements, tens of thousands in insurance & logistics costs for the team to be there...

    It had flown the year before at the races, from the businesses side, Mr pond and rutan were both in bad position...
     
  6. Sep 24, 2019 #86

    Speedboat100

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    That is right....only way to reach 400-500 mph realm would be a twin 780s or alike ( as Merlins are way too scarce and expensive ).
     
  7. Sep 28, 2019 #87

    ScaleBirdsPaul

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    I’ve been quietly sketching an idea that been in my mind for a while that is sort of a hybrid between a Quickie and the Catbird. Essentially a three surface taildragger. The reason for this configuration was that I wanted an airplane that I could enter and exit like a car without ducking my head or climbing on a wing. I’m a big guy, so I wanted to make a comfortable cabin without an enormous fuselage. I moved the spar into a shoulder wing config behind the pilots seat. The canard was obviously to counter the larger nose down pitching moment. Once the canard was there, why not add the Quickie type landing gear? Since it’s not a true tandem the canard span is roughly the track of a traditional taildragger main gear.

    I haven’t really presented it because I’m not sure how best to tackle pitch control. My first thought was to use only the horizontal stab, but I’m not sure I could convince myself that dee stall wouldn’t be a problem, even if the canard was designed to stall first. Once I get some work done I’ll see if I’m brave enough to open it up to the community.
     
  8. Sep 28, 2019 #88

    Rik-

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    Sounds like a good idea.
     
  9. Sep 28, 2019 #89

    bmcj

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    Three surface design can be tricky. Make sure you do your homework.
     
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  10. Sep 28, 2019 #90

    ScaleBirdsPaul

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    Absolutely, which is why its pretty much remained a study for so long. In terms of understanding the aerodynamics, I tried to solve for upwash and downwash on three surfaces simultaneously, as well as treating as an extremely negatively staggered biplane but I wasn't really satisfied with either result. It would need some real CFD to optimize correctly, so for now it will probably remain a study. The discussion on the Catbird re-sparked my interest though, I might have to do some more research into Catbird design.
     
  11. Sep 28, 2019 #91

    narfi

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    These guys put a 3rd surface on a 182,
    http://www.katmai-kenai.com/

    There is a guy on this forum who was putting a 3rd surface on his quickie.

    Piageo made a fat fuselage with three surfaces go fast.

    I have always been curious about 'automotove' ease of entrance as well. The Velocity seems to do it with their gull wing doors.
    Share your rough sketches, it sounds interesting. A cross between a 1.5place plane and a 4.5 place plane leaves a bit of room for interpretation though :p
     
  12. Sep 28, 2019 #92

    TFF

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    On the cover of SA for October, with some other Rutan planes.
     
  13. Sep 28, 2019 #93

    plncraze

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    Victor Bravo is based at M2's airport so when he talks about that plane that can be considered a good source.
     

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