Fauvel AV-36 and 361 plans project

Discussion in 'Member Project Logs' started by Hot Wings, Jul 7, 2019.

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  1. Jul 7, 2019 #1

    Hot Wings

    Hot Wings

    Hot Wings

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    This is not a traditional aircraft build, at least not yet. I have taken on the responsibility for the AV-36 after purchasing Falconair's rights to the design. After receiving the documentation It became apparent the the plans needed some significant updating. The 'master' plans showed their age due to the wear and tear of being used to copy them for each set of plans sold. They were never converted to digital format. Some of the masters are even negatives - white lines on black background. I've had the plans scanned locally so that i have a digital set to work with while redrawing the plans into CAD specifically Solidworks.

    This will/should result is a set of plans that are accurate and much easier to read. In addition 3D pdf files can be generated which should aid int visualizing what is being built.

    Obviously the CAD files won't be posted but I hope to post various screen shots and links to 3d PDF files as I am able to find time to work on this project. I'd post the 3D PDF files here, but they are generally pretty big and I see no reason to fill up HBA's server with large files that are likely to be of interest to only a few of our members.

    A sample of the original plans:
    HBA fuselage.jpg

    And the CAD rendering of the part:

    Frame 2.jpg

    Link to comment thread:
    https://www.homebuiltairplanes.com/forums/threads/fauvel-av-36-and-361-project.31891/
     
    Last edited: Jul 7, 2019
  2. Jul 8, 2019 #2

    addicted2climbing

    addicted2climbing

    addicted2climbing

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    Hello Hotwings
    Cool project. I am doing the same with the Raceair Skylite. I started a build thread seperateky from a discussion thread to chronicle the progression from plans to subassemblies in Solidworks. Best of luck on this and will be following for sure.

    Marc
     
  3. Jul 18, 2019 #3

    Hot Wings

    Hot Wings

    Hot Wings

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    CAD computer smoked a power plug on one of the hard drives. Fortunately the hard drive survived. This is the second time a cheap SATA/Molex adapter has internally shorted. I'm now out of adapters....but I do keep a spare power supply at all times.

    Just a couple of screen shots to add. Finally got the wing loft correct so I can now begin to carve out the individual parts. The original airfoil nose profile is made up of 2 radius. This works fine for a hand build wooden wing but CAD revealed a nasty little bump in the lower surface that really messed up things when put into JavaFoil. Smoothing things up with a hand generated spline improved things in JavaFoil extremely well. Variation from the original nose arcs is less than 1/3mm.

    Just for fun I tried to see how a wing fold at the end of the airbrakes would work. This could make the AV-361 as compact on a trailer as the Pelican flying wing. It would also add complexity and will have to wait until I have the plans ready for printing with no modifications.
    Wing basic loft - Fauvel smoothed nose.JPG Wing fold.JPG
     
    Last edited: Jul 18, 2019
    FritzW likes this.
  4. Jul 19, 2019 #4

    Hot Wings

    Hot Wings

    Hot Wings

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    Today's work partial spar.JPG I'm thinking a composite AV-48 would be SO much easier and quicker to build.
     
  5. Jul 19, 2019 #5

    addicted2climbing

    addicted2climbing

    addicted2climbing

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    Wow Looks great. Been more than a week and the thread mentions both the AV36 and Pelican and Victor Bravo has not chimed in yet... :)

    Have you read the little yellow book by Marske yet? He mentions sarting with the airfoils from the AV36 in the beginning and diverging toward his own for various reasons. He is very approachable and you may reach out to him as to why? Also he was working on a followup to the yellow book, so may have some pertinent info you could use.
     
  6. Jul 19, 2019 #6

    Hot Wings

    Hot Wings

    Hot Wings

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    The Yellow Book is unknown to me. I'll have to do some searching. Thanks for the lead.

    I'm pretty sure that there are better airfoils than the Fauvel, after all 40% of the underside is flat! But when I put it into JavaFoil I was VERY surprised by the numbers. My other objective with this project is to simply reproduce the original plans as faithfully as possible rather than "improve the design" them at this stage. Having plans to a proven airframe is one of the reasons I bought the rights from Falconair.

    Later when I have the time to build my own I'll build it with some of my ideas to improve the build time and reduce the cost. It will be an AV-45ish fuselage and an AV-361 wing. I intend to follow Fauvel's lead and keep things modular so an existing AV-36 wing can easily be grafted to an AV-361 or AV-45 fuselage.

    One interesting bit of trivia that has emerged from the CAD work is that the AV is not a plank. Due to the fact that Fauvel used 30% chord for the datum it has .72 degrees of sweep about the 25% chord.
     
  7. Jul 19, 2019 #7

    addicted2climbing

    addicted2climbing

    addicted2climbing

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    Hotwings, I just realized I commented on your build log. You might want to make it private to avoid that. Sorry for the error...
     
  8. Jul 19, 2019 #8

    Hot Wings

    Hot Wings

    Hot Wings

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    It was really private for a while. Even I couldn't post. It started out as private but admin has been working on the software. I'll have to see what is involved in returning it to private.

    Who knows maybe it will work out better this way?
     

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