Makin" Lil Bitts

Discussion in 'Other Types' started by lakeracer69, Jun 6, 2017.

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  1. Jun 6, 2017 #1

    lakeracer69

    lakeracer69

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    I guess I should start a build thread for some documentation. I am terrible at doing this with many projects I have built. I've had the plans now for maybe 2 1/2 weeks. For those that don't know, Lil Bitts is a standoff scale Pitts, designed and built by Ed Fisher of Raceair Designs. It's a nice little draggy Biplane. It is stressed for utility catagory. I hope Ed will chime in as things progress here. I've flown heavy tailwheel in the past and am looking forward to flying stick and rudder again.

    I plan on powering it with a flywheel forward VW. I'm surprised that the whole VW engine thing hasn't been refined more in the 20 years since I last looked at them for an A/C powerplant. I have a decent machining and fab skillset so that part will be relatively easy. I do need to up my welding game though to make a good product.

    I do have some parts made already and will post pictures as I go. I have ordered all the metal required to build the tailfeathers, wings, and control system. Shipping is ridiculous nowadays, so buy once, cry once, I say.

    6156619_orig.jpg
     
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  2. Jun 6, 2017 #2

    lakeracer69

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    Firewall, I had this .020 304 left over from another ill fated project 25 years ago. Pay no attention to the .016, I measured it after it is .020.

    040.jpg
     
  3. Jun 6, 2017 #3

    Knight Twister

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    Good engine combo on a great design. Some of the best hand drawn plans around. Have you got the wing rib widgets yet? If not I would get 'em.
     
  4. Jun 6, 2017 #4

    FastEddie

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    If your looking for an "upgraded" VW engine, check out the AeroVee engine. They have a turbocharged 100hp version that weighs 185 lbs. and a NA 80hp version that weighs 160 lbs.

    http://www.aeroconversions.com/
     
  5. Jun 6, 2017 #5

    Mong

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    The Bitts engine weight limit is 160 pounds....The rear drive VW fits the weight spec. nicely. Did not know that Monnett's conversion was that light.... !! Thanks for the compliment, Knight Twister...
    Oscar Zuniga of Rouge Air parts still Sells the Widgets...I sold him the molds many years ago....
     
  6. Jun 6, 2017 #6

    cwilliamrose

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    Were those molds the ones we made for Polecat?
     
  7. Jun 6, 2017 #7

    lakeracer69

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    I already have the widgets, and Oscar has plenty right now if someone wants to build. The plans are well done and I'm able to visualize everything after getting well familiarized with them.
     
  8. Jun 6, 2017 #8

    Dennis5678

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    Do you mean that the engine will be like Steve's V-Witt the racing airplane he
    built for the Reno Class of VW powered racers?
     
  9. Jun 6, 2017 #9

    ab731

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    How about the UL Power Aero Engines UL260iS?

    Art

    Screen Shot 2017-06-06 at 1.20.07 PM.png
     
  10. Jun 6, 2017 #10

    lakeracer69

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    All I know is that I'm sticking with about a 1835cc VW ( 65 hp? ). I also am intrigued by the 1/2 0-200 a guy is trying to bring to market (Pegasus engine). It uses a proprietary crank and crankcase with two 0-200 cylinders. It also uses the accessory case and mags for the 0-200. I'm all about what is practical and safe and has some sort of a track record though.
     
    Last edited: Jun 16, 2017
  11. Jun 6, 2017 #11

    Mong

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    Bill, No, My widgets were for a 2 1/4" and 1 3/4" diameter tube spars...I had a special insert mold made to make the 10 degree canted tangs for top wing, and the straight ones for bottom wing....
     
  12. Jun 6, 2017 #12

    Mong

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    Dennis, Yes, and No....The rear drive case that Great plains sells uses a cut down flywheel with an aluminum prop shaft a few inches long... The Wittman conversion uses a long 17" ? cone with a bearing and shaft extension....BTW, there is no Reno class for VW racers. There was Formula Vee, and there is now Supervee, but they never ran at Reno...
     
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  13. Jun 7, 2017 #13

    cwilliamrose

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    Thanks Ed,

    Seems like I asked you about that before and couldn't remember the answer.
     
  14. Jun 7, 2017 #14

    f18shack

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    It's impractical and unproven but a Czech Verner 5si radial engine weighs about 150lbs and puts out about 80hp. A 5 cylinder mini-radial sure would look cool!
     
  15. Jun 16, 2017 #15

    lakeracer69

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    Some weldments, bushings, and tab progress. Long metal coming tomorrow from ACS finally.

    0081.jpg
     
  16. Jun 17, 2017 #16

    Mong

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    Looks good...Lots of time making these......
     
  17. Jun 18, 2017 #17

    Dennis5678

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    Have a dumb question:
    What are Widgets?
     
  18. Jun 18, 2017 #18

    Mong

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    Widgets are 'wing rib attach cups' They are an injection Moulded Glass Reinforced nylon fittings that properly attaches a wing rib to a tubular spar. Rivets hold the cup shape of the Widget against the spar, and the cup takes the shear load. They are used on several of my designs, and others designs as well.
     
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  19. Jun 18, 2017 #19

    cwilliamrose

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    Are you still bonding those Ed? I know the ion bombardment wasn't a cheap process when we did it for Polecat and it was a bit of a PITA to keep the surfaces pristine prior to bonding.
     
  20. Jun 19, 2017 #20

    lakeracer69

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    Here are Ed's "Widgets" bracketing this weekends parts. Although hard to see the one on the left is for a straight wing, and the one on the right has a 10 degree cant in the large radius that attaches to the tubular spars for a swept upper wing. They are injection molded out of Zytel ( Nylon 66 ).

    0011.jpg
     

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