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Thread: Roundtuit


  1. #1
    Lifer's Avatar
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    Roundtuit

    Does anyone know of a source for plans or dimensions of the old .40-powered Roundtuit? I would like to build one.

    Thanks in advance!
    AMA #77967/CD/LM

  2. #2
    the.master.link's Avatar
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    RE: Roundtuit

    Lifer, I hope you have found the Roundtuit by now? I have been wanting to locate anything I could find about it myself. I have looked over all he files and forums I could find, and today I found a two page of posts by: Ptarmijan ->RC Flying Disk Questions (1/20/2003 2:18 PM), and in it he posted his desire to build a Roundtuit and make it look like a UFO. Later, Richard Link

  3. #3
    Lifer's Avatar
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    RE: Roundtuit

    No luck yet. I have an engine and some coroplast, but have gotten no further than that. I'll post any progress I make. Thanks for your reply!
    AMA #77967/CD/LM

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    RE: Roundtuit

    I don't have a plan, but this one is a 27" disc, 1" thick. I am not proud of it for sure. It was $20 at a swap meet with motor and an AMradio ready to fly with a Supertiger .40. It looks like there was a rudder on at one time that wasn't needed. Inever flew it yet, but the gentleman said it could fly backwards in a breeze. It looks like a good candidate for a downspout fuselage. This one is plywood doorskin and the wing is cut around it making it pretty weak IMHO.
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    Glow Head Hood # 7

  5. #5
    Lifer's Avatar
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    RE: Roundtuit

    What I need is the downspout. 3.5" square by 18" would be fine. Cannot locate it except in large quantities, plus shipping.
    AMA #77967/CD/LM

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    RE: Roundtuit

    Most people use the 2 3/8" or 2 1/2" sq. stuff.  The rectangular  stuff is a bit bigger in the one dimension, and easier to find, but normally has ribs in it.  Maybe check for some fenceposts for different sizes.  Doorskins can be made up pretty quick and even after painting take less time than driving to the Home D'pot.  The plane won't be pretty anyway.
    Glow Head Hood # 7

  7. #7
    Lifer's Avatar
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    RE: Roundtuit

    Do you know of any U.S. retailers that sell the pipe?
    AMA #77967/CD/LM

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    RE: Roundtuit

    The Pizza Box Flier was a 24" square. It could easily be cut in a circle. I'd make it larger for a .40 as the PBF was designed for a .25. Maybe 30" in diameter. It was cut from 4mm Coroplast. run a few carbon fiber tubes down the flutes to keep the wing stiff in case you fly too fast.

    The "fuselage" was a 1/2"-3/4" aluminum channel from Lowe's. It was just wide enough for a standard servo to snugly fit into and be held with a zip-tie. The engine mount was 1/4" ply, or hardwood bearers-your choice. Another option is an engine mount cut from a plastic cutting board from the kitchen section of Wal-Mart. This is not a precision project.
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    Ed Moorman, AMA 553, Former R/C Report Fun Aerobatics Columnist. 76 and up to my old tricks!

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    RE: Roundtuit


    ORIGINAL: Lifer

    What I need is the downspout. 3.5" square by 18" would be fine. Cannot locate it except in large quantities, plus shipping.
    Lifer, I have some 2-1/2 X 2-1/2 downspout, if you will pay the postage to your house I will cut an 8 foot length into equal pieces I will send it to you? Later, Richard Link, 611 Lamkin RD, Harlem, GA 30814, 1/706/556/6890.

  10. #10
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    RE: Roundtuit


    ORIGINAL: Lifer

    Does anyone know of a source for plans or dimensions of the old .40-powered Roundtuit? I would like to build one.

    Thanks in advance!
    Lifer, I am trying to send you a picture of a .40 size Roundtuit, but this thread is not taking it...?

  11. #11
    Lifer's Avatar
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    RE: Roundtuit

    I got the email and the picture. Thank you! It looks like 36 inches?
    AMA #77967/CD/LM

  12. #12
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    RE: Roundtuit

    Richard,

    Got the pipe yesterday. Thank you! I mailed a check yesterday as well. What I plan to do is use a 24" disc made of coroplast, and the first 3" of the leading edge will be recessed at an angle/curve into the pipe. I'll cut a small access panel into the bottom for radio and tank access. I'll find a piece of ply for the firewall and glue/screw it to the front of the pipe. I also plan on dual, functioning rudders to allow spins.

    Best guess for balance will be 28 percent of the chord. I have an unemployed GP .42 for an engine.
    AMA #77967/CD/LM

  13. #13
    the.master.link's Avatar
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    RE: Roundtuit

    Lifer, Good to see that you can finally get started on your Roundtuit... I hope you will also build a .40 which I do believe to be what the original Roundtuit 's fuse ( a 40inch) across from side to side were made of... Please post some of the photos of this build to give the round plane something to use to build themselves one... Later, Link

  14. #14
    the.master.link's Avatar
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    RE: Roundtuit


    ORIGINAL: Lifer

    Richard,

    Got the pipe yesterday. Thank you! I mailed a check yesterday as well. What I plan to do is use a 24" disc made of coroplast, and the first 3" of the leading edge will be recessed at an angle/curve into the pipe. I'll cut a small access panel into the bottom for radio and tank access. I'll find a piece of ply for the firewall and glue/screw it to the front of the pipe. I also plan on dual, functioning rudders to allow spins.

    Best guess for balance will be 28 percent of the chord. I have an unemployed GP .42 for an engine.
    John, I received your check and note about wanting to do a Roundtuit since the '80s... WOW, I sure hope you build it correctly and that it flies wonderfully. Please keep this thread showing all your steps to it's build by photos... And please include all the steps, and modifications as you build it... Later, Richard

  15. #15
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    RE: Roundtuit

    You can make a plywood plate that boltsinside the bottom of the downspout to hold the motor too. The tank is a little harder to squeeze in but it is another option that is quicker than a firewall, plastic motor mount, landing gear mount? etc.
    Glow Head Hood # 7

  16. #16
    Lifer's Avatar
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    RE: Roundtuit

    I am currently in the process Disney called "Imagineering." I have the downspout, coroplast and will acquire some plywood for the firewall. I think I will insert the first 10% of the leading edge into the pipe with a gentle, descending curve. That will give more lift than a flat plate. I will cut an access hatch on the bottom for tank and radio installation. Dual rudders on each side of the rear of the fuse.

    This won't be fast, but it will be fun.

    Also, thanks to all of you for your help and encouragement!
    AMA #77967/CD/LM

  17. #17
    the.master.link's Avatar
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    RE: Roundtuit


    ORIGINAL: Lifer

    I am currently in the process Disney called "Imagineering." I have the downspout, coroplast and will acquire some plywood for the firewall. I think I will insert the first 10% of the leading edge into the pipe with a gentle, descending curve. That will give more lift than a flat plate. I will cut an access hatch on the bottom for tank and radio installation. Dual rudders on each side of the rear of the fuse.

    This won't be fast, but it will be fun.

    Also, thanks to all of you for your help and encouragement!
    Lifer, Where did you go to? We are all waiting for you to do some of your posting about the Roundtuit.Later, Richard

  18. #18
    Lifer's Avatar
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    RE: Roundtuit

    Probably won't get much done til cold weather arrives. I fly for the 3 seasons and build during the 4th. I always gather materials prior to the building season so my progress won't be interrupted. I will post once I get started. Thanks for you patience.
    AMA #77967/CD/LM


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