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  1. #11
    RC Noobie
    Join Date
    Sep 2014
    Space Coast of Florida
    This is a really cool concept! Can't wait to see it up and flying!
    "Another happy landing" - Ben

    FT Simple Scout, FT Mini Arrow
    Micro quads
    Retired/Grave Yard:
    FT Simple Storch

  2. #12
    Jetcrafter_2000's Avatar
    Join Date
    Aug 2017
    Germany, Stuttgart
    This thing is crazy!!!
    Looking gread and i hope the best for your projekt!

    Looking forward to the maiden (and the video)!

  3. #13
    Thanks jetcrafter and connxt! I appriciate it

    It was quite a bit of work but I managed to finish the 3D models of the propeller cage and motor mount.
    For the first concept I will make the parts with my 3D printer and laminate with Glassfiber/epoxy for
    additional strength.


    Motor mount has air channels to keep the motor cool

    And the individual parts the assembly is made out of. Each of these carbon parts is used 6 times.

  4. #14
    For those who are interested in a bit about how I designed the arms. In the screenshot below you can see a bit more (Basically I made a load of reference planes that I made sketches on and I connected those sketches with 3D sketches. After that I finished it with a loft extrude):

    And for good measure a side view of the finished model. You can also see the motor mount here with the cooling slots.

    The printer is allready busy making the first ring segments!
    Last edited by Stefs Engineering; 01-13-2018 at 12:00 PM.

  5. #15
    The printer is hard at work, I am almost finished making the six ring segments.

    On to some other progress I made yesterday evening, I made a concept version of the main frame that attaches all the components together. In this concept version my goal was to get a good idea of the rough shape. The next step is the so-called "DFM" (Design for Manufacturing) inwhere I optimise the design for manufacturing and assembly. In this case that means that I will split the frame up in roughly 10 pieces. Allthough it makes it a bit more complex, it will also make it a lot easier to make. Besides that, having more smaller pieces means that If I want to change something it is likely that I only need to change one small part instead of the entire frame (this also helps in case of damage caused by rough landings/crashes)

    Concept render of the frame, I made it blue to make it stick out a bit more from the other parts.

    The weather is still not that great but couldn't resist going out to take a few pictures of the wing:

  6. #16
    Today another day at high speed! Besides designing I also printed the 6 ring sections that connect to the ring arms. It took a while, almost 20 hours! The next step for these ring sections is preparing them for assembly (glueing together) and laminating with fiberglass/epoxy.

    Here are most of the parts I am going to use for the trike. there are some servo's missing in this picture but of each type there is at least one. The other items are for example the printing filament and materials for the laminating.

    And for the fun of it, a picture of the wings indoors. And I tought I had a big workbench! well not anymore I guess (the wings are not even halfway unfolded)

    Tomorrow I will continue printing and finish the design of the centerframe.

  7. #17
    Before any really issues arise, a quick question:

    While following along, did the experienced paramotor pilots here spot
    possible issues or mistakes I made that I should fix or watch out for?

    I'm learning as the project is progressing so I have no illusion that everything will go perfect the first time.

  8. #18
    I got a suggestion on RCG and thought it may also be interesting here. So this is what I answered:

    You are definately right that having the bulk of the weight low and the point where the risers connect high will give you more stability. Besides that, not having the vertical COG on the torque axis (motor axis in this case) will help a lot by itself.

    I did consider this a bit but I agree that the offset should be a bit more. The main reason for the configuration that I showed in the renders is that I wanted the cleanest and least obstructed airflow to the propeller and working with a conventional setup you definately block a lot of the air. The result is that you get less efficiency out of the setup and besides that it will introduce more noise from the turbulent air going through the propeller.

    I got curious and calculated the difference in obstructed propeller disc area:
    Disc area: 1660cm2 - 24cm2 (propeller hub area excluded) = 1636cm2 (253

    Concept version: 272cm2 (42 16.6% "blocked"
    Conventional setup: 595cm2 (92 36.4% "blocked"

    Ofcourse it is not as rigid as shown here, there is some airflow in the conventional setup because the backplate is not mounted within a few mm of the propeller. Same with the concept version I am working on now, it will have external covers that will help the airflow a lot, even when I increase the height of main body.

    Here is a front view render that shows how little is obstructed at this moment:

    And a render of the back with 2 additional batteries mounted (That I intend to do in the real model)

    I will put it on the list though of things to take in consideration for the design I am sure I can change some things without having too much of a negative impact on efficiency .

  9. #19
    Cardboard Boy Fluburtur's Avatar
    Join Date
    Jul 2016
    You could put some aerodynamic fuselage to provide cleaner airflow to the prop, with some NACA inlets it could look quite fancy

  10. #20
    Illegal Squid Fighting? agentkbl's Avatar
    Join Date
    Nov 2016
    Marysville, Washington
    I second flubutur
    "Fold the parts up till it looks like a plane, glue it so it stays that shape, screw in a motor and some electronics and toss it in the air."

    "Simplicate and add lightness."

    (I take no credit for the above quotes in my signature. I simply thought they were clever.)

    Hangar: Ultra battered FT Pietenpol. it flies great! me, not so much.

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