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ECHO Slope Wing

What are the specs for the glass or carbon cloth you are using? also curious what you used for the mini buzz carbon fiber version you did?
When I get my shipment of filament I'll probably start printing my molds. Amazon now has almost a 2 week delivery time for anything coming to Hawaii. Used to be 4-5 days but someone in the previous admin changed the USPS distribution hub guidelines and we rarely see that anymore. If its out of SF (which distribution to HI usually is) then it gets put on a boat that waits to be filled then goes to Honolulu then gets sorted and sent to Big Island. Island life bradda!
 
The two-piece mold for the vertical stabilizer is pretty small like I can print out the full set in about 6 hours. So I'm going to use that as my test to play with different thickness of fiberglass or carbon to see what layup I want to do.
 
Ill have to look up what carbon I got previously but for the first one, Ill be using some fiberglass that I unfortunately dont know what weight it is... I have a box with a bunch of random fiberglass
 
same, i think i have a bunch of either 4 or 6oz S-glass (stiffer stuff) and i have some 5oz carbon.
I may do one where i try and copy what was done on the Z1 wings where they have that cross weave of carbon tow across the wing to see what feels like.
 
Just curious if you guys have prototyped a 3D-printed version before going wild on a molding project. For that size, printing won’t be too heavy and can give you a very good idea of how the final design will perform.
 
We havent tried a 3d printed version for flying yet but I was thinking about trying to modify our design for that. Havent figured that part out yet but its on my list.
 
Gotcha. My ancient forays into fiberglass molding told me that the work involved is an order of magnitude more than 3D printing. Granted, 3D-printed airframe design is a project in itself, but I think you’ll save yourself a mount of work in the end if you want to iterate the aerodynamic design.
 
Yea, its definitely a good idea and a quicker way to get a flying model for testing. I am working on a 3d printable version now so hopefully in the next day or two I might have something to start printing.
 
This really didnt take much man hours to get to this point. A week of printing parts while i was at work. Not going to go crazy on this first mold finishing it to perfection. For me im confident the plank will fly, this is more about having a mold to start messing around with making parts off of it.
 
@OribaSJ88 I have seen @thenated0g dive right into project after project like this for many years. Only occasionally has it not worked out really well. I have thought more than once "well that's not gonna work" only to be proven wrong time and again. I am an overly careful and cautious modeler/designer. I usually take way longer to get anything like this started or done. I often suffer from "Analysis paralysis" while Nate charges full speed ahead and get more done in a month than I do in a year.
I had to learn years ago that he genuinely doesn't care or get annoyed when something doesn't work as expected, he just moves on or starts again happy to have tried or learned something. I would like to think that my constantly making fun of his build skills early on has helped him to be a better craftsman but probably not. He could mock me for dragging my feet eternally. Nate and I have been getting to know @Yotaman1985 better and found that his design and build skills are top notch. Both of these guys love doing this kind of stuff whether it works or not. Anyway, I think this wing is gonna turn out great!
 
Ive been messing around with trying to make the CAD model 3d printable and keep running into issues trying to slice it into pieces small enough to print for some reason. I may continue to mess with it off and on but I think I will primarily focus on the molds/composite version. Like Nate said, it hasnt taken a ton of time, effort or materials to get to this point and I think we both can get flying models from the molds we have made even if they wont look pretty yet. I do really like the idea of a 3d printed version too so Im sure Ill figure it out at some point but its going to take some time and effort.
 
thenated0g said:
I have no idea how to do that internal structure on 3d printed planes, that part scares me.
Click to expand...
I wasnt going to worry too much about that and just let the slicer infill with a light pattern and %... Probably not the correct way or best way though.

I couldn't get it to slice the wing into multiple parts for some reason. All the slicing methods I tried would cause the part being sliced to disappear so the only way I figure I can do it is to start from scratch and remake each section of the wing separately which would take a bit of time...

I was planning to just cut the elevons out, create a compartment for the receiver and battery, make some crude servo pockets and run some holes through the wing for the servo wires. I was thinking of adding some holes for carbon tubes to link the pieces together and would need a slot for the vertical fin too. I will probably come back to this when I have some time and get it figured out but Ill keep going with the molded version as my primary right now
 
thenated0g said:
I have no idea how to do that internal structure on 3d printed planes, that part scares me.
Click to expand...
Doing it by hand is only really needed if you want to print in vase mode, which is how the foaming filaments print well.

Look at Geode's planes and most other 3DP planes on RCGroups, they almost all use the slicer's infill options. The Slingshot that MOM is using is also using slicer-based infill.

The thing that bugs me about the SoarKraft models is that they have hand-drawn internal structure while still not being vase mode compatible. IMHO it makes the design too sensitive to differences in slicer versions and a wide array of settings and filaments.

And yeah, I have found that doing anything to the model in the slicer (like cutting it up to make it printable) is a terrible experience.
 
oh that makes it easy. So you make it hollow, make a tube for carbon and than it fills in the rest. What kind of infil pattern and percentage are good starters?
 
Yotaman1985 said:
I couldn't get it to slice the wing into multiple parts for some reason. All the slicing methods I tried would cause the part being sliced to disappear so the only way I figure I can do it is to start from scratch and remake each section of the wing separately which would take a bit of time...
Click to expand...


To split a part in Onshape, use the Split tool. It acts as an electronic knife that cuts a single solid body into two or more distinct parts using a plane, a flat face, or a mate connector.
Follow these steps to perform a split:
  1. Select the tool: Click the Split tool in the toolbar (it looks like a box being sliced in half).
  2. Choose the target: In the dialog box, ensure the setting is set to Part. Select the part you want to cut from the graphics area or the parts list.
  3. Select the cutting tool: Click the Entity to split withfield, then select the plane, sketch, or face of another part that you want to use as your cutting blade.
    • Finalize: Click the green checkmark to complete the split.
Once the operation is complete, you will see multiple distinct parts listed in your Part Studio.
For a quick, visual walkthrough of using planes and faces to divide parts in Onshape:


Advanced Splitting Options
If you need to customize your cut, Onshape provides several toggle options in the Split menu:
  • Keep both sides: Uncheck this if you only want to keep one side of the part and delete the other.
  • Trim to face boundaries: Check this box if you are using a flat face or surface as a cutting tool, and you only want the cut to be as large as that specific face (otherwise, Onshape will extend the face infinitely like a plane).
  • Keep tools: Check this to prevent the cutting entity (like a plane or surface) from disappearing after the split.


youtube example link

another example

yet another example
 
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