Search results

HomeBuiltAirplanes.com

Help Support HomeBuiltAirplanes.com:

  1. R

    Aerobatic Tandem Two-Seater

    Also realized there isn't a proper current configuration "beauty shot" posted in this thread:
  2. R

    Aerobatic Tandem Two-Seater

    I used the Flow Simulation module of Solidworks for some very basic drag estimates. XFLR5 uses the VLM1 method which can be described here: https://engineering.purdue.edu/~aerodyn/AAE333/FALL10/HOMEWORKS/HW13/XFLR5_v6.01_Beta_Win32(2)/Release/Guidelines.pdf Even then, I only took very basic...
  3. R

    Aerobatic Tandem Two-Seater

    CFD was used for stability analysis. The only plan to use CFD is to identify any weird drag spots and to verify control surface loading. Stability analysis was done in Excel and then checked with XFLR5, which is wonderful program...that's also free! Being a converted Beech Bonanza, the T-34...
  4. R

    Aerobatic Tandem Two-Seater

    Yeah, I've been eyeing an airfoil replacement after going as far as calculating the MOI for the tail boom structure needed to handle the tail loads. Up until then, I thought dealing with the high wing pitching moment would just be a slight annoyance. Anyhow, I was just wondering if there any...
  5. R

    Aerobatic Tandem Two-Seater

    Any experience with the nearly symmetrical NACA 1400 series (1412, 1415)? Apparently the only aircraft to use it were the Decathlon, Douglas Skyknight heavy fighter, and Convair Tradewind flying boat...
  6. R

    Aerobatic Tandem Two-Seater

    Very intriguing airfoil. Did a quick XFLR5 (Xfoil) analysis on the airfoil and compared to others I was considering: From the study, the NACA 747A315 has an impressively low pitching moment...even lower than that of the NACA 23015! However, at the Reynolds numbers I'm using at it seems like...
  7. R

    Aerobatic Tandem Two-Seater

    Yeah, I am a bit concerned that the airfoil selection is more suited to a cruising platform than even a mild aerobatic machine... I was wondering if you had an airfoil recommendation? At this point I'm strongly inclined to go use a NACA 23000 series or NACA 4 digit airfoil. Part of my...
  8. R

    Aerobatic Tandem Two-Seater

    Price is pretty much why aluminum is the intended medium. Wet layups don't do much better than metal structure weight-wise and have much lower temperature resistance than simple sheet aluminum. Pre-preg would be competitive in all but price...especially for tooling. The thing with Riblett...
  9. R

    Aerobatic Tandem Two-Seater

    It'll only be an LSA if that new 3600lb gross weight rule gets approved. Aiming for 1800lb empty and ~2700lb max gross. Spec-ed out for using a flat-6 as a minimum (O-470/O-540) and up to an IO-720. The aerodynamics were designed with a Riblett airfoil for the wing.
  10. R

    Scale ME-262

    Took some measurements. Yeah, the cockpit is pretty snug.....but only based on leg room. The width is not that bad.
  11. R

    3D printing in the Homebuilt world.

    Found this stuff works pretty well: https://www.amazon.com/Smooth-XTC-3D-Performance-Print-Coating/dp/B00PFXK4JY/
  12. R

    Easy CAD software for modest requirements: Fusion 360? Other?

    Nice! Never did spring for the MMU as it didn't seem like it was worth it. I'd honestly recommend the Prusa just for the spring build surface. Never had a Mk2, but the Mk3 is so quiet that I sometimes don't realize that it's printing. I built the Lack Enclosure described here and it works...
  13. R

    Easy CAD software for modest requirements: Fusion 360? Other?

    Looks like the interface to a Prusa i3 mk3. Mine has been printing pretty much nonstop for the last 2 months. After upgrading some electronics and getting timelapse capability a couple days ago: @SVSUSteve BTW in Solidworks (and most likely Fusion 360), you can input coordinate curves...so...
  14. R

    Easy CAD software for modest requirements: Fusion 360? Other?

    Fusion 360 stayed free for me. Only thing was they asked again me if I was making over $100k from the software...answered no and the program worked as before. The license on top should change from TRIAL to STARTUP...
  15. R

    Easy CAD software for modest requirements: Fusion 360? Other?

    I used Solidworks professionally as an engineer for more than a decade, so I'm partial to that package. If I had to start again, though, I would use Fusion 360 just because it's a one-stop-shop solution. As it stands now, I have to import files into Fusion 360 in order to process them for CNC...
  16. R

    Lowrider 2 CNC Anyone build one?

    If you use port forwarding, you can use any computer anywhere. I use a similar system for my 3D printer called Octoprint and I can monitor progress on my phone. Both OctoPrint and CNCjs support webcams for you to watch the fabrication status. That's usually where those cool timelapse printing...
  17. R

    Lowrider 2 CNC Anyone build one?

    Decided to see what the machine was all about... Ordered the hardware/electronics kit from MPCNC and printed the parts in PETG. The set up is mounted on a piece of 2'x2' MDF, which is in turn mounted on a welded steel tube table. Currently have the stepper motors connected to a Mini-Rambo...
  18. R

    Neat idea for CNC router

    Was using it as an example, but the Arduino is connected to a separate driver component which powers the motor and only provides the signals to control the motor. There are more specialized controllers for this purpose though. Servo systems also don't adjust the g-code; the g-code tells the...
  19. R

    Neat idea for CNC router

    Yup, they're fairly common too and they're called servo driven CNC machines, as opposed to stepper driven ones. Servo motors have an encoder that indicates position. You can technically turn any electric motor into adding an encoder and connecting it to a controller (such as an Arduino), thereby...
Top