Search results

Homebuilt Aircraft & Kit Plane Forum

Help Support Homebuilt Aircraft & Kit Plane Forum:

  1. I

    Warbler

    I have asked several questions on here about Chris Heintz's book. This is because this is one of my primary references. I wanted to show off my (incomplete) spreadsheet that follows the example at the end of the book. I've found lots of typos, mistakes, and a general lack of references. One...
  2. I

    The state of our (dying) sport 2022

    I forgot to say one other thing that I just remembered now that I'm back home from a gliding lesson ($400 for three flights makes my wallet cry). We have one solid way to save our hobby: primary gliders. I know a lot of people laugh at this, but there's a lot going for them. Bob Hoover's article...
  3. I

    [Cheap] 96" Leaf Brake

    Pops, Yes, I have plans for the MM brake. I'd like to build one, but there are a lot of people who are unable to build one, so I'm trying to think about how those people would get around that. I'm very tempted to buy one of those straight brakes to see about making a new leading edge form with...
  4. I

    Warbler

    OK, I'll post a little here. If you'd like to talk about it, shoot a message. I'm trying to design a light sport that fills the role of the Sonex model A. I think it's insane we aren't cutting our own kits. People don't want to build from plans anymore, and I think that's really only because...
  5. I

    The state of our (dying) sport 2022

    I’m 25, and I have a total of about 78 hours. I started flying when I was 13. I’m a lifetime EAA member. I would’ve been in that picture in the first post, but I now have a full-time job. I’ve struggled to juggle home building with flying because I enjoy both so much. • spent about 4 years...
  6. I

    [Cheap] 96" Leaf Brake

    Did anyone else notice Mittler Bros. has a 96" leaf brake? I just noticed it: 2800-9622S I've been pricing materials to build a mac's machine brake, but this model is about the same. It comes with a 1/2" radius bar, but it doesn't seem like too much trouble to manufacture a 1/8" radius bar. It...
  7. I

    Kuhn's Diagonal Tension Factor

    In case anyone else is curious: it’s Equation 5 in the text. $$k = \tanh(0.5 \log_{10}(\tau/\tau_{CR}))$$
  8. I

    Kuhn's Diagonal Tension Factor

    Figure 7 of report 1364 was what I was looking for. Thanks! Now, I need to read the whole report. Yes, it’s a cluttered book, but it’s really a nice, comprehensive coverage.
  9. I

    Kuhn's Diagonal Tension Factor

    plncraze, Thanks for looking. I really appreciate it. Yes, Heintz rounds... a lot. It can be really hard to follow him because he constantly changes between units (and uses weird ones too sometimes to meet his approximation formulas). These graphs look pretty similar but not quite. I'm looking...
  10. I

    Kuhn's Diagonal Tension Factor

    Chris Heintz's book makes many references to Kuhn's Diagonal Tension Factor. I understand that Kuhn wrote an entire structures textbook. I'm trying to dig through to find any curves that match the one on page 185 in the 3rd edition of Heintz's book. Can anyone tell me where I can locate this...
  11. I

    Baby Aerovee

    vigilant1, I did buy an Aerovee with a prop strike. I didn’t realize the cylinders were burned up, so I will have to rebuild the entire thing. I am considering buying the 1835cc kit from GP and using that with the starter/ignition system from the Aerovee. I’m trying to figure out if there’s...
  12. I

    Baby Aerovee

    Pops, Aerovee serial numbers are tied to the accessory plate. I am allowed to buy parts from them, but I cannot buy a new accessory plate. It seems like a waste of a good starter and ignition system if I don’t rebuild, but parts from GPA are just so much more reasonably priced.
  13. I

    Baby Aerovee

    Hi all, I prefer the Aerovee ignition system over the mags. Since I am working on a Thatcher CX4, I’m considering the possibility of going with an 1835cc, but I have a huge portion of Aerovee parts. 1835cc parts are much more affordable, and I’m tempted to consider pursuing an 1835 build. It...
  14. I

    Wing attachment angles

    I’m not sure where to put this, but it seems like it should go in general design. I can’t find the answer using the search box and this has been over the course of about a week. Perhaps I don’t have the right keywords. The Zenith and Thatcher center section spars are square at the end, and the...
  15. I

    LAA Schrenk Approximation

    Also, I have a copy of the original paper already!
  16. I

    LAA Schrenk Approximation

    Hot wings, You are a lifesaver. I was still lost at that. Thank you so much to you both! Yes to plncraze, it starts with a basic Schrenk approx and then builds on it. The beginning stuff is pretty easy to follow. It’s not impossible to be successful when sharing a spreadsheet, but the steps...
  17. I

    LAA Schrenk Approximation

    Bilski, I checked before posting. HotWings cited the LAA paper awhile back. That's the only mention. The work for Schrenk's distribution has already been done. This is more of a reaction force question. I finally figured it out after being stuck on this today. As the paper states, "Hence, at...
  18. I

    LAA Schrenk Approximation

    Hi All, I'm trying to learn a bit about Schrenk's approximation. There's a great little document from the LAA on Schrenk Approximation (http://www.lightaircraftassociation.co.uk/2010/Engineering/Design/schrenk%20approximation.pdf), which I'm trying to emulate. I've gotten consistent results...
  19. I

    Tell us what you are building!

    Hi all, I just realized this thread exists. I'm building a Thatcher CX4. The build log is here: Connor's Thatcher CX4 Project I have the wings mostly done. I bought a salvaged Sonex (935EK), and I'm trying to use as many of the parts from it as possible. Unfortunately, the engine is beyond...
  20. I

    OnShape Sheet Metal Ribs

    Yes, size of the CNC is definitely an issue. I have a V1 Lowrider2 in the 2’x4’ work area, and I’m making an assumption that others will only be able to have something that large. this is a possible open source design (for liability) in the very early stages. The goal is minimize cost by not...
Top