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  1. DaveD

    Kei Car engines ?!?

    I was thinking the same on the Suzuki R engine, not sure how available the smaller ones are outside Japan though. I did a quick google, but couldn't find a weight.
  2. DaveD

    1-Up Concept Design

    I was thinking along the same lines with the "make the boom end look like a big rib and bond it to the skins" idea. I'm at the point now it's time to do some maths and see what works best...
  3. DaveD

    1-Up Concept Design

    You had me scratching my head for a moment there because I wasn't imagining a single piece wing, but a wing half with overlapping stub spar connections (for which the bending moment drops linearly to zero along the length of the stub spar). Then I realized you were talking about a single piece...
  4. DaveD

    1-Up Concept Design

    That was sort what I was imagining... but with a pin on the nose of the boom and a conical socket in the rear spar/shear web, but reading billski's later post got me thinking as to why it hasn't been used previously. For the load transfer to work without concentrating the load in small areas the...
  5. DaveD

    1-Up Concept Design

    More thinking out loud... I like the idea of the boom end being a giant composite taper pin and fitting into a tapered socket in the wing. I can only think that achieving the dimensional tolerance required for the parts is too difficult. It would have a large bearing area which is a good match...
  6. DaveD

    1-Up Concept Design

    That was a wild ride. I'm not sure my imagination did a good job of envisioning your current configuration! The shipping container hangar is an appealing idea, but it does create some horrendous design constraints.
  7. DaveD

    1-Up Concept Design

    Actually, transverse pin is a bad idea... I'm thinking lugs/brackets on the side of the boom and fore and aft aligned bolts through the shear web's web. The loading on the boom will be primarily transverse to the boom axis, with much less fore/aft. A single transverse pin isn't going to carry...
  8. DaveD

    1-Up Concept Design

    Thanks Billski, plenty of food for thought there. I had ruled out a one-piece wing on the basis it wouldn't fit / be constructable in my shed... but it's close. If I made the wingtips separately and ~600mm long rather than 300mm I'm thinking I could squeeze in a one piece! That leaves me with a...
  9. DaveD

    1-Up Concept Design

    I've long since resigned myself to the fact that the apex of my engineering career is going to be a witty one liner and not finding a closed-form solution to the Navier-Stokes Equations 😆
  10. DaveD

    1-Up Concept Design

    ...and yes, half hoop fixed main gear mounted either to the bottom of the rear bulkhead... or maybe the lower engine mount brackets where they join to the firewall.
  11. DaveD

    1-Up Concept Design

    Thanks for your thoughts Mark, the Micromaster looks interesting. You are quite right about the boom configuration, I'm committing the original sin of engineering and pursuing a configuration just because I like it! My blog is here: Ultralight Design Blog
  12. DaveD

    1-Up Concept Design

    Glad you liked the blog, I should add some content to it, it's been a bit neglected for the last couple of years. And thanks for the tip, there's lots of good stuff on the UWS channel by the look of it.
  13. DaveD

    1-Up Concept Design

    Yep the big wing is not ideal. Especially as it gets really hot and "thermally" here in the summer. Low wing loading makes for a bumpy ride in turbulence!
  14. DaveD

    1-Up Concept Design

    Full details here: CAO 95.10 the idea is similar to the UK's SSDR and US FAA Part 103. For a single seat, low momentum aircraft you have few limitations around design and construction . They don't care whether you kill yourself (that's your own fault!), as long as you don't hurt anyone else or...
  15. DaveD

    1-Up Concept Design

    I really like the Song. There's not much info on the internet and the web page hasn't been updated for quite a while, there seems to be a fair bit about the electric version though. Do you know how many were made and if it's still in production? If it wasn't for the fact I want to build... I'd...
  16. DaveD

    1-Up Concept Design

    Thanks for your thoughts! I considered making the booms removable much like you describe in option 2, but I think bonding them permanently is the way to go, if only from a weight point of view (but I might regret it if there's a tail strike or similar). My original thought was build a tapered...
  17. DaveD

    1-Up Concept Design

    I like the Sadler vampire a lot, but it doesn't fit into 95.10 and is metal with a composite pod... So I guess it's a kinda composite vampire... but more "inspired by" than "re-invented"... Plus the Vampire is mid-winged, so it's completely different :)
  18. DaveD

    1-Up Concept Design

    I've not shown it in the doodle, but I actually expect to mount the engine higher and the prop hub will end up slightly higher than the horizontal tail for better ground clearance. A three bladed ~65" prop will fit between the booms.
  19. DaveD

    1-Up Concept Design

    Life's been getting in the way for the last few years which has slowed work on my Project-Ex idea to less than a crawl... but the dream of a composite pusher has still been bubbling away. After some napkin doodling I've been toying with the idea of a single seat, mostly Carbon Fibre craft that...
  20. DaveD

    Honda K20C1 FK8 Auto-Engine Conversion

    Heat treating a part with surface finish that bad feels like polishing the proverbial turd! They'd have been better off spending the money on a sharper end mill or a more rigid milling machine...
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