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  1. R

    “Easiest” of Mike Sandlin’s Ultralights to build?

    A very neat job! Looks like a lot of work. Doublers do not need to be an especially close fit to be effective. Memory comes up with something like clearance (IDouter - ODinner) < ODouter/25. Doubler length does come into it, something like Linner > 10*ODouter. The main issue is keeping the...
  2. R

    New airfoil website

    Hadn't considered this, but not a bad idea - thanks.
  3. R

    New airfoil website

    Darn, thought it was too good to be true!
  4. R

    New airfoil website

    Yes, R44 typically.
  5. R

    New airfoil website

    Thanks for this. I've had a couple of messages about the Storch replica as well. There is a 2001 one for sale in NSW, will see if I can get someone to have a look at it.
  6. R

    New airfoil website

    Sorry blane.c, good point. We use helicopters for the main mustering, but they are expensive, fragile and have to be booked well in advance. The fencing crews go out with quad/dirt bikes to manage strays - and usually take a utility dozer and grader - but the bikes are very limited in area, are...
  7. R

    New airfoil website

    For some time, I've been looking for an answer to whether or not, for a low, very slow and hopefully highly manoeuverable plane, it would be more effective to have a wing with a high lift airfoil, or to use a lower Cl base airfoil with high lift devices (slats, flaps). Any opinions and/or...
  8. R

    Basic Configuration for a "Safe" airplane

    If and when one does get into trouble, some design features that assist survivability. An intrusion resistant safety cage and roll bar, ergonomic seating position, supportive seat, restraint system (best is a 5 point harness and lightweight helmet - no need for airbags), crumple zones to reduce...
  9. R

    Look out below! New builder on the block.

    Pretty close, then! Happy to have a chat, or if you ever would like some assistance with those two-person jobs, happy to be contacted. Years ago, before marriage and kids, I used to occasionally fly in/out of Albion Park - hopefully I will be able to do so again, if ever this lockdown ends and...
  10. R

    Look out below! New builder on the block.

    Hi Dalmo, where abouts in NSW are you? I'm in Hurstville in southern Sydney.
  11. R

    Single Tube Fuselage idea

    Thanks for the info. One rib-stitching was enough for me - and not even my plane.
  12. R

    Single Tube Fuselage idea

    Ok, thanks - my apologies, I didn't connect the two. I have been hoping to run across a no-stitch fabric covering method. As an aside, another way to get a very good surface finish on a composite mould that can be built/formed quite easily is to use gloss laminex. Here, one can get it in sheets...
  13. R

    Single Tube Fuselage idea

    Sorry, I have done a search, but no luck other than this post. Would you point me to the "Russian wing covering technique"? Thanks.
  14. R

    Wooden spring/Wittman gear?

    Aviacs - wow, that takes me back. In the very early days, for pocket money, my cousin and I used to cut ox-horn strips and taper plane them, as well as scrape and polish sinew strips. Both glued with animal (casein?) glue to the laminated wood cores. Towards the end, the tension side was carbon...
  15. R

    Wooden spring/Wittman gear?

    Another place to look for information regarding timber laminate and designing for this application might be bow-making. My uncle made competition bows of all types from the 60's to the early 90's. The compound bows in particular were very robust and took a hell of a lot of force/stress and...
  16. R

    Thundergull

    Hi, no response to e-mail or phone from here. Peter has bought a plane and is cheerfully commuting Cowra/Canberrra/Orange (J170, I think). So curses, I don't get to build one with/for him. Back to dreaming.
  17. R

    Thundergull

    Clanon What's so good about the wing - the airfoil section? I didn't think laminar flow was achievable on ultralight wings - at 2.3M (63mph, 4.75 ft chord) I would think the Reynolds number is too low to avoid turbulent flow. The wing surface would need to be pretty much optically flat and the...
  18. R

    Thundergull

    Ok, thanks. Will give it another go. A fairly comprehensive search shows none registered/flying in Oz.
  19. R

    Thundergull

    A couple of questions regarding Earthstar in California. Airplane is Thunder Gull 2000: 1. Is Earthstar still a going concern? So far, no response to e-mail or phone, but my mate has only been trying for a couple of weeks. The web-site feels pretty current. 2. Peter is 1.87m and 95kg and 71...
  20. R

    Spar cap material

    Pre- and post- stressing can be used effectively because the tension side of the member is known. Such members are not (or at least, very rarely) designed for any level of stress reversal. As for torsion, concrete/steel members that need to withstand torsion are shuttered - ie completely...
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