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  1. rtfm

    Proper Strength of Plywood

    Hi, I know this is an old thread, but I'm into recycling... No-one has mentioned Australian Hoop Pine plywood. It is made to the Australian AS 2272 standard, and is superior to the somewhat outdated BS 1088 standard. Basically, a beautiful plywood surpassing just about anything else available...
  2. rtfm

    The AFB (Amazing FleaBike)

    Hi, Bad news, I'm afraid. I ran into some unexpected issues when I tried to actually construct the fuselage. First, the bloody plywood sheets are so !@#$% heavy that when I tried to get it onto the router table I hurt myself. Left shoulder hurts like a bastard, and I put my back out. I can't...
  3. rtfm

    Anniversary of Mark Stull's death

    Mark Stull - Innovator, intrepid builder, experimenter, and an inspiration to us all. Died today back in 2013 (I think) On the maiden flight of his new design. RIP Mark...
  4. rtfm

    The AFB (Amazing FleaBike)

    Hi, As I say, the incidence of the rear wing is a vexed issue, with no clear "right" answer if the rear wing incidence is fixed. In the early days, the incidence angle used to be set at 0 deg. Over the decades it has increased, till the now "standard" incidence is 6 deg. But a fixed incidence...
  5. rtfm

    The AFB (Amazing FleaBike)

    Hi, Quite correct. I put the 12.22 in the kg/m^2 column by mistake - it should be lbs/ft^2. Thanks for the pick-up.
  6. rtfm

    The AFB (Amazing FleaBike)

    Hi, Actually, the rear wing incidence you are referring to is that of the standard HM293 (a picture from the HM293 plans overlays my drawing back on page 4). [Duncan get's ready for some lively discussion...] Actually, my rear wing is fully movable, being connected to the main wing incidence...
  7. rtfm

    The AFB (Amazing FleaBike)

    No pictures, but today I bonded the keel, and then the front half of the airframe to the template. On Serial #2, I'll use 3mm ply for the template, both to give it a more secure shape, and to add some rigidity. Not that the 1.5mm ply wasn't dimensionally correct - it is - but for a very few...
  8. rtfm

    The AFB (Amazing FleaBike)

    Hi, Yes, I have. The double plywood shear webs in that area are an average of 140mm high. Any wing that deep with two 3mm solid shear webs would raise an eyebrow only for being over-built.
  9. rtfm

    The AFB (Amazing FleaBike)

    Hi, Thank you. I agree with you. While opinions on this forum are sometimes very helpful *VB's suggestion as an example) I'm flying my own kite, and am very happy with the design as it is. I covered the build table with plastic sheeting, and laid out all the pieces this afternoon, ready for...
  10. rtfm

    The AFB (Amazing FleaBike)

    Hoop Pine. An Australian native - very similar to Spruce.
  11. rtfm

    The AFB (Amazing FleaBike)

    I wasn't worried about the seat area till you guys started picking holes in it. A half bulkhead running fore/aft under the seat? But then again, maybe not.
  12. rtfm

    The AFB (Amazing FleaBike)

    Hi erkki67, Any idea if it snapped in two at the seat section? :) Duncan
  13. rtfm

    The AFB (Amazing FleaBike)

    Hi, I'm with you. However, this is (like all things in aircraft design) a compromise, with "good enough" being good enough. I've taken all the precautions I can with the design, but ultimately, only time will tell. Bear in mind also that this is an extremely small and light airplane. The...
  14. rtfm

    The AFB (Amazing FleaBike)

    Hi, The seating proportions are taken from the HM293. Here are the two designs overlaid. The AFB has a more reclined sitting position, and a more raked windshield. I THINK I've got it right - but I'll soon know...
  15. rtfm

    The AFB (Amazing FleaBike)

    Hi, Ha ha. I've had to obey she-who-must-be-obeyed, and tidy the garden today. But I did manage to cut the missing and/or buggered up parts. So all pieces are present and accounted for. I have a dance lesson tomorrow morning, but in the afternoon, I plan to actually start building. PLENTY...
  16. rtfm

    The AFB (Amazing FleaBike)

    Hi, Nice idea. Thank you.
  17. rtfm

    The AFB (Amazing FleaBike)

    Hi. The cabin area is reinforced with a 3mm ply doubler on the inside, as shown below. Do you mean the base of the seat? Because every other corner is clearly radiused. But consider - the seat base and back are separate pieces, so no stress risers possible. Actually, I'm going to be using...
  18. rtfm

    The AFB (Amazing FleaBike)

    The difference is in (1) precision of fit (2) build time. For example, I cut out the entire fuselage (ie both sides) in just over 4 and a half hours. That was yesterday's job. Today, I will glue them all together. Since this is my first plane using this method, I fully anticipate some...
  19. rtfm

    The AFB (Amazing FleaBike)

    Incorrect. If I were relying only on the end-bonds, you would be correct. But the structural pieces are sandwiched between two pieces on ply. On the inside is the 1.5mm template, and on the outside, a full 3mm sheet. Those structural pieces aren't going anywhere... Think of it this way...
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