Jump to content

Raytol

Members
  • Posts

    110
  • Joined

  • Last visited

Posts posted by Raytol

  1. Design an aircraft made with bamboo and bamboo cotton or hemp fabric! Maybe a copy of a very early aircraft such as "Wrong way" Corrigans.

     

    Put eyelets in the fabric and pull tight with cable ties. Bind the joints with wicker and get some wheels off a Honda "step through" scooter.

     

    Maybe use some cable wire for bracing. Just a thought bubble.....

     

     

    • Like 3
  2. Why not check out a Caproni jet glider. I had a ride in one with Mike Burns at Tocumwal NSW. Fantastic performance! even if it took a lot

     

    of runway to get off. They built a few "short winged" ones for an Italian jet trainer. TRS-18 jet I think.

     

     

    • Like 1
  3. The law is very reticent to "lift the company veil" in Australia as the Pollies and Lawyers are themselves protected by it!

     

    It can only be done if the actions are fraudulent or grossly negligent.

     

    Insurance companies love the "what if" situation and I would like to know if any designer/ engineer has ever been subject to

     

    litigation in Australia and found against.

     

    Other Australian aircraft manufacturers are still going strong even after all their problems, how?

     

     

  4. Thanks DJP.

     

    This is not 1990! That was in the "bad old days" when designers and manufacturers in the USA were being sued mercilessly in a

     

    one sided contest. They stopped frivolous litigation by suing the plaintiffs so they had something to lose as well.

     

    NSW has a "dangerous pastimes" act that helped pony clubs, BMX and motocross clubs, etc negate their risk of litigation.

     

    Hands up anyone who knows of any designer, engineer or aircraft manufacturer who has been sued under Product Liability laws

     

    in the 19 category.

     

     

  5. Thanks Geoff, I think the airliner in your box may be a bit overpowered!

     

    In my case, the aircraft structure has already been designed and tested by an AE to BCAR secion E. Unfortunately the AE is deceased

     

    and is no longer available for consultation. There are 50 odd flying.

     

    I believe that the CASA orders are written to make the PILOT the one solely responsible for the safe flight of aircraft in this category.

     

     

    • Like 1
  6. Hi YoungGrasshopper,

     

    If the one you just bought has a round tube trailing edge and a welded aluminium aileron, then it is one of the 13 I built

     

    waaay back. I just heard from someone who bought one of my "Stingrays" and it is as good a new inside.

     

    Send me some pics and I can tell you exactly what to do.

     

    raytol at tpg dot com dot au

     

    Ray

     

     

    • Winner 1
  7. Thanks Bex,

     

    Yes, once the calculations are done for the structural optimisation I'm sure there will be some changes.

     

    It seems to me that the rear vertical diagonals are in compression instead of tension which is ok if you have thick walls.

     

    Titanium landing gear perhaps?!

     

    Build manual is coming along. Service... well it is not up to me to judge.

     

    I like your idea for the ribs.

     

    Always open to ( not rude) suggestions!

     

    Regards,

     

    Ray

     

     

  8. My basic calcs show the aircraft is waaayy over strong! It would be nice to optimise the structure

     

    for say 750 Kg's MTOW @ +4,-2 G's taking the strongest parts from 544Kg/600Kg @ +6,-4G loadings.

     

    Will have to test things like engine mounts, battery box and tailplane mounts, etc.

     

    Practical changes:25 x 2mm longerons from the pax rearwards.

     

    All 25 x 3mm vertical, lateral and angle braces to the thinner gauge used.

     

    All 0.025" sheets to 0.020".

     

    Aluminium ribs rather than the fiberglass ones.

     

    Titanium HS spar.

     

    10kg landing gear too heavy (and get it out of the airstream).

     

    I'll send you my bill.

     

    What you really need to do is get your build manuals and service together, not much wrong with the product.

     

    You're welcome.

  9. The task will suit a retired Aeronautical or Structural Engineer and involves checking, optimising and testing the structural integrity of a light sport aircraft design. The task includes the application for LSA status under the RAAus and CASA. Work at your own pace. Sydney based.

     

    Please contact Ray on 0414 559742

     

     

  10. Yeah Bruce, where to start!

     

    Some people sand with 40# sandpaper. I think this cuts too deeply into the fibres. I use 60# white freecut paper.

     

    Keep changing the paper as the mould release spreads easily with old sandpaper. Use new paper for final cuts.

     

    Using the oblique light will show up shiny spots but they may have been sanded enough! 80% visible matt finish

     

    is enough. You will see what I mean when you do it.

     

    Make sure the glass is DRY when you laminate it! Some people even heat it gently in a heat box before use. The

     

    "finish" on the glass fibres is water soluble and it is the only thing the resin sticks to ( it doesn't actually stick to the

     

    fibres of glass)!

     

    7781 Glass is a very tight weave so you will probably roll the resin sideways in the moulded joggle. Run a line of

     

    masking tape each side of the joggle so you can clean up to the edge, outside of that I just use acetone.

     

    Buy some white Vinegar and wash your hand with it after cleaning up. Reduces risk of allergic reaction.

     

     

    • Like 1
×
×
  • Create New...