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  1. H

    Okay, new discussion: welding

    MIG is clean , soft weld . Its an industrial process , thus fast and low cost . 1.5" diam' by .032" steel DOM tubes (100 kips ) brazed into 1/16" thick , hand forged lugs , against steel dies . Examine an old expensive bike frame . Lugs are MIG'd , then cold worked , then shaped by...
  2. H

    Drill Size For Dimpled -4 Rivet Holes

    Its not "structural" to use 3/32 AD rivets in .032 . You must use a "ratio" of rivet diameter to skin thickness. You cant simply increase the number of rivets . I will do some wing spars with .080 , it can use 5/32 AD's or 3/16 ..but not 1/8" AD's . In the late 60's , i did some stretched...
  3. H

    sheet alu. skin over solid foam core?

    Can you pressurize the skin with air ? Can you force sound posts under skin , like a violin ? Styrene + Toulene (aka Methyl-benzene). I did some simple tubes with polyester cloth and liquid styrene ( from foam ) . It was impressively light weight and very strong/stiff...
  4. H

    Tube framing software...

    Spreadsheet software . write your own CAD . -------------- I will be making some frames using bicycle methods . 100,000 PSI CRS steel tubes ,brazed into steel lugs . Bicycle frames dont break , brazing is more reliable than TIG . Im buying Yamaha R1 engines . wt is 120 lbs ...
  5. H

    Bicycle tube and lug construction

    small lathe bores/cleans up holes to fit steel tubes , then braze with dbl headed torch . Its the best technology for airplanes . So why not use it ? MIG the lugs then grind them and bore them . you can CRS them , work harden them . 100,000 psi steel tubes , brazed into lugs ...
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