----[Please read http://ercoupers.com/disclaimer.htm before following any advice in this forum.]---- Hal,
Good info in Fred Weick's Bio, "From the Ground Up". On page 166, 167, etc., Fred describes his trip to Europe to investigate production of Schwarz props from the Germans and from the English ( Airscrews, Ltd.). Erco had been making and selling machinery for aircraft production, but had to trade /swap with the Germans for payment....They got the Schwarz Prop liscense in exchange for equipment sold. "The Schwarz blade consisted essentially of a main core of laminated spruce or other light wood, which merged into a root of impregnated and compressed hardwood know to us as "compreg". "The compreg root was threaded and screwed into a steel ferule that supported the blade in the hub." "The remainder of the blade was covered completely with a heavy coating of reinforced cellulose acetate sheet, whose leading edge was armored with a flush strip of metal."...... "These propellers are described in detail in a paper entitled "Composite Wood and Plastic Propeller Blades", that I gave at the annual meeting of the SAE in 1939, and that was printed in the SAE Journal in June, 1939." (SAE Transactions. Paper presented at SAE meeting, Detroit, MI, Jan 9-13, 1939) The main advantage of the Schwarz propellers lay in their light weight, as compared with the large aluminum alloy propellers which at that time were being used with the most powerful reciprocating engines." Hope you can find a copy to read, and also research Fred Weick's papers in SAE Journals... REgards, Harry Francis Blacksburg, VA. ==^================================================================ EASY UNSUBSCRIBE click here: http://topica.com/u/?bz8Sid.bAhN69 Or send an email To: [EMAIL PROTECTED] This email was sent to: [EMAIL PROTECTED] T O P I C A -- Register now to manage your mail! http://www.topica.com/partner/tag02/register ==^================================================================
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