From: Bannister, Wade [wbannist@smtp3.wstf.nasa.gov]
Sent: Tuesday, March 19, 2002 8:09 AM
To: webmaster@ihpva.org
Subject: CAD library page

Hello,
	You asked for some folks that had posted files to /incoming to claim authorship, so wadetandem.jpg is mine.  This is a basic tandem recumbent design - the frame is a straight 2"OD tube, wheels are dual 20", head angle is 80 degrees with 3.8" of trail ( based on calculations from the Lords of the Chainring class materials).  The rear triangle is cut from a bmx frame by running a holesawing the seattube out of the middle and keeping the triangle - I note that I was left with a remainder of the BB shell to help improve lateral strength at the frame joint.  All auxiliary parts braze to bases made from 1/3 arc sections cut from 2" tube and slightly flattened to match their ID to the frame OD.  Bases clamp to the frame via T-bolt clamps.

Included with the basic frame layout are the much more detailed plans for the seat backs.  At the bottom you will find a geometric tool for estimating heel clearances.  If your legs are much different from mine it would behoove you to alter that a bit, but at least I wrote in the dimensions so you can tell.