Original Posted By: Bryce Reid
There IS a reason for the datum to be forward of the aircraft. This is particularlytrue for transport category. Most are swept wing so leading edge of thewing is meaningless. Same with other commonly used GA ones like firewall, propflange and so on. Since location of the datum is completely arbitrary, mostbig aircraft use a point in front of the plane. That way, all of the arms arepositive and the math is slightly simpler when changing things like radomesthat might be forward of, say, a front bulkhead datum.FWIW, the original Piper factory paperwork for our J-3 shows TWO datums -- theleading edge of the wing and the prop flange, though most people use the leadingedge.DaveRead this topic online here:http://forums.matronics.com/viewtopic.p ... ___Subject: Pietenpol-List: Steel tube Pietenpol for sale $1800
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