Pietenpol-List: CG locations of passenger and pilot

[matronics]

Original Posted By: Isablcorky(at)aol.com
Corky,How did you determine the CG locations of the passenger seat and pilot seat.The old rule is that you use the location of the navel as the CG of a personsitting. This is why weighing empty and then later with someone in the seatlets you mathemtically determine an EXACT location for the occupants' CGloation. These planes are so light that little errors like this really skewthe results. My initial review indicates that we are way tail heavy andgetting tail heavier as we add a passenger and that is what prompts thisquestion.I would guess that the navel would occupy a point about 1" aft of theleading edge of each seat. I am looking at the 1932 F & G plans and withthe fron cabane strut straight vertical to the upper longeron, an eyeballguess is 19" aft for the front seat and 51 inches aft for the back seat.What fuselage did you use?chris________________________________________________________________________________

[matronics]

Original Posted By: "Christian Bobka"
Subject: Re: Pietenpol-List: CG locations of passenger and pilotChris,Thanks again for this effort.I have the short 1933 fuse. I did use the belly button position for bodies. 21 inches for the passenger and 53 for the pilot.CMC________________________________________________________________________________

[matronics]

Original Posted By: owner-pietenpol-list-server(at)matronics.com
Looks good then although I would change the ship a bit as testing movesalong. Let me know what you think of what follows. I will stay up all niteif I have to.Chris-----Original Message-----