Brodhead Pietenpol Association

Original Posted By: Howard Wilkinson
List: Still being a bit concerned about the W & B of my GN-1 (A tad tailheavy on paper), I'm considering moving the engine forward about 1". Thisseems like it can be done with the existing engine mount, and using spacersbetween the engine mount and the firewall. Only thing necessary to changeis the length of the engine mount/firewall bolts. All cables, wiring,hoses, etc are long enough for the move.Question: If the planes empty CG (no fuel, but with oil in the con. 65) is16.2" right now, how can I calculate where the empty CG will be if I movethe engine forward 1"? The GN-1 empty weight is 665 lbs, but taking onehalf of this figure and trying to scoot it forward doesn't work. Anotherformula perhaps?Robert Hensarling GN-1 N83887http://www.mesquite-furniture.comrhrocker(at)admin.hilconet.comUvalde, Texas________________________________________________________________________________

Original Posted By: Ken Beanlands
You could tack weld some electrical conduit (careful it's usuallygalvanized) to create a test motor mount. If the CG isn't whereyou want it cut out some material or knock together another.When it's right, do the real thing from your final testmeasurements.Mike BellColumbia, SC (& part time Reston Va.)robert hensarling on 06/06/9911:01:15 AMPlease respond to Pietenpol Discussion cc:Subject: Pietenpol-List: more balanceList: Still being a bit concerned about the W & B of my GN-1 (Atad tailheavy on paper), I'm considering moving the engine forward about1". Thisseems like it can be done with the existing engine mount, andusing spacersbetween the engine mount and the firewall. Only thing necessaryto changeis the length of the engine mount/firewall bolts. All cables,wiring,hoses, etc are long enough for the move.Question: If the planes empty CG (no fuel, but with oil in thecon. 65) is16.2" right now, how can I calculate where the empty CG will beif I movethe engine forward 1"? The GN-1 empty weight is 665 lbs, buttaking onehalf of this figure and trying to scoot it forward doesn't work.Anotherformula perhaps?Robert Hensarling GN-1 N83887http://www.mesquite-furniture.comrhrocker(at)admin.hilconet.comUvalde, Texas________________________________________________________________________________