Pietenpol-List: Oscar's engine mount lengthening-- 2 3/4" further forward
Posted: Mon Jun 29, 2009 8:49 am
Original Posted By: AMsafetyC(at)aol.com
Subject: Pietenpol-List: Oscar's engine mount lengthening-- 2 3/4" further forwardthan plans Oscar-- I find it really interesting that you discovered your 41CC engine mountis 2 3/4" longer than plans. My guess is that your wing is positioned maybe1-2" "slant-back" from your cabanes being vertical no ?With my motor mount I intentionally made it 1" longer than plans because I'm 200lbsand didn't want to have to slant the wing way, way back to get the CG numbers toworkout. As it turned out my wing is 4" aft of the cabane struts in the perfect verticalorientation. Steve E. from Utah (best I can recall) had his wing back SIX inchesto make his CG turn out right. Nothing wrong with that but longer motor mountsdofor the Cont. 65 does keep builders from having to position the wing back veryfar. (that's why GN-1's noses look so long--because they are. The reason they are solongis that the wing on a GN-1 is NOT repositionable fore and aft with the way theydesignedthe GN-1 cabane fittings. If your CG comes out wrong on a GN-1 you just can'tmove thewing fore or aft to fix it-- you have to build a new motor mount or add lead somewhere!!!!Mike C. ________________________________________________________________________________
Subject: Pietenpol-List: Oscar's engine mount lengthening-- 2 3/4" further forwardthan plans Oscar-- I find it really interesting that you discovered your 41CC engine mountis 2 3/4" longer than plans. My guess is that your wing is positioned maybe1-2" "slant-back" from your cabanes being vertical no ?With my motor mount I intentionally made it 1" longer than plans because I'm 200lbsand didn't want to have to slant the wing way, way back to get the CG numbers toworkout. As it turned out my wing is 4" aft of the cabane struts in the perfect verticalorientation. Steve E. from Utah (best I can recall) had his wing back SIX inchesto make his CG turn out right. Nothing wrong with that but longer motor mountsdofor the Cont. 65 does keep builders from having to position the wing back veryfar. (that's why GN-1's noses look so long--because they are. The reason they are solongis that the wing on a GN-1 is NOT repositionable fore and aft with the way theydesignedthe GN-1 cabane fittings. If your CG comes out wrong on a GN-1 you just can'tmove thewing fore or aft to fix it-- you have to build a new motor mount or add lead somewhere!!!!Mike C. ________________________________________________________________________________