Original Posted By: mboynton(at)excite.com
Need some advice before I cut up my beautiful douglas fir for the tailfeathers. When looking at the end of the horizontal tail beams, whichway should the grain be oriented? Seems like for best bending strengththe grain should be vertical, like the rib capstrips, which would begood for the hinge bolts to run through. But for the tail brace wirelug bolts it would be better with the grain horizontal. My plans aren'treal clear on this, nor are any of the other wood aircraft design booksI have. Help, have to cut up this fir before the wife makes plans forit!Mike List________________________________________________________________________________
Pietenpol-List: Grain Orientation
Pietenpol-List: Re: Grain Orientation
Original Posted By: Greg Cardinal
To all:Which way will the wood be strongest? I thought the orientation of the ribcapstrips was supposed to be horizontal, or perpendicular to the forcesacting on them in the air (parallel to the ground as the plane is standingon it). Have I got it wrong?Mark BoyntonPhoenix, AZ> Need some advice before I cut up my beautiful douglas fir for the tail> feathers. When looking at the end of the horizontal tail beams, which> way should the grain be oriented? Seems like for best bending strength> the grain should be vertical, like the rib capstrips, which would be> good for the hinge bolts to run through. But for the tail brace wire> lug bolts it would be better with the grain horizontal. My plans aren't> real clear on this, nor are any of the other wood aircraft design books> I have. Help, have to cut up this fir before the wife makes plans for> it!> > Mike List________________________________________________________________________________
To all:Which way will the wood be strongest? I thought the orientation of the ribcapstrips was supposed to be horizontal, or perpendicular to the forcesacting on them in the air (parallel to the ground as the plane is standingon it). Have I got it wrong?Mark BoyntonPhoenix, AZ> Need some advice before I cut up my beautiful douglas fir for the tail> feathers. When looking at the end of the horizontal tail beams, which> way should the grain be oriented? Seems like for best bending strength> the grain should be vertical, like the rib capstrips, which would be> good for the hinge bolts to run through. But for the tail brace wire> lug bolts it would be better with the grain horizontal. My plans aren't> real clear on this, nor are any of the other wood aircraft design books> I have. Help, have to cut up this fir before the wife makes plans for> it!> > Mike List________________________________________________________________________________
Pietenpol-List: Re: Grain Orientation
Original Posted By: "Smith, Randy"
It doesn't matter in this situation since you have holesdrilled both vertically and horizontally. Just followTony Bingellis' recommendations regarding use ofwashers and plywood under nuts and bolt heads tospread out the clamping forces.Greg Cardinal>>> michael list 02/19 3:12 AM >>>Need some advice before I cut up my beautiful douglas fir for the tailfeathers. When looking at the end of the horizontal tail beams, whichway should the grain be oriented? Seems like for best bending strengththe grain should be vertical, like the rib capstrips, which would begood for the hinge bolts to run through. But for the tail brace wirelug bolts it would be better with the grain horizontal. My plans aren'treal clear on this, nor are any of the other wood aircraft design booksI have. Help, have to cut up this fir before the wife makes plans forit!Mike List________________________________________________________________________________
It doesn't matter in this situation since you have holesdrilled both vertically and horizontally. Just followTony Bingellis' recommendations regarding use ofwashers and plywood under nuts and bolt heads tospread out the clamping forces.Greg Cardinal>>> michael list 02/19 3:12 AM >>>Need some advice before I cut up my beautiful douglas fir for the tailfeathers. When looking at the end of the horizontal tail beams, whichway should the grain be oriented? Seems like for best bending strengththe grain should be vertical, like the rib capstrips, which would begood for the hinge bolts to run through. But for the tail brace wirelug bolts it would be better with the grain horizontal. My plans aren'treal clear on this, nor are any of the other wood aircraft design booksI have. Help, have to cut up this fir before the wife makes plans forit!Mike List________________________________________________________________________________
Pietenpol-List: Re: Grain Orientation
Original Posted By: Dean Dayton
Normally capstrips have their grain oriented vertically so the gusset nails,or staples in my case, do not tend to split the capstrip. Of course ifyou're using a glue-up jig without nails, it doesn't really matter.Regards,Randy S.-----Original Message-----Sent: Friday, February 19, 1999 8:50 AMSubject: Pietenpol-List: Re: Grain OrientationTo all:Which way will the wood be strongest? I thought the orientation of the ribcapstrips was supposed to be horizontal, or perpendicular to the forcesacting on them in the air (parallel to the ground as the plane is standingon it). Have I got it wrong?Mark BoyntonPhoenix, AZ> Need some advice before I cut up my beautiful douglas fir for the tail> feathers. When looking at the end of the horizontal tail beams, which> way should the grain be oriented? Seems like for best bending strength> the grain should be vertical, like the rib capstrips, which would be> good for the hinge bolts to run through. But for the tail brace wire> lug bolts it would be better with the grain horizontal. My plans aren't> real clear on this, nor are any of the other wood aircraft design books> I have. Help, have to cut up this fir before the wife makes plans for> it!> > Mike List________________________________________________________________________________
Normally capstrips have their grain oriented vertically so the gusset nails,or staples in my case, do not tend to split the capstrip. Of course ifyou're using a glue-up jig without nails, it doesn't really matter.Regards,Randy S.-----Original Message-----Sent: Friday, February 19, 1999 8:50 AMSubject: Pietenpol-List: Re: Grain OrientationTo all:Which way will the wood be strongest? I thought the orientation of the ribcapstrips was supposed to be horizontal, or perpendicular to the forcesacting on them in the air (parallel to the ground as the plane is standingon it). Have I got it wrong?Mark BoyntonPhoenix, AZ> Need some advice before I cut up my beautiful douglas fir for the tail> feathers. When looking at the end of the horizontal tail beams, which> way should the grain be oriented? Seems like for best bending strength> the grain should be vertical, like the rib capstrips, which would be> good for the hinge bolts to run through. But for the tail brace wire> lug bolts it would be better with the grain horizontal. My plans aren't> real clear on this, nor are any of the other wood aircraft design books> I have. Help, have to cut up this fir before the wife makes plans for> it!> > Mike List________________________________________________________________________________