Spring Gear: Bolt Hole Placement
Posted: Fri Feb 17, 2012 5:26 pm
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Date: Tue, 07 Sep 1999 16:26:17 +0000
From: Dan Morehouse <danmorehouse@webcombo.net>
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Subject: Spring Gear: Bolt Hole Placement
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Hi!
I measured the distance from the center of the forward outside bolt
hole in SG13 to the edge of my tapered front carrythrough, where the
hole would be drilled. This was ~7/16". Normally, shouldn't the bolt to
edge distance be 2D, like with rivets? Assuming this that would give me
5/8" for the 5/16" bolt or 3/4" for Alister's upgraded 3/8" bolts.
Do I not worry since the edge is not in a direct stress plane or do I
move the bolt holes away from the edge? If I have to move, I've got few
options. Moving them perpendicular to the carrythrough toward the
upright gets more edge distance since less of the carrythrough has been
shaved off. But that would mean drilling through the spring gear SG1
itself. Not good.
Moving the bolt toward the center along the radius of the carrythrough
gives more edge distance but runs closer to the bolts connecting the two
carrythroughs, running 90 degrees to them. This brings about another
question.
Even if I don't move the bolts toward the center along the carrythrough
they would pass ~1/4" away from these carrythrough connecting bolts.
Would this bother anyone, especially those that would fly with me?
And as long as I am talking about edge distances with bolts I've notice
that SG5, the spacer block, 1 1/2 x 1 3/8. Murphy's 3/8" bolt would
require 3/4", so the 11/2" direction would just barely fit ane the 1
3/8" direction would be a bit short. Again, stress direction might void
these requirements. Upgrading to New Zealand's 7/16" bolt would make
things even tighter. What did you do Alister?
Thanks for your guidance,
Dan
R280
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Date: Tue, 07 Sep 1999 16:26:17 +0000
From: Dan Morehouse <danmorehouse@webcombo.net>
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Subject: Spring Gear: Bolt Hole Placement
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Hi!
I measured the distance from the center of the forward outside bolt
hole in SG13 to the edge of my tapered front carrythrough, where the
hole would be drilled. This was ~7/16". Normally, shouldn't the bolt to
edge distance be 2D, like with rivets? Assuming this that would give me
5/8" for the 5/16" bolt or 3/4" for Alister's upgraded 3/8" bolts.
Do I not worry since the edge is not in a direct stress plane or do I
move the bolt holes away from the edge? If I have to move, I've got few
options. Moving them perpendicular to the carrythrough toward the
upright gets more edge distance since less of the carrythrough has been
shaved off. But that would mean drilling through the spring gear SG1
itself. Not good.
Moving the bolt toward the center along the radius of the carrythrough
gives more edge distance but runs closer to the bolts connecting the two
carrythroughs, running 90 degrees to them. This brings about another
question.
Even if I don't move the bolts toward the center along the carrythrough
they would pass ~1/4" away from these carrythrough connecting bolts.
Would this bother anyone, especially those that would fly with me?
And as long as I am talking about edge distances with bolts I've notice
that SG5, the spacer block, 1 1/2 x 1 3/8. Murphy's 3/8" bolt would
require 3/4", so the 11/2" direction would just barely fit ane the 1
3/8" direction would be a bit short. Again, stress direction might void
these requirements. Upgrading to New Zealand's 7/16" bolt would make
things even tighter. What did you do Alister?
Thanks for your guidance,
Dan
R280