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galinhdz(at)gmail.com
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 Posted: Fri Nov 20, 2015 2:58 pm Post subject: Main Gear Attach Bolt Torque |
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I finally have the main gear attach point repairs completed and am bolting everything together. However I can't find what I should torque the bolts to. I know AN7 bolts are torqued to a maximum of 50 ft/lb but that is maximum.
The attach points have 20 plies of glass, 2 plies of carbon, the rubber pads and a 3/16" steel plate along with the aluminum saddle. Any recommendations on how many ft/lbs of torque I should apply?
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flyinisfun90(at)gmail.com
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| Posted: Fri Nov 20, 2015 5:56 pm Post subject: Main Gear Attach Bolt Torque |
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Galin,
Before you torque any of those bolds, be sure you have filled all the space inside the wing spar box. Any torching on these bolts you want to keep in mind that you are pulling against fiberglass so the number will not be anywhere close to what it would be if it were metal. To fill the gap inside the box, I made some washer with handles. The handles were about about 4 inches long cut out of 3/16 aluminum material to shove up in the wing box to fill the gap. The handles were so I could shove then up in place until I could push the bolt through. Don't worry about the handles, just turn them side ways, out of the way when the bolts are tightened. My wing took about 4 for each side of the fuselage, two in front of the wing spar and 2 in the rear of the wing spar. Leave plenty of face on the washer surface so you can apply a little pressure on the torque and not pull then into the box material. The torque I used on my was -- snug the nut to the material and about a half turn more. Remember, bolts go in from the front with either castle nuts or elastic nuts. I used elastic nuts on mine. Also don't overlook the 1/4 gap spacing on the top of the spar, between the spar and the fuselage box. Good cruising. I'm sure others will have thoughts on this.
Jesse
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flyinisfun90(at)gmail.com
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| Posted: Fri Nov 20, 2015 6:02 pm Post subject: Main Gear Attach Bolt Torque |
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Galin,
Before you torque any of those bolds, be sure you have filled all the space inside the wing spar box. Any torching on these bolts you want to keep in mind that you are pulling against fiberglass so the number will not be anywhere close to what it would be if it were metal. To fill the gap inside the box, I made some washer with handles. The handles were about about 4 inches long cut out of 3/16 aluminum material to shove up in the wing box to fill the gap. The handles were so I could shove then up in place until I could push the bolt through. Don't worry about the handles, just turn them side ways, out of the way when the bolts are tightened. My wing took about 4 for each side of the fuselage, two in front of the wing spar and 2 in the rear of the wing spar. Leave plenty of face on the washer surface so you can apply a little pressure on the torque and not pull then into the box material. The torque I used on my was -- snug the nut to the material and about a half turn more. Remember, bolts go in from the front with either castle nuts or elastic nuts. I used elastic nuts on mine. Also don't overlook the 1/4 gap spacing on the top of the spar, between the spar and the fuselage box. Good cruising. I'm sure others will have thoughts on this as well.
On Fri, Nov 20, 2015 at 6:56 PM, Jesse Wright <flyinisfun90(at)gmail.com (flyinisfun90(at)gmail.com)> wrote:
| Quote: | Galin,
Before you torque any of those bolds, be sure you have filled all the space inside the wing spar box. Any torching on these bolts you want to keep in mind that you are pulling against fiberglass so the number will not be anywhere close to what it would be if it were metal. To fill the gap inside the box, I made some washer with handles. The handles were about about 4 inches long cut out of 3/16 aluminum material to shove up in the wing box to fill the gap. The handles were so I could shove then up in place until I could push the bolt through. Don't worry about the handles, just turn them side ways, out of the way when the bolts are tightened. My wing took about 4 for each side of the fuselage, two in front of the wing spar and 2 in the rear of the wing spar. Leave plenty of face on the washer surface so you can apply a little pressure on the torque and not pull then into the box material. The torque I used on my was -- snug the nut to the material and about a half turn more. Remember, bolts go in from the front with either castle nuts or elastic nuts. I used elastic nuts on mine. Also don't overlook the 1/4 gap spacing on the top of the spar, between the spar and the fuselage box. Good cruising. I'm sure others will have thoughts on this.
Jesse
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