To access the eye that you've epoxied into the top centering ring on your motor mount to attach your recovery harness to,,, your choices are--------
In descending order of my preference----------
1--- Get your neighbors 10 year old daughter Megan to reach down into the booster with her tiny hands.........
2--- Get your wife ( usually requires some sort of bribery )
to reach down into the booster with her small
and much more capable hands.........
3--- Cut the booster off above the motor mount as high
as you need for a coupling shoulder....
( A fiber blade for your chop [ compound miter ] saw
will make a perfectly square cut on the tubing effortlessly,,
and is extremely inexpensive at any of the home improvement chains.. ) ....
For example,, on a 3" airframe you'd want at least 3" of shoulder on any coupling,, so you must get a coupling at least 6" long.. Your cut over the motor mount must leave at least 3" or 3 1/2" to be safe of airframe tubing above the top centering ring for the coupling to slip into over the eye...
Place the coupling halfway into ( halfway in,, or 3" in for a 6" long coupling in a 3" airframe. ) the cut off section of airframe tubing ( the section that's above the cut ) and temporarily fix in place with 3-- 2/56" screws 120 degrees apart,, inline with the fins,, to be epoxied permanently later..
Slip the coupling / airframe tube assembly back in to the booster right where you cut it from,, drill and tap for 3-- 2/56" screws 120 degrees apart inline with the fins,, make witness marks as you disassemble so you know rotationally which way it goes back together,, and remove the top section.. Now you have access to epoxy blind nuts or pem nuts or Tee nuts one at a time on the inside of the booster / coupler at the lower side of the joint's 3 holes.. After the nuts are epoxied in place and hard,, remove the top 3 -- 2/56" screws and permanently epoxy the coupling into the top section of airframe tubing.. Now when you assemble the now 2 piece booster
your screwing a steel screw into a steel thread....
You can't get any stronger then that...
Solid as a rock when assembled,,,
Complete easy access to the eye for harness replacement or maintenance...........
Teddy
In descending order of my preference----------
1--- Get your neighbors 10 year old daughter Megan to reach down into the booster with her tiny hands.........
2--- Get your wife ( usually requires some sort of bribery )
to reach down into the booster with her small
and much more capable hands.........
3--- Cut the booster off above the motor mount as high
as you need for a coupling shoulder....
( A fiber blade for your chop [ compound miter ] saw
will make a perfectly square cut on the tubing effortlessly,,
and is extremely inexpensive at any of the home improvement chains.. ) ....
For example,, on a 3" airframe you'd want at least 3" of shoulder on any coupling,, so you must get a coupling at least 6" long.. Your cut over the motor mount must leave at least 3" or 3 1/2" to be safe of airframe tubing above the top centering ring for the coupling to slip into over the eye...
Place the coupling halfway into ( halfway in,, or 3" in for a 6" long coupling in a 3" airframe. ) the cut off section of airframe tubing ( the section that's above the cut ) and temporarily fix in place with 3-- 2/56" screws 120 degrees apart,, inline with the fins,, to be epoxied permanently later..
Slip the coupling / airframe tube assembly back in to the booster right where you cut it from,, drill and tap for 3-- 2/56" screws 120 degrees apart inline with the fins,, make witness marks as you disassemble so you know rotationally which way it goes back together,, and remove the top section.. Now you have access to epoxy blind nuts or pem nuts or Tee nuts one at a time on the inside of the booster / coupler at the lower side of the joint's 3 holes.. After the nuts are epoxied in place and hard,, remove the top 3 -- 2/56" screws and permanently epoxy the coupling into the top section of airframe tubing.. Now when you assemble the now 2 piece booster
your screwing a steel screw into a steel thread....
You can't get any stronger then that...
Solid as a rock when assembled,,,
Complete easy access to the eye for harness replacement or maintenance...........
Teddy