19. Draw the launch lug's inner circle

• Select the circle tool
• Draw a circle outside the rocket. Be sure to snap the circle's center to the centerline.
• Select the dimension tool
• Click the circle and set its diameter to 0.165

20. Dimension the circle's distance

• Select the dimension tool
• Click the circle, then click the edge of the rocket
• Move your mouse so that the dimension is along the vertical
• Set the dimension to 0.06
• Did you notice how the circle turned black? »
• Black lines mean, “fully defined,” which means that you have told Onshape exactly where the line is.
• If a line is blue, it means that there are still things to be constrained or dimensioned.

21. Draw the outer section of the launch lug

• Select the circle tool
• Draw a larger circle centered on the existing circle
• Use the dimension tool to set its diameter to 0.216

22. Draw the launch lug connectors

• Select the 3-point arc tool
• Set the first point on the circle
• Set the second point on the rocket body
• Set the third point so that the arc bends inwards.
• Repeat for the other side

23. Constrain the launch lug connectors

• First select:
• Top two points on your arcs
• The circles' center.
• Then select the "Horizontal" tool
• You should see all three points line up

24. Add the rocket's side to your sketch

• Select the Use (Project/Convert) tool
• Select the arc on the edge of the rocket
• You should see that arc bold as it becomes part of your sketch

25. Connect the launch lug to the rocket

• Select the "Coincident" tool
• Select the point on the bottom of one of your arcs and the edge of the arc on the rocket
• Repeat the coincident step for the second arc

26. Constrain the launch lug sides

• Select the left arc and the outer circle
• Select the "Tangent" tool
• You should see the arc jump to become tangent and turn black as becomes fully constrained
• Repeat for the right-side arc

27. Finish the launch lug sketch

• Select the trim tool
• Trim the bottom of the outer circle

28. Extrude the launch lug

• Select the extrude tool
• Your sketch will automatically be selected
• Click the Add option
• If needed, click the "Opposite direction" button to make the launch lug extrude along your rocket
• Set the "Depth" to 1.2
• Click the green check

29. Fillet the launch lug

• Select the "Fillet" tool
• Click the arc on the inside arc of launch lug
• Set the "Radius" to 0.2
• Click the green check

30. Fillet the launch lug (2)

• Select the "Fillet" tool
• Left and right edges of the launch lug, near the body
• Set the "Radius" to 0.1
• Click the green check

Fins + Booster Tutorial
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