10. Draw the profile of one fin

• Select the Line tool
• Start at the bottom, in the middle of the cylinder, and draw the profile of one fin
• The exact fin shape can be up to you!
• Your fin should have these properties though:
  • A flat bottom
  • About as wide/tall as these fins

11. Extrude the fin in both directions

• Select the extrude tool
• Click on Add to add to your part instead of creating a new part
• Set the Depth to 0.05 in
• Check Second end position
• Set the second Depth to 0.05 in
• Click the green check

12. Add fillets to smooth out the fin profile

• What is a fillet? »
• Fillet: “a rounding of an interior or exterior corner of a part design.”
• Select the fillet tool
• Click the edges on the left, right, top near the body, and top on the fin
• Set the radius to 0.4
• Click the green check

13. Add fillets to the fin edges

• Select the fillet tool
• Set the radius to 0.05
• Click the two edges of the fin
• Click the green check

14. Circular pattern the fins

• We have one fin, but we really want 3 fins around in a circular pattern.
• Select the circular pattern tool
• 
• Select a Feature Pattern from the drop down menu
• 
• In the left pane, click on Features to pattern and then select Extrude 2 (the extrude for the fins) and the two fillets we just did
• 
• Select Axis of pattern, and then click the the cylinder
• 
• Chance the Instance count to 3
• 
• Check Apply per instance
• 
• Click the green check

15. Create a sketch on top of the cylinder

• What we want to do next is clear out the middle of the cylinder, and so we'll make a new sketch to help us get there
• Select the sketch tool
• Click on top of the cylinder
• Notice how a new sketch plane is now on top of the cylinder

16. Use the "Use" tool to get the inner circle in this sketch

• Select the use tool
• Select the inner circle of the body
• To help see what this has done, hide the 3D part
• Unhide the part

17. Extrude cut away the inside of the cylinder

• Select the Extrude tool
• Select Remove to take away rather than add material
• Where it says Blind, change it to Through all
• Click the green check
• Notice how the inside of the cylinder is now perfectly empty
• Cylinder not empty? »
• 
• There's a good chance that your direction was mixed up
• Double click on Extrude 3
• Click the "opposite direction" button
• 
• Also check that in the Merge scope box, you see "Part 1"
• If not, click the Merge scope box and then click the rocket

Fins + Booster Tutorial
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