Water Rocket Bottle Splicing by air.command

Step 4:

BottleSplicing_07_s.jpg
BottleSplicing_08_s.jpg
Cut off the base of all 4 bottles and trim the edge evenly and square.

You can use the edge of the straight section as a guide to cut the bottle evenly. Make sure you don't leave a small flange around the edge when you cut the bottom off.
 
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