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Lightweight
Motor Retainer
Bradley's first high power rocket used the base of a Coors
Beer Can for the motor retainer. I decided on a similar solution
for the Evil
Grimace, but the base diameter was much smaller than most
beverage cans. So I went on can collection expedition at my local
grocery store and came home with several promising options. After
trying a few, and getting totally juiced up on Red Bull, and
other food stuff that comes in little cans, I determined
that the best option is the can from Armour Potted Meat product,
Or SPAM sandwich spread.
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Here are the ingredients for potted
meat product:
| Ingredients:
Mechanically Separated Chicken, Beef Tripe,
Partially Defatted Cooked Beef Fatty Tissue, Beef
Hearts, Water, Partially Defatted Cooked Pork
Fatty Tissue, Salt. Less than 2 percent: Mustard,
Natural Flavorings, Dried Garlic, Dextrose,
Sodium Erythorbate, Sodium Nitrite |
Less than 2% Natural flavor. Hmmmmmmmmmmmm
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| The difference between Spam and Armor Potted meat is
that the Spam can is a gold irridite color, while the
Armour is buffed aluminum, so decor of your rocket may
dictate your choice Armor is also a few cents cheaper,
and seems to be easier to evacuate down the garbage
disposal, which is a real plus. |
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Instructions:
- Open Can
- Discard contents. Warning!
Do Not Eat!
- Clean can thoroughly. be careful not to get any of it on
you.
- Cut off the bottom of the can, leaving a about .25"
of the can wall
- How, this is dependent of the methods you have
available, but I set a dremel tool cut-off wheel
in my drill press, and brought the drill table up
so that the cut off wheel will cut off the bottom
of the can leaving .25" of side wall.
- Set the can open end down on the drill table
- Turn on the drill press, firmly but slowly plunge
can into the cutoff wheel until the mandrel shank
touches the can. Slowly rotate the can while
firmly holding it until the bottom is complete
cut off.
- Determine the center of the can bottom
- using a 1" spade bit, (not
in a drill, do this by hand) place
point on center of bottom, press and twist, and
let the point cut through the can, continue until
the teeth cut through can bottom.
- locate your screw mounting holes and drill.
- Finished!
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