murlin trebuchet

Murderin’ Murlins MURLIN Trebuchet

Project Managers: Quinn, Dylan, Avra http://murderinmurlins.weebly.com/ 

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Page 2: Bill of materials (list absolutely every item that you think you may need and its approximate cost): Item

# of Items

$ per Item

Total

Static rope

40 ft

$0.80

$32

Quikrete Cement

160 lbs

$3.93 (per 80 lbs)

$7.86

2” Wood Screws

150

$0.11

$16.94

2”x4”x96” Framing

10

$2.83

$28.30

1

$12.74

$12.74

Cerro 3/4 in. x 10 ft. Copper Type L Hard Temper Straight Pipe

1

$24.65

$24.65

Lehigh 3/8 in. x 4-1/2 in. Stainless-Steel Screw Eye Bolt

4

$3.28

$13.12

3/8 in. x 10 in. (or longer...) Zinc-Plated Hex Bolt

5

$2.33

$11.65

CW garage door pulleys

2

$15.77

$31.54

Main Axle Bearings

2

$7.46

$14.92

Liquid Nails 28-oz. Heavy Duty Construction  Adhesive

2

$4.98

$9.96

25' of 5mm Spectra Rope

25

$1.25

$31.25

 A 250 foot roll of 200# kevlar line

1

$11

$11

$13.99

$13.99

lumber  2”x12”x96” Framing

lumber 

900 lb. test kevlar line 1

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Page 3: Sketch of your your device TO SCALE!

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Page 4: Your proposed building/design process and your approximate time frame for completion of each step:

N/A

9/21

9/28

10/5

10/12

10/19

10/26

9/15

9/16

9/17

9/18

9/19

Finish project proposal

Begin creating model of trebuchet

Model work

Model work

Finish model

9/22

9/23

9/24

9/25

9/26

Put together calculations and final designs for trebuchet

Put together calculations and final designs for trebuchet

Dave yapping

Finish final designs and calculations

Finish final designs and calculations

9/29

9/30

10/1

10/2

10/3

Start building Build

Build

Build

Build

10/6

10/7

10/8

10/9

10/10

Build

Build

Build

Build

Build

10/13

10/14

10/15

10/16

10/17

Preliminary tests and refinement

Build

Build

Build

Build

10/20

10/21

10/22

10/23

10/24

Test

Test

Test

Refine

Refine

10/27

10/28

10/29

10/30

Refine

Make it look good/exhibiti on prep

Launch Be finished stuff/exhibi tion prep

9/20

9/27

10/4

10/11

10/18

10/25

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Page 5: A list of preliminary calculations and equations that you may need to optimize trajectory/success:

The acceleration of the counterweight M  is:  is:

(http://www.real-world-physics-problems.com/trebuchet-physics.html )

Other equations/formulas that will be used: ● Transfer of energy ● Arm velocity ● Release Velocity ● Total CW Drop