Presentation is loading. Please wait.

Presentation is loading. Please wait.

Trebuchet Basics Fritz R. Fiedler. Basic Sling Trebuchet.

Similar presentations


Presentation on theme: "Trebuchet Basics Fritz R. Fiedler. Basic Sling Trebuchet."— Presentation transcript:

1 Trebuchet Basics Fritz R. Fiedler

2 Basic Sling Trebuchet

3 Example Frame

4 Example Beam

5 Example Tip Detail

6 Release

7 Trigger

8 Sling

9 Basic Trebuchet

10

11 The Throw

12 Definitions v 0  h

13 Energy Equations

14 Range

15 Efficiency What affects efficiency and what would you expect the actual efficiency to be?

16 Efficiency Does not include effects of: mass of beam friction air resistance …? Efficiency ~ 50% or less (compute for report!) so R m < hm 1 / m 2 )

17 Required Information h : by design m 1 : by design m 2 : given

18 Projectile 3 lb exercise ball (m 2 ) Compute range with different counterweights…

19 Example Simple Calculation assume:h = 4 feet m 1 = 50 lbs given:m 2 = 3 lbs R < 67 feet

20 Design Flexibility What aspects of the trebuchet can be varied (after primary construction) to change throw distance?

21 Design Flexibility Counterweight mass (m 1 ) h: –fulcrum height –starting position –beam length – how? sling length release angle

22 Counterweight Design Constraint: must fit in 5-gallon bucket. What materials might be appropriate?

23 Counterweight 5 gallons = 0.67 ft 3 water: 62.4 lb/ft 3 sand (dry): ~110 lb/ft 3 sand (saturated): ~135 lb/ft 3 concrete (ordinary): ~120-150 lb/ft 3 steel: ~490 lb/ft 3 lead: ~710 lb/ft 3

24 Other Considerations Will it tip over? Will the beam break? Will the sling snap? Will the throw be straight?

25 References http://www.ripcord.ws/ http://www.algobeautytreb.com/


Download ppt "Trebuchet Basics Fritz R. Fiedler. Basic Sling Trebuchet."

Similar presentations


Ads by Google