· 2
Liter Bottles- ($4)
· Paper
Nosecone ($.03)
· Duct
Tape ($3.50)
· Card stock folders($1 apiece)
· Foam
Packaging (Acquired)
· Bubble
Wrap (Acquired)
· Trash
Bag ($.5)
· Yarn
($1)
Procedure:
First, we assembled out materials, and planned what we were going to do.
We decide to to cut one of the bottles down, and cut a nose cone for it, making the cockpit for our eggonaut.
Unsure about how our parachute would deploy, we decide to make an emergency capsule made of foam and bubble wrap to ensure eggonaut survival.
Next, we cut the card stock folder into wings, and attach them to the untouched bottle.
Then, we use duct tape to attach the bottles, and reinforce the wings.
For our parachute mechanism, we used a large trash bag, and punched holes through it, then laced yarn through it.
We would then insert the emergency foam capsule into the cockpit of the rocket, followed by the parachute, then put on the fuel cell, and the nosecone put atop it all.
Results:
Our rocket only traveled a bit more than 35 feet and stayed in the air for 2.7 seconds. On the test run, the parachute deployed, but it never deployed for the real launch. This could have been due to a parachute packing malfunction, the nosecone being worn out after the test, or we were just lucky the first time it deployed. Fortunately, the egg easily survived the fall, possibly because it was only a 35ft drop, but also due to the foam capsule and bubble wrap. Unfortunately, this capsule could easily have been a double edged sword, and its weight could have negatively effected the height. The nosecone was also imperfect, and could have been tighter fit and sharper, which would have caused more balance, and less drag.
Conclusion:
I believe having the backup eggonaut survival capsule was the right way to go. What would have been best would have been a reliable parachute deploying mechanism, but we couldn't figure that out. Having a straighter nosecone, and possibly a longer rocket could have helped a lot with the height deficiency.
Calculation:
We need to solve for height, so I'll use the formula: Δy= Vit +1/2agt^2
Δy=0+1/2(9.8)(2.7)^2
Δy= 35.7 ft
This calculation may be more accurate than Mr, Yav's estimate against the side of Sobroto, although it may be a little low, as this takes the initial velocity as 0. If it's greater on launch, then it could be the 50ft Mr. Yav initially estimated.
To Solve for Initial Velocity, we can use the handy hatchet equation, using our new height, and by saying that the Vf at the apogee is 0, and Gravity=-9.8m/s^2
0=Vi^2+(2)(-9.8m/s^2)(35.7)
0=Vi^2-699.72
699.72=Vi^2
Vi=26.45
FBDs:
Procedure:
First, we assembled out materials, and planned what we were going to do.
We decide to to cut one of the bottles down, and cut a nose cone for it, making the cockpit for our eggonaut.
Unsure about how our parachute would deploy, we decide to make an emergency capsule made of foam and bubble wrap to ensure eggonaut survival.
Next, we cut the card stock folder into wings, and attach them to the untouched bottle.
Then, we use duct tape to attach the bottles, and reinforce the wings.
For our parachute mechanism, we used a large trash bag, and punched holes through it, then laced yarn through it.We would then insert the emergency foam capsule into the cockpit of the rocket, followed by the parachute, then put on the fuel cell, and the nosecone put atop it all.
Results:
Our rocket only traveled a bit more than 35 feet and stayed in the air for 2.7 seconds. On the test run, the parachute deployed, but it never deployed for the real launch. This could have been due to a parachute packing malfunction, the nosecone being worn out after the test, or we were just lucky the first time it deployed. Fortunately, the egg easily survived the fall, possibly because it was only a 35ft drop, but also due to the foam capsule and bubble wrap. Unfortunately, this capsule could easily have been a double edged sword, and its weight could have negatively effected the height. The nosecone was also imperfect, and could have been tighter fit and sharper, which would have caused more balance, and less drag.
Conclusion:
I believe having the backup eggonaut survival capsule was the right way to go. What would have been best would have been a reliable parachute deploying mechanism, but we couldn't figure that out. Having a straighter nosecone, and possibly a longer rocket could have helped a lot with the height deficiency.
Calculation:
We need to solve for height, so I'll use the formula: Δy= Vit +1/2agt^2
Δy=0+1/2(9.8)(2.7)^2
Δy= 35.7 ft
This calculation may be more accurate than Mr, Yav's estimate against the side of Sobroto, although it may be a little low, as this takes the initial velocity as 0. If it's greater on launch, then it could be the 50ft Mr. Yav initially estimated.
To Solve for Initial Velocity, we can use the handy hatchet equation, using our new height, and by saying that the Vf at the apogee is 0, and Gravity=-9.8m/s^2
0=Vi^2+(2)(-9.8m/s^2)(35.7)
0=Vi^2-699.72
699.72=Vi^2
Vi=26.45
FBDs:
