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I want to use the same fins as last time, but put them more to the bottom, add one more fin to the three fins, and make them a little bigger.

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A huge mistake that we made is that we used 7 fins; way to many. That weighted the rocket down. This time, we should use the top fins

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We should use four fins and make them tall and wide

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The fins should have something with no holes, so either foam or cardboard. The both have holes, but cardboard has less holes. We decided to use cardboard fins and cover the holes with sealing tape. We also want the fins to be facing down just like Sammy said.

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The fins should have less air drag. The fins shouldn't point sideways, but be slanted sort of downward. We have already decided that they will be made of cardboard.

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i think these are good fins because they are not to big if they were big the air would not go through but this is good because it is not big so the air can go through and it looks like it will have good control in the air

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I think that two major errors we made were having fins that fell off of the rockets and having fins with a different volume. I think we should have very air tight rockets to.goodBad

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I definitely think the fins should be aerodynamic having a slanted top the and a vertical drop down forcing all the air pressure their forcing a air barrier which will keep the rocket in line. I also think the fin should be aerodynamic and have the least drag as Sammys picture shows.

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1. Circumference: 26cm
2. Diameter: 8cm
3. Hollow (So it's lighter)
4. The wall of the nose cone (thickness): 5ml

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We also think that a parabolic nose cone would work too. (Look at the nose cone labeled parabola).

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Long Elliptical seems like the best nose cone. (The picture is glitching so just click it).

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The bottom of the seltzer can (Where the nose cone goes) is 26 cm.

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I did some research and the best cone I could find was a long elliptical with a drag force of 4.149 although it has a 0.01 speed disadvantage versus the second best rocket the parabolic which goes 39.28 mph while the parabolic only goes 39.27 mph. The reason why the long elliptical is the best is it's drag beats the parabolic drag force by 0.328 with drag force of a parabolic rocket being 4.447.

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we should have a round sharp nose cone that dosent have to much wait and not enough wait so we should have it with medium wait

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For the fuel tank, we can cut the bottom out of our bottle and put fuel in their. I think we should fill the bottle very full, but make a sorta small cutout. If we do that, the rocket will go stright.

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To connect the bottle to the fins, we can cut slits in the bottle and add slits to the fins. Then we could connect them. The fins will reduce drag if they are tilted downwards.

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I did some research and the best cone I could find was a long elliptical with a drag force of 4.149 although it has a 0.01 speed disadvantage versus the second best rocket the parabolic which goes 39.28 mph while the parabolic only goes 39.27 mph. The reason why the long elliptical is the best is it's drag beats the parabolic drag force by 0.328 with drag force of a parabolic rocket being 4.447.

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I see that we all have the same idea for the nose cone, but what about how to connect it to the seltzer bottle? We should have a heavier because it is better to have a stronger base. Because of that we should put the nose cone on the cap.

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We want to make our nose cone be able to cut through gravity, but also make it reduce drag. We need to choose one that reduces the most drag.

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This chart shows the different drag of different types of nose cones:

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I think we should use a narrow and compact nose cone because a narrow tip will work well with aerodynamics and the more compact the nose cone the smaller the area for wind drag.

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I think we should add a sharp nose cone so it deos not block the air like if its  flat  then it would block all the air

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For the project we will be using a 1 liter, plastic vintage bottle.

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We should add a narrow nose cone with a very sharp tip. With a sharp tip on the top, it will go higher and faster.
For example;

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I think we should use a narrow nose cone with a sharp tip. The tip will slice through the air and create less drag.

Ex.