Table of Contents

## Can coefficient of drag be greater than 1?

Two objects having the same reference area moving at the same speed through a fluid will experience a drag force proportional to their respective drag coefficients. Coefficients for unstreamlined objects can be 1 or more, for streamlined objects much less.

## Does drag coefficient change with size?

The drag coefficient will change with size because the Reynolds number will change and the ratio of viscous and inertial forces will be different. One can sometimes alter the fluid conditions so that a scale model will have a Reynolds number near that of the actual body and the drag coefficient will be more meaningful.

**Does drag coefficient stay constant?**

For most aerodynamic objects, the drag coefficient has a nearly constant value across a large range of Reynolds numbers. In all of the cases presented on this figure, the density, viscosity, and diameter of the ball are the same. The flow velocity is gradually increased from the left to increase the Reynolds number.

### How does wing size affect drag?

“Yes, wingspan will affect flight, however there will be a point where the size of the wingspan will create too much weight and drag to be effective. For a glider, which a paper airplane is the more lift the glider has the longer it can fly. However, you must keep the weight and drag in check to avoid flight failure.”

### How do you reduce drag coefficient?

You can reduce your vehicle’s aerodynamics by: Lifting it ” “an inch of increased ride height degrades the coefficient of drag by about 10 drag counts [. 01],” says Wegryn. Adding wider tires.

**What is considered a good drag coefficient?**

Typical drag coefficients The average modern automobile achieves a drag coefficient of between 0.25 and 0.3. SUVs, with their typically boxy shapes, typically achieve a Cd=0.35“0.45. The drag coefficient of a vehicle is affected by the shape of body of the vehicle.

## How much drag does a rocket experience?

is the drag coefficient. The drag coefficient is a parameter describing how aerodynamic the rocket is. It varies with the Mach number. Typical values are in the range 0.3“1.3, with a maximum around Mach 1 (sound barrier).

## What is the best fin shape?

Elliptical Fin

**How long should fins be on a bottle rocket?**

Stop! All fins must be at least 10 cm from the throat exit plane of the bottle see diagram 1.

### What makes a rocket fly high?

An object’s acceleration increases as the force on the object increases. So to help your rocket go faster and higher: 1) The faster the fluid can be expelled from the rocket, the greater the thrust (force) of the rocket. 2) Increasing the pressure inside the bottle rocket produces greater thrust.

### What helps a rocket fly?

The aerodynamic shape of the nose cone helps prevent air from slowing the rocket. The fins help guide the rocket to fly straight. Finally, the propellant system includes a mixture of fuel and a chemical called an “oxidizer” that gives off oxygen. The fuel and oxidizer burn together to launch the rocket off the ground.

**How high will a bottle rocket go?**

Reaching 30 or 40 metres should be quite achievable, but distances beyond 100 m are possible with some careful design. The main problem with launching the rocket at an angle is that the rocket can no longer stand on its own feet, and if it is supported entirely by its nozzle, then it tends to flop over.

## What is the best fin shape for a bottle rocket?

The fins should be thin and tapered.

- Swept back fins create less drag than straight fins and rounded corners on a fin create less drag than sharp corners.
- Every surface on the rocket should be as smooth as possible.

## What is the best size for a bottle rocket?

2-liter

**What are 3 of the most common rocket fin shapes?**

The most common fin planform shapes for experimental high-powered and experimental sounding rockets are clipped delta, trapezoidal, and elliptical. The optimal planform shape depends on the speeds that the rocket is designed to fly at.

### What four factors influence the optimal fin shape for a model rocket?

It is a combination of friction drag and pressure drag. The profile drag force is determined by a number of factors, including the surface finish on the fin, airfoil used, area of the fin, the length of the fin chord, and the speed at which the rocket travels.

### Does the length of a rocket affect its flight?

Assuming only the length changes and weight, width, shape, fuel quantity, etc. stays the same, the distance a rocket can travel will change. Increasing the length increases the surface area. Shorten it and it will have less surface area.