# Method of Measuring Height

We will be utilizing a protractor with tape measure method. Because my tape measure does not have metric units, we’ll also be using the conversion 1 foot: 0.3048 meters

- Stand a certain distance away, carrying the tape measuring from the base.
- Record the distance from the person with the protractor and the base of the rocket.
- Tip: Ensure the distance is sufficient because too close or too far means inaccurate results
- Record the maximum height’s angle and then use good ol’ geometry.
- In this situation we have the horizontal distance and the angle. tan (theta)= y/x
- Therefore we can find the Y value(height) by using the equation x*tan(theta) = y
- Be SURE TO USE DEGREES AND NOT RADIANS
- Convert using 1 ft: 0.3048m
- Record and test again if necessary. Then average.

Form of Measuring Height:

Inclinometer: My iPhone 5 has a compass application that has a setting to where it can measure the angles at which it the phone is being held at. So basically I will use my phone as a protractor. Which from simple trigonometry can be used to figure out the height at which the bottle rocket traveled.

- We will be using two different methods to measure height of our rocket and our competitors.

i. Inclinometer- fist we have downloaded an android app on a phone. that will be used as our inclinometer and we are also using another app for a scientific calculator for our calculations. The angle needs to be measured along with the distance that you standing from the launch pad. From there you use trig to find your height.

ii. Video/photographic- Steven will also be using a go pro camera to verify our results from the inclinometer.

Group 2

For measuring height we will be using a pictures and/or video. Using the throwing area protection fence as a reference point. Which was today (practice day) measured to be around 25′ tall. Todays practice rocket shots gave the camera lens an estimated max visibility of about 45′ high with the camera 109′ away and 8′ above the launch area we used for practice.

For actual competition day measuring, the camera will be set up at a pre -decided distance. A clear ruler will be place in the cameras view and adjusted so that an increment mark on the ruler will be aligned with top of the 25′ protection fence. Increments below and above that mark can then be given a value for measure. After all shots are completed, review of the video and /or still shots can looked at to get the rocket measurements at its maximum height.

Launch-Day- Record from group @ 2 I planned on comparing my measurement to other team measurements but only numbers for 2 groups where close 2 others measure ments. I also only had 5 out 7 groups on video. I cant use rocket height to determine what group was which, and i cant identify everyone by the jacket they where wearing. that was bad planning on my part not to record which team was which video.

Our team’s rocket height will be measured using a home made sextant. The sextant is made using a protractor, some string, a battery, and some duct tape.

To find the height we will have one teammate stand a certain distance away from the launch pad, this distance will be our baseline. We will then use the sextant to aim toward the height of the rocket after it launches and will then find the angular distance from the angle measured. Angular distance is found by taking the starting degree, usually 90, and subtracting the found angle, say; 30 degrees. So then it would be 90 – 30 = 60 degrees. Once we’re found the Angular distance we will then find the tangent of 60 degrees which is found by dividing the Opposite side of a triangle by the Adjacent side. So the tangent of 60 degrees is 1.73. Multiply our baseline, which we’re say is 60 feet, and 1.73 to find the height of the rocket which is 103.8 feet. So our “pretend” rocket went 103.4 feet in the air.

To measure the height of the other teams rockets, we will stand back from the launch site 100 feet. One of us will manage a protractor and measure the angle of the rocket at peak height (x). We will then take 100 X cos(x) to find the height of the rocket.