NASA CDR Presentation Spring Grove Area High School

•The fins will be made from 1/8 th inch thick G-10 Fiberglass that will allow the rocket to have low drag and also allow the rocket to have a stable stability margin... Payload cont. Tw

NASA CDR Presentation

Spring Grove Area High School

2015 Full-Scale Rocket

Length: 114.50 inches

Weight: 23.35 pounds

Diameter: 4.0 inches

Body Tube : Fiberglass Wrapped Phenolic Tubing

Center of Pressure: 81.97 inches

Center of Gravity: 71.09 inches

Static Stability Margin: 2.72

Drag: 1.2 based on nose-cone shape, body material, and fin shape

Rocket Continued……

•We will use a 75 mm Motor Retainer that is epoxied onto the ¾” lip of the motor tube that is exposed from the back centering ring.

•The fins will be made from 1/8 th inch thick G-10 Fiberglass that will allow the rocket to have low drag and also allow the rocket to have a stable stability margin.

 Will determine the effect of size of single port holes on the measurements taken

by Stratologger CF altimeters

help us potentially find a way to

calculate the ideal port hole size

Payload (cont.)

 Three of the bulkheads will have walls to accommodate altimeters

 Three altimeters per section

 One 9V battery in each section

will power the three altimeters

 9V battery will be secured to

the bulkheads

on the launch pad

for a long period of time

Payload (cont.)

 Two lines of ¼” all thread will run

through the entire payload

 A U-bolt will be attached to each end to connect the payload to the other

components of the rocket

 Entire payload will be approximately 15”

in length

Fin Brackets

 The fin brackets will provide a way to easily secure fins to the body of the

rocket

 The fins or the bracket can be replaced

if any damage were to occur

Fin Brackets (cont.)

 The fin bracket is two pieces, which will

be bolted together

 The fins are bolted within the fin slots, and the entire piece is then attached to the body tube

Fin Brackets (cont.)

 A single piece of the fin bracket can print overnight: one complete bracket can be made in two days

 Full scale bracket is two separate parts, due to the size restraints of the 3D

printer

Electronics Bay

 Dual Deployment

 Two Altimeters with a

separate battery for each.

 They will be wired in series to

9 Volt batteries

Final Motor Selection

 Our final motor selection for the full-scale rocket will be the K-510 Classic motor made by Cesaroni Technologies

Incorporated

 Impulse of 2,486 Newton*Seconds

 75 mm, two grain motor

 13.78 inches long

Static Stability Margin Diagram

 Center of Gravity- 71.09 in from nose cone

 Static Stability Margin- 2.72

Recovery Systems

• The chutes we are using are a Fruity Chutes Standard 24 inch drogue chute and a Iris Ultra 72 inch main parachute.

• The 24 inch drogue chute will come out at apogee A charge

in the electronics bay will push out the payload and the chute from the back half of the rocket.

• There will be a second charge that goes off two seconds

after the first charge to ensure everything was deployed

properly This charge will come from the redundant

altimeter.

Recovery Systems

• The second chute is our 72 inch main parachute, being a Fruity Chutes Iris Ultra with a Coefficent

of Drag of 2.2, enough to slow the rocket to a

velocity of 17.1 feet per second on impact

• This chute will be deployed at 700 feet by

another charge in the electronics bay This charge will separate the electronics bay and the 72 inch parachute from the front half of the rocket

• This charge will also have a backup delayed at

600 feet to ensure proper deployment

Recovery Systems

 Parachute Size- 24” Drogue

 Harness Length- 15 ft

 Harness Material- Tubular Nylon

 Harness Size- 1 inch

Drift Calculations

 With the 24 inch drogue and 72 inch main parachute….

Testing Results

very strong and durable, taking no damage and holding up on both flight and landing

according to plan The rocket with 3.5

grams of black powder easily ejected the front half of the rocket from the electronics bay.

 The rocket with its’ dual deployment payload

deployed the payload and drogue chute at apogee correctly and the main at 600 feet

 The payload had one altimeter in it to make sure that data could be recorded That altimeter read 2,071 feet and functioned correctly allowing us

with confidence building the full-scale rocket.

Subscale cont….

Failure Modes

 Rocket being too massive for proposed motor

 To mitigate this we will check the

masses of the material compared to the mass on RockSim

 Construction will be carefully monitored

so that every part of the rocket will be strong

Failure Modes

 Looking at the design of our payload

conceivable failures are the payload

exerting to great of a force on the shock cord and it snapping

 To mitigate this failure we will use shock cord tested to hold 2000 pounds of force and a U-Bolt bolted into the top

bulkhead of payload

Personnel hazards

came up during subscale building

include:

 Sawdust going on floor and having the tile

be very slick to walk on.

 Using superglue and having sharp pieces of

it go into your hand.

as we work and be more careful when

using any type of adhesive

Interfaces and Integration

Educational Engagement

 After presentation participation slip

 7 th and 8 th graders build rockets with

supervision

 Other Activities

 6 th grade and under

○ Able to watch

○ Rocket poem and dance

○ Rocket building snack activity

 We will explain the NASA Student Launch

rocketry program, as well as our Team America Rocketry Challenge Program.

○ Middle School TARC team

 PowerPoint:

○ Mission

○ Instructions on building a basic rocket

WGAL Preview

https://www.youtube.com/watch?v=UH-csiUWZ5U