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Apogee Rocketry Workshop #337:

How to Determine Ejection Charge Size?

Advanced Construction Video

When you are setting up dual deployment charges for high power rockets, the most common question is, how much black-powder do you need to ensure a successful deployment? How do you go about calculating the size of the charge?

In this video, we'll cover these questions, as well as things like the different types of grain size for black powder, and where you will purchase it. We'll also talk about ground testing your deployment charges, and what constitutes a successful ground test.

View this week's Rocketry Workshop Videos (Duration 17 min, 19 sec)

Previous videos are found on our archive page.

 

 

Build the Mini Nike Smoke

Launch Visualizer Beta Testers Wanted

Newest Products From Apogee Components

Check out the latest products to hit Apogee's shelves!

Attractive Rocket Posters

X-15 Rocket posters

You've seen these new posters as the background of our how-to-videos, and larger versions hanging on our walls when you've visited our shop in Colorado Springs. Now you can own a piece of history and capture the excitement of model rocketry. Each high quality poster is printed at 18 inches wide by 27 inches tall and is perfect for framing. Hang them in your build room, or have them adorn your office. They are great conversation starters to get other people interested in rocketry. Choose from these new posters: The X-15, Flying Machine, or the Zephyr.

Zephyr Jr Rocket Kit

Zephyr Jr rocket kit

The Zephyr Jr rocket is a 1/2 scale rendition of the famous Apogee rocket that so many people use to get their L1 Certification. This is an "everyday" rocket that can be used whenever you feel the need for speed. It is based around the BT-70 size tube, and uses simple construction techniques like surface mount basswood fins. It comes with a beautiful 5-to-1 plastic ogive nose like its bigger brother. You'll find that this lightweight rocket flies great on 24mm diameter rocket motors.

Klima ME-163 Rocket Plane

Me-163 Rocket Plane

The legendary Me-163 rocket plane comes to life as a real model rocket that you can control. From Klima and imported from Germany, this rocket is fast, it's maneuverable, and it is a lot of fun.

This is a radio-controlled rocket that you control going up and as it glides down to the ground. It is Skill Level 5 for the challenges it has in construction and in flying. RC radios, servos, and transmitters are NOT included. We recommend it only for the experienced RC-rocket pilot that is looking for something fast and challenging.

 

RockSim Live Training - Every Friday

 

Customer Comments

“Although I am a long term flying model builder, I have not touched a model rocket in over 50 years. My granddaughter quietly took up flying model rockets and was having good success. BUT just recently she decided to become involved with high power rockets. This generated a number of telephone calls to grandad; "Could I help?" I recognized I was horribly out of date! This was resolved first by time spent on the internet and then follow on conversations with the folks at APOGEE. Questions became answers or solutions. Products were honestly discussed. Yes, I spent money, but ended up with one item that worked perfectly, not several attempts at getting the correct thing. And, YES, my granddaughter now has her Level 1 certificate.

-- Doug Barry

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