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Pratt Hobbies Ejection Canisters
Three Sizes Available for High Power Rockets That Use Dual-Deployment Parachute Systems

Small Capacity Ejection Canister
Specifications:

Common Name: WEC-5B
Weight (empty):
3.0 g (.10 oz)
Black-Powder Capacity: 1.5 grams (max)
Contents: 5 canisters with 10" long wire leads.

Pratt Hobbies Small Ejection Canister
P/N: 03070
Price: $12.00

Back-Ordered (9/8/10)

Limited Quantities Available

Small Capacity Ejection Canister

The WEC-5B Ejection Canisters feature a snap-top ejection charge container. Black-Powder is not included.

Large Capacity Ejection Canister
Specifications:

Common Name: LWEC-5B
Weight (empty):
3.2 g (.11 oz)
Black-Powder Capacity: 2.1 grams (max)
Contents: 5 canisters with 10" long wire leads.

Pratt Hobbies Large Ejection Canister
P/N: 03071
Price: $12.50

Out of Stock
Medium Capcity Ejection Canister

The LWEC-5B Ejection Canisters feature a snap-top ejection charge container. Black-Powder is not included.

Variable-Capacity Ejection Canister
Specifications:

Common Name: VCEC-1
Weight (empty):
5.5 g (.19 oz)
Black-Powder Capacity: 6.8 grams (max)
Contents: 1 canister with 10" long wire leads.

Pratt Hobbies Var-Capacity Ejection Canister
P/N: 03072
Price: $2.75

Back-Ordered (9/8/10)
Variable Capacity Ejection Canister

Variable Capacity Ejection Canisters are for rockets with more volume to pressurize than can be done by the WEC canisters. Black-Powder is not included.

Questions Regarding Back-Ordered Items?

I apologize for the inconvenience of any item that is on back-order status. We are working extra hard to make sure all items are in stock, because I know the disruption and hardship it causes great customers like you. Please accept my apology.

If you have a question about any item that is on back-order status, or if you desire an email notification to inform you when the item is available, please send us an email. We will be happy to help you out, or suggest alternatives.

Pratt Hobbies Ejection Canisters

All the Pratt Hobbies Ejection Canisters use a filament-based ignition system. Basically, it is a very tiny wire that heats up quickly like an igniter. But instead of igniting the pyrogen on a typical igniter, it ignites the black-powder that you place into the canister. This is just as reliable as an electric match or squib, and there is no requirement for special licensing, storage or HAZMAT shipping. These ejection canister-igniters have been tested with all common electronic altimeters.

Ejection Canisters are supplied with 10 inch long wire leads, which are stripped and tinned. Each Ejection Canister is tested for resistance while it is being assembled, and the measured resistance is written on the canister. You can and should use a multimeter to measure the resistance of the Canister before use; if it varies more than 10 ohms, it can be returned to the manufacturer for a free replacement.

We recommend FFFG-size black powder, the same that is used in Aerotech reload kits. Smokeless powder (Pyrodex) works well if the canister is wrapped with PVC tape after loading to improve containment. Always test on the ground to make sure your ejection system works.

The larger Variable Capacity Ejection Canisters are for rockets with more volume to pressurize than can be done by the two smaller canisters. The sliding plug allows you to use an appropriate volume of black powder, and keeps it in contact with the igniter element.

Dual Deployment: Part Three

Setting Up Dual Deployment Rockets - Part 3 of 5

This video, which describes how to set up dual deployment rockets, will show you how to use these ejection canisters that are available here on this web page.

Frequently Asked Questions About the Pratt Hobbies Ejection Canisters

Q. Where do I buy the black powder to fill up the canisters?

A. Black powder is classified as an explosive, and can only be purchased by people older than 21 years old. You will find it locally at a gun supply store that specializes in muzzle-loading firearms. Apogee Components does not maintain a list of stores (sorry...).

Q. How much Black Powder should I use for the ejection charge?

A. The amount is determined by how much volume inside the rocket needs to be pressurized to provide the kick to blow the nose off and the parachute out of the rocket. There is a nifty little ejection charge size calculator at: http://www.rockethead.net/black_powder_calculator.htm

We recommend that you determine how much BP you'll need first, and then choose the appropriate ejection charge canister.

Q. What kind of igniter is in the ejection canister?

A. It isn't really an igniter. It is a small heating element that is enough to ignite the black powder inside the canister. Since there is no pyrogen on the heating element, this is a totally safe device and can be shipped without any hazmat fee. It can even be shipped via Express Mail service.

Other items that people who bought these Ejection Canisters also purchased:

Modern High Power Rocketry - 2nd Edition
Product No. 01026

The most extensive book ever written about "how to build LARGE high power rockets." Highly recommended for all modelers getting ready to take a jump to those bigger and more powerful rocket engines. It takes you step-by-step in the process of how to prepare for Level 1, Level 2, or Level 3 high power certification. This book does cover the construction and use of payload bays, such as those listed on this page.

Modern High Power Rocketry
G-Wiz Flight Computers - The ultimate in flight control for large and expensive rocketry projects. These onboard flight computers contol when the flight events (like staging, parachute ejection) occur during the trajectory. Uses both barometric and accelerometer sensors to get the most accurate determination of the rockets altitude and orientation, so it provides extra reliability to control the flight. Available with or without data recording capabilities.
G-Wiz Flight Computers
Entacore's AIM USB Altimeter - This is a programable dual-event altimeter with data recording capabilities. That means that after the flight, it not only beeps out the peak altitude, but you can download the data into your computer so you can get a plot of altiude versus time. Great for determining the parameters of your rocket's flight.
Entacore AIM-USB altimeter
High-Power Capable Parachutes

SkyAngle parachutes were designed and constructed specifically to handle the extra stress of high power rockets. Because of the extra weight of the bigger rockets, they have more than their share of parachute malfunctions. The SkyAngle parachutes are more durable, and bring your big rockets down slower.

High Power Rated Parachutes
SkyAngle Parachute Deployment Bags

A deployment bag is a device to help ensure that parachute inflates properly and in the correct order. It forces the lines to completely stretch out first, and then the canopy is released so that it can properly inflate. It also minimizes the loads on the suspension lines to prevent tears, and it gives additional protection from the heat of the ejection charges. If you're doing high power rockets, you really need this extra insurance to make your project a success.

Sky Angle Parachute Deployment Bags

Nomex Wadding - This is a permanent form of recovery wadding. It protects the parachute from the heat of the ejection charge, preventing it from getting scorched. Comes in high-visibility orange color which also aids in finding the rocket if it lands in tall grass. This rocket would require the 18" square size (Part Number 29311).

Quest Q2 Igniters

Epoxy Clay - While it has a 1,001 uses around the house, it works great on rockets to make super-strong fillets where the fins attach to the rocket. Better than regular epoxy because it stays in place and doesn't ooze all over the rocket. So you can get perfect fillets on all your fins, without having to do them one at a time. On the payload bay, it works greats to attach the plywood bed to the brass rails without making an epoxy mess (it is highly suggested for these electronics bay kit).

Fix-It Epoxy Thumb

Actual Customer Comment:

"OK.... Let me just say WOW! I e-mailed yesterday to request an expidite on the order I placed on Friday. When I got home my order was already here... just who do you know at UPS??? :-) Once again, you have proven your commitment to customer service. I can't believe I actually considered ordering from a discount warehouse... the extra cost was well worth the incredible service. Hat's off to all of you there at Apogee! Thanks again!" -- Frank Smith

Customer Service Standing By

We're Here To Help You

Our Tel: 719-535-9335
(Talk to a real person)

Hours of Operation:
8:30am - 5.00pm

After Hours:
please e-mail

Apogee Components, Inc.
3355 Fillmore Ridge Hts.
Colorado Springs, CO 80907 USA
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This page last updated on: 09/08/10