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Model Rocket Engines

A Series Model Rocket Engines  ( Click Here To See all 13 A Series Model Rocket Engines )
A Series Estes model rocket engines are some of the most common rocket motors available and fit a number of model rockets. Designed for beginner and intermediate level rockets, some of these rocket engines can soar to heights of over 1,000 feet. View the assortment of A-Series model rocket engines to find which model rockets correspond with the matching rocket engine. Finding both a model rocket and a matching A series rocket motor is made easy with 321Rockets.

Estes is known for leading the industry in reliable and cost effective rocket motors that deliver maximum results. Engineers have been building these rocket motors since the late 1950's, and it is safe to say, they have figured it out. No other rocket engine company has the background and technology to compete with the ingenuity of Estes model rockets.

B Series Model Rocket Engines  ( Click Here To See all 7 B Series Model Rocket Engines )
Found a model rocket that requires B Series rocket motors? Browse an assortment of B Series rocket engines that fit a number of different Estes model rockets. B Series rocket engines fit all types of Skill Level model rockets from Easy to Assemble to Skill Level 3. There a many options, so take the time to look through the large selection.

Estes rocket engines are designed to be affordable and reliable. Don't skimp when it comes to choosing model rocket engines, go with the best, go with Estes. Are you planning on launching many model rockets that need to be fitted with a B Series engine? Then you can always buy model rocket engines in bulk. Save on price and get a large supply. The worst feeling is running out of rocket engines. 


C Series Model Rocket Engines  ( Click Here To See all 9 C Series Model Rocket Engines )
You have picked out a model rocket that requires C Series engines? Now it's time to find which C Series rocket motor will fit your model rocket best. Every model rocket engine is different, some have longer delay charges which makes them float longer after the propellant runs out, while others may only be a single stage engine. Look through 321Rocket's selection and find the one for your model rocket needs.

Model Rockets like the Metalizer, Patriot, and Big Daddy are a few examples of model rockets that fly on C Series rocket engines. Once equipped with these rocket motors some rockets can fly nearly 1,000 feet into the clouds. Find out how much fun it can be experimenting with different sizes and types of Estes rocket motors.

D Series Model Rocket Engines  ( Click Here To See all 5 D Series Model Rocket Engines )
Looking for a model rocket engine that is built for some serious altitude? A D Series model rocket engine is what you need get some extreme height. Often beginner model rockets are not fitted with D Series rocket motors, however, after a few launches on smaller rocket motors we suggest giving the D Series a try. You'll love the results you see and you'll want to continue to go bigger and higher.

The D Series rocket motors can be fitted on a number of model rockets, many of which are further up the Skill Level tier. There are a few model rockets that are Easy to Assemble, like the Blue Ninja, that fly on D Series rocket motors. As you browse through the d Series rocket engines you will find many more model rockets that can be equipped with D Series rocket engines.

E Series Model Rocket Engines  ( Click Here To See all 7 E Series Model Rocket Engines )
So you are looking for some serious rocket engine power? Well an E Series rocket motor is just what you will want to look into. These are the biggest and baddest rocket motors available through Estes and they pack a wallop. Estes E Series engines have twice as much power as the D Series engines and are deisnged to fit on some of the biggest model rockets available from 321Rockets.

Safety is always important when it comes to launching model rockets, with that in mind it is important to have adult supervision for children under the age of 18 when launching with these rocket motors. Once you see a model rocket blast off from an E Series rocket engine you will quickly see the power these engines have inside.

Note** Launching E Series model rocket engines requires E Launch Controller and Porta-Pad E Launch Pad.

Estes E9-4 Rocket Engines


Price:  $ 49.99


Estes E9-6 Rocket Engines


Price:  $ 49.99


Estes E9-8 Rocket Engines


Price:  $ 49.99


Bulk Model Rocket Engines  ( Click Here To See all 19 Bulk Model Rocket Engines )
Do you have a youth group, classroom or just a big model rocket enthusiast who needs a large quantity of model rocket engines? Save money and buy in bulk! 321Rockets offers a number of its A, B, and C Series rocket motors in bulk packs. No matter if you are teaching science in grade school or entertaining a church group, bulk model rocket engines are the way to go.

Often model rockets can launch on a variety of model rocket engines. With the Estes Blast Off Flight Pack you can launch model rockets on an assortment of A, B, or C Series rocket engines. With 24 rocket engines included in this bulk pack, experiments can be done to show how model rockets react to different rocket engines.

Rocket Engine FAQ  ( Click Here To See all 0 Rocket Engine FAQ )

Rocket Engine FAQ

What does the first letter mean?

The code on the model rocket engine typically starts with a letter such as A, B, C etc. For some engines a fraction may precede the letter such as 1/4 or 1/2. This letter indicates the engines total impulse range (commonly measured in newton-seconds). Each letter in successive alphabetical order doubles the impulse of the letter preceding it. This does not mean, however that a given C engine has twice t he total impulse of a given B engine, only that C engines are in the 5.01-10.0 N-s range while B engines are in the 2.51-5.0 N-S range. For instance, a B6-4 engine from Estes-Cox Corporation has a total impulse rating of 5.0 N-s. A C6-3 engine from Quest Aerospace has a total impulse of 8.5 N-s.

What does the first number after the letter mean?

The number that follows the letter indicates the average thrust of the engine measured in newtons. A lower number represents a lower average thrust and usually a longer thrust burn (assuming comparable engines have the same total impulse). So a B4 engine with go slower and burn longer than a B6 engine (assuming that they have the same total impulse).

Clustering engines increases both the average and total impulse and thus the velocity of the rocket. For example if you put two B6-4 engines together in a cluster the average thrust would rise to 12 newtons and the total impulse would be classified as a C engine. Staging engines increases the total impulse but does not change the average thrust. For example, if you have a two stage rocket with a B6-0 for the first stage and a B6-6 for the upper stage the average thrust stays at 6. The two engines together would be equivalent of C6 engine.

What does the last number mean?

The delay component from the picture (4) controls when the ejection charge is ignited and the recovery device is ejected. This is the last number in the model rocket engine classification and simply represents a time in seconds. Thus a B6-4 engine will have a delay after the initial thrust of 4 seconds before the ejection charge is fired. A B6-6 will have 6 seconds of delay.

Picking the right delay is pivotal in having a successful flight. Too short a delay and the rocket is still traveling at a high rate of speed when the recovery device is ejected. This may cause damage to the recovery device and/or rocket. A delay that is too long may result in a late recovery device ejection. This can be disastrous for obvious reasons. Usually a longer delay time will be used on a lighter rocket or the top stage of a staged rocket. A shorter delay is good for heavier rockets.