Estes Model Rocket Engines

rocket engines
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    December 1969
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ESTES® MODEL ROCKET ENGINES The famous model rocket engines that made model rocketry the great activity it is today.. Estes® model rocket engines have been proven consistent and reliable in more than 300,000,000 launches. • The concept of a factory assembled model rocket engine is the foundation of this scientific and educational activity! • 3% of all Estes® engines are static-tested at the factory for reliability and adherence to performance specifications. • All engines comply with the codes of the National Fire Protection Association and are certified by the National Association of Rocketry. 1. When engine is ignited, it produces thrust and boosts rocket into sky. 2. After propellant is used up, delay is activated, producing tracking smoke and allowing rocket to coast. 3. After delay, ejection charge is activated, deploying recovery system. WHAT SIZES ARE AVAILABLE? Estes® engines are available in a wide variety of sizes and power levels: TYPE TOTAL IMPULSE ENGINE TYPES 1/4A 0.313 - 0.625 Mini 1/2A 0.626 - 1.25 Standard, Mini A 1.26 - 2.50 Standard, Mini B 2.51 - 5.00 Standard C6 5.01 - 10.00 Standard C11 5.01 - 10.00 "D" Size D 10.01 - 20.00 "D" Size E 20.01 - 30.00 "E" Size MINI ENGINE 0.5 in. (13 mm) diameter STANDARD ENGINE 0.69 in. (18 mm) diameter "C11" & "D" ENGINE 0.95 in. (24 mm) diameter "E" ENGINE 0.95 in. (24 mm) diameter WHAT DO THE DIFFERENT COLOR ENGINES MEAN? Each type of engine is printed in a different color: Single Stage - Green Upper Stage - Purple (Upper stage engines can be used as single stage engines in lightweight rockets.) Booster - Red (Booster engines contain no delay or ejection charge.) Plugged - Blue (Plugged engines are used for R/C gliders and contain no delay or ejection charge.) Each engine has a letter-number-number code. (e.g., B6-4) Letter: B Number: 6: Number: 4 CLAY NOZZLE PROPELLANT FOR LIFT-OFF AND ACCELERATION DELAY FOR COAST PHASE AND TRACKING SMOKE EJECTION CHARGE TO ACTIVATE RECOVERY SYSTEM CLAY RETAINER CAP PAPER CASING B6-4 E9-4 A10-3T B = TOTAL IMPULSE This letter is the total power (in Newton-seconds) produced by the engine. Each succeeding letter has up to twice the total power as the previous letter. (Example: "B" engines have up to twice the power of "A" engines, which results in approximately twice the altitude the rocket will reach.) 6 = AVERAGE THRUST This number shows the engine's average push or how fast the engine powers the rocket to go. The higher the number, the faster the speed. It is measured in Newtons (4.45 Newtons = 1 lb.). 4 = TIME DELAY This number gives you the time delay in seconds between the end of the thrust phase and ignition of the ejection charge. Engine types ending in "0" have no time delay or ejection and are used for booster stages and special purposes only. 1.75 in. (4.4 cm) long 2.75 in. (7.0 cm) long B6-4 2.75 in. (7.0 cm) long D12-3 3.75 in. (9.5 cm) long HOW DOES A MODEL ROCKET ENGINE WORK?