B4-4 Engines

B4-4 Engines


3 – B4-4 Engines
4 – Starters
4 – Starter Plugs

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Availability: In stock


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The Estes B4-4 engine is single stage engine designed for model rocket flight. This engine is a standard engine designed for flights in rockets weighing less than 3.5 ounces, including the engine. Each package includes 3 engines, 4 starters and 4 plugs.

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2.8 in. (7 cm)


18 mm

Estimated Weight

.68 oz. (19.3 g)

Total Impulse

5.00 N-sec

Time Delay

4 Seconds

Estimated Max Lift Weight

3.5 oz (99 g)

Max Thrust

13.20 Newtons (3.0 lbs)

Thrust Duration

1.10 Seconds

Initial Weight

0.68 oz (19.2 g)

Propellant Weight

0.27 oz (7.6 g)

Quantity Per Pack


5 reviews for B4-4 Engines

  1. Lyrik

    Great for kits and home builds!!!!

    These engines work amazingly on all my estes kits and all my homemade rockets it launched my 1.9 ounce rocket to WELL over 800 ft!!!

  2. rOcKeT mAn

    Great Engine for smaller Rockets!

    I used this engine on my HI Flier and it keeps it low enough no to lose it, but still gives it the thrill of any high flying rocket!

  3. Damon


    this is the first engine i used and it was great

  4. rocket master

    BLAST OFF!!!

    These B4-4 engines are amazing. The engine has a burn time perfect for medium sized fields. With this engine you will amaze family, friends, or even your neighbors.

  5. David

    Low and slow is the way to go!

    Flying this in my Patriot M104 kit is a lot of fun! It has a slightly lower thrust than the B6 but a longer burn, giving the kind of dramatic flight I enjoy in some of my models like my Patriot kit.

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