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Quantity
1
Description
The B6-4 is a widely trusted and well-balanced engine that offers reliable performance across a variety of model rocket kits. With a moderate level of thrust and a 4-second delay, it allows rockets to coast effectively before activating the...
Reviews
4.9
35 ratings
5
4
3
2
1
You can count on Estes engines for a super reliable flight. Fast delivery too.
R
Robert · July 15, 2026
Nice
J
JOHN · August 8, 2026
These are great, I use these when a c6-5 will send a rocket way past 500 feet
