Quick Answer
Charge wells hold your black powder ejection charge in a fixed position inside the airframe, ensuring consistent ignition and preventing the powder from shifting during flight.
Why Use a Charge Well Instead of Loose Powder?
Loose black powder can settle into the bottom of the bay or spill out of a tape wrap, leading to weak or failed ejection. A charge well keeps the powder centered near the bulkhead, so the igniter reliably lights the full charge every time.
The trade-off is that you need to match the well diameter to your airframe. A well that is too small leaves the charge exposed, while one that is too large may not fit through the bay opening.
How to Pick the Right Size
Charge Wells come in three sizes: 3g (23mm OD) for 3" and 4" kits, 5g (26.3mm OD) for 5.5" airframes, and 7g (29.3mm OD) for 7.5" rockets. All are 29mm tall and sold in pairs.
If you fly multiple rocket diameters, consider buying a set of each size so you always have the right fit. The 3g size is the most versatile for mid-power and smaller high-power builds.
Frequently Asked Questions
Do I need a charge well for every flight?
Not strictly, but if you fly in windy conditions or have a long boost phase, the powder can shift. A charge well guarantees the charge stays where you put it.
Can I reuse a charge well?
Yes. PETG withstands multiple firings. Just clean out the residue after each flight and check for cracks before reuse. Inspect the well after every few flights for wear.
What size fits my 4" rocket?
The 3g well (23mm OD) is designed for 3" and 4" kits. It fits snugly inside the airframe without blocking the recovery harness.
Product Facts
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Charge Wells: Printed in-house using PETG filament with a center mounting hole for #8 hardware, sized for 1/4" bulkheads. PETG is impact-resistant and won't shatter under the pressure of a black powder charge, and the pre-drilled hole saves you drilling time.
Charge Wells
