Uploaded November 2025 | Updated September 2026, 1 week ago
ApogeeRockets.com -
When you open up a rocket kit, have you ever wondered why the engine mount looks the way it does? specifically, why do some heavy-duty kits use two centering rings, while others use three?
It isn't just a matter of spare parts—it’s a specific design choice that changes how you build the rocket and how strong it ultimately becomes.
What you’ll learn in this video:
🚀 The "Through-the-Wall" Factor: Why surface mount fins are simple, but through-the-wall fins require a specific strategy for internal strength.
🚀 The "String Trick": See how the Zephyr kit utilizes a removable two-ring system (and a piece of string!) to allow access to the inside of the airframe.
🚀 The Three-Ring Method: Discover why the Mako kit uses a third ring and how it simplifies the process of applying internal fillets.
Why is this important for you?
If you are designing your own model rockets or scratch-building, structural integrity is everything. The secret to rock-solid fins is getting good internal fillets.
This video is essential viewing for designers because it shows you two distinct ways to engineer your mount so you can actually reach inside and apply those fillets correctly. Whether you prefer the clever engineering of the two-ring method or the "peace of mind" simplicity of the three-ring method, understanding the difference will make you a better builder.
👇 LINKS & RESOURCES 👇
Shop Centering Rings & Mounts:
apogeerockets.com/Building_Supplies/Centering_Rings
The Best Epoxy for Internal Fillets:
apogeerockets.com/Building-Supplies/Adhesives/G-Flex-655-8-oz
Read the Article / Newsletter:
apogeerockets.com/Peak-of-Flight?pof_list=archives&m=education
ApogeeRockets.com -
When you open up a rocket kit, have you ever wondered why the engine mount looks the way it does? specifically, why do some heavy-duty kits use two centering rings, while others use three?
It isn't just a matter of spare parts—it’s a specific design choice that changes how you build the rocket and how strong it ultimately becomes.
What you’ll learn in this video:
🚀 The "Through-the-Wall" Factor: Why surface mount fins are simple, but through-the-wall fins require a specific strategy for internal strength.
🚀 The "String Trick": See how the Zephyr kit utilizes a removable two-ring system (and a piece of string!) to allow access to the inside of the airframe.
🚀 The Three-Ring Method: Discover why the Mako kit uses a third ring and how it simplifies the process of applying internal fillets.
Why is this important for you?
If you are designing your own model rockets or scratch-building, structural integrity is everything. The secret to rock-solid fins is getting good internal fillets.
This video is essential viewing for designers because it shows you two distinct ways to engineer your mount so you can actually reach inside and apply those fillets correctly. Whether you prefer the clever engineering of the two-ring method or the "peace of mind" simplicity of the three-ring method, understanding the difference will make you a better builder.
👇 LINKS & RESOURCES 👇
Shop Centering Rings & Mounts:
apogeerockets.com/Building_Supplies/Centering_Rings
The Best Epoxy for Internal Fillets:
apogeerockets.com/Building-Supplies/Adhesives/G-Flex-655-8-oz
Read the Article / Newsletter:
apogeerockets.com/Peak-of-Flight?pof_list=archives&m=education
