A properly fitted spinner is more than just a finishing touch on your RC airplane—it plays a key role in performance, aerodynamics, and propeller balance. DU-BRO spinners are known for their durability, clean styling, and ease of installation, but like any precision component, they work best when selected and fitted correctly. Whether you fly electric, nitro, or gas models, trimming the spinner dome and balancing the assembly ensures smooth operation and protects your power system.
This DU-BRO 101 guide walks you through the recommended method for choosing the right spinner size, modifying the openings to match your propeller, and balancing the final assembly for vibration-free performance.
DU-BRO offers a wide range of spinner styles, colors, and diameters to match nearly any aircraft.
Step 1: Select the Right Spinner for Your Model
DU-BRO spinners are available in several colors, and you can also paint them if you prefer a custom look. If painting, scuff the surface lightly and apply primer to help the paint adhere. Keep in mind that electric starters may eventually rub the paint off, so factory-colored spinners are often the most durable choice.
When choosing the proper size, select a spinner roughly one-fifth the diameter of your propeller. For example, a 12-inch prop pairs well with a spinner around 2.25" to 2.5" in diameter.
For new pilots or builders upgrading an airplane, DU-BRO provides spinners in multiple mount styles compatible with most glow, gas, and electric setups.
Step 2: Measure Cut Depth and Blade Width
A perfect spinner fit requires cutting the propeller openings to the correct depth and width. Start by measuring:
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How deep the propeller blade extends into the spinner
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How wide the blade root needs the opening to be
Use a ruler or calipers for accuracy. Once you know your dimensions, use a fine-tip marker to draw trim lines directly onto the spinner dome. Focus on removing the leading-edge portion of the plastic while preserving the spinner’s natural arch.
DU-BRO cutting and trimming tools make this step easier and cleaner.
Step 3: Cut, Fit, and Refine
Carefully cut along your marked trim lines using sharp scissors or a rotary tool. After each cut, dry-fit the spinner onto the propeller, checking blade clearance and appearance. This back-and-forth process ensures a perfectly blended opening that looks clean and performs well at high RPM.
If necessary, widen the opening slightly until the propeller spins freely with no rubbing.
Step 4: Balance the Spinner Assembly
A smooth-running spinner reduces vibration, protects your bearings, and improves overall flight performance. DU-BRO recommends using the Tru-Spin Prop & Spinner Balancer, a precision tool designed to balance both the spinner backplate and the dome.
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Balance the backplate alone first
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Attach the spinner dome and balance the full assembly
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Adjust weight or material as needed until it stays level when released
Ready for a Perfect-Fit Spinner?
With the right measurements, careful trimming, and proper balancing, a DU-BRO spinner adds strength, efficiency, and a professional finish to your RC airplane. It’s a simple upgrade that delivers smoother flight and better protection for your motor—proof that small parts can make a big difference in performance.
Here's our suggested method:
- Select the color of spinner needed for your model.
- You can paint Du-Bro spinners by scuffing the surface and using a primer to help promoting paint adhesion. Electric starters will rub this off over time.
- Select the size of your spinner roughly 1/5 the diameter of your propeller.
- Use a ruler or calipers to measure the depth of how much you should trim from the opening for the propeller blades.
- If needed, also measure how much you should widen the opening for the propeller blades.
- Use a marker along with your measuring tools to create a cut line on the spinner dome, focusing on removing the propeller leading-edge portion. Try to blend the cut line with the arch of the opening.
- Cut and dry fit the propeller until you are satisfied with the fit.
- Balance your spinner with the Du-Bro propeller and spinner balancer.
- Balance the spinner backplate first by itself and then with the dome.
