Bullnose props are popular among mini-quad racers and I was curious what they were like to fly with. After some success in cutting down my own props I decided to share my method for making them. It’s quick. It’s easy. And it gives consistent results from prop-to-prop while leaving a clean edge that requires little dressing for a smooth finished tip.
|Watch the complete video|
My original thought was to get one of the 3D-printed jigs I’ve seen for doing this, or try to build my own jig from metal or wood when it dawned me (in a very ‘well duh!’ moment) that I already had everything I needed. As an aside, I prefer this method over fixed jigs because it allows you to create any length you want. Over the weekend I used this same setup to cut down some 11-inchers to 10-inch for my XuGong.
It should be pointed out that the single most important component of this method is the cutting bit. I’ve seen people recommend the Dremel #569 tile grout removal bit and the Dremel #562 tile cutting bit but to be honest, neither of those is suitable for cutting the type of soft plastic used in multirotor props. The problem is those bits aren’t designed to ‘cut ‘ material, they’re designed to ‘grind’ it away and applying them to a plastic prop just leaves the edge frayed and ragged.
What’s need is something that actually cuts — or in this case ‘shaves’ away the plastic — so that the finished edge is relatively smooth and free of burrs and a helical cutter like the Dremel #9901 Tungsten Carbide Cutter nicely fills that requirement. Once cut to length the prop tips can then be easily clean-up with 150 grit Wetordry sandpaper and water (this type of sandpaper is normally found in automotive supply stores in the paint section).
Tools used in this video:
- WEN 2307 Rotary Tool ($19)
- Dremel 220-01 WorkStation ($40)
- Dremel 9901 Helical Cutter ($9)
- Drill Vise ($15)
- 5mm Drill Bit (whatever size fits your prop hub)
- 150 Grit Wetodry Sandpaper
Prices shown are the retail prices I actually paid.
Did you find this post helpful or informative? If so please consider donating to CradyLab™