3 inch Prop Duct

Prop duct for 3 inch props.

This was designed to be used on the Acrobrat frame but may work on others.

Please note that this has been uploaded as requested by many people who have viewed images of my ducted-brat setup. there may be some fouling on the frame that needs to be trimmed.

For best results, use bullnose or cut down 4" props.

Depending on your printer settings, you may need to sand the internal diameter. I would prefer it this way to ensure a tight fit as any gap to the prop reduces the performance of the duct.

Please let me know if your thoughts or if you've used the ducts.

**PS - for some reason, nearly every single one of my designs exports from Fusion360 in the wrong orientation. Obviously this can be rotated and printed 'base down' without supports.