Sliding Donut Cross Fitting
Description
This is a multi-part fitting that I have been using for dual lines with a pultruded spine, and a single-piece pultruded lower spreader where that lower spreader needs to slide when the kite is packed away.
This works by having some clip-on bits for the spars, and a flexible donut. When the lower spreader is parallel with the spine, like when a kite is packed up, the donut can be slipped over the clip-ons and slotted into the nock on each part. Rotating the lower spreader with the donut in place will add extra tension on the donut, locking it into those nock positions so the spreader does not shift while the kite is being used.
When disassembling, you can use the pull-tab on the donut to slip the donut back off of the clip-on on the lower spreader, so you can slide the spreader down to keep the spar from sticking out from the rolled up package.
Resources:
| Name | Description |
|---|---|
| Sliding Donut Cross Fitting v8.f3d | V8 of the model exported from Fusion 360 |
| https://a360.co/3CdiH9E | Provides parameters for the spreader and the spine diameters so it can be easily modified to support different size spars |
Priting Notes:
I print the clip-on parts using Ninjatek Armadillo, with the spar slot facing the print bed and no supports.
I print the donut using Sainsmart 95A TPU, lying flat on the bed with no supports.
