Triangle Brackets for Zip Ties

I designed these brackets to help in the rapid construction of RC airplanes + boats. I use coroplast for rudders, motor mounts, and decks, and using these brackets I can simply zip-tie those pieces at 90º angles to each other, with a decent amount of strength.

I've currently got three variants: 5x5x5cm, 4x5x7cm, and another 4x5x7 with thicker walls. If you have an Onshape account, you can customize the parametric model to your heart's delight [here](https://cad.onshape.com/documents/e9b6c4027