Hello, First of all, this is my first post on this forum and English is not my primary language... So their's might be some spelling errors. For this build, I want to start experimenting with a dual deployment technique that the France Tripoli prefet teach me. Here is how it works. When the apogee is reached, the parachute is ejected but still hold close by a nylon string. At 100m, the E-Match is ignited which melt the nylon string and deploy the parachute. Seem pretty simple.. I will also use this rocket to test the GPS that I'm working on with a friend. It will use LoRa to communicate to a ground station and track the rocket. Here is a screenshot of the OpenRocket design. This rocket will be made out of Carbon fiber and the nosecone will be made with fiberglass and a custom made nosecone mold. Boat-Tail: The boat tail will simply be made of 2 parts: one 24mm int.dia cf tube and one 26mm tube. I had to sand down the boat tail by hand. To prevent delamination, I applied a thin coat of JbWeld on the inside. The boat-tail part will also act as motor retention. The motor ejection charge will not be used so friction fit might be enough but this is what I did. I added some JbWeld on the inside to add materials for the screw to bite on. A simple screw is used to hold the motor in place. This work with Cesaroni and Aerotech hardware. Fins: The fins are made out of 2mm thick carbon fiber plate. A Jig Saw with a small teeth metal blade do a perfect job at cutting carbon fiber plate without delamination. It's a bit hard to get a perfectly straight line but once you get your hands on it, it becomes pretty easy. Now time for the airfoil. I first marked a line at 7mm from the fins edges. This will be my reference line for the sanding. Simply by using 120 grid sandpaper and a sanding block, you can get the rough shape. and here is the final fin! Now 2 left to do... Fins Slots : Fins slots were pretty tricky to do because I don't have the right tools to works with carbon. Here is the setup Just a simple drill press... After drilling pre-holes, I used a Dremel diamond sanding bit to finish the slot. And here is the result without sanding. As you can see, it is not perfectly smooth but it will help when I will be gluing the fins in place. I was able to get a near perfect alignment without even holding the fins in place! Here is the final picture of the progress for today, I will keep this thread updated on my progress as soon as I have time to continue this rocket! Stay Tuned! PS: I still haven't found a name for this rocket, so if you have any ideas, let me know!