Designing a ping pong launcher with one spring and adjustable angle/height using only PVC pipes presents significant challenge. However here are two potential approaches you can explore along limitations to consider: 1. Lever Plunger Hybrid: Materials: Long pipe for launch tube (diameter slightly larger than ball) Short lever arm (1/2 the length of tube) T-fitting connect Strong (consider compression strength safety) Ping ball holder (3D printed or adapted from wood/plastic) Screws nuts bolts attachments Design: Attach side near its base. Connect bolt allowing free rotation angle adjustment. Fix end other fixed point on Secure tube. Mechanism: Rotate compress spring adjusting as needed. Push down plunger-style ball. Limitations: Adjusting while maintaining tension requires practice may affect consistency. Achieving height limited storage might be difficult. 2. Inclined Launch Tube Trigger: Two different diameters (larger base smaller Elbow fitting at an stopper (adapted Trigger mechanism (lever button) base elbow fitting. entrance. Design that holds entrance releases trigger activation. Adjust control. Pull press release