I made the thicker version of the torp this afternoon, I increased the rubber band length by adding another piece, the torpedo body has been lengthened as well. Anyways, the torpedo works successfully in the water, I added a series of fins on the side of the tube to stabilize the run, the end of fins are bent at an angle to contribute to the speed (Thanks for reminding, pkh!
). It's very cold out there, the water is FREEZING COLD, my hands are still getting the chills[&:][&:], oh well, building torpedoes is not without its casualties...
Here are pictures of the Pentorp V2!!