Fly Gun

grabcad

A toy pistol for shooting mosquitos and similar insects, which are sitting on a wall or any other solid objects (give creatures a chance to escape, if you don't hit them).The "projectile" has a shape like a spider's web.The force for acceleration the "projectile" is a compression spring,fastened on the "projectile" itself.This little trick increases the mass of the "projectile".The trigger lever is designed as a film hinge, supported by a compression spring. This additional part increases the safety for locking the loaded »Fly Gun«Some technical details:Fastening thread = M12,5 x 1,5 mm (modeled without clearance)Neutral length of the compression spring ("projectile") = 58 mm (as modeled only)Neutral length of the compression spring ("trigger lever") = 14 mm (modeled in mounted state only)Material of the plastic parts: »ABS« or similar (for 3D-Printing)Available 3D-Data:Native files in a zipped folder for PTC-UsersSTEP-file of the complete assemblySTL-files of all plastic componentsA last hint:You should fasten a »PERLON-thread« with a length of approx. 1 meter, on the "projectile" and the "pistol", to avoid a search for the "projectile" after shooting.For a scientific study, the following calculation formula:F x t = m x Vo(Force [N]) times (time [s]) = (Mass [kg]) times (Initial Velocity [m/s])For example:F x t = constantIncreasing mass --> decreasing initial velocity (inverse proportionality)For the special application (Fly Gun) the force of the compression spring is not constant over the expansion way, the expansion time is unknown and therefore a calculation is not quite easy or even impossible.Would a FEM-Analysis get approximate results of the initial velocity?If "yes" you can easily calculate the inital energy of the projectile:[ E0 = (m/2) x (v)^2 ]Likes and/ or comments are appreciated.