Large 'Pull String' Spinner

this toy spins up these two propellers really fast to store energy like a flywheel which when released launches it high into the sky now i explored this system in a previous video where i attached a propeller to the front of a small glider and the great thing about the launch mechanism for these spinners is a super simple yet effective design as the spinner or propeller is accelerated it's held down by these interlocking teeth then when the motor decelerates the teeth disengage and it's launched into the sky unless of course the propeller decides to take its own plan of action now in order to give one of these spinners some altitude we need to give it energy and in this case it's in the form of rotational energy rotational energy is a product of the rotational inertia of the propeller and its rotational speed squared this means if we double the rpm of the propeller we quadruple the energy now these small spinners go pretty high but in order to get some more altitude i think we need some more inertia so i started by machining a 40 millimeter diameter three bladed design from a two millimeter sheet of aluminium this will act as a structural frame of the spinner and i can then 3d print some error full sections that will bolt to it then with a large launch adapter attached to an even larger motor it was time for a quick test which proved successful apart from the slightly damaged launch adapter time to give it some more rpm right you ready i'm gonna release it three two one whoa and it looks like i need some more space so i attached an aerodynamic nose cone to it and headed out into the field that's maybe sixty percent three two one that goes pretty high oh hopefully it lands all right okay so because that's not traveling too far in terms of possibly leaving this field i think we should uh ramp it up a little okay i'm going to ramp up the full throttle and straightaway release wow that's high i love how you can tell that it's gone in spinning and this grass has just like been pushed down this way in this way just to like slow down the rotation so i don't currently own a motor large enough and high enough rpm rating to spin this thing any faster and gets more altitude so i think instead of firing it straight up we should fire it horizontally when i launch the smaller spinners horizontally they travel quite far as if they are gliding through the air [Music] i believe this is because the outer ring surface is acting like a wing and produces lift however the large spinner doesn't have this therefore i need to angle it upwards at 40 degrees so the thrust produced by the spinning blades keeps it from dropping to the ground or hitting the fence now let's see what it does at full [Music] [Applause] throttle it is like i love seeing the slo-mo of this thing vibrate like crazy as the launch adapter isn't perfectly central then once it's released into the air it just smooths out and glides away okay so we've seen how high it goes and how far it goes maybe it's time for some destruction so that long grass was a nice soft landing for the spinner but how about we try it onto some slightly shorter grass [Music] i think they might have broken it so there we have it a slightly more powerful more dangerous children's toy um thank you very much for watching if you enjoyed this video please leave a thumbs up down below if you're new to my channel and want to see other weird projects like this then please click subscribe down below a massive thanks to all of my supporters over on patreon.com you guys seriously make these videos possible so thanks once again thanks again for watching and i'll see you in the next video goodbye

Channel: Tom Stanton

Views: 1,445,116

Rating: 4.9343309 out of 5

Keywords: flywheel, projectile, spinner, physics, 3D printed, propeller, drone, motor, engineering, rocket

Id: uE25TnldPok

Length: 5min 38sec (338 seconds)

Published: Wed Jun 03 2020