He's very smart, He didn't loose the line completely, He locked it but loosen it that's why it don't get tangled, Definitely easiest way to do it for fishing and it's cheapest solution but Balance will be an issue, If you use small bait there won't be an issue, If you use 80lbs line like I do then its going to be risky.
One thing I'm not sure is How much weight P4 can lift up, It would be interesting to know, I seen one video comparison between p3 & p4 and the P3 carry much better than p4, but again I don't think anyone going to use 2lbs as a bait lol unless they going to smuggle drugs
Once I complete the design I'm going to test how much weight P4 can take, And for every 25% of the total weight I'm going to test how much flight time in Minutes does p4 compromise