I put a small metal 'basket' that I put the float into. It's a fine-tuning thing to allow the line to tow, but 'pop out' with a bit of extra tension.

So we fly it out 200m and then lock the line and it pops out of basket.

Risky, but very fun

Thanks. I'm going to try it

Pro-tip, fly up and out to keep the line safely below the propellors.

There is a huge risk of the propellors grabbing the line and losing the drone far from shore, but in our outing we did a dozen casts with out issue