RC Airboat
thingiverse
length: 20 cm print it with backside on the ground, 7% infill and Support. the weight is ~150g. rc stuff here: https://www.amazon.de/85662-Silverlit-ferngesteuert-Flugzeug-farblich/dp/B000EG5ZXM/ref=sr_1_6?hvadid=80195661131289&hvbmt=be&hvdev=c&hvqmt=e&keywords=silverlit+flugzeug&qid=1559053225&s=gateway&sr=8-6 build out the electronics and put them into the boat. Have fun! ;)
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