ProBoat "RiverJet" Jet Nozzle Sleeve
thingiverse
The "River Jet" from Proboat is a great little boat. However it's widely acknowledged that the Jet Nozzle is too big, making the steering twitchy at best. Proboat said they chose the nozzle size based more on Aesthetics than performance and while it DOES look great, it needs fixing. This is the simplest of 3d designs but works great. Designed to be an interference fit, this sleeve will press into the throat of the stock nozzle and will transform the steering performance of the boat. You'll have to remove the nozzle to install the sleeve but it's still just a 5 minute job. The tapered end of the sleeve goes at the front [forward] part of the nozzle.
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