AEROKITS FAST PATROL BOAT SEA TRIALS
High pressure and calm conditions yesterday evening gave me perfect conditions for initial sea trials of my little fast patrol boat on our local lake.
As you can see from the video below the tiny out-runner brushless motor used has a amazing amount of power. I used the smaller 2 blade propeller and even half throttle brought the little fast patrol boat onto a scale like plane.
Coming back to the original question posed by this thread What Watts/Kg ? I would conclude that in my case a good rule of thumb would be 50 watts/kg for a sports model boat like this.
MY TRANSMITTER SET UP.
I found setting the rudder up at 50% on the transmitter aileron rate switch was ideal for cruising around I then flicked the switch to full throw for slow speed manoeuvring this worked well for me.
I also set up a timer for 15 mins but even after a 20 minute run there was plenty of power left in the 2200mAh 3 cell LiPo pack so this power train set up works well.
The original bath test caused the motor to overheat. I have now rectified the problem by carrying out the following 3 steps below.
MOTOR PROP-SHAFT ALINEMENT. Although this was originally OK, I have fine tuned it by using some cuttings of old credit cards as shims to pack up the motor mount.
PROP-SHAFT LUBRICANT. Originally I was using old school grease. There is a great guide on drive trains (by Glynn Guest) on the Model Boat Magazine website. As a result of reading the article I removed the grease, fabricated a prop-shaft oiler, and I am now using 3 in 1 oil to lubricate the shaft.
These two steps have really reduced the prop-shaft drag and friction thus reducing the noise the motor makes and the power it draws.
WATER COOLING was also installed and the motor mount modified (see picture below). If it helps others I can add a new thread on fabricating a home brew water cooled motor mount.
To conclude I had a great evening at the lake as the Fast Patrol Boat preformed well. As for the little DYS D2822-17 brushless out-runner motor it now runs cool, it produces a lot of power, and it is very efficient. However, I did have to take time and care with the installation.
I would like to acknowledge the help of my daughter Libby who took the great pictures with her iPhone JT 😊