Took the cruiser out today as well, to try the new coupling I made, and test the new downrated motor. Now using a 550 80T as opposed to the 550 45T previously. Runs very quietly now with almost 0 vibration and a more scale top speed.

Perhaps not a boat, but no pond is complete without one of these gems.
This lighthouse is fully remote controlled.
The lamp rotates at 12 rpm allowing a flash of light every 5 seconds.
A 5kg weight is mounted under the island and winched down to the bottom of the dam to anchor the island. The winch is powered by a 6V Ryobi Cordless Screw Driver's gearbox and motor.
The Fog Horn is operated by a 9V motor with a counterbalance causing a vibration inside the tower, amplifying the sound effect of a steam horn.
It's built at 1:35 scale and stands 80cm tall.

Second test was slightly better, using the aluminium spiral cut universal which came with the jet unit. As you can probably hear, it was horribly out of balance (even with cable ties to reduce it). It was not even drilled centrally and the spiral is right hand when it should be left hand, (like a spring twisted against the wind, it wants to deform). Slight improvement in speed on the first test (no slip this time) but the noise was horrendous.

Have pulled the jet apart and found that the 3 blade prop is around 1 mm too small for the hole, causing cavitation (see loads of bubbles in the jet stream) which is causing loss of thrust. The prop is the wrong type as well, with rounded blades, so I have modified a larger prop with more pitch to fit snugly in the unit to hopefully increase thrust. The shaft is also wrong, with a flat cut almost half the diam and carrying on through the bearing, allowing the grease to fly out.

I actually saw a Chinese site on Al Expr stating that "some dimensions on the product may be different due to the number of machines and operators involved in its' manufacture," SERIOUSLY!!??? their quality control must be utter crap and the operators not skilled enough to eat their lunch😐 Why bother having a dimension at all?? Little wonder nothing fits properly.

Unfortunately, most model shops sell the very same stuff, unless you want to shell out muchos dolleros for European stuff. I have just ordered some 4mm silver steel to make a new shaft, so a coupling or silicone tube will fit better. Also ordered some solid connectors to try. Vibration is wasted energy so it needs to be eliminated. Hopefully the mods will improve things and allow the motor to run on 4s rater than 3s. Worked out that the motor is only 1200KV, so it's only doing around 13,000 rpm under load. Probably will need around
18,000 rpm for proper performance. Onwards and upwards (or forwards as the case may be.😁)

Sorry about the blurry vid again, but my camera lens is knackered.

Some 25 to 30 years ago I wrote to Peter Dimberlins for details of the Crash Boat following a mention of him in 'Model Boats '. Peter supplied me with data and we have been so close ever since. These and more Images are of Peter at the helm of my Steam boat' Lady Halina ' and his successfully (ha ha) steering my Crash Boat as I did not know it was so fast/ ballistic. More pictures to follow of this gracious man at the helm at our pond/ tidal creek during his momentus visit to OZ in early 2008. My model is some 30 years young and is with the third engine as the others were worn out with use ( OS35, ENYA35 now a S/C 40 a bit too much) in a 25 pound plus model, yes she is heavy. She has been re done over and over(paint resin paint resin etc) and only had the 1/8 inch steel prop shaft (yes 1/8) replaced recently. I have a "leather flange coupling"as on all my power boats and never let me down and vibration free. Exhaust system 1:muffler to a 2.tar lined tin can to a 3.small resonator (equals quiet ) More to come of my Crash Boat as a result of this gracious man and his service to modelling even to a colonial.