RE: RC Surfer
As the surf has been sloppy and onshore for about the last month, decided to play around with the fin system as a lot of you guys are using single fins and I have always used the original fin and just added a little super glue to the rudder are to make sure it doesn't move out of place. Also i found the rudder always had a bit of slop and wanted a solid fit around the fin strut.
Anyway, after trying a home-made fin (a piece of plastic cut to shape, 4mm stainless steel shaft cut down and filed, put in place with epoxy and then fiberglassed) I found that the surfer did not skim across the water smoothly but had some bounce and when on the wave face it would lean over a lot as the fin was lifting upwards through turns.
So I put a horizontal wing in at a downwards angle on the fin (similar to the original design) and it is amazing. It hugs the wave through some seriously fast turns and has no bounce when skimming across the water.
Now, my surfer weighs a lot (2.1kg) as I use large batteries and had to put some extra weight up the front to balance it out, so those using lighter surfers may not experience the bouncing as I have.
To eliminate any rudder slop, I used a 6mm propshaft tube which fits perfectly in the rudder slot, and using the original 4mm, it has a perfect fit.
However, the uncut end of the propshaft tube fits a 4mm perfectly, but the cut end has a slightly wider diameter (the ends of a propshaft are 4mm, but inside the tube its 5mm)
To fill that gap, I cut the end of a 4mm bullet connector and it surprisingly it fits over the rudder strut perfectly and then slots into the cut end of the propshaft tube just as nicely. It does not have any slop or movement. And for the first time ever, not one drop of water got into the rudder compartment.
For those who want to stop their rudder sloppyness, this works great and being a propshaft tube, add a little grease and it has absolutely no resistance when turning. I found that the original fin was being pushed back from the force of the water when surfing and it put extra pressure on the servo and sometimes the rudder would not return back to being in perfect alignment.
Anyway, this is me just playing around and throwing a few ideas around, maybe someone has a much simpler and more effective idea ; )
On a different note, I blew up an ESC on the weekend, after removing the silicon on either end of the ESC (this is the best way to truly waterproof your ESC) I found water inside the ESC, which shocked me as there was not a drop inside the board. After closer inspection, i found that one of the tubes that you attach your silicon tubing to has started to undo itself from the cooling box in the ESC and water was dripping inside which in turn blew it up!
So check your Seaking ESC and make sure those two water tubes are screwed in tight!
Below are some pics of the fin and parts so you can understand what I was talking about a lot easier.