Water pickup locations?

[John P]

Has anyone tried adding a water pickup to their turning fin? I would prefer a dual outlet rudder but so far I haven't found one for the UL-19.
I am thinking of making a brass turning fin and solder the pickup tube to the trailing edge. It will add some drag but not as much as it would
if I just mounted it on the transom. Not sure how well it will hold up but I need additional cooling dedicated to my ESC that gets much hotter
than the motor. Any ideas would be welcome.

[rol243]

i wouldn,t mount the water pickup on the trailing edge of turn fin as you might have steering / control issues due to the excess drag caused . why not just have the single rudder pick up like we all use ? single motor and esc i take it ?

[785boats]

Has anyone tried adding a water pickup to their turning fin? I would prefer a dual outlet rudder but so far I haven't found one for the UL-19.
I am thinking of making a brass turning fin and solder the pickup tube to the trailing edge. It will add some drag but not as much as it would
if I just mounted it on the transom. Not sure how well it will hold up but I need additional cooling dedicated to my ESC that gets much hotter
than the motor. Any ideas would be welcome.

I'm not sure about the fin, but here's what the full size hydros run on their rudders.
If just the ESC is getting hot, get a bigger ESC & just use the single line like most people use.

rudder.jpg

[rol243]

thats the way we used to make up our own water cooled rudder pick ups, stainless steel blade and silver solder a brass tube on the trailing edge with a 45 degree cut just below the rudder bottom.

[fweasel]

RC Boat Bitz makes a dual cooling rudder for the UL-19 and Veles

[CraigP]

Has anyone tried adding a water pickup to their turning fin? I would prefer a dual outlet rudder but so far I haven't found one for the UL-19.
I am thinking of making a brass turning fin and solder the pickup tube to the trailing edge. It will add some drag but not as much as it would
if I just mounted it on the transom. Not sure how well it will hold up but I need additional cooling dedicated to my ESC that gets much hotter
than the motor. Any ideas would be welcome.

I know it’s been tried in Unlimiteds, but created too much turn fin lift. I think that would happen in model boats too.

[CraigP]

thats the way we used to make up our own water cooled rudder pick ups, stainless steel blade and silver solder a brass tube on the trailing edge with a 45 degree cut just below the rudder bottom.

I JB welded a tube to the backside of a rudder in the mid-80’s. It worked great and never broke off! I was going to do that on my new FE boat, but they have many rudders with side ports adequate to do the job. I can put my efforts in another direction.

[martin]

I was of the understanding that a wedge rudder should be flat @ its rear vertical edge, putting a water pick up tube down the rear edge changes the shape to a curved edge creating more drag than a flat edge.

[785boats]

That's true Martin. If I were going to do it, I would use a square section tube, to keep the trailing edge of the blade flat.