tatman

I'm building a shark fin with twin motor / propellers. I'm not looking for speed and would rather steer by variable speed to the motors than a rudder. I haven't rigged this before and am not sure how the electronics work. I'm using a Flysky FS-GT3B controller. I have 2 speed controllers. Without a rudder I can use a servo to rotate the motors up and down for a variable depth of the fin in the water. I don't plan to submerge it but just a bit of up and down will be great. Any Help? Thanks

Got RPM

We don’t have near enough information to help you. What size fin, dogfish or great white? What motors and ESCs? What voltage? What speed do you want? Where will the motors be placed, if placed in the rear the fin won’t submerge well by just rotating them up.

tatman

I'd have to say Great White. It's about 2' out of the water. Motors are 7.4V 16800 RPM CW CCW. I have a FPVKing Dual Way ESC 2s-3s. 2 X 30A speed controllers 7.4 5200mah Lipo Batts. Like I said speed isn't really a thing. I just want to circle the cute Swan paddleboats at my nearby pond. I am at starting / design stages and thinking out motor / fin placement. I found an electrical diagram on line for wiring the Dual Way that made sense. Thanks for any architectural / electrical help.
I should also mention, as a disclaimer, I live in Colorado, far from salt water where this would NOT be a funny joke.

Oh and also I have a 1060 60A waterproof ESC

cheapsub

Think of a sailboat setup, with out the boat part showing.
some PVC pipes make it in to a "t", rubber end cap for easy replacement of battery.
motors at the bottom of the keel (motor can run underwater just wd40 after each run), 3 to 4 inches apart. For steering.
if you are using 2.4GHz, put the receiver as high as you can on the top of the "t".
Others then fin you could put in a alligator head too.
added: this should help
https://www.rcgroups.com/forums/showthread.php?1537093-Empire-State-Model-Mariners/page696#post35702957