Homebuilt ROVs Forum

Hello guys, i'm trying to build my very first ROV. First of all, i'm working on thrusting. I got this guy, http://www.hobbyking.com/hobbyking/stor ... 850kv.html , and as a propeller, i got the propeller of a fan. But, it didn't work out well when testing in water. The motor stopped as soon as i speed up a little. I have a lot of things as my suspect of this failure. The propeller or the rpm of the motor? I'm aware that the pitch of the propeller i used is quite big though. Plz give your advice on my case.

The expected dimension of my ROV is 50mmx30mmx35mm, around some where there. Expected depth to dive is around 3,4 m. I would like to know which dia, pitch and no. of blades of propeller should i use in vertical thruster. Plus, which KV and Watt motor do you suggest to use? Btw, i'm planning to use 3 brushless dc motors, one for vertical and two for fwd/rev.

Hoping for your advice.

The motor stopped as soon as i speed up a little.

Sounds as temperature or overload-action by the esc.... What ESC (ampere) you use? Which ESC?

50mmx30mmx35mm

That's a really really small ROV is it for drain pipes?

ROVER3D wrote:

The motor stopped as soon as i speed up a little.

Sounds as temperature or overload-action by the esc.... What ESC (ampere) you use? Which ESC?

I used this one, http://www.hobbywing.com/product_show.asp?id=290 .

kenl wrote:

50mmx30mmx35mm

That's a really really small ROV is it for drain pipes?

ha ha, may be. This is my first one so i really have no idea how big my ROV will be. It might become 2-3 times of that size after a month or two.

brang wrote:

ROVER3D wrote:

The motor stopped as soon as i speed up a little.

Sounds as temperature or overload-action by the esc.... What ESC (ampere) you use? Which ESC?

I used this one, http://www.hobbywing.com/product_show.asp?id=290 .

Well, independent of the not running problem, don't you want an ESC with reverse?
That one being for aircraft is forward only I believe.

scubersteve wrote: Well, independent of the not running problem, don't you want an ESC with reverse?
That one being for aircraft is forward only I believe.

I'm planning on using reverse esc. It's just that i'm testing it out with what my friend has. Do you find anything in particular that was wrong?

It does sound like a problem with the ESC.
Try removing the prop and running just the motor in the water.