Diy dpv

[shenzhen]

...actually found quite a bit about ceramic seals...

It’s funny, the phrase “quite a bit” means word for word in Russian “not enough, very little”, but the most dictionaries say, it’s an idioms with the opposite meaning . Anyway, I’d like to suggest you an additional information here, here and of course here.
As you can see, there are many types of "ceramic seal" - carbon graphite, tungsten carbide, silicon carbide, etc.
The most durability can provide tungsten carbide against tungsten carbide seal faces.
I bought carbon graphite against silicon carbide seal, the cheapest but not so bad for high pressure of cold water.

 

[shenzhen]

This is my shaft with mounted ceramic seal.


And I made the bigger propeller. DPV became a little faster

 

[DepthCharge]

Thank you for the additional information.........and the pics of your scooter.
Later,
John

 

[shenzhen]

It's working!

[video=youtube;Fx9v8dfUhFg]http://www.youtube.com/watch?v=Fx9v8dfUhFg[/video]

 

[shenzhen]

We bought 3 new batteries 9 Ah, 2 propellers and made the body more streamlined shape.
The current increased to 23A and 30A.
It's fantastic, now I can fly!

 

[Bhtmec2]

Looks nice for a DIY scooter. What is the thrust for it now max/cruse with the battery and nose changes?

 

[Keith.M]

In one picture you show a 2 bladed prop where in another it has a 3 bladed prop.

Before and after?

 

[shenzhen]

Unfortunately, I don't know the real thrust and the speed. I think it should be correlated with the power consumption.
The first prop (15cm diameter) we bought with was rated 15 Amper 18 lb.
The second (19 cm) I made from aluminum. The current increased to 19A, so the thrust maybe about 19-20 lb.
Now I bought the WaterSnake prop (it's for 24-30 lb models) and cut it from 22 cm to 19 cm. It runs under 23A (at least 23 lb of thrust, I hope)
Also we bought 3 bladed prop (it's for big boats). 30A and it must to be more then 30 lb, but the motor get very hot even underwater.

 

[Tommymac]

Could you let us know where you got the waterproof toggle switch? I have a Tyger Ray that uses a magnetic switch. The diver wears a glove with a magnet attached. The switch has a plastic bubble over the switch, which shattered. Would like to replace it with a no magnetic type switch.

 

[lucca brassi]

It’s funny, the phrase “quite a bit” means word for word in Russian “not enough, very little”, but the most dictionaries say, it’s an idioms with the opposite meaning

.

:banana:


shenzen , may I ask how you made head- cone ( I think which is simpliest way )

- turning from raw material should be expensive

- moulding with some epoxy ( don't have right feeling for walls thicknes and material compression and also resistance on salt water )

-......?

P.S. ( don't tell me some russian balistic missle or some airplane exposable fuel tanks from junkyard )