Propellers and Ducts


#167

Excellent!
What is the diameter and the delivery time to the EU?
Thanks


#168

diameter its 135mm and high pitch.

3 blade prop 3200 rpm SPORT WING more then 40 km/h


#169

And 3 different colors:

RED
GOLD
BLACK


#170

Is the 3 blades with the highest pitch?
Can I order one?


#171

Is it real shaft rpm under load?


#172

3500 Theoretical
3100 - 3200 Water


#173


#174

Pic of the pin mount please, and how the shaft has to be? ( i ve just glue mine to the gearbox…)


#175

SHAFT ø10


#176

Sorry how long needs the shaft to be ?
Base diameter 60mm?


#177


#178

That is perfect for my set up :slight_smile:


#179

Hello
What’s the pitch of 3 blades? And 4?


#180

3 blades black please


#181

Aparrently there is such a thing as a safety propeller. The blades are rounded and the inventor can be seen sticking his arm and fingers in without any harm. Efficiency loss is claimed to be very small. This would allow us to safely remove the duct and have the efficiency too. I would try with some fruit and veggies before
trying with my body parts, but worth trying.


#182

There’s no real reason you couldn’t do this for DIY. I still think for commercial units they will sell with duct though as there less chance of people bruising and suing.


#183

So far I haven’t seen a duct that keeps fingers and toes out. Even the jet designs have finger access to the prop. This may well be the safest option especially in combination with a simple/low drag prop guard.


#184

Are you worried about getting your fingers in there? Or will you use them with “Noobs”?


#185

Interesting, wonder how the prop performs with thick, round leading edge. Looks like reverse is not good for fingers, the trailing edge lookes sharp. Keep us posted, this is at least a better option than open regular outboard props.

With the duct we use now with 6 struts, its not possible to reach the prop(from the front) with fingers/toes as long as you use booties and keep your hands closed in the water.

But if they first get in there the result could be bad, as it will be “trapped” in there.


#186

Hi Hiorth

Did you get much better efficiency from the rice nozzle? I like you duct design
what size is your prop? I’m looking at around 136mm. How much gap did you leave from prop to inside of duct. I see pictures of some and the gap is large which would cause big inefficiencies.