I was wondering whether we were off topic but looking at the aft streams at 13;50 shown in the video… Then the question is … were those two pictures taken in same conditions (constant and identical speed, boat weight, …)
This would deserve a separate topic. Maybe we could start with a replication of a given N-elongated blade prop with an angular shift = (angle between two consecutive blades / 2) and blades joined to their tops. As @Mab said, that is where 3D printing becomes handy…
One thing is sure, the curved shape of the blades provides mutual strength…
Did you do a STL? Can I play around with it?
Not yet, been busy with the conventional one. I will share the stl as soon as I design it no worries.
Ok, thank you for contributing.
Cool, our first duct which can be found on grabcad and insteuctables have twisted stator upstream of the prop, if anyone want to try, it was a pain to draw:p We also made one with twisted stator downstream of the prop, as this shold be more efficient than upstream stators according to a fluid dynamics guy.
katana|241x500 on the rear of the prop, which accord
It works, but dont know if the efficiency is any better. There was no big different having the twisted stators on the rear of the prop compared to the front, considering that we had stators in Front and in the rear in this setting. It gives additional safety.
We changed to regular thinner airfoils later, and removed the rear twisted stators as it was a pain to disassemble after being soaked in salt water.
Niko
@Hiorth
Ive been riding your original design for over a year now. It works great. I can’t thank you guys enough.
I have been thinking about changing the duct for your straight stator design. Did you notice any difference in performance with the straight thinner airfoils.
Awesome, we are happy that you enjoy it:)
We changed to a thinner straight airfoil on the struts/stator and we also changed the airfoil on the duct itself to a thinner naca profile. It’s better at higher speeds. At low speed the initial design seems to give more thrust for same amout of watts:)
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