Just thought I’d update here with the JavaProp shroud settings after speaking with Martin. Most importantly, it’s important to remember that the “shrouded rotor” option is still experimental and probably not very accurate because one would need a 3D shape and more details for an accurate model. So it can only give a “feeling” for the main effects. Among other factors.
But here’s what he wrote about the settings since they’re not in the manual:
The shroud is input as a dimensionless chord length ratio c_shroud_profile / propeller_radius. The angle is given in degrees and defines the inclination of the shroud profile like on a wing section. A positive angle opens the shroud at the front and closes it towards the rear, as one would use for a propulsor. A negative angle is useful for modeling a shrouded wind-turbine where the shroud opens towards the rear. The shroud profile is assumed to be aerodynamically symmetric usually one would use a negatively cambered airfoil (like an inverted Clark-Y like section) which can be taken into account by adjusting the shroud angle according to the zero lift angle of the asymmetrical section.
I’m not quite fully getting the chord length value, but I’ll play around with it to see if I can give myself a mental picture of what’s going on.
Anyhow…hope this helps and maybe someone else has played around with this here.
Hello FR, can you sell your folding prop to the european members of this forum? instead of going to Lift: prop goes from your factory to USA back to europe… not really the best solution to reduce CO2 emission. And I don’t even talk about taxes and transport cost. thanks a lot for your answer
I would like to take this opportunity to ask you for your opinion on carbon lamination of a 3D printed helix in PETG OR ASA-X? Is this good or does it make the helix too rigid? Have you already done any tests?
Does he want to laminate better in carbon or fiberglass?
Hi there I’m about to do a prop design with onshape, wondering if you could share yours? I’ve done a bunch of basic stuff in it, but never surface modeling, so a bit stumped in terms of how to best make each prop have an aerofoil shape in profile. Thanks!
Ordered one of those cleaver props from prop-shop (CRC/11013/3/LH/BR), thanks for the tip.
I only have 3d printed ones now so this’ll be my first real prop. Will hopefully arrive next week. will try it out and let you know if it’s any good for my setup.
What motor you running? They designed to run between 7500-10000rpm. I know that bazaki on endless sphere managed to get 55kph on a surfboard with one so on an efoil it could be very interesting!
I’ve been too busy with other work over the last 4 months, but got some good stuff coming soon I hope.
I get that the duct around the prop can help protect from weeds, Does it do anything to help with performance? I’m not concerned with weeds in the water I will be in… @SoEFoil@Antonbit and I’m open to others input.
Well it was my first time riding yesterday and fell over the board instead of with the board but if I wouldn’t have fallen in front of the mast I could have gone head first into the propeller had the duct not been there
