Propellers and Ducts


#145

How are you all getting Javaprop to work? Java won’t let me install it because it’s not from a trusted site. I’ve tried downgrading Java, that didn’t work.


#146

If you google on javaprop site, there’s an how to. For windows computer, control panel- java and you need to add an exception for that website


#147

Yes that is what we did, Javaprop website shows how to do it also, took me a couple tries to figure it out but I did get it.
Maybe you can run WEB VERSION? does this work for you? http://www.mh-aerotools.de/airfoils/java/ws/javaprop.jnlp


#148

I think the web version won’t let you save your design…
I got the desktop version to work on my company laptop which is very tight from a security point of view.
I re-installed Java a couple times and it magically started to work… not sure why.


#149

Ah!ah! I did the same on my office computer! On Windows 7 it was just matter of setting a “domain exception” from control panel, start menu.
Javaprop web won’t let you export.
One though is due at this stage: I’m close to seatrial, wish it work fine, but even if no, the journey it’s been fantastic a so stimulating! I’d to learn and dig back into my electronic degree, beyond any of my nautical professional skill, the Efoil bug pulled out all the best and force me back to study. …and it’s not over yet!!!


#150

I got Javaprop to work, but it doesn’t do anything. Hit “Design-it!” after entering my variables, nothing happens. Has this happened to anyone?


#152

I’ve gone through all tabs. Nothing.


#154

you are absolutely correct because when you shut off the air intake on a jacuzzi, the power of the thrust goes way down compared to when it pulls air in with the water jet


#155

Do you think this could be worth some experimentation?

http://frpc.net.technion.ac.il/marine-two-phase-jet-propulsion-and-bubbly-flows/


#156

Totally! Thanks for sharing this info. We have been discussing this idea here.


#157

Very interesting. What if we can try air EDF pushing air (acting as an air compressor) into the such propulsion system installed near the wings area. What do you think?


#158

In case there is still any question about the pitch of the propeller, it has been measured to be pitch 6


#159

Would be cool if Pacificmeisters prop model would paremetricly imprint the pitch and so on on the hub.


#160

Haha yeah that would make it official


#161

Hi VEFoil

This looks like the duct/prop you are holding in the picture.
https://www.aliexpress.com/item/Duct-Propeller-Assembly-Diameter-80mm-ADP8012-4-L-R-D-4-Blades-used-in-RC-boats/32272783458.html?spm=2114.search0104.3.64.6e7819efmDNAgY&ws_ab_test=searchweb0_0,searchweb201602_5_10152_10151_10065_10344_10068_10130_5722815_10324_10342_10547_10325_10343_10546_10340_5722915_10548_10341_10545_5722615_10696_10084_10083_10618_10307_5722715_10059_100031_10103_10624_10623_10622_5722515_10621_10620,searchweb201603_25,ppcSwitch_4&algo_expid=1217deef-2ca9-447c-9639-6161c5aa4ab8-9&algo_pvid=1217deef-2ca9-447c-9639-6161c5aa4ab8&transAbTest=ae803_2&priceBeautifyAB=0

It has all the power/thrust/rpm charts listed. By the sound of it you are using the 80mm setup…or its similar to what you describe. I have been wondering about this set up. It would make some people’s build much easier. If you’re running at 8700RPM then I would think a direct drive outrunner 175-200KV motor would work well at 12S. The duct and prop are metal which would be much better than the printed ones. I think you could make it more efficient but
anyway, just a thought. I may buy one to see how it works. Its a decent price
Mike


#162

Hi MikeL,
Yes we used several of those, 120mm, 80mm, 60mm. The to give thrust but nothing close to what they state they should. tested them with reduction gear and direct drive, yes they give thrust and you could most likely get one working but we opted to get away totally from reduction gear and and ducted prop.They do have their limitations and the larger ones cost a lot plus shipping. I have a box of them sitting beside me now for future use hopefully to make some other toy eventually.


#163

Hi

if anyone needs it: HIGH QUALITY ALUMINIUM + HARD ANODISING PROP?

FOR 10mm SHAFT and 3 mm pin.

PERFECT FOR 3000 - 3500 rpm ( 3 blade)
PERFECT FOR 2500 - 3000 rpm ( 4 blade)


#164

Those look great. Whats the cost?


#165

160€ - 3 BLADES
190€ - 4 BLADES

for efoil builders comunity - 10% discaunt :slight_smile:


#166

Do you have any idea when will the motor unit be on sale?