Check Here
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52mm on mine for the front
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I recall you saying it was 150mm diameter. Is that still correct?
Yes,
Fly FAST 
♂ …
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Drew up a duct and hub for those who buy this FR prop. this is for the Reachertech 65161.
Not sure how to upload STLs so just PM and Ill send the STL.
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This ring, could be designed as “pre swirls stator” Can add efficency to our drives.
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Great info ! bookmarked 
Nice catch ! 18 months before the above video about how to save energy with a controllable pitch propellers (CPP), they released this one about 5 different ways to save energy with fixed pitch propellers (FPP)… our current need …
See also:
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Looks great!! You can upload to autodesk cloud or share in google drive
changed location of post…
nice… fly high and save…
And now only need without safety gourd only mittle cone for racing 
ha, yep did that one too. 
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Yea… Lets RACE begin
Does it make a big difference when the prop guard is taken off ?
Let’s say like + 5km/h with the same amp ?
Im not looking so on amps side i looking on speed and more loss fealing
This is pretty much my sentiment. Less focus on data and more focus on FUN 
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cheers on that… 
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My build with a geared drive went from 34 kph with a duct, to 41 kph without.
Everything else was exactly the same.
amazing video! Do you find the axis 82 foil pretty good in surf? It seems like a really big wing. But maybe that’s why you’re so efficient? This is exactly what I’ve been trying to do but I’m so caught up in building it hasn’t happened. I think I’m going to go for it and get a FR motor system with board. Problems solved! ha
So you’re only running 6S with this set up? That’s pretty cool and saves weight.