You can also purchase this prop made by an American manufacturer for $64. I like the nice glossy black powder coated finish on this prop from Michigan Wheel.
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I’m gonna take a stab and say it’s either the prop or your foil. On a very outside note, check to see if your motor pod is slightly loose on you mast…
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https://www.amazon.com/Amarine-made-Engine-Aluminum-Propeller-Outboard/dp/B07FF4YNB4/ref=mp_s_a_1_7?dchild=1&keywords=4hp+yamaha+propeller&qid=1581612186&sr=8-7
…a link for US builders who want to try this prop without waiting for it to come from China.
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Can you send me the link of the prop and how did you mount it on?
Thanks
And could I have the mast clamp files please 
I have a Gong foil and 65161 120KV motor. I was wondering if you would share your mast clamp?
Dang. Wish I saw this before waiting 3 weeks to get this prop from china! Now we just need to find an amazon seller for the flipsky VESC. Ive been waiting like a month for mine to show up. Anyone else sketched out about getting a Chinese part in with CoronaVirus?
Just drilled the hub out slightly larger so it would fit on the motor shaft. Then I cut a groove in the front side of the hub for the motor pin to fit in. Cut it just deep enough to sink the entire diameter of the pin in. I tried using an endmill in my drill press which was a fail so I just switched over to a dremel like @Louis. Take your time though. If there’s too much slop, the pin could slam around in there and wollow (is that a word?) out your groove and it will slowly destroy itself. If I were to do it again I would also only drill out the hole just enough so that the shoulder of the motor shaft sits on the shoulder of the drilled hole in the prop hub and keeps the axial load off of the pin.
Here are my files. Cant guarantee that they will fit your mast though. The rear fairing between motor and prop should work for you. (remember to only cut the pin groove just deep enough to fit the entire pin).
Prop Fairing: Fusion
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Thanks perfect answer
I think getting Corona virus from packages is not possible. The virus should die right?
I’ve been taught today it tan survive up to 10 days in the package…
I’am not opening anything before 10 days when receiving it from CN anymore…
But it seems there are many different opinion on the question
um ok i odered a lot of drones and opened them immedialty. this was 2 weeks ago im still not sick
I did the same. Ordered 4 Emax motors for drone and opened them 2 weeks ago. Won’t take the risk again…
It seems like Most efoilers are also droning! Good flight Gentlemen.
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Thanks, I like the design of the mast clamp but your mast profile is different than my Gong Mast. Is your mast shape that way, because your running the wires on the outside of the mast?
I think we are screwed either way. 68000 people have the virus. How can that ever be stopped? My only hope is that the summer temperatures kill it, or we find a cure, or that Europeans might be genetically more immune. It seems so contagious! 14 days of illness plus It can spread 14 days before and after you felt symptoms. A bad combination if that is true.
@MaxMaker i just read an article about cronavirus surving on packages. The time it survives on ideal conditions is about 1-2h. so if ever a delivery from China comes this fast get yourself some gloves 
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Oh come on. 70000 out of 1400000000. that is something like 0,00004%. Like a flu in Europe
Imho we have more Luck to Hit our 's prop before contract THE virus who Can stop for a more moment the china export😁
If you really are that worried just use a steriwipe on the box… There are way more people infected than they actually know about! So many young healthy people won’t even bother to go get tested and as a result won’t become statistics.