Thruster for kayak, which one to choose?

Boats, Jet Skis, Kayaks etc., including hovercrafts
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nanni   10 mW

10 mW
Posts: 23
Joined: Aug 28 2014 1:25pm

Thruster for kayak, which one to choose?

Post by nanni » Nov 17 2019 3:46am

Hello everyone, I found on aliexpress two thruster models 200mm 36-48v that maybe could fit on a kayak. I would like to try one on my 17' kayak. Which do you think would be better? the design of the blade is different.
https://it.aliexpress.com/item/40000525 ... b201603_55
https://it.aliexpress.com/item/40002004 ... b201603_55
I can't translate Chinese written in images.
Videos:
two motors on 44v https://pingjia.alicdn.com/l4QhS6EccpZU ... p4__hd.mp4
maybe one motor at low speed https://pingjia.alicdn.com/ivEVw0JlvA1U ... p4__ld.mp4
This is a new system for kayak https://www.thrustme.no/ and it push 16 kg in forward on 18,5v but for me it is very expensive, this is the prop https://www.thrustme.no/product/propeller-cw/

Hillhater   100 GW

100 GW
Posts: 11050
Joined: Aug 03 2010 10:33pm
Location: Sydney ..(Hilly part !) .. Australia/ Down under !

Re: Thruster for kayak, which one to choose?

Post by Hillhater » Dec 16 2019 10:07pm

Those all seem to be either 3D printed jokes, or computer renderings.
They all seem to have a absolute terrible prop designes for speed and efficiency.
You didnt say what you want from this thruster, speed, range, cost limits , etc.
This forum owes its existence to Justin of ebikes.ca

nanni   10 mW

10 mW
Posts: 23
Joined: Aug 28 2014 1:25pm

Re: Thruster for kayak, which one to choose?

Post by nanni » Dec 17 2019 5:01pm

Thank you for your answer Hillhater. I want range, I think that a large propeller (brushless thruster) at low revs 1000/1500 consumes less battery compared to a dc trolling motor. What do you think about it?

Hillhater   100 GW

100 GW
Posts: 11050
Joined: Aug 03 2010 10:33pm
Location: Sydney ..(Hilly part !) .. Australia/ Down under !

Re: Thruster for kayak, which one to choose?

Post by Hillhater » Dec 17 2019 8:49pm

Yes, certainly prop design is critical, and part of that dictates the rpm .
There have been several threads on this forum , generally i recall a large dia , thin section, slow turning , prop ( much like an aircraft prop ), is ideal at low rpm.
But they are very susseptable to fouling by weeds and debris etc, so often a compromise “swept back” prop design is used.
For low motor rpm and to avoid gearing , a very low KV motor , low voltage, and an efficient electronic speed controller is necessary.
I doubt you will find such a set up available commercially though.?
Read this thread to give you a few ideas.. viewtopic.php?f=39&t=40921
This forum owes its existence to Justin of ebikes.ca

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