Banggood Polaris Lander

Shaun, personally I would take with a pinch of salt 'the little bit of information that came with it' bearing in mind that it comes from China and things are often lost in translation. So it may be fitted with a 1300v motor after all. Secondly assuming that it has a 1000kv motor why the assumption that it has to run on 4s LiPo? The spec. says it has an 8x4in prop. Is that is what has been supplied, which would be very small for the motor on 3s, so perhaps a larger three bladed prop is what is required?

The spec. on the Bangood website says it has a flying weight of 1080g (about 2.3lbs). Using the old rule of thumb of 100W per lb equates to 230W which is easily achievable with your motor I suggest? The question is, is the supplied prop suitable and if you run it with a watt meter you will soon find out. The spec also says that a 40A ESC is supplied so in theory would be good for about 350W approx. if it's possible to fit a big enough 2 or three bladed prop.

What I am really saying is why don't you suck it and see, as what is printed in these instructions is often wrong in my experience. (The website also says the product weight is 6kg! I rest my case)

Edited By Piers Bowlan on 24/11/2020 09:33:39

Polaris plans used to be available on the net, so sure they can be built a lot cheaper than what Banggood want.

Having built 3 at various sizes using Depron, can say they are great fun and an easy plane to start float plane flying as its almost impossible to end up inverted in the water if you mess up the landing.

Keeping the water out is the difficult part when using Depron so on the last build I used nylon applied with Poly C which worked well.

The definitive thread on that model is here... Use the search function and I am sure you will get an answer to the motor Kv question for the Banggood version (EDIT - Info here...). If not you can always use the drill method to determine it for certain.

Edited By MattyB on 24/11/2020 09:41:56

Sounds like you are on the case Shaun.  Good luck.

But a 1kg model with 5kg of packaging!!! I don't think so.

Edited By Piers Bowlan on 24/11/2020 10:04:06

Using a hot wire to cut holes to mount the servos in the wing is fairly easy (if you have cut foam before and have the gear to hand). To run the wires, just cut a slot from servo to fus entry point using a sharp blade and a straight-edge and push the wires in edge on.

Shaun, I think the idea of the wing joiner is that it is only meant to maintain the dihedral and is free floating through the fuselage with the wing roots locking into the fuselage socket to tie things together. I don't think there needs to be a close fitting sleeve through there.

My Skipper XL came with something like a 1000kv motor which I swapped for a 1400kv Turnigy one to use on 3S.

Shaun, what is maximum dia. prop you can fit without it fouling the top of the fuselage. If a 10x6 or (10x8) will fit how many Watts will your motor pull with your 3S battery? Alternatively try a three bladed prop if a 10in prop won't fit - simpler to rectify and cheaper than buying a new motor? Might even work!

I don't think a 10" prop will fit based on these pics; according to the RCGroups thread even a 9" will be a squeeze...

On that basis a motor change to around 1300-1400Kv or move up to 4S are probably the only options - this post is instructive...

Edited By MattyB on 27/11/2020 15:39:42

Edited By MattyB on 27/11/2020 15:42:35

Yes, they told me to send the item back to China, once the supplier acknowledged receipt then I'd get my money back. Good luck!

Banggood actually seem to have a fairly good reputation for customer service, at least compared to many Far East suppliers.