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Of course this topic is hot, and for sure you are not the only one (the only group) that are on it right now. Just some basic math payload 80kg, therefore a proper setup is about 1:1:1 so 80kg payload, 80kg batteries, 80kg copter, now since we all are super skilled (and for simplicity) we...

If you have a look in this video: https://vimeo.com/87954117 at 0:57 this is what it was about in that flight. If you fly for almost an hour conditions can chance. In this video at starting it was calm, but as the time passed (and I sit and wait in front of the copter) wind speed raised up...

Voltage is a parameter you have to (you can) adjust for your setup. It depends on your motors/propellers and AUW. Or course you can also see it the other way round and fix the voltage (because you have already packs of a given voltage) then you have to adjust (the KV) of the motors to fit your...

6s: https://vimeo.com/101842668 6s: with payload https://vimeo.com/86122621 6s: without payload https://vimeo.com/85514725 All with WKM or Naza all "tail-heavy" copter .... All the same arguments came 2 years ago when I started to use 14" props, people started with the myth of the "low disk...

Old Man, That you did not succeed does not imply that success is impossible. If you have a look at the wind-mark in this https://vimeo.com/87954117 and that video https://vimeo.com/101842668 I would not call this "dead calm" conditions. If only I would get a 1$ for every "this is...

on 14" copter you can choose flat or X8, but with 28" props? If you wanna use a car (and not a truck) to transport the copter, then a X8 is the only choice. flat would require 2m m2m-distance. I am using the same props on top and bottom, and most of people who tell you something different have...

@khaled_abokakr 10kg payload for 7min is not bad. Did you measure the motor temps after flight? I still think that with lover voltage you could get some extra minutes. From my point of view a proper setup for 10kg payload would need 10kg battery too. @R_Lefebvre If you set a voltage alarm that...

Is there a "power" version on the road-map, since I am not member of the <80kg class ... (mostly because of my heavy shoes and cloth :D ). All the best, but you should add one or two 0 on your business plan otherwise possible investors immediately think "kids", "joke", ... but most important...

That is where I have my experience on multirotors from. best regards Ferdinand

Of course it is important to monitor every cell, Jeti has even voltage sensors you can plug in the balancer wire of the pack. But if you "know" your batteries you can also see the first cell dropping, since this is the first rapid (within seconds) voltage drop you can see. best regards Ferdinand

... if your copter layout meets the requirements ... If you can fly with standard packs more that 12-15min, it is of advantage to use that high density (>180Wh/kg) packs, if your copter does not reach 12-15min with standard packs, they will not work (you have to change something else first e.g...

This tells you that they have the same energy density (since they are the same batteries this is no surprise). The engergy density is an attribute of the cell, it is regardless how many of them you switch parallel or serial. Quinton, The spreadsheet just shows you the same (the energy density...

Why not, these are "standard"/"high discharge rate" packs the energy density is what is should be for these (150-160Wh/kg). The "high-capa"/"low discharge rate" have up to 180-200wh/kg, LiIon (1C application) up to 260wh/kg. There is no magic behind. If you compare to this pack...

Discharge end of the pack is not when 80% are reached (this is/was a rule of thumb), it is when the discharge curve is getting steep again. So the less (current) you draw, the more (capacity) you can take out. The manufacturers of the cells (not the hobby-shops) do even publish these...

Possibly what was 5 on mine (ordered before tattu was existing) is now 15 on the sticker on the packs, possibly some guy from sales and marketing thought, that no one would buy a 5C pack, since they are all used to the 30/60 and 60/90 numbers on the stickers so far. I am not sure if it would be...

@Khaled The first thing is to measure more exact data, how long do you fly, and how much do you recharge, based on that information you can continue. With my X8 with u8100KV I fly up to 10kg with 6S, and up to 15kg with 8S. Since your motors have more power, 8S or 10S should be enough...

This is very few data you share, what AUW ... 3,85 is not even close to empty ... With new low C-rate battery you can fly until 3,3-3,4V under load. best regards Ferdinand

X8 pros: smaller lightweight frame shorter wires (less wires) one motor can fail Hex pros: can be flown without landing legs (and save weight therefore) I have done hex and X8 with the same motor/esc/propeller combo: Hex: lateron flown without landing legs X8 you can see in this video with...

... this means 16A at 15V which is about 10gr/W (not 15)

My (flight-) data says, that the coax "effect" is 10%, (but the 10% you would loose again if you think of the weight of a flat-octo frame (2m diameter)). The foxtech prop I do not have right now, but possibly they will come soon. best regards Ferdinand