# 50 MINUTE flight with my cargo drone video (with only a 3s 5200 mah) AND WITHOUT THE CARGO BOX

Hi guys, there is my video test showing my first flight time test with my cargo drone, I get 50 minutes with a 3s 5.2 Ah, if you want to stay tuned about the project sign up the newsletter http://eepurl.com/cUJnJr  or just take a look to my site https://www.sandwichdrones.it/

I had some problems to upload the video without the speed 10X cause it was about 7 Gb, if you want to send me a pm and I will try to send it to you.

ps. a future prototype will be a hybrid so stay tuned!

Views: 3090

Comment by FilioRocks on August 11, 2017 at 7:10pm
Nice work!

Moderator
Comment by Graham Dyer on August 12, 2017 at 7:45am

Care to share weight and the types of motors, esc's, battery?

Comment by Nicolai Valenti on August 13, 2017 at 6:36am

Graham Dyer the esc is a qbrain 20 amp X 4 battery as I already wrote are 2000 + 3200 mah in parallel, simple Lion battery from hobbyking, the motors are from the sunnysky factory (I will not specify the model but you can simply get it searching in google (it's probably their most efficient motor) the weight is 1500 g with battery

Comment by Nicolai Valenti on August 13, 2017 at 6:37am

Filio Rocks thank you!

Comment by Quadzimodo on August 13, 2017 at 8:37pm
Who's gonna call it?
Comment by Greg Fletcher on August 13, 2017 at 9:11pm

Ok I will.  From your data. 50/60 = 0.833 hrs. If all 5.2 Ah are used, that's 5.2 Ah/0.833 h = 6.24 amps. At an average battery voltage for the life of the charge that's 11.1V * 6.24A = 69.26 watts. Your aircraft weighs 1500 g. So you efficiency is 1500g/69.26w = 21.65 watts/gram. A T-motor U8 Lite 85 kv with a 29" prop at its peak efficiency(40% power) is 16.96 grams/watt. That was maybe the most efficient motor on earth..

http://store-en.tmotor.com/goods.php?id=462

So what Sunnysky motor and prop combo are you using? They will put T-motor out of business.

Comment by Nicolai Valenti on August 14, 2017 at 3:27am

Greg Fletcher here is the prop test of the motor I'm using (without modifying anything such as

`lighten the rotor block and change the permanent magnets, as I did) the original motor is the 580 kv Sunnysky, as you can see your motor isn't the most efficient,`
` this can arrive to 20 g per watt without modifing anything`
`ps. my model weight is about 1500g when there is the cargo box, i during the flight there wasn't any cargo box so the weight was 1200g`
Comment by Nicolai Valenti on August 14, 2017 at 3:32am

here is a bigger part of the sheet

if you need to see the full sheet you can click here https://www.banggood.com/Sunnysky-V3508-580KV-Outrunner-Brushless-M...

Moderator
Comment by Graham Dyer on August 14, 2017 at 3:45am

That sheet states 23W at 65% with 13x4 prop for 370g thrust each motor, that's 92W for 4 motors for 1480g thrust.

92W / 11.1V = 8.28A which only gives 37mins using 5200mAh or 30 mins using 4160mAh (realistically 80% of 5200mAh).

That you managed 50 mins is just amazing.

Comment by Nicolai Valenti on August 14, 2017 at 3:53am

you made this calculation by adding 280g at my flight and reducing the battery at 4.1 mah from 5.2 and not considering any modifications, but okay

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