Nicolai Valenti's blog - RC Groups
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Posted by Nicolai Valenti | Oct 14, 2017 @ 04:56 AM | 1,994 Views
Let's start with the generator on the prototype

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This is the prototype, the generator is only for demonstration purpose because the generator at the moment is made from a nitro engine with all the connected problems (vibration and fuel consumption). A good thing is that I can add 4 kg of payload and still fly with this configuration, but without the main part of the generator (the gas engine) this is only an oversized piece of carbon fiber and wood so I made a project with a Turnigy 26 cc gas engine (3 hp) and a sensored brushless for the starting and converting the kinetic energy to a three-phase current that will be rectified with a diode bridge. Here is the project

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this weekend I will make some flight tests with the prototype and some videos.

The final new is that I'm going on Kickstarter. Why I'm doing this? simple, I have to pay for the flight school and I really don't know how to get the money for the generator (I also need a px4 system with gps and telemetry). I'm working on a heavy lift cargo drone, that means I need a total thrust that is more than 8 kg (my current total thrust). I will take four SUNNYSKY XS4112S 340KV outrunner brushless motors. All this stuff will cost about 500 dollars so I think I will put this request on the Kickstarter page. If you want to stay informed please sign up the mail list http://eepurl.com/cUJnJr ;

Here is the site (under developing) www.sandwichdrones.it
Posted by Nicolai Valenti | Oct 01, 2017 @ 08:38 AM | 1,042 Views
In this month I've worked on my generator, it is composed of a brushless motor, a glow one and a diode bridge rectifier, as you can see in picture

It was able to generate at max throttle about 1.2 kW , starting the motor is difficult, I don't love glow engines (I only figured it now ahah) but the point is that my generator works and with some modifications to reduces vibrations can be mounted on a drone.
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What I want to do now is to use a gas motor to generate the energy because glow engines consume a lot more fuel (I will be able to generate 1 kW/h with 0.30 L ).

I have also made a new frame to sustain a bigger cargo system (and the generator)
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I don't have enough money to buy the gas engine and also upgrade my old APM system to a new pixhawk one so I'm selling my laptop (I'm a student, and have also to pay the flight school)

But I'm trying, the numbers are good 1kW is enough to sustain my configuration with 2KG of cargo weight.

If you want to stay in contact please subscribe to newsletter http://eepurl.com/cUJnJr and take a look at the site https://www.sandwichdrones.it/
Posted by Nicolai Valenti | Aug 11, 2017 @ 07:17 PM | 1,157 Views
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/

here is the video



50 minute flight time with 3s 5.2 Ah (5 min 14 sec)








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!
Posted by Nicolai Valenti | Jul 28, 2017 @ 08:36 PM | 1,448 Views
Today I've made a new test of 3KG payload drone, I'm working on a cargo drone since 2015 so this is a great result for me, I'm also working on autonomous flight system for my drone there is the newsletter of the project : http://eepurl.com/cUJnJr
and here is the site: https://www.sandwichdrones.it/

THE TEST:
3KG cargo drone test (1 min 12 sec)


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Posted by Nicolai Valenti | Jul 17, 2017 @ 04:00 PM | 2,203 Views
In these days, while waiting for the waypoint navigation hardware, I'm working on the new frame for my cargo drone, and on the new box, I'm also planning for 4KG PAYLOAD test, after the first of 2kg, I've now got 580kv motors so I have better a thrust, if you want to stay informed on this project please subscribe to the newsletter: http://eepurl.com/cUJnJr or take a look at my site: https://www.sandwichdrones.it/
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Posted by Nicolai Valenti | Jul 09, 2017 @ 07:27 AM | 11,170 Views
Hi guys, in these days I made a successful payload test of my cargo drone (it's just a few seconds but it demonstrates that we can do it). Another news is that I'm working on the cargo box so I changed it with a more resistant one and now I'm working on the navigation system (based on waypoints). ( sign up to stay informed on this project http://eepurl.com/cUJnJr or visit our site https://www.sandwichdrones.it/)
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cargo test preparation
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Posted by Nicolai Valenti | Jul 07, 2017 @ 08:10 PM | 13,264 Views
Hi guys, it's 2:05 am in Italy and I'm still searching for a multiwii combo like this https://hobbyking.com/en_us/multiwii...ps-module.html it was a really good offer and I need it for my cargo drone project https://www.sandwichdrones.it/ but there isn't anything similar in amazon.it and in other stores, anyone have a suggestion ?
Posted by Nicolai Valenti | Jul 06, 2017 @ 04:52 AM | 1,632 Views
This is my little cargo drone, it can lift about 2000g and the maximum flight time is about 50 minutes, I also have a site so if you want just click the link, take a look and subscribe to the newsletter https://www.sandwichdrones.it/