Brian Riskas
  • Male
  • San Luis Obispo, CA
  • United States
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Latest Activity

Brian Riskas replied to Robbie Barnes's discussion Drone Lifting
"Christian- Yes, still using off the shelf lipos. Due to the large props and lightweight structure, we only load the batteries at ~1.5C, which allows us to get a little more out of the standard lipo packs. We have been looking into an 18650 based…"
Aug 2
Brian Riskas replied to Robbie Barnes's discussion Drone Lifting
"Hello- I have built a few of these types of craft here in the USA for aerial spraying. We manufacture a custom frame with removable arms, KDE 7215 motors and ESCs, Pixhawk and 30" props in an X8 configuration. I am not sure what is required for…"
Aug 2
Brian Riskas replied to Richard Morrissey's discussion Building a Drone for ecology work.
"Richard- You should try to figure out what sensor loadout you need and then try to build a vehicle around that. Fixed wings can and do work well in wind, as David says above. Rotary wing craft are very nice because as you know, they can take off and…"
Jul 24
Brian Riskas replied to Richard Morrissey's discussion Building a Drone for ecology work.
"I tend to agree with OG, you are better off buying a ready made system. We built a large X8 a few years ago for agricultural spraying because we couldn't find anything on the market that would suit our needs. We ended up with a pretty nice unit…"
Jul 20
Brian Riskas replied to Erick Gibbs's discussion PRESSURE WASHING TETHERED UAV
"Erick- I built a large X8 multicopter and sprayer system last year that was used for spraying in agricultural settings. The platform might be useful for your application. I sent you a message with a link to the build. Thanks -Brain"
Jun 16
Brian Riskas replied to Bill Elias's discussion UAV sprayer for agriculture
"Ben- My sprayer system has no pump, instead my system uses a pressurized gas cylinder with a solenoid valve. I have a custom driver circuit that opens the solenoid valve when triggered by a voltage. In my case, I use channel 7 optional set to…"
May 31
Brian Riskas replied to Bill Elias's discussion UAV sprayer for agriculture
"Paul- I am glad you liked the post about building the X8! There is nothing wrong with a submerged sump pump setup, I looked at that option when I was building the tank. The customer liked the idea of a pressure vessel with less moving parts, and it…"
Apr 9
Brian Riskas replied to Bill Elias's discussion UAV sprayer for agriculture
"Paul- Thanks for the compliments, we are really happy with how this vehicle has been performing.To answer your questions: Depending on the application, there are a few ways we can tell if the tank is empty. The pressure tank carries an external gas…"
Apr 5
Brian Riskas replied to Bill Elias's discussion UAV sprayer for agriculture
"Bill- I do not know where you are located, but in the USA you will most likely be limited to a 55lb all up weight if you want to operate under part 107. That being said, for a 140lb payload you are realistically looking at something the size of a…"
Mar 21
Brian Riskas left a comment for Brian Riskas
"Gary- Thank you very much! Have a great weekend. -Brian"
Sep 23, 2016
Gary McCray left a comment for Brian Riskas
"Hi Brian, Please feel free to use any comments you find useful, no attribution necessary. Best Regards, Gary McCray"
Sep 23, 2016
Brian Riskas commented on Brian Riskas's blog post Heavy lift X8 and sprayer system
"Just wanted to post some short videos in case anyone was interested. The first is a short clip on the vehicle takeoff and hovering https://www.youtube.com/watch?v=Y2yNA7Aza34 And another of the sprayer system in action at a commercial…"
Sep 21, 2016
dhiraj commented on Brian Riskas's blog post Heavy lift X8 and sprayer system
"@Brian awesome build! Overall system looks very professional, especially the work done on spraying mechanism."
Aug 27, 2016
Digital Wings commented on Brian Riskas's blog post Heavy lift X8 and sprayer system
"Very nice design"
Aug 24, 2016
Gary McCray commented on Brian Riskas's blog post Heavy lift X8 and sprayer system
"Hi George, Some time ago here at DIY drones, one of the members did some real world tests with square versus round tubing of the same dimension on a standard quadcopter, they found, as I recall, approximately a 4 percent improvement in efficiency…"
Aug 24, 2016
George Kelly commented on Brian Riskas's blog post Heavy lift X8 and sprayer system
"Brian: The ventilated arms are a work-in-progress only :) (Along with a few dozen other things). My current working X8 just uses square aluminum tube booms. Cheap, versatile, easily-modified during 'R&D'. But not as wind-efficient…"
Aug 24, 2016

Profile Information

About Me:
Owner/ designer @ RMD Systems. We develop mobile robotic systems for disaster relief and agriculture.

www.rmd-systems.com
Please tell us a bit about your UAV interest
We manufacture large multirotor airframes for agriculture use and disaster relief. We also design and build specialty payloads such as sprayer systems and imaging systems to compliment our vehicles.
Hometown:
San Luis Obispo

Brian Riskas's Blog

Heavy lift X8 and sprayer system

Posted on August 23, 2016 at 7:03pm 16 Comments

Hello everyone, I have received some questions in another thread regarding my large X8 build and I wanted to take a minute and share a project that my company has been working on for the last 18 months. We have put together a heavy lift X8 multicopter as well as a sprayer system for…
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Comment Wall (2 comments)

At 8:02pm on September 23, 2016, Gary McCray said…

Hi Brian,

Please feel free to use any comments you find useful, no attribution necessary.

Best Regards,

Gary McCray

At 8:03pm on September 23, 2016, Brian Riskas said…

Gary-

Thank you very much! Have a great weekend.

-Brian

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