About

Gender

Male


Location

Belle Plaine, MN


About Me:

Mechanical Engineer. Always interested in flight and the engineering challenges.


Please tell us a bit about your UAV interest

Full scale UAV with aspirations to make it an MAV Quadcopter configuration. 2.4 meter rotor diameter. 36 HP with 175 Kg gross wt. Testing single rotor performance, various blade, hub, drive configurations.


Hometown:

BELLE PLAINE


Activity Feed

Randy Sonnicksen posted a discussion
My new project is to create an RC model of the BlackFly PAV.  There are many technical challenges to solve and my plan is to first build a 2 motor / 2 elevon VTOL flying wing.  (I'm writing my own FC code using the STM32 Blue Pill).  I would like to…
Aug 19, 2019
Randy Sonnicksen commented on Randy Sonnicksen's blog post Changing Direction
"Chris, first time I've been affirmed for being a "quitter", but I'll take it.
Bitter-sweet to let go of this project.  I've got 6 lab notebooks full of sketches, calculations and ideas.
But as I said, I learned so much by DOING and those lessons are…"
Nov 14, 2018
Randy Sonnicksen posted a blog post
Well, the day finally has come when I am ready to give up on this endeavor. My goal was to build a manned, internal combustion quad copter.  I will not say the project was a failure because I learned so much on my journey, but I just see other…
Nov 13, 2018
Randy Sonnicksen commented on Alexandre Mainardi (Nuvem UAV)'s blog post An underactuated propeller for attitude control in micro air vehicles
"This is ingenious!  Very, very cool."
Jun 12, 2018
Randy Sonnicksen posted a blog post
Test VideoI was finally able to perform a test of the new drive test stand.  The previous test stand used a 4-stroke engine and a less rigid test frame.  This test stand consists of a 6.5 HP, 2-stroke DuraForce engine coupled to a V-Belt centrifugal…
Jun 12, 2018
Randy Sonnicksen commented on Josip Nunth's blog post Boeing cargo Drone Prototype. Does this make sense?
"Josip,
Yes, my assumptions were that if you just scaled the model up using same materials.
I think you are right that carbon, especially carbon with a light filler material changes the equation dramatically.
The variable pitch quad I am working on…"
Apr 8, 2018
Randy Sonnicksen commented on Josip Nunth's blog post Boeing cargo Drone Prototype. Does this make sense?
"I wondered the same thing.  Here are my thoughts..
Multicopter Scalability"
Apr 4, 2018
Randy Sonnicksen commented on Randy Sonnicksen's blog post Servo Redundancy
"So I was thinking...
If I use a triple redundant system, it would be feasible to allow one of the 3 controllers to implement integral control.
The potential side effects could be:
This controllers servo's would do more work.  With proper limiting…"
Mar 29, 2018
Randy Sonnicksen commented on Randy Sonnicksen's blog post Servo Redundancy
"Chris, Yes, if the broken servo free-wheels, I'm SOL.  
Regarding pitch control range, I'm planning to only use the middle 2/3 of the servo's range during normal operation so that extra range on the servo is available to compensate for a…"
Mar 21, 2018
Randy Sonnicksen commented on Randy Sonnicksen's blog post Servo Redundancy
"I posted a comment on Axel Borg's (AmazingDIYProjects) youtube video wondering how he handled integral control with 5 independent controllers, and....HE ANSWERED!  Which is very uncharacteristic for him.  He indicated that the flight controllers…"
Mar 16, 2018
Randy Sonnicksen commented on Randy Sonnicksen's blog post Servo Redundancy
"Armin, Yes this is a bit tricky.  I was wrong before thinking that PID on the roll/pitch rate control would avoid divergence between controllers.  This will be a problem if I use integral control. I wonder how the guy in Amazing DIY Projects handled…"
Mar 15, 2018
Randy Sonnicksen commented on Randy Sonnicksen's blog post Servo Redundancy
"Armin,
The algorithm I'm playing with has a roll/pitch angle proportional controller cascaded to a roll/pitch rate PID controller.
If I'm thinking correctly, the separate controllers shouldn't "wind up" their integral term, because the PID loop is…"
Mar 14, 2018
Randy Sonnicksen commented on Randy Sonnicksen's blog post Servo Redundancy
"Armin, I hear what you are saying, and....this project has already gotten more complex than I had originally hoped.
So, my approach at this point is to let the healthy systems compensate for the unhealthy ones.  I acknowledge that during a failure,…"
Mar 14, 2018
Randy Sonnicksen posted a blog post
I continue to develop my "full scale" gas powered, variable pitch quad-copter.After watching the video below at Amazing DIY ProjectsI realized (more vividly) how vulnerable a quad is to any fault in the control system.Then I saw his video here…
Mar 14, 2018
Randy Sonnicksen left a comment for Coptaire
"I'm interested in any result data you have for the shroud.  Considering shrouded rotors on my project but have a few questions:What is the "best" shape for hover performance. I see most VTOL ducted fan shrouds are an airfoil shape, not just a…"
Jan 27, 2018
Randy Sonnicksen commented on Randy Sonnicksen's blog post Multi-Rotor Scalability
"Rusty,
A while back you posted a link regarding reduced yaw control authority on large multi-copter.
I am still working on my large quad-rotor, and my current plan is to run rotors at fixed speed, and vary their pitch.
Based on the paper you linked…"
May 18, 2017
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