About

Gender

Male


About Me:

Full-size glider and airplane pilot, embedded software developer, researcher at Stanford, interested in RC models and micro UAVs.


Please tell us a bit about your UAV interest

www.ranlog.com/ramsey


Hometown:

Oakland, CA


Activity Feed

Marc Ramsey commented on sander's blog post The problem with airspeed sensors
"The Lion Air and Ethiopian flights both had malfunctioning angle of attack sensors (like the vane on the side of the pod pictured above), not airspeed sensors.  Air France 447 would be an example of a crash triggered by a malfunctioning airspeed ind…"
Apr 2, 2019
Marc Ramsey commented on Andrew Rabbitt's blog post Climb-Glide: Improving the range of fixed-wing, electric UAVs
"Oddly enough, full-size self-launching and sustainer-engined sailplanes (retracting engine) use fixed climb pitch propellors, so climb-glide is used to optimize range.  Touring motorgliders (fixed engine) usually have variable pitch propellors (or f…"
Sep 18, 2016
Marc Ramsey commented on Steve Crowe's blog post Watch First FAA-Approved Home Drone Delivery Drop off Slurpees
"One problem I see is that lowering a package to the ground without landing does not meet the wording of FAR 91.119 ("Except when necessary for takeoff and landing"...), so unless the delivery to a point in "other than congested areas" and at least 5…"
Jul 22, 2016
Marc Ramsey commented on Steve Crowe's blog post Watch First FAA-Approved Home Drone Delivery Drop off Slurpees
"I'd love to know how Flirtey is getting around the VLOS, congested area, and operation with 500 feet of persons/structures regulations.  All of the articles seem to gloss this over."
Jul 22, 2016
Marc Ramsey commented on Chris Anderson's blog post ADS-B now supported in beta 3.4 APM software for copter and planes
"uAvionix has some interesting products, but there is one significant error throughout their web site:
ADS-B (Automatic Dependent Surveillance – Broadcast) helps aircraft operators sense and avoid possible collisions. ADS-B is mandated by the FAA for…"
Jul 3, 2016
Marc Ramsey commented on Laser Developer's blog post Obstacle detection LRF takes 36000 readings per second and costs only US$350
"With LIDAR already in use on airplanes, it is hard to see a justification for simply banning them on UAVs that will stand for long, especially when they are going to turn out to be a central cornerstone of our navigation systems.

That's an interest…"
Mar 6, 2015
Marc Ramsey commented on Chris Anderson's blog post Turbine-powered quad first flight
"According to his website that's a turbojet in the center, not a turboshaft driving a genset.  The (battery powered?) propellors are for attitude control only.  This is a subscale prototype, the real thing is supposed carry a pilot, use six turbojets…"
Nov 18, 2014
Marc Ramsey commented on Quadzimodo's blog post Need to Know - Export Controls
"How is it possible that the Australian government has the exact same export language as the US Dept of Commerce (EAR), all the way down to the classification number, 9A012??
See The Wassenaar Arrangement."
Sep 2, 2014
Marc Ramsey commented on Thomas J Coyle III's blog post Bend boy’s drone among those cited as ‘emerging hazard’ for forest firefighters
"The authorities are aware of his actions, and have chosen not to do anything, meaning that boy did not violate airspace, etc.
It's not clear that he didn't violate airspace, they just chose to do nothing but warn him, as I would expect under the cir…"
Aug 26, 2014
Marc Ramsey commented on Thomas J Coyle III's blog post Bend boy’s drone among those cited as ‘emerging hazard’ for forest firefighters
"Ben, I'm sorry, your comment is misguided and wrong.  The kid is not under arrest, he is not being taken to court, there is no indication that there will be any direct direct consequences for his flights.  This was simply an attempt to educate and w…"
Aug 26, 2014
Marc Ramsey commented on Thomas J Coyle III's blog post Bend boy’s drone among those cited as ‘emerging hazard’ for forest firefighters
"I'm missing something here.  How does the newspaper reporter know that "they didn’t get into restricted air space"?  If there are aircraft already present at a forest fire, it is pretty safe to assume that they have established a TFR with a radius o…"
Aug 26, 2014
Marc Ramsey commented on Toby Mills's blog post Sense and Avoid Explained
"While ADS-B will be mandated in the US for many aircraft in 2020, this does not mean all aircraft in US airspace will be equipped.  It will only required for aircraft certified with electrical systems flying in Class A, B, C airspace and Class E air…"
Aug 11, 2014
Marc Ramsey commented on Toby Mills's blog post Sense and Avoid Explained
"An entertaining video with an amusing presenter who gets a few things wrong (transponders don't use GPS, unless they are ADS-B out enabled).  After 30 minutes, he finally gets around to his solution, which involves a secret sauce he won't reveal.  A…"
Aug 10, 2014
Marc Ramsey replied to Dimitris's discussion Vertical speed sensor? (variometer?)
"Jeff, did you notice this thread is nearly 6 years old?  

By "specialized" I meant specific to the implementation of a variometer.  In our case, using the microcontroller onboard ADCs and digital filters, combined with simple linear boxcar filterin…"
Jul 29, 2014
Marc Ramsey commented on John Wiseman's blog post Augmented reality display of air traffic for amateur drones
"Keep in mind that Part 103 ultralights are prohibited from commercial use in the US, with the sole exception of flight instruction.  With the airspace restrictions, ultralights can't ever be anything more than a hobby.  The intent is to give UAVs ac…"
Jun 1, 2013
Marc Ramsey commented on John Wiseman's blog post Augmented reality display of air traffic for amateur drones
"HeliStorm, my only point is that, unfortunately, ADS-B can't be a 100% solution to being being able to sense & avoid aircraft here in the US, as not all aircraft are, or will be, equipped with ADS-B transmitters.  That includes ultralight vehicles,…"
Jun 1, 2013
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