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DB posted a discussion
Hi all,I'm looking for some interesting questions to solve as part of my research for school. As operators/builders/enthusiasts of UAVs, particularly multirotors, what questions do you have? Here's a partial list that I've collected so far that I'm…
Feb 11, 2016
DB commented on DB's blog post Submarine Quadrotor
"We can and do! It just takes more current to use the flight propellers underwater.  "
Nov 15, 2015
DB commented on DB's blog post Submarine Quadrotor
"Thanks all!"
Nov 15, 2015
DB replied to Oliver Wetmore's discussion Underwater Quadcopter
"This might be of interest:
https://www.youtube.com/watch?v=U7vl7uqwN4I"
Nov 14, 2015
DB posted a blog post
 Here's a video from one of our recent tests of our GTQ-Cormorant: a submarine and quadrotor hybrid.https://www.youtube.com/watch?v=U7vl7uqwN4IWe use an air pump/solenoid system to move air between the clear, water-tight pressure hull and an…
Nov 14, 2015
DB commented on Ivan Stamatovski's blog post Our new Pixhawk based KickStarter project
"What props are those?  Thanks!"
Sep 30, 2015
DB commented on leonardthall's blog post FPV Racing using Arducopter
"@Scott W, That's weird, I used my tool and it pretty much matches your eCalc numbers:
http://controls.ae.gatech.edu/dbershad/EMSTAirTimeCalculator.html?&......

15 A sounds like a lot for hover for something like this.  Which specific battery do you…"
Aug 20, 2015
DB commented on leonardthall's blog post FPV Racing using Arducopter
"@Scott W, what's your GTOW?  What battery are you using?"
Aug 19, 2015
DB replied to Nader's discussion Flight time of a 3DR robotics X8 model 2013 in ArduCopter User Group
"Why do I keep promoting it?  That's an easy one to answer:
1) so people use it and give me feedback and I can improve the math where it is needed 
2) to provide more tools for us to use to help our community design vehicles and defend the parts…"
Jul 26, 2015
DB replied to Nader's discussion Flight time of a 3DR robotics X8 model 2013 in ArduCopter User Group
"Have you run it through the calculator that I posted above? It gives you optimal speed for max range."
Jul 22, 2015
DB replied to Nader's discussion Flight time of a 3DR robotics X8 model 2013 in ArduCopter User Group
"Do you mean efficient with respect to total range flown per battery?  Or something else? "
Jul 21, 2015
DB replied to Nader's discussion Flight time of a 3DR robotics X8 model 2013 in ArduCopter User Group
"What's your GTOW?  How far do you drain your battery? "
Jul 21, 2015
DB replied to Curious George's discussion Complicated NOOB Questions
"According to the spec, looks like the Attopilot sensor will easily handle what you are going to be drawing.  T-motor has some specs and at 100% throttle you're going to draw around 100 A for 4 rotors.  "
Jul 20, 2015
DB replied to Nader's discussion Flight time of a 3DR robotics X8 model 2013 in ArduCopter User Group
"According to this calculator, one option is increasing the battery size. The calculator says you gain about 2 minutes for every 2000 mAh of capacity added at 3S. However, 4S seems to perform a bit better for this vehicle. Check out the links…"
Jul 20, 2015
DB replied to Justin H.'s discussion Elevation impact on IRIS+ flight times. in IRIS
"Yeah, if you look at it on a per-inch basis, pitch change adds much more drag than diameter change.
Changing diameter makes sense if you're after endurance.  If it's windy though, you want more pitch to be able to handle the wind."
Jul 19, 2015
DB replied to Justin H.'s discussion Elevation impact on IRIS+ flight times. in IRIS
"You can use this calculator to mess around with some of the parameters. It takes into account altitude/density/temperature and you can check the effect on flight times/range/etc of changing prop pitch and a bunch of other…"
Jul 18, 2015
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