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Author: Dave Nelson

ZMR250 Multirotor Frame

ZMR250 Multirotor Racing Drone
ZMR250 Frame

My first 250 size quadcopter frame was a ZMR250 which I have been told is a clone of a Blackout 250. The Blackout costs $150 from GetFPV while the ZMR is available for as low as $20 from various sources. I got my first one from Banggood in May 2015, it required some drilling to get the 2204 motors to fit the arms and the SMA VTx to fit through the top plate, but I was pretty happy with it overall.

My initial build included:

  • Banggood ZMR250 Carbon Fiber Frame
  • SimonK 20Amp ESCs
  • SunnySky 2204/2300kv Motors (I think they were knock-offs)
  • 700tvl Sony Board Camera
  • ImmersionRC 600mw VTx and Spironet Antennas
  • Naze32 Flight Controller
  • Home-made Power Distribution Board

I chose black and orange as a color scheme using orange shrink-wrap and propellers. After making a lot of mistakes and burning myself with the soldering iron a dozen or more times I decided to name the plane “Orange Pain”.

Since May I have rebuilt the machine a number of times due to burnt out or broken parts. I have gone through a Naze32, two 600mw VTx, a very expensive board camera, a top plate, three motors, three SN20a ESCs, and a ton of props. I bought an FPVModel ZMR250 and built it as a second plane but have since parted it out.

The current iteration of Orange Pain includes:

  • A mixture of Carbon Fiber parts from the original Banggood frame and a FPVModel ZMR250 V2 frame
  • RotorGeek RG20A ESCs
  • SunnySky 2204/2300kv (I think these are real)
  • Fatshark 250mw VTx
  • 600tvl Sony Board Camera PZ4020
  • Naze32 Flight Controller
  • DYS Power Distribution Board

I think this is a great setup for an intermediate racer or daily basher. I am currently struggling to get the tune on it right and am ready to pay someone else to tune it for me.

After rebuilding the machine a number of times I have learned a few things.
The expensive FPV cameras are not worth it, stick with the $30 Sony PZ4020 or PZ4020M with or without a case.
600mw Video Transmitters are not needed and the extra heat can greatly shorten the life of the unit. A 200mw or even 25mw transmitter may last a long longer and provide a signal that is comparable to the higher-powered transmitters at racing and public park distances.
If you short out a flight controller it is probably ruined. It is good to have an extra on hand.
Spend the extra money on 2 sets of drivers, keep one set in a toolbox at home and carry the other set with you.

I really enjoy my ZMR and recommend them for people getting started who want to build their own. The FPVModel ZMR250 V2 is made of a much higher quality carbon fiber than the Banggood frame, but the cheaper frame is not a bad buy.

DroneElectronicsMultirotorRacingRC

ImmersionRC Vortex Pro-Tunes

Vortex 285 – FPV Race Quad
Vortex 285 – FPV Race Quad

The Vortex comes with 10 “Pro-Tunes” that were developed by sponsored pilots before its release. I did a bunch of Googling after buying the Vortex to try and find more details about these varoius tunes and found nothing more than a short video from UmmaGawd about the Vortex.

So here are all the tunes as of October 2015. I hope they add some new ones soon that are specific to newer motor and prop combinations, especially DAL props.

Preset 1

Pilot: AntohonyRC
Props: Gemfan 5040
Motor: T-Motor 1806
Pack: 4S
Camera: Mobius
Style: Easy Rider

Preset 2

Pilot: BewweB
Props: Gemfan 5030
Motor: T-Motor 1806
Pack: 3S
Camera: Mobius
Style: Beginner

Preset 3

Pilot: BewweB
Props: Gemfan 5030
Motor: T-Motor 1806
Pack: 4S
Camera: Mobius
Style: Intermediate

Preset 4

Pilot: BewweB
Props: Gemfan 5040
Motor: T-Motor 1806
Pack: 4S
Camera: Mobius
Style: Race

Preset 5

Pilot: BewweB
Props: HQ 5x4x3
Motor: T-Motor 1806
Pack: 4S
Camera: Mobius
Style: Howler

Preset 6

Pilot: BewweB
Props: Gemfan 5040
Motor: T-Motor 1806
Pack: 4S
Camera: Mobius
Style: Freeride

Preset 7

Pilot: BorisB
Props: HQ 5045
Motor: Cobra CM-2204/32
Pack: 4S
Camera: GoPro
Style: Acrobatic

Preset 8

Pilot: Nocomp
Props: Gemfan 6045
Motor: T-Motor 1806
Pack: 3S
Camera: Mobius
Style: Freerider

Preset 9

Pilot: Porco777
Props: Gemfan 5030
Motor: T-Motor 1806
Pack: 4S
Camera: Mobius
Style: Extreme

Preset 10

Pilot: UmmaGawd
Props: HQ 50540
Motor: T-Motor 1806
Pack: 4S
Camera: GoPro
Style: Precision

In the next couple of weeks I hope to experiment with each of these tunes and see how each performs with the props described and with various DAL props.

DroneElectronicsMultirotorRacingRC

Immersion RC Vortex First Flights

Vortex 285 – FPV Race Quad
Vortex 285 – FPV Race Quad

I have seen a handful of people flying Vortexes around the Atlanta area and after rebuilding my ZMRs like 5 times I decided to give the Immersion Vortex a try.

I bought it from Atlanta Hobby along with both the Carbon Fiber Crash Kit and the Plastic Crash Kit. I also got a cable to allow me to easily connect a Spektrum Satellite receiver without having to make a cable of my own.

I got it home, took it out of the box, connected it to a computer and installed all the updated and such, then was ready to fly. It took me a couple of weeks to have the time and place to fly it, it rained 3 weekends in a row.

Once I finally got to fly the experience was very good. I started out with the Gemfan 5030 props that came with it, Turnigy Nano-tech 3S 1300mah batteries, with a RunCam HD, and used BewweB’s Pro-tune number 2. It flew really well and was a lot of fun. Not what I would call fast or agile, but still fun.

Next up I put a Glacier 4S 1300mah battery on it with DAL 5030 props, it was much faster and a bit more agile. Then I swapped the props out for DAL 5045 Bull-Nose props, but they were too aggressive and drew more amps than I was willing to risk.

Right now I feel like the Vortex’s largest issue is the proprietary 12 amp ESCs. 12 amps is not enough to run 6 inch props on 4S batteries without burning them up very quickly, and right now you cannot get replacement ESCs and without doing something extreme you cannot use larger ESCs.

After 7 flights with a mix of 3S and 4S batteries the ground cable to the FPV camera broke at the connector. I fixed it by cutting up a cable from a RunCam FPV camera and soldering together with the Vortex FPV cable. I also popped the cap off the video transmitter’s antenna, found it and popped it back on, but I plan on gluing it on before my next flight.

Overall I think the Vortex is a decent quad, the trends have changed a lot since its creation and so it has fallen out of favor in comparison to smaller multirotors like the Shendrone’s Tweaker and Krieger, but that does not mean that it is not a good quad. I think it is suitable for fun-flying and even racing at a beginner to intermediate level.

Sorry about the lack of video, the RunCam HD was not at enough of an angle so about all you could see during my flights was the ground. A quick Google search will lead you to many videos of pilots much better than me flying the Vortex.

DroneElectronicsMultirotorRacingRC

Great Planes RealFlight 7.5 Review

RealFlight is an RC flight simulator that you can use to practice flying RC planes, helicopters, and multirotors (drones). It is a lot cheaper to crash in the simulator than in real life.

RealFlight is a good flight-sim, I feel like there are other sims out there that have better physics and are more realistic, but RealFlight feels like the most polished and has many more options than any of the others. But to get the most out of it you will have to turn to the community around it.

There are many versions of RealFlight available and it can be very confusing picking the right one. You can get just the software, with a cable, or with a controller. To make it a bit more confusing there is more than one cable available. I went to my local hobby shop and bought Great Planes RealFlight 7.5 with Wired Interface which is currently $129.98 at Amazon.

If you buy this version you will also need a controller, I use the Spektrum DX6 controller (transmitter) and like it a lot. It is available on Amazon for $199.52 right now, which is a great price.

A great feature of RealFlight is that you can install it on as many computers as you want, but to use it you have to have the Interlink cable with its built in reset button to run it.

RealFlight will not run on MacOS so I primarily use Bootcamp and Windows 8 to play it. But I sometimes use Parallels with Windows 7 or Windows 8, it works but requires a fast Mac to work.

Community

After getting the software installed and you’ve taken a couple of test flights I recommend going over to RCGroups.com and downloading the RCG online field and then the RCG Killer Quad. After installing them and giving them a go you can see if RCG is hosting the field for multiplayer to have some fun with other RC Group members.

If the field does not offer you enough challenges you can open it up in the editor and make it more challenging. I added more gates and removed the stadium seating from mine.

The next place to stop is the Knife Edge Software Swap Pages. These are aircraft and airports created by other players.

Troubleshooting

The only problem I have had with the software is that when I load a new multirotor and try to fly it the plane flops around until it is crashed. This is fixed by flipping the auxillary switches, ‘Y’, ‘U’, ‘I’, and ‘O’, for me it is ‘O’ that usually does the trick.

Improvements

I hope that that next version of RealFlight includes more realistic physics, more realistic graphics, and a simpler interface.

Competition

Phoenix RC is the direct competitor and has its own flaws.
FPV Freerider is a multirotor FPV specific sim with a handful of maps.

Give them all a try, it is a lot cheaper than wrecking and rebuilding your planes.

ComputersDroneMultirotorRC

The Dresden Files by Jim Butcher


I have re-listened to this series a handful of times now and it just gets better every time. I burnt through my credits on Audible faster than usual this year so to delay spending more credits I decided it was about time to listen to all 15 books in the series, I skipped Side Jobs this time.

Harry Dresden is such an amazing character and the world Jim Butcher has created is fantastic. But what makes the series so wonderful are the supporting characters, they are as unforgettable as Dresden.

James Marsters does an AMAZING job narrating these books, you owe it to yourself to listen to the audiobooks even if you have read the books yourself. He adds so much to them!

“PARKOUR”
“Polka will never die!”

I rate the series a 10 out of 10 and recommend everyone give Storm Front a try.

AudioBooks

DragonCon 2015

We had a good time at DragonCon this year. It was a strange year and I felt kind of off the whole show. But I had a good time talking with friends and taking pictures.

The Costume Contest and Masquerade were great, seeing the BSG folks and Karen Gillian was great, and listening the Jim Butcher is always fun. Steranko was a crack-up and the American Horror: Freak Show folks were a blast. The Georgia Philharmonic Orchestra was amazing and Rasputina was delightful.

DragonCon 2015 Photos


American Horror: Freak Show


Costume Contest


Battle Star Galactica


Steranko


Georgia Philharmonic Orchestra


Rasputina


Jim Butcher


Masquerade

PhotographyPictures

Getting into RC Helicopters

Last year I saw a video of a guy flying a remote control helicopter upside down… A HELICOPTER… UPSIDE DOWN!

I watched that video and others like it over and over. So I started saving my money and researching what kind of equipment I needed to learn how to do that myself. I started off with a cheap toy helicopter, then moved to a more expensive one that was much more powerful but still a toy and then finally with a hobby-grade collective pitch heli.

There is such a huge difference between a “Hobby-Grade” and a “Toy” RC vehicle. Mainly it is the ability to fix it and upgrade it, you usually cannot do that with a toy, and hobby-grade usually also means more power.

I bought a Spektrum DX6, not the DX6i, but the new DX6 with the really nice gimbals, voice, and 250 plane memory. It is my first real transmitter so I do not have anything but toys to compare it to, but I really like it.

The helicopter I chose was the Blade Nano CPX, it is a tiny (nano) collective pitch helicopter that is capable of flying upside down. But a funny thing happened. As soon as I had the Nano CPX I started watching videos of guys racing quadcopters through the woods.

Racing through the woods flying quadcopters in first-person view while wearing goggles is so amazing! So immersive! Better than any video game could make it. But there I sat with all this money sunk into a helicopter.

I decided to learn to fly the helicopter until I could successfully fly it upside down, then I would move onto quads.

After crashing a lot and spending a lot of money on replacement parts I broke down and bought the Phoenix RC software because it has the Nano CPX in it. I was really impressed by Phoenix because I crashed the heli in the app in the exact same way that I crashed it in real life. I spent a hundred hours or so practicing in the software and slowly got better with the real thing.

I never got good at flying the helicopter; it was too fast for me to fly it indoors but so light that it was difficult to fly outside. And the cost of repairs was crazy, I spent more on replacement parts in a couple of months than I spent on it new. At that point it just wasn’t fun.

I went to a couple of local events with guys flying large helicopters doing all kind of amazing tricks, their skills are amazing and exciting to watch. But my desire to fly helicopter is totally gone.

I was able to fly it upside down a couple of time successfully and I will probably never fly it again. I will probably sell it and all of the parts I have for it soon. Let me know if you are interested.

Now I am on to flying quadcopters. More about that soon.

Electronics

The Fold by Peter Clines

What the heck is Joe Ledger doing in a Peter Clines novel, haha, I jest.

I really enjoyed 14 by Peter Clines and when I saw his new novel The Fold in Audible I grabbed it and gave it a listen. The audiobook is narrated by Ray Porter who also narrates the Joe Ledger series by Jonathan Maberry so when I hear his voice I hear the voice of Joe Ledger. But this book is not much like the Ledger series.

The lead character, Mike Erikson, is a really smart guy with a photographic memory and Peter Clines does a great job of making him likeable and relatable.

This book didn’t get me too excited, I enjoyed it, but it fell like a compilation of other sci-fi books and movies. There is nothing new here if you have been reading and watching science fiction for awhile. But it is a solid effort, the narration is great, and the characters are fun if a bit predictable.

From the publisher:

Step into the fold. It’s perfectly safe.

The folks in Mike Erikson’s small New England town would say he’s just your average, everyday guy. And that’s exactly how Mike likes it. Sure, the life he’s chosen isn’t much of a challenge to someone with his unique gifts, but he’s content with his quiet and peaceful existence. That is until an old friend presents him with an irresistible mystery, one that Mike is uniquely qualified to solve.

Far out in the California desert, a team of DARPA scientists has invented a device they affectionately call the Albuquerque Door. Using a cryptic computer equation and magnetic fields to "fold" dimensions, it shrinks distances so a traveler can travel hundreds of feet with a single step. The invention promises to make mankind’s dreams of teleportation a reality. And, the scientists insist, traveling through the door is completely safe. Yet evidence is mounting that this miraculous machine isn’t quite what it seems – and that its creators are harboring a dangerous secret.

As his investigations draw him deeper into the puzzle, Mike begins to fear there’s only one answer that makes sense. And if he’s right, it may be only a matter of time before the project destroys…everything. A cunningly inventive mystery featuring a hero worthy of Sherlock Holmes and a terrifying final twist you’ll never see coming, The Fold is that rarest of things: a genuine pause-resister science-fiction thriller. Step inside its audio and learn why author Peter Clines has already won legions of loyal fans.

©2015 Peter Clines (P)2015 Audible, Inc.

I rate The Fold a 6 out of 10 and recommend it to anyone who has run out of other books to read.

AudioBooksFiction

The Martian by Andy Weir

I have been hearing about The Martian from a lot of friends over the last couple of months and it sounded to god to be true so I put it off. I really shouldn’t have.

I bought the audiobook from Audible and listened to it about as fast as I could. It has a lot in common with the many recent stranded stories like Gravity and Cast Away, but it is so much better than them.

I highly recommend this book to anyone who has ever dreamed of Mars, being an astronaut, an engineer, or a space botanist. Really I recommend it to anyone at all, it is a great story and R. C. Bray does a fantastic job narrating the audiobook.

From the publisher:

Six days ago, astronaut Mark Watney became one of the first people to walk on Mars.

Now, he’s sure he’ll be the first person to die there.

After a dust storm nearly kills him and forces his crew to evacuate while thinking him dead, Mark finds himself stranded and completely alone with no way to even signal Earth that he’s alive – and even if he could get word out, his supplies would be gone long before a rescue could arrive.

Chances are, though, he won’t have time to starve to death. The damaged machinery, unforgiving environment, or plain old "human error" are much more likely to kill him first.

But Mark isn’t ready to give up yet. Drawing on his ingenuity, his engineering skills – and a relentless, dogged refusal to quit – he steadfastly confronts one seemingly insurmountable obstacle after the next. Will his resourcefulness be enough to overcome the impossible odds against him?

©2012 Andy Weir (P)2013 Podium Publishing

I rate The Martian a 10 out of 10 and recommend everyone give it a read.

AudioBooksFiction

Hard Luck Hank: Basketful of Crap, Book 2 by Steven Campbell

Hard Luck Hank is turning into a great series; Steven Campbell keeps the action and the humor coming in the second installment.

There really isn’t much more to say about Basketful of Crap, it is more of what made Screw the Galaxy so good.

From the publisher:

Hank was a dying breed on the space station Belvaille. The criminal gangs that had once made their homes there were forced out by the corporations that had taken over since the facility became an Independent Protectorate. Instead of the gentlemanly gang wars that had once dominated the scene, and made Hank’s services prized as a negotiator, the city was now plagued by the clash of corporate armies using heavy weapons. Even tanks roamed the streets regularly. Most everyone from the olden days had either fled the station or was killed due to the organizational changes. Changes that Hank personally brought about when he had negotiated Belvaille’s status with the Navy. As Hank contemplates whether he can survive in this increasingly hostile environment, he realizes that things aren’t as bad as they seem – they are quite a bit worse. The constant power plays among corporations might have further reach than just the alleys of a backwater space station at the edge of the galaxy.

©2014 Steven Campbell (P)2014 Steven Campbell

I rate Hard Luck Hank: Basketful of Crap an 8 out of 10 and recommend it to anyone that enjoyed the first one. I am really looking forward to the next one.

AudioBooksFiction

Hard Luck Hank: Screw the Galaxy by Steven Campbell

Hard Luck Hank by Steven Campbell really scratches my Sci-Fi itch. Straight-forward science fictiony goodness with plenty of humor and action.

The writing reminds me a lot of the Stainless Steel Rat series of books. Lots of good nature humor, although with Hank there is a lot more smashing and crunching involved instead of the happy go-lucky larceny of the Rat.

The narrator Liam Owen does a great job with Hanks character, he brings a sense of toughness to him without taking away his humanity.

I really enjoyed Hank and the other citizens of Belvaille and I am excited to have found another series of books to dive into.

From the publisher:

Hank is a thug. He knows he’s a thug. He has no problem with that realization. In his view the galaxy has given him a gift: a mutation that allows him to withstand great deals of physical trauma. He puts his abilities to the best use possible and that isn’t by being a scientist.

Besides, the space station Belvaille doesn’t need scientists. It is not, generally, a thinking person’s locale. It is the remotest habitation in the entire Colmarian Confederation. There is literally no reason to be there.

Unless you are a criminal.

Because of its location, Belvaille is populated with nothing but crooks. Every day is a series of power struggles between the crime bosses.

Hank is an intrinsic part of this community as a premier gang negotiator. Not because he is eloquent or brilliant or an expert combatant, but because if you shoot him in the face he keeps on talking.

Hank believes he has it pretty good until a beautiful and mysterious blue woman enters his life with a compelling job offer.

Hank and Belvaille, so long out of public scrutiny, suddenly find themselves the epicenter of the galaxy with a lot of very unwelcome attention.

©2013 Steven Campbell (P)2014 Steven Campbell

I rate Hard Luck Hank: Screw the Galaxy an 8 out of 10 and recommend it to anyone that enjoyed The Stainless Steel Rat books.

AudioBooksFiction

Code Zero: Joe Ledger, Book 6 by Jonathan Maberry


Jonathan Maberry and Ray Porter do it again with another Joe Ledger audio book. Code Zero is everything I love about the Joe Ledger series, action, action, and a bit of angst.

The highlight of Code Zero for me was the inclusion of DragonCon, I met Mr. Mayberry at DragonCon 2014 and got a couple of great photos of him. His panels were very interesting if a bit heavy on the talk about zombies and meeting him just made me want to read more.

From the publisher:

For years the Department of Military Sciences has fought to stop terrorists from using radical bioweapons – designer plagues, weaponized pathogens, genetically modified viruses, and even the zombie plague that first brought Ledger into the DMS. These terrible weapons have been locked away in the world’s most secure facility. Until now. Joe Ledger and Echo Team are scrambled when a highly elite team of killers breaks the unbreakable security and steals the world’s most dangerous weapons. Within days there are outbreaks of mass slaughter and murderous insanity across the American heartland. Can Joe Ledger stop a brilliant and devious master criminal from turning the Land of the Free into a land of the dead?

Code Zero, a Joe Ledger novel from Jonathan Maberry, is the exciting direct sequel to Patient Zero.

©2014 Jonathan Maberry (P)2014 Macmillan Audio

I rate Code Zero an 8 out of 10 and highly recommend it to anyone that has been reading the Joe Ledger novels.

AudioBooksFiction

Amateur Radio Technician Exam

As you may have read in previous posts I studied and took the Amateur Radio Technician Exam recently, it was a great experience.

I bought a study guide and read it on a Kindle and the iOS Kindle app then took around 100 practice exams using an iOS app. All told I spent about 5 days studying after work and at lunch.

Using the National Association for Amateur Radio’s website I was able to find a local test which was on a Saturday morning at a local church around the corner from my house.

I showed up a bit early and met a great guy in the parking lot who would be helping with the testing who had a remarkable radio system setup in his car. He told me that he had talked with people in Russia from the unit in his car that is pretty cool. After awhile other began showing up.

There was only two of being tested that morning; we began around 9am after the retelling of a number of stories about our experiences in the military. Most of us had been in the Navy.

The technician exam went fast and after being told that I had passed I was offered the chance to take the general exam. That sounded like a great idea so I gave it a shot. Sadly I did not pass that one, I had not studied for it and did not know the terminology used in the test.

I recommend that if you are going to take the technician exam to spend some time also studying for the general exam, you may be able to get both of them on the same day.

So that was on Saturday, on Monday afternoon the examiner called me to let me know that I was in the FCC database and I could begin transmitting!

I am now known as Dave Kilo Mike Four Julliet Whiskey X-Ray (KM4JWX).

ElectronicsHamHam Radio

Amateur Radio Exam Prep: Technician by Patrick J Maloney LLC

Amateur Radio Exam Prep: Technician is an iOS app for iPhone and iPad to help you pass the ham radio technician exam. I am taking the exam to get my license so that I can legally use 5.8GHz video transmitters for first-person view remote control flying.

This app with a good study guide should easily get you through the technician exam. I read a study guide and took about 100 practice exams before taking the test and only missed 2 questions.

I think the best feature of the app is the ability to see the questions you have missed after taking a bunch of test exams so that you can see exactly where you are falling short. That was invaluable to me and the only reason I did as well as I did.

If I decide to take the general exam I will definitely be buying the app for that test also.

I rate Amateur Radio Exam Prep: Technician a 10 out of 10 and recommend it to anyone preparing to take the Technician exam.

Electronics

The No-Nonsense Technician Class License Study Guide by Dan Romanchik

To legally use a 5.8GHz video transmitter in the U.S. you need at least a Technician Amateur Radio license. It is not a hard test, but I wanted some study aids to make sure I only had to take the test once.

A little bit of searching on Amazon led me to The No-Nonsense Technician Class License Study Guide (2014 edition): For tests given starting July 1, 2014 [Kindle Edition] for a very reasonable price.

It is a very good book covering only what you need to know to pass the test without a lot of fluff that many of the other study books include.

I rate this book a 10 out of 10 and recommend it to anyone who wants to quickly learn what it takes to pass the Technician license.

P.S.
I passed my test only missing 2 questions after reading this book twice and using an iPhone app to take around 100 practice tests.

BooksNon-Fiction