mnemennth's blog View Details
Posted by mnemennth | Nov 04, 2016 @ 09:03 AM | 1,161 Views
A reminder of how important it is to temper what we post in public groups with a little common sense. This applies to ALL our hobbies, though I know a lot of us RCers are also into 3DP.

As useful and time saving as your favorite tip or trick may be, it is important to think proactively; imagine the worst that could happen and include appropriate safety warnings, no matter how obvious you may think those warnings should be.

Tom Taylor inquest - Lincolnshire Fire and Rescue Station Manager Ian Woods (1 min 26 sec)

See full article at


Food for thought; thought from food.
Posted by mnemennth | Oct 26, 2016 @ 02:36 PM | 881 Views
Working on a Stray Dog quad right now; this is my first ground-up RaceFlight build.

RTFQ Acro Revo, Liantian 150A linear PDB (Keep It Simple, Stupid ) modded with 7808 for 3S-6S power capability, and VGood FireFly 30A ESCs driving RCX H2205-2350s.

Testing these with KK5050HBN Trips netted me 890 grams @ 444 watts on my poor home test bench!

Still in layout stages, but most of the components are already decided on; really liking the feel of this build.

I expect to be in a nice modest 6:1 -7:1 range; concentrating on reducing unsprung weight. These motors are 22.46 grams as seen; ESCs are a little heavy at 7 grams with 16ga wires, but hey... you gotta have fat pipes for all that juice!

i'll update as the build progresses... hope it's as much fun as the last build!

Shout out to velez - Carlos, I LOVE this frame!
Posted by mnemennth | Sep 20, 2016 @ 12:22 AM | 1,788 Views
AirBot TS2207-2200KV Part 1 - Tech Teardown

Brand new motors from AirBot!

Let's see what they have to offer... and then see go the Thrust Tests in Part 2 below.

Vital Statistics:


33.49/33.89 grams w/o nut

0.60mm single winding

4mm x 9mm x 4mm NMB L-940ZZ Bearings

4mm Axle with m2.5 Cap/Screw retainer instead of circlip

5mm Propshaft available in CW & CCW (Standard thread) versions

AirBot TS2207-2200KV Part 1 - Tech Teardown (5 min 42 sec)

Part 2 - Thrust Tests

Part 2 of my Tech Teardown on the new AirBot TS-2207-2200KV multirotor brushless motor. Good numbers from this motor with a broad range of props; I still have to review and generate my spreadsheet, but looks like several 1500 gram runs and I believe I saw a 1600 in there.

Test Setup:

Turnigy BL Motor Thrust Stand

HK-010 WattMeter

Turnigy Servo Tester

VGood FireFly 30A 32-Bit ESC

2X Tiger Power Atomic-Platinum 35C 4S-6000mAH in Parallel - Charged to full between runs

Props Tested:

King Kong 5045 Blunt

HQProps 5545 Blunt

King Kong 5045 Hybrid Blunt Triple

King Kong 5050 Hybrid Blunt Triple

GemFan 5040 Thin Hex

King Kong 6040 Regular Profile

GemFan 6045 Regular Profile

HQProps 6045 Classic

AirBot TS2207 2200KV Part 2 - Thrust Tests (4 min 27 sec)
...Continue Reading
Posted by mnemennth | Sep 01, 2016 @ 01:23 PM | 3,804 Views
Harbor Freight Labor Day Coupons

Just got a whole SHEDLOAD of coupons in my Inbox; highlights (to me) were a FULL (1/16"-1/2") beater set of SAE drill bits only $13, 1500W Heatgun only $9, small generator for the field only $89, ELECTRIC 3" Cutoff grinder only $20, and SS Digital Calipers only $11; a full-size flag for only $7 rounds out my "Top 5".

See the full list here (Including a 3.2KW Predator Generator for only $275):

Hooray! Cheap tools!

Go ahead... flag me.
Posted by mnemennth | Aug 12, 2016 @ 12:43 PM | 2,369 Views

The RealAcc X-210 is better known as the Banggood “Charpu-X Clone”; there is no doubt that this is an out & out clone. Here I’ll try and evaluate the kit based on its own merits; and have a few laughs about it’s clone-ish-ness.

RealAcc X210 Tech Teardown & First Impressions (12 min 43 sec)

The RealAcc X-210 is better known as the Banggood “Charpu-X Clone”; there is no doubt that this is an out & out clone. Here I’ll try and evaluate the kit based on its own merits; and have a few laughs about it’s clone-ish-ness.

Vital Statisitcs:
4mm Main Plate
2mm Upper Body Plate
1.5mm all camera mount parts and battery armor plate
m3 x 30mm Standoffs

Main Plate: 63.77gr
All Carbon Fiber Parts: 80.92gr
All Hardware: 15.26gr
Frame & Hardware: 90.82gr
Matek XT60 PDB: 10.09gr
Battery Strap & Armor Plate: 10.12gr
Full Kit: 110.22gr

Quality appears better than average for China-direct hobby gear, and they do include a decent name-brand integrated PDB with 5V/2A switching regulator & 12V/500mA 7812 linear regulator. ESC outputs are rated 25A continuous; figure 30-35A surge current.

Frame plates measure out as promised; decent quality CF plate with nice weave, semi-gloss finish and lots of fine, close layers.

...Continue Reading
Posted by mnemennth | Jul 26, 2016 @ 04:57 PM | 2,231 Views
BG 10% Off!

Lookie what I found in my eMail today.... good till the 1st, and good on THIS:

There's a whole page of our favorite stuff right now, including their RacerStar Rebranded Cicada 20A ESCs for $34.19/set:

Oh hey... another code: RC20 good for an ADDITIONAL 20% OFF on clearance items on THIS PAGE:

...Continue Reading
Posted by mnemennth | Jul 24, 2016 @ 11:55 AM | 2,654 Views
Just a quick heads-up:

HobbyKing is offering FREE ECONOMY SHIPPING on any orders over $100 from the Hong Kong Warehouse, good til midnight.


If you've been waiting for a break to stock up on some LiPos or cheap ESCs / motors, NOW IS THE TIME.

Good Hunting!

Damn them... I just got paid.
Posted by mnemennth | Jul 12, 2016 @ 10:56 AM | 2,550 Views
If you're an Amazon Prime member (Or even if you've toyed with the idea of taking advantage of their 30-day free trial) right now they have Sandisk 64GB Class10/UHS-1 Micro-SD cards for $14.99 ea.

These are sold BY AMAZON, Shipped BY AMAZON, so very unlikely they are fakes.

They also have the 7" Kindle Fire for $33... would make a nice cheap Configurator tablet for your Flight Controllers, but you'll probably have to root it to get access to the Google Play store.

I just bought 2 of these cards. And 2 Kindle Fire Kids Edition Tablets... and a Fire HD 8 for my dad... The bastards.

Posted by mnemennth | Jun 09, 2016 @ 02:05 PM | 2,945 Views
Yeah, I know; lame name for a sale... but they do have some pretty good deals if you're quick.

Like two of their best FPV wings and two of their best high-current chargers and accessories for half off; plus some deals on batteries and FCs and a nice "little red quad" I'm thinking about for myself. You should be able to find something you like before it sells out!

Here are a few things that caught my eye:

I don't have time to make a proper page and tidy hypertext from this quick list; just hover over the link and look in your info bar to see what each link points to. The links are pretty self-explanatory.

Good Hunting!

*Cheap dwagon*
Posted by mnemennth | May 29, 2016 @ 07:39 PM | 4,609 Views
Performance FC on a budget: $10 CC3D W / ▀etaFlight and MultiShot!

For my latest project I went for a more performance oriented build; so I felt it was time to step up to a more performance-oriented firmware.

As my frame has a CC3D Atom tucked away inside, ▀etaâlight became the obvious choice.
The Atom is ~$14 from Banggood; regular CC3Ds can be had for as little as $10 delivered from eBay.

With ߃ 2.7, Boris B fixed the SPI bus write timing bug that has held back the CC3D for like... EVER.
Now it performs like we all knew it SHOULD, with considerably faster looptimes than even F3/I2C targets when running REWRITE in ACRO mode:

Originally Posted by Boris B
As the matter of fact CC3D is doing great job since the last version.

From the top of my head this is list for rewrite speed in acro mode:
1 F3 SPI 70us
2 F1 CC3D 166us
3 F3 I2C 190us
4 F1 I2C 230us
For CC3D the current stable build is ߃ 2.7.1, with 2.8 in testing. Paired with MultiShot 14.4 on your ESCs, you won't believe it's the same quad, even on stock PIDs.

Horizon mode stability with ߃/MS , even on 1K/1000uS looptime, (߃ defaults to 1000uS looptime/REWRITE PID controller on MST32F1 boards) is flupping amazing... with stock PIDs I was hovering hands-free with the Dragon's whiskers 1/2" off the floor literally just by raising the throttle. "It hung in the air exactly the way a brick doesn'...Continue Reading
Posted by mnemennth | Feb 25, 2016 @ 12:14 PM | 4,115 Views
Quad Building 101 : Drilling Carbon Fiber

About every other day I see a discussion on "Drilling CF" to enlarge a motor screw or make a hole for an antenna. I hear the usual "Oh, just get a drill and drill real fast" and "Oh, just tape it and you'll be OK" etc, but the bottom line is that dust from Carbon Fiber and the resin in it can be VERY dangerous if inhaled.

Aside from large, high-production CNC operations with high-velocity dust collection, cutting CF cannot be done dry with any level of safety, even with a mask.

Cutting CF & 'glas dry is a bad idea not just because of the likelihood of inhalation while cutting, but also because the microfibers float for a long time, so they get EVERYWHERE and contaminate your entire workspace and your clothing.

You can easily contaminate your own face and eyes with the dust by wiping sweat away while working; even hours later as the dust migrates from your clothing long after you've forgotten about the drilling you just did.

You can get slivers in your hands & arms arm from dust on the workbench a week or a month later that will itch and get infected and sting like a MoFo. I know from personal experience.

Diamond bits $8

I use a cordless Dremel and diamond bits like these to drill or cut under a trickle of water in the sink. Cuts quickly and very clean, just like the original manufacturing, and the water washes...Continue Reading
Posted by mnemennth | Feb 17, 2016 @ 03:23 PM | 4,125 Views
The Mailbox was kind to me last night; inside was an unassuming grey mailer of unknown origin, arriving to me from China via Sweden.

I've been waiting on a number of packages, so I really didn't know what it was until I got it in on the bench. Christmas in February!!!

RoboCat 270 Kit - $30.27 at

Initial impressions:

Very good quality kit; clean, smooth cuts, very snug fit on interlocking parts. Nice quality Molded ABS canopy & side covers with glossy finish; neat openings and easily paintable unlike vacu-formed polycarbonate bodies.

All plates 100% CF confirmed with continuity on multimeter.

All blocks & spacers made of machined aluminum.

205.50 grams total weight for bare kit.

Weight of all 3 cover pieces 19.65 grams.

Allright... Now I'm done with the initial impressions, time to get onto the build!


*Building the perfect beast*
Posted by mnemennth | Feb 10, 2016 @ 10:08 AM | 3,973 Views
My son needed a Recycle Robot for school. We made Recycle2D2!

...Continue Reading
Posted by mnemennth | Feb 03, 2016 @ 03:55 PM | 3,944 Views
FTDI Heads-UP:


Why do you care? Because pretty much every hobbyist micro-computer (Like those in our FCs, ESCs and OSDs) connects to our PCs via the chips these drivers use, or a similar chip from another manufacturer.

FTDI is the largest manufacturer of the least expensive versions of these chips, and, as a result, also the most counterfeited product.

Maybe it's time to just say NO! to FTDI... start using other brands of USB-RS232 converters.

If it ain't broke, DON'T FIX IT!!!
Posted by mnemennth | Jan 31, 2016 @ 04:47 PM | 5,108 Views
MAD SCIENCE! Converting My Dremel to Li-Ion Power!!!

So... my beloved Cordless Dremel has finally chugged its last... or at least, the 9.6V NiCd pack has gotten so weak it won't run 3 minutes on a charge. Time for a new pack!

But wait... Dremel has abandoned this model. Replacement packs are no longer available, having been replaced by... Li-Ion versions.

Well, I usually have a few Laptop packs to rob cells out of... I buy NOS ones off eBay that are being blown out due to being for unpopular models.

While the laptop packs cycle, I begin modding the pack. I disassemble the outer shell, then find this plastic tree that supports the battery contacts.

A Little work with my corded Dremel and Hot Glue Gun gets me to this point. Charge & Balance Connectors modded in place; after cycling a few 1S2P subcells, I find one that yields approx 4600mAH. This will probably produce a decent pair of cells I can turn into an 8.4V pack. Not the full 9.6V, but I'm pretty sure I haven't gotten 9.6V under load out of my NiCd pack in at least a year anyways.

Now that I have some good cells, time to solder it all up. A little foam, an insulator... already looking pretty tidy.

...Continue Reading
Posted by mnemennth | Jan 23, 2016 @ 01:49 PM | 5,103 Views
Gearbest Heads-Up: Robocat 270 $24.94 / FREE SHIPPING - ALL COLORS!

I'f you've been thinking about the RoboCat 270, and were waiting for it to come down in price... now's your chance!

Gearbest is offering all colors of this popular frame right now for $24.94 DELIVERED!

Integrated camera mount allows for use of the cheaper board cams, integrated XT-60 holder and included frame spacer kit is designed around a nice tidy "Between the lower plates" build with generous battery cavity right in the middle for best weight distribution that can fit up to a 4S/2200mAH pack.

Supports 18xx or 22xx power plants, recommend 35mm x 35mm PDB or FlyCat 260 PDB for easiest build.

RoboCat Video Manual (2 min 4 sec)

I'll be doing a Tech Teardown/Build Log of one in the near future... check back soon!

*Bigger, Faster*
Posted by mnemennth | Jan 16, 2016 @ 08:07 PM | 4,423 Views
In other news:

3000 posts and I didn't even realize. Time for a change. };=)~~~~<

I'm not sure.
Posted by mnemennth | Jan 04, 2016 @ 04:57 PM | 4,625 Views

I finally got around to building myself a proper Radio Tray; I'd been getting by with a horrible bodge made of 1/4" lauan plywood and long eyebolts. It was good enough for me to decide I really do want to continue my efforts at unlearning all my bad "Stick-banger" habits and going "Pinch-Style" all the way; but I really wanted arm rests. Nice solid ones for my great big "Popeye Arms" and "Shrek Hands".

Well, yesterday while unpacking I found 3 pieces of aluminum angle left over from dismantling a server; an idea popped into my head.

A quick trip to the Hobby Shop for an 8-32 Tap and to Homeowner Hell for some 3/8" aluminum Rod and I was ready; I'm dead chuffed with the results.

812 grams with straps.

My original plan was to just keep it simple; two angles as armrests held together by 200mm long pieces of 3/8" aluminum rod, which would also support the radio. Then I got to thinking...

Before long, I had contrived to use the 3rd angle to make the filler panel here. One of the other things I hated about most radio trays I've seen is how close they hold the radio against your body; this arrangement puts my arms at a very uncomfortable angle.

Instead of just a couple posts sticking up to clip to a neckstrap like most trays, the U-shaped arm allowed me to make a harness that criss-crosses behind the back, taking the weight off my neck and putting it...Continue Reading
Posted by mnemennth | Jan 01, 2016 @ 08:41 PM | 5,844 Views
HobbyKing is running a Flash Sale on the 9XR Pro; Only $69.99 this week!

In stock at the International Warehouse, but also available for Back-Order from the USA East Warehouse (Cheaper Shipping):

Or, if you can't wait and don't mind a little work, they have the Mode 1 version IN STOCK in the USA West Warehouse:

For those looking to get into a slightly better TX but can't afford a Taranis; this and an XJT module will get you almost everything the Taranis offers; there's even a version of OpenTX for it!

The DJT is $12 cheaper, but it doesn't support the latest Smart Port Telemetry or the X-Series receivers; these are both important for little quads like the ZMR250.

Posted by mnemennth | Dec 14, 2015 @ 01:21 PM | 5,156 Views
First, let me start out by saying that I support the AMA in their continuing fight against across-the-board registration of all model hobby aircraft. I know some folks feel that they threw the multirotor user base under the bus, but the reality is that the majority of those people are NOT members.

The AMA is NOT a government agency. They exist to serve their members, NOT THE PUBLIC, in the pursuit of safe model hobbyist flight. Their duty to the public is to do their best to make sure their members take reasonable care in the pursuit of the hobby, and as a part of that responsibility, they provide insurance in case of mishap for those members who DO fly responsibly.

The fact that they are the largest such recognized club, therefore the defacto point of contact for as many of said hobbyists as the government can easily reach, doesn't make it their responsibility to fight for every dumbass who can buy a turnkey quad, or to promote the idea that they should be able to do so without some level of responsibility.

The AMA has stood toe-to-toe against the Fed EVERY TIME they've tried to start proceedings like this. The ONLY thing they've done to the hobby is try to get everyone to fly responsibly.

When I first got into model RC aircraft almost 30 years ago, I was astonished to find that some government agency hadn't ALREADY mandated registration of ALL RC model aircraft.

I was out there with folks flying 80" planes with half-gallon tanks of 40% nitro; these...Continue Reading