It's what I do that defines me.
Today's a great day because I get to introduce to you my new 3 1/2 inch micro FPV quadcopter frame design,
The Bat!
Of course, I'll go over some of the unique design features, but first I'll show you how
the Bat flies with a short flight video, show you my PID and filter settings for my Bat Quad
build, and even let you see the gyro spectrograms from its blackbox log to give you an idea
of just how electronically quiet the Bat actually is.
Before we get started, make sure to hit that thumbs up button below and subscribe to your
TMac FPV Channel - your home for your Journey to Better FPV fun, flights, and racing stuff!
Alright, for this Bat Quad build, these are my PID settings.
I've disabled D-Min and I've moved the sliders as you see here.
And, my filter settings.
I've left these at their defaults and these values down here you see have been modified
from their default values.
All right.
What I'm going to show you now is the filtered gyro spectrograms for the flight, which you
just observed
in the flight video. These are the noise graphs, if you will, that I referred to earlier on
in the intro.
The signal or noise amplitude would be on the Y axis and its frequency would be on the
X axis.
Your stick commands are down here below 100 Hertz.
So, if we were seeing any noise on the roll axis after Betaflight filters were implemented,
we would see more of this green stuff up here along the X axis.
And we don't.
Let's take a look at the pitch axis.
Basically, the same thing.
Look at that!
Very quiet.
And the Yaw axis?
Same.
So, what this tells me is the Bat frame kit can be extremely electronically quiet and
this build with the Bat frame kit is an extremely quiet build.
So, why did I take some time to show you how well the Bat Quad flies and just how electronically
quiet it can be if today's video is about the Bat frame?
Well, I want to make sure you believe me when I let you know it's a 3 1/2 inch 3D printed
quad frame!
That's right, it's 3D printed with some special carbon fiber infused filament I was able to
get ahold of to use for this design.
That's great, but what does that mean for you?
Well, since I'm able to print carbon fiber infused frames, that just means their designs
are only limited by imagination and your inputs, which I'm happy to hear if you just put them
down in the comments section below or shoot me an email at tmac@tmacfpv.com.
It also means I can make them at a lower cost, which I can then pass on to you in savings.
That's important to make FPV flight affordable and accessible to as many pilots as possible.
So, let's take a closer look at this Bat frame kit.
All right, here's what the Bat Quad looks like coming fresh off the printer.
It flies great as is without any additional prep, or it can be sanded a bit and then painted
if you'd like.
Here's the results after a little bit of sanding, spot putty, and painting similar to what I
did with the TMac FPV logo in my first 3D print project video you can check out through
a link below.
The base plate is about 3 1/4 millimeters thick and the top plate Is between 2 1/4 and
2 1/2.
This is a dual stack frame where you can mount two 20 by 20 stacks using these variable mounting
positions or even two all-in-one boards with 26 by 26 mounting patterns without using any
additional mount adapters.
Of course, you can have a 20 by 20 stack mounted up front or back with an all-in-one board
in the other position.
You can even mount the all-in-one boards, either diagonally as I've shown here,
or square to the frame - at both locations - depending upon your need.
It's your choice.
I've designed this frame to be as versatile as possible.
I'm going to build this one out as a digital Bat quad with a FatShark Shark Byte T X5S
.1 single board 26 by 26 VTX mounted up front square to the frame and the Diatone Mamba
F-722 Mini Mk 2 20 by 20 stack mounted in the rear.
Of course, for our Bat quad, it only seems fitting that I'll be using The Dark Knight
version of my favorite 1404 micro motors from Airblade UAV.
These happen to be the 2500 KV version, but you can also get them in the 3850 and 4850
Kv.
Alright, the Bat Frame kit comes with a base plate and the top plate, both of which are
made from a special carbon infused filament to add both strength and rigidity.
It comes with six aluminum 25 millimeter M2 knurled standoffs, which go in these six positions,
four up front and two in the back.
It also comes with a 3D printed TPU micro camera mount which just slides on the four
knurled standoffs up front like this.
And then you just put the standoffs up front like that.
Now, one thing I wanted to point out on this micro FPV camera mount is that it's narrow
enough height wise that you can slide it up and down on the standoffs to your desired
height.
So, it's variable in height for your FPV camera as well as variable front and back with these
three different mounting holes on either side.
So, you can use different ones of these based on the length of your FPV camera.
The kit obviously also comes with sufficient number of M2 screws which you can see here
I've already got in place up front and in back.
It's easy to assemble, great for beginner FPV pilots, and it's an efficient and effective
design.
All right, let's see what the completed build weighs in at.
150.85.
Nice!
How about with a 4S 750 milliamp hour Lipo?
237.51.
And let's go bigger with a 4S 1100 milliamp hour Lipo.
241.42.
That's what I'm talking about!
That's the three and a half inch micro FPV frame, the Bat!
Let me know what you think about it and make sure to check it out on the Pilots' Den Page
of my website at tmacfpv.com.
Until then, I got some flying to do!
Thanks for your time.
I'll see you next video.
Clear skies, friend!