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TIPS and TRICKS

MOBULA7 UPGRADE: More power with better battery connector

5/2/2019

21 Comments

 
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Introduction
In order to run 2s, the Mobula 7 comes standard with 2 x PH2.0 connectors that allow you to run 2 x 1s batteries in series. When running in series the strength of the connection is determined by the weakest link in that circuit. The strength of connection determines the maximum current that can pass and the voltage drop that results. Although it works this system has a very low current overhead from a design perspective - 2 x budget PH2.0 connectors with the dreaded 'folded' pin and very lightweight 26AWG wire. All this adds up to a lot of voltage drop when even reasonable current is pulled - something all will be familiar with on the mobula where you see voltage drop to scary levels (6v and below) during punches even when you have a full battery. Although it recovers almost immediately it does mean you don't get access to the battery's full voltage potential.

New Update: Read here how to convert your 1s batteries to a 2s battery
This is the second article in my series of HappyModel Mobula7 upgrades, many of which can be used for the Trashcan too. Also to come are:
  • Swapping to a much more durable frame​
  • tuning betaflight filters more specifically for brushless whoops, 
  • converting to run 'props out' 
  • propeller upgrades. 
  • receiver range improvement
  • modding your 1s battery to be a proper 2s
All links will be updated here when completed. Many of these I've completed the work and am testing at present - it's starting to feel like a more complete little quad now. If you're looking for my review including setup it can be found here
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JST connectors are very cheap, light and perfect for this application
How to improve the situation
Now that we are through the dreaded theory we can get on to the solution. To cut to the chase I will be moving to a true 2s battery connection with a JST connector and this is why:
  • 1 x JST connector will allow much more current than 2 poor quality PH2.0 connectors
  • 20-22AWG (guage) wire has a lot less voltage drop that the 26AWGwire included
As a bonus this makes it more durable. Although I used a 20AWG in this walthrough, I'd recommend these 22AWG ones because they are much more easy to solder and manage. In order to keep you motivated I'm pleased to say this makes a significant improvement to power and reduction in battery sag, more in the conclusions at the end. 

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21 Comments

Mobula7 Walkthrough Upgrade: The best Frame for your Mobula 7

28/1/2019

11 Comments

 
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PictureThe Mobula7 v3 frame (same as the Eachine trashcan frame)
Introduction and why I like the Mobula7 better.
It's been a few months since I reviewed the HappyModel Mobula 7 (here) and have more recently reviewed the Eachine Trashcan here. Since reviewing the Trashcan I've been flying the Mobula 7 more and find I actually prefer it. Why? Even thought the image quality is better I can't get used to the narrow vertical field of view on the traschan's EOS2 16:9 camera and I find the 0803 motors on the trashcan draw too much power on without delivering a whole lot more speed. The Mobula7's major downside is the frame which breaks easily even though the v2 frame is an improvement and e6000 glue (as tested here) is great for repairs.

For this reason I've written an article for newcomers on how to upgrade to the V3 (trashcan) frame which completely addresses the strength issues.

This is the first article in my series of HappyModel Mobula7 upgrades, many of which can be used for the Trashcan too. Also to come are:
  • installing a better battery connector,
  • tuning betaflight filters more specifically for brushless whoops,
  • converting to run 'props out'
  • propeller upgrades.
  • receiver range improvement
  • modding your 1s battery to be a proper 2s
All links will be updated here when completed. Many of these I've completed the work and am testing at present - it's starting to feel like a more complete little quad now.
Instead of just writing about it, please see the steps below with captions. Click on the picture to embiggen
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1. Remove all of the motor plugs from main wires. You can just pull the wires but I'd recommed small needle-nosed pliers to pull on the plugs instead
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2. Shown here with all 4 motor wires removed.
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3. Use the included Phillips head screwdriver to remove the 3 screws that secure the canopy to the frame. Don't lose them!

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11 Comments

Eachine Trashcan: Improving the Beeper with software only

7/1/2019

4 Comments

 
Picture
Introduction
​Recently I've reviewed the Eachine Trashcan and in many ways it is superior to the Mobula7 as I found in my review here. One omission from the trashcan though compared to the Mobula7 is the lack of a physical beeper. On the upside though is that the trashcan (like most other brushless quads) uses Dshot as the ESC protocol meaning you can use the motors as a beeper. This is in fact immediately available on the Trashcan with some simple software changes which I will outline below.


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