Happymodel Mobula6 ELRS & Moblite7 will be awesome whoop builds just by swapping their FC! Thanks to Angry Don FPV!

[Updates on 12th Oct 2021] Thanks Angry Don FPV for the tips when migrating CrazyF4 ELRS FC to Moblite7.

Now, you can finally build Angry Don FPV true Mobulite6 ultralight tiny whoop since Happymodel has finally released all the parts needed in the market. Unfortunately, there are no BNF/RTF of such build in the market yet. Following are the key components that contribute to this ultralight tiny whoop formula.

➡️ Super lightweight Diamond F4 FC @ 4.19g (released along with Moblite6 and Moblite7)

➡️ Super lightweight SE0702 26000KV motors @ 1.46g each (released along with Mobula6 ELRS)

Well, you can always get these parts separately and build your own ultralight tiny whoop. However, if your deep pocket allows, I suggest that you get both Mobula6 ELRS and Moblite7 to get the best of both worlds. By applying “FUSION!” to these BNF/RTF builds, you can get a super-fast responsive 65mm indoor racing tiny whoop and a long-range responsive 75mm outdoor freestyle whoop.

Although getting these awesome whoop builds are simply just by swapping their flight controller, there is actually a history behind this 65mm formula. So, let’s get juicy!

History of Angry Don FPV true Mobulite6 ultralight Tiny Whoop Formula

Don Johnson aka Angry Don FPV who used to be from Team Happymodel, is one of the most prominent tiny whoop enthusiasts who strive to get the most efficient whoop builds. Like Mr Shutterbug, he believes in shaving as much weight as possible to improve the performance of these tiny little racing quads. Around October 2019, Happymodel consulted Don on the next generation of tiny whoop build and Don suggested for a tiny whoop with lightweight 0702 motors and a super light F4 FC.

Following is the conversation of Happymodel and Angry Don FPV (source from Angry Don FPV awesome Youtube video).

On 21st October 2019, Don uploaded below video on how he shaved weight on a tiny whoop perhaps as a proof of concept for Happymodel’s reference.

Don also used Happymodel Diamond VTX as a mockup for them to design a lightweight AIO flight controller in the form of a diamond shape in order to create a low-profile tiny whoop build.

Happymodel released Diamond F4 AIO FC

On 7th December 2020, Happymodel has finally released Don’s dream FC, the Diamond F4 AIO FC which is based mostly on Don’s feedback. However, to Don’s disappointment, this lightweight FC is not been used in his 65mm formula. Instead, Happymodel decided to use this flight controller for Mr Shutterbug’s 75mm formula.

On 10th January 2021, with the readily available Diamond F4 AIO FC and prototype 0702 motors, Don uploaded another video to further prove the efficiency of his 65mm formula.

Happymodel happily making Angry Don FPV angrier

On 2nd September 2021, Happymodel finally released the 0702 26,000kv motors to the market along with Mobula6 ELRS. There are mixed reviews on this Mobula6 ELRS and some of them questioned the efficiency of these motors. Albert Kim is one of the reviewers that questioned the selection of the motor size+kv and Happymodel replied that this motor size+kv is requested by Don. This is perhaps Angry Don’s final straw towards the limit break and Bahamut ZERO unleashed. In below video, Don clarified that these motors are optimum for tiny whoops that are weighed below 18g and Mobula6 ELRS are far too heavy for these motors.

The reason for the additional weight of Mobula6 ELRS is due to the heavier flight controller, the CrazyF4 ELRS FC which is 6.24g overall in weight. Compared to Diamond F4 FC (4.19g), this new flight controller is 2 grams heavier for an additional ELRS SPI receiver. Two grams of additional weight on a tiny whoop is around 10% weight gain which is a significant impact on its efficiency and performance. This is quite puzzling especially when Happymodel ELRS receiver EP2 is weighed around 0.5 grams.

Don also did feedback to Happymodel that 26,000kv is too high but perhaps this high KV is to compensate for the weight inefficiency of Mobula6 ELRS.

Deep Dive into Angry Don FPV true Mobulite6 ultralight Tiny Whoop Formula

To get this build, you just have to use Diamond F4 FC on Mobula6 ELRS. ELRS is an awesome protocol for its range and low latency but for 65mm tiny whoop, range is not so important due to its flight time. Plus, you can get a lower latency on Diamond F4 FC by using Redpine protocol which is running at 666Hz vs ELRS 500Hz. By switching to a lighter FC using Redpine protocol, you will get a super-fast responsive 65mm indoor racing tiny whoop. Do remember to use Don’s canopy which will bring Diamond F4 FC’s shape to the fullest potential.

Long-range Responsive 75mm Outdoor Freestyle Whoop Formula

Based on Mr Shutterbug’s 75mm formula, the Moblite7 is one of the well-loved freestyle builds. However, the Frsky SPI receiver on Diamond F4 FC is really not for the faint-hearted especially during freestyle. This is why by moving the CrazyF4 ELRS FC into a Moblite7 build will significantly increase its range and responsiveness. By eliminating failsafe out of the picture, you will definitely be able to do more bold freestyle maneuvers. However, one important thing to take note of is that Moblite7 motors are directly soldered to Diamond F4 FC, therefore you will either need to have motor connectors for the CrazyF4 ELRS FC. Alternatively, if you want to put your solder skills to the test, you can remove connectors from CrazyF4 ELRS FC and solder the motors directly to its tiny weeny motor pads.

Lightweight might not be Everything

An ultralight 65mm tiny whoop is definitely a performance build in terms of speed, control and flight time but it all depends on the type of race. From my experience setting up Whoop Arena Singapore, the most common tiny whoop motors 0802 are extremely powerful that they can disrupt the airflow especially when an ultralight build is flying beneath. This ultralight build is good when you are going for time trials, tight tracks or even specs race if Happymodel chooses to release this formula as an RTF/BNF.

Below video is the final race at Whoop Arena. Feedback from one of my fastest pilots is that the 0802 motors are blasting his lightweight build away so choose your quads carefully especially during a head-to-head race.

Anyway, there is no ONE WHOOP to rule them all, so gather your fleet and keep whooping! Cheers!

Do also check out my Hobby Arena by NOTCHBAD for more Ready-To-Fly quads for side-to-side comparisons.