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THE SWEET-SPOT Value 5" FREESTYLE PART 2: Full Review

9/7/2019

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Recently I've built a 5" Freestyle quadcopter based on the best value components - not the cheapest but the best price/performance ratio (i.e. bang for buck). The components I've chosen plus comparison to alternatives can be found in the component selection article here. As it stands the build cost of this one is around $150-$170 depending on which specials you can take advantage of. I see the RC Addict (His YT channel here) has done a similar thing for a race build and he refers to it as the "The cheapest quad worth building"

This quad has since been built, setup, flown, adjusted and then flown a lot more. I'm now in a position to pass judgement over all of the components and will then cover as the quad in total. For each I'll look at the positives and negatives and then go into a little more discussion with my recommendations
Emax Eco series motor 2306 1700/2400kv (I used 1700kV)
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The Emax Eco 2306 is only $10-12 each in 1700kv or 2400kv
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Here are the 1700kv variants on my 6s build
Positives
  • Iconic Emax brand  - quality
  • ​Motors are very light (30g incl. wire)
  • Motors use 9mm bearings
  • Very smooth power delivery
  • Very efficient
​Negatives
  • Don't have the peak power of more heavier, more expensive motors
Discussion and recommendation
At the time these Emax Eco were chosen as they were the standout budget motor. They have been available for $10-$12 and based on how they perform represent outstanding value - the top equal standout recommendation for this parts list. Emax had the original breakthrouhg brushless motor in the quad scene - the RS2205s which changed the industry. While others have caught up since they still make well-researched high quality motors. The Eco series draws off the learnings from the LS and RS2 series - they remain VERY light but have increased the bearing size from 8mm to 9mm to improve durability significantly. Retained from the RS2 and LS series however are the thin magnets. Although these mean the motor doesn't make the same peak thrust as heavier motors with larger magnets, it does gain in improvements through being lighter, more efficient and smoother at throttle transition. This makes it a great match to freestyle where these positive attributes tend to be preferred over peak thrust @ 100% throttle. In use these are very nice motors to fly. They are quiet, smooth and cause less battery sag and longer flight time than more expensive motors I use such as the brother hobby returner R6 2306.

Interesting that based on the success of the Emax Eco, iflight and brotherhobby have followed suit. 3bhobby also have the training motor although this may have just been out when the emax eco was launched.
DIATONE MAMBA F405 MK2 Betaflight Flight Controller/40A 3-6S Brushless ESC

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The sweet-spot 5" Freestyle Part 1: Component Choice

22/5/2019

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I have decided to piece together a bang for your buck freestyle build to coincide with the summer in the Northern Hemisphere. My objective for this build was not to build the cheapest quad but the best value. This means parts will be from recognised brands with a good track record of performance and reliability with a good degree of future proofing. To be clear, this is not a $99 build, it is more like $150-$170 but will be more reliable AND outperform any pre-built quad and will easily hold it's own against something double or triple the price - I like to think of it as the Sweet Spot.

This Sweet Spot Quad will be split into 3 parts:
  1. Component Choice (this article) 
  2. The Build
  3. The Review and Recommendations. Update: now completed
I've chosen to build this as a 6s but going 4s is simply a case of choosing the higher kV motor variant and retaining the overhead if you decide to upgrade to 6s in future.
For each key component I'll show you what I chose, a cheaper option and a more premium option with price indication and justification. Let's get straight into it!!
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All the things!
 Motors
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This was the first and easiest part I chose - the new Emax ECO 2207/2306 at $10-12 each. These are simply outstanding value for money. They have the legendary Emax heritage, 9mm bearings (a big upgrade over the more expensive RSII and LS series) are relatively lightweight and are available in 1700 and 2400kV variants, suitable for 6s or 4s respectively. Magnets are not as strong as some motors but this is ideal for freestyle where smoothness and efficiency improves greatly at only a small cost to brute force. I've chosen 2306 because I think these are better suited to freestyle (2207 for racing)
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Budget option: No change, would stick with the Emax Eco
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Premium option: Brother Hobby Returner R6 2306 at $20-$25. Only a minor step up in power but double the price.
Flight Controller/ESC

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