4inch with naked Gopro

By kolakowski on Feb 22, 2020

12  584  11

Another 4inch all-rounder but with gopro onboard this time (naked gopro 7 black). It's only 255g and performs amazing.

Ways to lose more weight (for caddax vista xD or .... Remote ID):

GNB 650 4s (83g) = > Tattu 650 4S (70g) = 13g
Pololu 5V, D24V50F5 (4g) => iFlight Micro 2-8S BEC - 5V (0.8g) = 3g
Predator Mini V2 (13g) => Foxer Predator Nano (5g) = 8g
Immportal V2 (4g) => Mini Immortal = (1g) = 3g

Further research:
Try diffrent motors like: RCINPower GTS-V2 1506, TMotor F1507, Avenger 1507

Video: https://www.youtube.com/watch?v=m182M8NTN6A&feature=youtu.be

Discussion

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Kstone   Feb 25, 2020  

The Tiger Motors are pretty heavy at 15g each! Odds are that the Tiger motors can easily pull more current than what that 4S battery can supply. (20A+ per motor)

Have a look at Xing as their motors are 6-7 grams each with an 8-12 amp max draw. Those should be good for 2.5 - 3" propellers.

1204-4500kv's https://www.iflight-rc.com/index.php?route=product/product&path=110&product_id=1094&limit=50
or
1105-4500kv's https://www.iflight-rc.com/index.php?route=product/product&path=110&product_id=998&limit=50

With 4" props look at these...
1404-4600kv's https://www.iflight-rc.com/index.php?route=product/product&path=110_245&product_id=895

kolakowski   Feb 28, 2020 

thanks for suggestions 👍 what about battery for 1404/4600? (Currently I use [Gaoneng 650mAh 14.8V 80C 4S1P] 80g)

Kstone   Feb 28, 2020 
1

Three considerations here...

How you intend to fly
Full Acro or just make videos... Acro flight will require a higher C-Rating as well as 3 or 4 bladed props. (3" is likely best) Yet for video, use the largest 2-Bladed, low pitch prop you can fit on the frame for higher efficiency. This will allow you to run a lower C-rated LiPo, save weight and have much longer flight times.

Weight
Regardless of how you answer the first question, weight will always be your most signifigant issue. Too heavy, the copter will perform poorly, have short flight times, motors will run hotter and the copter will be less resiliant in a crash. Ideally, you should focus on gear thats AIO (All in one) to consolidate your hardware, eliminate wiring and save weight whereever possible. Keep in mind that the GoPro is great for a 5" or larger quad but is nothing but dead mass on anything smaller.

Batteries
Look for the smallest mAh battery with 45 + C-Rating. (450 mAh is the smallest 45C LiPo i have seen) Be aware that increasing either the C-Rating or the mAh makes the battery much heavier. You'll quickly reach a point of demishing returns as the LiPo's stats improve your copters flight performance will deminish.

Kstone   Feb 28, 2020 
1

Those 1404's are rated at 12 Amps each or 48 Amps for all four. Next consider that a batteries burst current is normally twice the listed C-Rating. Thus with a 45C battery you should be able to max out at 90A for 2-3 seconds without damaging the battery. Be aware that the battery will still sag at any point above 50% throttle. Thats just the LiPo's internal resistance changing due to heating. Having a higher C-rating will reduce that but not by a signifigant amount to justify more than a 45C LiPo. (added weight)

mAh
IMO a battery should be no more than 30-40% of the total mass of a copter if you want a reasonable TWR. Besides lower mAh LiPo's are really cheap and this allows you to carry more packs into the field. Now so long as your total fight time in aggressive Acro is around 4 minutes your golden.

Air_Johnson   Feb 22, 2020  

All that hot glue is so nasty, but I love how it looks. Great work woth the gopro nudity, and the overall functionality of this build 

kolakowski   Feb 23, 2020 
1

thanks man 👍 glue has even more drawbacks:

  • when vtx gets hot, it drifts :)
  • gp7 stops to record because of bad airflow when it's warm outside :)

..need 3d print for it :)

Air_Johnson   Feb 23, 2020 
1

ewww sounds like it can become a mess! if you dont have access to a 3d printer, I can print for you. just send me a .stl file!

Kstone   Feb 25, 2020 

Just get the Caddix or Runcam split mini and save yourself the trouble.

StickyRice   Feb 25, 2020  

You make hotglue look like a work of art

kolakowski   Feb 25, 2020 
1

😆👍

sergetania   Feb 22, 2020  
1

Two-eyed drone! 👀 Very cool that you only have one prop in the view! That thing moves! Good job and good flying! 👍

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