Squashed Frog (1S, Brushless, 2", 1103, 26x26)

By crisat on Nov 26, 2018

5  398  6
  • I wanted a very robust 1S 2 inch brushless quad for outdoor fying, to learn flying 5 inch drones.
  • A whoop style quad was not an option, because propeller guards not only give a different flying feel than larger quads but also are very difficult to clean when grass stains them. Also the plastic frame, 703 motors and 40 mm props seem very delicate.
  • 2S batteries are difficult to charge in the field. Instead 1S batteries can be easily charged with a power bank. 2S are also too powerful for my flying skills.
  • I tried various 16x16 FC + Esc, but they have too many parts and soldered cables that end up breaking soldering pads.
  • As far as I know, this is the first time a whoop style FC (i.e. with 26x26 mounting holes) is fitted in a frame with 20x20 mounting holes.
  • It flies for 3 min, when 260 mah batteries are charged up to 4.2V.
  • It weighs 42.3g.
  • I built a 20x20 to 26x26 adapter by hot glueing 8 nylon 2.5 mm screws.
  • It is very flat and compact: it seems robust and easy to clean.
  • A better FC adapter could be 3d printed.
  • We could use a lighter carbon fiber frame (the bottom plate I used is 10g) or a 3d printed one: for example the tiny shark frame is 4g less.
  • Using the Pro version of the same FC (the one used in the Mobula 7), it could fly with 2S (i.e. 1S+1S).
  • A lighter AIO camera can also drop the weight by another 1g.
  • Perhaps lighter props can also be used.
  • Additional mischellaneous parts not listed below are 4 x Jst 3 pin 1.25 mm pitch female connectors and 2 x nylon standoffs with 2 mm screws.
  • The orange Sainsburys color is ideal for camouflage in the autumn leaves, so that the drone can be lost easily.

Photos

Discussion

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le_vinsky   Nov 29, 2018  

I love the hotglued adapter and the camo.

DPJ   Nov 27, 2018  

I really like the idea behind this. After just finishing my 2 Inch ELF build, and it being a giant pain in the backside, I wish i'd seen this earlier haha

crisat   Nov 27, 2018 
1

Thanks. What I like of this build is the simplicicy, the robustness and that it is very flat.

Jodie Froster   Nov 27, 2018  
1

It flies with just one screw per prop? vibrations aren't crazy?

DPJ   Nov 27, 2018 

I noticed that. The balance would be off surely?

crisat   Nov 27, 2018 
2

I flew it with one screw per motor with not much vibration. But I will add 1 more and see how better it is. I did not know it could affect the flight quality. Thanks for the suggestion.

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