Inverted 4S Whilrygig (3")

By 1Smug_Bastard on Nov 11, 2019

11  248  6

Built this up for a friend who wanted to try something really different yet didn't want to skimp on performance.

Note: The frame is completely custom of my own design so if your interested please PM me.

This Tricopter runs Betaflight 4.1 with motor filtering and has an attached Openlagger.
Weighing in at 142 grams with the 4S battery shown.
Thanks to the Emax 1108 motors, it boost a very nice TWR of 6 to 8:1. (Hovers around 12-15%)
I guestimate that just farting around you'll see a flight time of 4-6 minutes but full on crazy Acro may last 2-3.

Please be aware that I live in the EU so my over all cost is closer to $300 - 350.

Here is the video from it's sister craft (3" 2S Tricopter Whirlygig)



Sign in to comment

Locng   11 days ago  

Can you show me how to select rc servo? Can I use the emax 9051
Its much easier for me to buy from banggood or aliexpres. Thanks

1Smug_Bastard   11 days ago 

1st look up the dimensions of the Servo i listed as the spline size and tooth number is critical to the Tilt-Mechanism fitting on it.
2nd verify that the Servos width is similar , otherwise it will not be mountable on the frame.

Specs can be found there...

Beyond that, your free to find / use what ever you wish.

joshielevy   28 days ago  

Post a video! I'd love to see it running

1Smug_Bastard   27 days ago 

Its been shipped off but I'll attach the step-response so you can see how the in-house tuning went.

Only issue with this design is that Betaflight doesnt have much in the way of servo support. A while back we had Triflight, which was BF modified to allow for the servo endpoint claibration and in-flight tail tune. I'm hopeing that soon this will change and thus allow for better Yaw prediction.

Sasquads   28 days ago  

Dude, that looks awesome.
Is it a carbon frame or 3D printed?
I want to build one.....

1Smug_Bastard   28 days ago 

Its made from carbon impregnated nylon. Can bend allot before breaking yet is very very stiff.

PM me.

Guides & Reviews

8 645  2
9 days ago

In late 2019 DJI made inroads into the FPV scene with their remarkable low-latency digital system. It gave us a 720p video feed with latency on-par with the status quo, analog video. Traditionally we've used analog video systems for low-latency video, but the video quality is far from ideal. It's a trade-off we've been willing to accept for the control. Now we've got the best of both worlds and what..

Read more
3 2,418  9
Sep 18, 2019

When the FatShark HDOs hit the market in 2018 the FPV community rejoiced for the new Sony OLED displays. While they lacked further upgrades like an updated DVR and power button they were still a market success. With the 2019 announcement of the Orqa FPV.One the community finally had a potential HDO killer on the horizon. With only weeks before the release of the Orqa FPV.One Skyzone came out of left..

Read more