Inverted 4S Whilrygig (3")

By 1Smug_Bastard on Nov 11, 2019

13  356  11

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

secretman   Jan 18, 2020  

where you plug your servo ? i try to make the same setup but servo fuck me up tank's

Show 1 more comment
secretman   Jan 18, 2020 

tanks that was what i was thinking about but wasent shure led can output pwm

secretman   Jan 24, 2020 

led output u already got grn 5v and signal

1Smug_Bastard   Jan 24, 2020 

I use the LED pad (remapped via Betaflight CLI for PWM), then the voltage tapped directly from the LiPo 2S battery. The battery is 7.4 volts and thus is ideal to use as the Servo source power. Just be sure to add a capacitor across so that voltage transients don't mess with then smoothness of the Servo. (100 uF @ 16v should do nicely)

Locng   Nov 28, 2019  

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   Nov 28, 2019 

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   Nov 11, 2019  

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

1Smug_Bastard   Nov 12, 2019 

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   Nov 11, 2019  

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

1Smug_Bastard   Nov 11, 2019 

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

PM me.

Guides & Reviews

21 4,406  20
Nov 30, 2019

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 3,964  12
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