Goodbye Kitty, (aka the BD Cat 118) is ideal for FPV pilots who want to minimize weight and maximize thrust.

Designed specifically to get the best power to weight ratio from a 1S (3.7v) LiPo. When you get Goodbye Kitty kitted out with new SunnySky 0705 15000kv brushless motors, swinging 65mm (parrot) or 66mm (eachine Bat 105) props plus an all in one Omnibus flight controller, complete with 5A ESC, buzzer & OSD you will have everything you ever wanted in a 1S micro.

My calculations put this lightweight (1.5mm) chassis + (1mm) top plate at an approximate 7.4 grams.

3.1g for the Omnibus 1S FC & ESC,

3g per motor (12g total)

4g AIO FPV cam & VTX,

1.1g RX

Lets call it 3g for the standoffs etc...

You are looking at a dry weight of about 32.5g, very close to the Fullspeed Bat 100, but with more thrust from 10mm longer props!

The BD Bat 110 is designed to get the best performance and thrust to weight ratio from a 1s LiPo/LiHv battery.

This kit includes the 1.5mm thick chassis, the 2mm thick chassis will add just over 1.5g.

The BD Bat is heavily inspired by the FulSpeed Bat-100, in fact, you can build the components straight across, provided the motor wires are long enough?! Also consider that the frame has been designed for the larger spaced motor mounts, so may be incompatible with the smaller mounting of the RacerStar motors.

I have squashed the streched X format slightly, (despite the apperance the motors are almost exactly positioned for a true X) to get less prop in the FPV image. Also the arms have been extended to support use with 65mm (Parrot) and 66mm (Eachine) props to maximize the possible thrust from the motors. 

I have had a bad experience with my SunnySky 0705 brushless motors, so I would suggest trying the HappyModel 0706. Thanks to Konrad for the thrust data showing the 0706 producing almost 5g more thrust, at 0.2A less draw, than the 0705 with 56mm props. Bear in mind that the review of the 0706 also mentions bad vibrations, but only when using shorter props, however build quality might not be great with these motors and they use bushes rather than the bearings used by SunnySky. Konrad does not have 65 and 66mm props to provide data on these motors, but I have found a youtube video showing 65mm KingKong props producing almost 5g more thrust than 56mm Ladybirds on the racerstar 0703 10000kV which are smaller motors with lower kV.

SunnySky 0705 review

HappyModel 0706 review

RacerStar 0703 thrust test video

I believe that the larger 0706 motors will suit longer props better and might even show more than the 5g extra thrust from the 0703 racerstar's. However if we keep to that 5g figure and add it to the 59g given in Konrad's 0706 thrust test we get 64g per motor x 4 = 256g (static) thrust. On a model with an AUW (All Up Weight) of about 40g - 45g (depending on battery and chassis thickness), gives us a thrust to weight ratio of 6.4:1 - 5.6:1, I don't think you will find anything close to that with any other 1S model...?