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New 85mm Whoop Build

brettbrandon

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I have only done a hover test indoors so far but it feels pretty good and got over 8-1/2 min flight time on a 850mAh 1S.


z01.jpg

z02.jpg

z03.jpg

PARTS
~~~~
Frame - URUAV UR85/UR85HD 85mm - 8.5g
Motors - BetaFPV 1102 18000Kv - 3g ea
Props - HQ Prop Durable T2x2x4 Quad-Blade 2" - 0.8g ea
FC - HappyModel CrazyBee X V2.2 F4 1-2S AIO Whoop Flight Controller (F4 FC / 5A 4in1 ESC / 25-200mW VTX / FrSky RX) - 4.4g
Camera - Caddx Ant Nano 1200TVL CMOS PAL/NTSC FPV (1.8mm) - 2g
Canopy - HappyModel Crux3 - 1.4g
Power Connector - 22AWG Solid Pin Whoop Pigtail Connector - PH2.0 - 1.2g

Weight W/O battery - 32.7g

Battery - 1S 850mAh (RDQ) - 16.6g
Flight Time - Over 8 Min (Above Battery)
Hover - 40% Throttle

It will be a couple of days before the weather will let me try it outside so I will post back after some actual flight time on how it actually flies...
 

brettbrandon

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I am using the FC's stock PIDs and really only set my rates on it. It flies really well and I like this particular frame. The height of the ducts are a little shorter than typically found in a whoop frame. It seems to have less drag than the other frames I tried and so far have not had any prop wash problems. I've only had a hand full of flights and don't really do stunt flying but I did have that problem with the other 85mm frames I tried (they did have a different FC).

I tried using a 2S battery as it is a 1-2S FC, and the second I armed it, it started straight up with no throttle input. I had to disarm and let it fall back down into a bush. I have a feeling it has different PID/Rate settings sort of like the Tinyhawk 2 I have does. I have to check into that as it should be very responsive on 2S.
I have checked on this since, and no matter what it just takes off when armed.
The onboard RX and VTX are OK for what they are but I do get a fair amount of interference in the VTX compared to some others I have used.

Here is a vid clip from 2 flights. The first part is the same day I put it together but was just after sunset and the camera was really cranking up the light level. It can get a little washed out in lower light. The end has some from during the day.


I have never tried to power loop anything, just some loops here and there. Decided if I was going to try power looping something, why not myself? Never actually made it but got close a few times. I must say the quad is holding up well as it was getting crashed over, and over, and over... and kept on ticking.


Actual flight times I am getting around five plus minutes on a 650mAh and seven plus minutes on a 850mAh.

 
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brettbrandon

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Well I decided to try a Runcam Split 4 Nano 4K I have sitting here to see how that works out. Now I really wish I could get it to work on 2S...

85mm 1S-4K.jpg
 

brettbrandon

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This is now my favorite quad to fly. I am going to order another couple of these frames to experiment with as it is the perfect balance between flexibility and rigidity.
This is the raw dvr footage without any processing. It was recorded at 2.7k 60fps and exported at 1080p 30fps.

 
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