UltraLight sub 250g 5 inch build

By freerider101 on Oct 27, 2019

8  535  4

I've been inspired by sub 250g 5inch attempts over the net. My goal is not speed but more on cruising, efficiency and long flight times. It's hard to find ultralight 5 inch frames in the EU. So far, drueckbaer's frames are pretty awesome. This is my first ultralight build attempt. I'm currently trying out the kingkong 5inch biblade. So far, it seems quite good, though I believe that it's drains a bit too much current with more than 1second punch outs. And thus, sagging the battery voltage too much.

With the the items I used, these are the flight times I have:
GNB 3S 450mAH : 3-4 mins
Tattu 3S 850mAH : 5-6 mins

It handles extremely well. With the stock PIDs, there is only a tiny bit of propwash which can easily be tuned out. The quad is extremely responsive. So responsive that I need to reduce P's a bit and thus also improving propwash performance.

I haven't weighed the quad yet but it's pretty light. From the components, it should be around 150g dry, maybe less. I will constantly update my findings (actual weight, props, battery etc..) here if someone is interested.

First FPV maiden:

Subsequent flights:

Some links that helped me out..



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newtrojan   Dec 11, 2019  

I am wondering if this could be converted to a DJI system

Elesar   Nov 07, 2019  

nice work!, i would try also airymotors 1306...should be ligher and more efficient bit maybe bi blade 5inch is too mich as they are well tuned for 4". Check the moby 4

Nightprowler   Oct 27, 2019  

Welcome in the ultralight Druckbär-family

freerider101   Oct 27, 2019 

Thanks. :) I'm actually looking into building a 5 or 6inch long range with a Druckbär frame but with a beefier 2207 or bigger motor. I can really see that weight helps a lot with efficieny. These ultralights react like speed-demons and flies like feather. I'm really mindblown. :)

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