Purple Sky (Druckbär Ultralight 3 / Ultralight Race Upside down Remix)

By Nightprowler on May 17, 2019

14  406  18

The goal was a 5'-Copter under 250g because of local restrictions.
I really like the frame designed bei Christian from Druckbär racing frames.
I started with the standard 5' frame. After some issues with touching props I modified the center body with the racing arms and changed the position of the arms to the upper side.
I'm still a beginner in fpv-flying but I really like that frame.
I also tested biblade-props but I prefer triblades even with the higher weight.



Sign in to comment

IcarusIX   May 21, 2019  

performace? speed? also what biblade props did u try? Also props, this looks like one of my fave builds here

Show 2 more comments
Nightprowler   Jun 07, 2019 

Thanks for the tip, sounds like a try :-)

Nightprowler   Jul 27, 2019 

So guys, I have accepted your questions as a challenge. I ordered the following props:
Kingkong 5040 2.3g
Emax Avan-S 4.1g
Dalprop 5050C 3.9g
Racekraft DCS 5038 3.5g

Kingkong 5040 3.9g
Dalprop T5040C 4.1g
T-Motor T5143 3.8g
Racekraft S5048 4.3g

The old adage "Never change a running system" was probably never as correct as here: The copter flies with triblades wonderfully, with biblades it is a pure material battle.

With the triblades he flies like a machine and I am wonderfully satisfied with my flying style.
With the biblades, the engines turns higher, and the consequence is that I lost a total of five arms and three motors in 5 attempts with biblades. Every time clean demolished right behind the engine.

At first I could not believe it was actually the biblades, but none of the problems occurred in any way with the triblades.
Unfortunately, I have little data from the biblades because the arms are broken really fast. The arms are broken even on a purely vertical flight!
On very gentle flight I had slightly longer flight times (definitely without fullspeed share) but not surprising because of the careful flight. The amps were accordingly a little lower.

Thanks to you, I have now found a new favorite triblade: T5143 from T-Motor. (In second place are now the Dalprop and the Racekraft, even the 48pitch )

Concerning the biblades, the kingkong were the most tolerable. Dalprop and Emax have torn the Copter arms to pieces.

I hope the information is interesting for you and you understand that due to the wear and tear I will not carry out any further big test series regarding the biblades.

PS: Soon another build follows, again a Druckbär, but now 6s and auw <250g :-)

Nightprowler   Jul 27, 2019 

Short supplement (forgotten):
Dalprop T5047C 5.5g (triblade)

fovea   May 18, 2019  

nice build! do you try the dal t5051c?

Show 8 more comments
MattS   May 29, 2019 

I'm honestly kinda shocked those 1506 3400kv motors are swinging a heavy 5" prop on 4S. Very impressed with the overall build weight!! I'm interested in seeing video of this quad flying with heavy 5" triblades compared to a light weight 5" bi-blade (emax Avan or something similar). Great work!

Nightprowler   May 30, 2019 

thank you very much. At the Moment I‘m wating vor Avans after that I will try ty make some comparing video. But it will be just DVR, no HD 😉

fovea   May 30, 2019 

an hd video from these pure-ultralight would be a shame... ;-) very nice -awaiting for your dvr post..

Guides & Reviews

45 4,937  29
26 days ago

Want to learn how to build an FPV rig? This guide will walk you through your first FPV freestyle build. These parts were hand-picked to balance cost and maximize performance. The TBS Source One is a popular frame for it's low cost, high quality carbon fiber. It's easy to work with and provides more than enough space for your electronics. We've got a 32bit 4-in-1 ESC to bring you the smoothest flights..

Read more
40 5,185  30
Jul 30, 2019

You've probably heard the term "Cinewhoop". Traditionally it's a 3" ducted quad capable of carrying a GoPro Hero7 Black at a low 10 degree angle. More recently the term "Cine" has been applied to a number of RTF quads ranging from 85mm to 3". They all focus on their HD capability, but none compare to the stabilization of Hypersmooth (only available on the Hero7 Black). This is what really offers that..

Read more