Impulserc Micro Apex 4" HD Caddx Nebula Pro

By jasperfpv on Feb 05, 2021

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When i got the email of the latest frame release from Impulserc , I knew i couldn't resist it. I'm a fan of 4" and Micro Apex 4 looks a lot more proportional next to the 3" so the choice was easy.

It's a quality kit and a real step up from Micro Alien/Reverb which are super tight for build.

I went with Nebula Pro for slight weight and cost saving. As for the motors, i really wanted T Motors 2004 but there's no local stock and I'm too impatient so i got some HGLRC Aeolus 2004 as used by Dave_C Rekon Micro LR 5". They look pretty slick in green.

Dry weight 218g so no sub 250g here.

Here's the link to the impulserc official antenna mount file on Thingiverse.

https://www.thingiverse.com/thing:4732418

Had a few packs yesterday and it's a great flying quad with minimal tuning needed on stock BF 4.25

Photos

Part List

Frame	Micro Apex 4" Frame Kit (23 builds) Impulserc.com	$82.40
Flight Controller	20x20 Stacks / Flight Controllers / ESCs (110 builds) Racedayquads.com	$8.99
ESCs	Mamba F30 MINI 30A Blheli_S 2-5S DSHOT600 8 BIT Brushless ESC 20x20mm for RC Drone FPV Racing (7 builds) Banggood.com	$45.99
Motors	4 x HGLRC AEOLUS 2004 Brushless Motor (3000KV /1800KV/2600KV/3600KV) (4 builds) Hglrc.com	$71.96
Propellers	GemFan Hurricane 4023 3-Blade (30 builds) Airbladeuav.com	$2.99
FPV Camera	Caddx Nebula Pro 1/3 Cmos 2.1mm Lens FOV 150 Degree 720P/120fps Low Latency NTSC/PAL 4:3/16:9 Switchable HD Digital FPV Camera F (19 builds) Banggood.com	$55.99
Antenna	RUSHFPV Cherry 5.8GHz U.FL Lock Antenna 2 Pack - Red (RHCP orLHCP) (37 builds) Pyrodrone.com	$12.99
Radio	DJI Digital FPV Remote Controller - Mode 2 (61 builds) Racedayquads.com	$209.29
Goggles	(PRE-ORDER) DJI Digital FPV Goggles V2 - Ultra Low Latency 810p 144FPS Digital HD (294 builds) Racedayquads.com	$428.99

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Discussion

ojwright845 Apr 17, 2022

nice job man. have you upgraded to BF 4.3 on this one? reason for the ask - I'm just getting around to replacing the analog components with Vista and curious on your pids and filters. coincidentally mine is now identical to yours other than the FC stack (HGLRC on mine).

jasperfpv Apr 18, 2022

Thanks. I was still on BF 4.26 when I built and recorded the videos. 4S PID were on BF 4.2.6- Roll 46 .95. 40, pitch 50.100.46, Yaw 46 . 100.0
RPM filtering , Dshot 300, gyro filter reduced slightly.

I had updated most of my 5" to BF 4.3 so I will do the same to Micro Apex too and try it out.

ojwright845 Apr 18, 2022

thanks for the reply! I built mine analog when the frame first came out. at the time I was moving to digital and never really flew the micro apex (or tuned it). now I'm finally getting around to installing the caddx Vista and see how this thing performs. I am going to try your suggestion with BF 4.3 as soon as we get some better weather up here in the Northeast.

YanikS Mar 22, 2021

How loud is the drone? Also i'm thinking on going with 1404, 1505, 1606 or 1408 motor (inspired by babyhawk hd 1404, maybe also run 3.5inch props) you think that would work well enough?

jasperfpv Mar 22, 2021

It is not as quiet as Toothpick and it will scream with heavy throttle but still a few notches down from 5" with GoPro noise. 1606 or 1408 should have plenty of power for 4" or 3.5" props.

ICARU5 Feb 24, 2021

Thanks for the link to the impulserc official antenna mount file.

nickbusscher Feb 05, 2021

Sweet build man, looking to do something similar! Do you think there is a way to get it under 250 grams with the vista? Perhaps lighter motors (though these seem pretty light already), ditching the protector and using an AIO FC/ESC board, but not sure if that will cut down the weight enough.

jasperfpv Feb 05, 2021

i think it will be really hard to get under 250g AUW for HD unless you go for much lighter motors, decase the Vista unit, rid of arm skids, wire protector, avoid heavier battery pad and use 450mah 4s.