ELF X88 A.K.A the tiny b@st@rd!!

By DPJ on Nov 11, 2018

9  460  7

I decide to try a 2 Inch build, what I didn't realise, was how much of a pain in the arse it would be! If it could go wrong, it went horribly wrong.

I ordered parts over the span of a few week, money and time allowing. The frame arrived okay, and the first thing I did was lop off the ears/battery tabs from the side. Partly because they looked awful, and partly because they weren't of any use to me.

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Other bits started arriving in drips and drabs, motors first. Racerstar 1103, 8000kv in Punk Pink (an in joke with a friend).

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Then the Eachine Minicube F3 Flight Controller/ESC/Receiver all in one tower. Slight issue with the one that arrived, Banggood sent the wrong R/X. I needed FlySky, they sent FrSky.

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So I ordered a second R/X, the Fli14 Mini R/X. At the same time, I got a VTX/Camera all in one, the Eachine TX05.

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First thing to do was test fit and solder all the parts needed. This included measuring up the motor wires to the frame. These were a nightmare to work with. The conductor is a single strand of copper and the insulator is cheap plastic. This made stripping back a pain and then soldering them to the ESC even worse. I persevered and got it all sorted, with a small amount of swearing and some seriously burned finger tips.

At the same time I messed around with the stack height using M2 Nylon Hardware. This would be a theme of this build, test height, realise it's too short/long, alter, test again etc etc etc...........

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Once the ESC was at a height I was happy with, I mounted up the FC.

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The added a Cap to the battery lead to help with VTX noise. I used the same method on my Frog Build. Simply slice back some insulator, poke the Cap wires into the exposed conductor, then add a small amount of solder. It was a little fiddly on an XT30 Cable, but it worked well.

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Then protect with some Heat Shrink and insulating tape.

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While I waited on my replacement R/X, I messed around with VTX/Camera fitment. Using small hair band/elastic bands from my wife, I put one around the front standoffs, running round the back of the camera. Then one around the antenna, and around the rear standoffs.

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Once my R/X arrived, this was stuck in place using double sided foam tape.

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Then the final bits were carried out. Camera put back in, top attached correctly, and buzzer strapped to the top plate with a small zip tie.

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Finally a couple of shots of how it all looks completed. I've bound the R/X to my T/X, and once my batteries turn up, i'll go through the Betaflight and BL_Heli S setup.

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Oh, and I dithced the elastic bands for a battery holder idea after finding a velcro style strap that attaches to itself. This should suffice for the 2s Batteries I plan on using. If there are any issues, i'll use a bit of velcro on the baseplate and packs.

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Photos

Discussion

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Shawn53   Dec 21, 2018  
1

gotta love your determination. At least it looks good. Hope you figure it out.

DPJ   Dec 22, 2018 

Thanks man, I got there in the end. We've had no decent weather though, so i've done a few little test hovers in the loung the cats aren't too impressed hahaha Hoping for a couple of dry days over Xmas to go and rip some packs.
It has changed slightly since this build, i've made it into a top mount battery version.

Shawn53   Dec 22, 2018 
1

btw....i like the way you added the capacitor on the power cable. Originally i was not going to add one due to space but after seeing yours, I plan to do the same on my 3".

DPJ   Dec 23, 2018 

I saw it somwhere on here and looked into it a little. It's a really simple way of doing things, and seems to work well.

DPJ   Nov 13, 2018  

Another update for anyone looking. This thing has fought me all the way, and tonight it decided it's going to try and smack me square in the balls yet again. Firstly, when I plug in a pack, it won't fire up unless I unplug the camera. Tested anothe camera and a VTX unit, and it seems there's a possible issue with the connector plug attached to the FC. Secondly, I flashed the newest Firmware through Betaflight, but when I connect to BL_Heli32 it won't recognise anything. It will connect, but then says the ESC is unknown, so won't allow me to write to the board when I try to reverse the motors. I'm at the point now where i'm thinking chuck the crappy Eachine stack, and start from fresh.

Sasquads   Nov 11, 2018  
1

So, how does it fly?

DPJ   Nov 11, 2018 

Not had chance to test it yet bud. Batteries and props are on order, hopefully they'll arrive tomorrow as we've got good weather forecast this week, then I can put it through it's paces.

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