oh i see i am thinking like 4S with 1108 motors maybe the frame is a bit too small

Hang on...

Edit to add : 60 mins and DING, its ready!!

Frame with 4 x m2 motor mounting spaced on a 9mm diameter. Beefed up the arm width by 2mm as well as increasing the size of the motor protector part of the arm ends. Thinking of the additional weight of a 4s battery and 1108 motors, I thought I would sling some grisha struts together for this one too!

With a 1.5mm CF chassis with 1mm supports. Calculations come in at just under 6g for the chassis and 0.7g per strut, + 1.1g for the top plate making total  weight of CF just under 8.6g.
With the 2mm CF chassis @ just under 8g and the struts cut from 1.5mm CF are almost exactly 1g each. + 1.1g top plate = 11.1g

(28-Mar-2018, 01:21 AM)Oscar Wrote: oh i see i am thinking like 4S with 1108 motors maybe the frame is a bit too small

Just been looking, I reckon that your probably better off with 3S, if your looking at the RcInPower G1108 6800kV, (EngineerX thrust results showing up to 450g thrust on 2535x4 props @ 16A draw. 

Just editing to account for this (8.6 gram) 20x20mm mount  HGLRC F4 15A ESC BLHeli_S AIO stack with 25-300mW VTX... (25A peak current, 13A peak on 4S)

Specially for you Oscar brother! What do you think?

Aaaand Sketchup just crashed, all gone ARRHG!!

Ok, I thought rather than making adjustments to a different design, rather designt specific to a task. So I started again pretty much from the ground up, here is a quick vid showing off my newest design.

I was thinking of calling this one "O God" after the jokes in the 'Who is Oscar anyway!' thread,. What do you think now..?

Sorry no sound on this one either!

i don't know, i still prefer standoff's and horizontal plates... just seem to be more durable in my experience and easier to build.

---

And thank you for putting my name on the frame LOL what an honour!

That is like such a cool frame! It would be awesome to have a laser bed or hydro cutter to be able to make them easily! Custom monogrammed frames!

As requested, 3 standoffs, flat top plate for top mounted battery and a 3d printed "floss" style mount, ( I will have to give you .SKP or .DXF file, every time I try to export to .STI using a Sketchup plugin, it throws an error). 


Does it look close enough for you to recognize the dragon from your logo?

Thats is slick as &*#@!!!

Ok slightly updated... 


Changed standoffs to 25mm, to give a bit more room for the camera, also made the cam mount smaller and moved it back to add prop clearance and shorten the arms, it was about 138mm wheelbase, I have managed to get it down to exactly 130mm 'true X'. Fiddled a bit with the top plate to get it looking closer to the blogs logo, and also give better proection. Shaved some edges on the frame and lined up the bumper to better protect the camera too. 


I'm not sure, but if you were to use the the HGLRC (20x20 mount) AIO F4 FC with integrated 15A ESC, it might fit a split mini into the stack, but  I would probably have to revert to the ~138mm wheelbase. The cam mount might need to be extended forwards for the longer back of the split, which would mean the arms would need to be longer to provide clearance for the props.


Oscar, I don't know if you have decided on the stack you want to use, I have been designing round the AIO HGLRC, which is pretty massive for a 20x20mm mount - 32 x 35mm including pads, I could probably shave some weight off the frame (and some mm the wheelbase too) if you are using a separate 4-in-1 ESC?


So I have calculated the weight of this with either a 2mm or 3mm chassis and an either 1mm or 1.5mm top plate - 

Working on 0.00124 grams per cubic mm for TPU and 0.0016239 grams per cubic mm for the CF. 

TPU Cam mount 0.45g each (0.9g for both)
Alu standoffs I have seen ~0.3g per 10mm - 3 x 25mm = 75mm x 0.3g = ~2.5g
2mm Chassis @ 13g
1mm Top Plate @ 2.5

Making the lightweight option 18.9g

3mm Chassis @ 19.5g
1.5mm top plate @ 3.8

And the heavyweight almost 8g heavier @ 26.7g


Also working on product info I get -
RCInPower 1108 motors @ 7g each (28g total)
HGLRC AIO F4 FC & ESC @ 6.8g
Caddx turbo micro SDR1 @ 5.5
RunCam TX200 VTX (or similar mount to the back of the 19x19mm cam) @ 3g

= 43.3g

plus ~ 10g for RX, wires and antenna

Total = ~ 50 - 55g for hardware

Plus a 550mAh 3S @ between 45 - 65 grams

Gives us an expected AUW of between 120 and 140 grams...

Given EngineerX thrust test review of these 1108's producing 450g static thrust on 3S with a 2.5" prop we are looking at a (static) thrust to weight ratio between 12.5 and 15:1... Is it just me or are these figures INSANE!!??

Just noticed the Banggood stats showing the 6800kv version of these motors producing more thrust with a 3 inch prop on 2S than the 3 inch prop on 3S with the 4000kV version!?

OH MY GOD! That is SICK!

You are a genius Tom! haha
I have another suggestion, maybe add an extra top plate with a "standard" design that don't have all the pointy ends? It could act as an replacement plate, as well as an option where people might prefer a "smoother" feel and avoid possibly having the pointy part in the camera's view if up-tilt is high?  of course this is not necessary, the current design is so damn good already

Yea I think I would rather raise the stack height than making the frame wider. But for the 130mm version, you are designing it just for 2.5" props? I saw this 130mm design and it supports 3" prop somehow... is that because it has a longer body?

(07-Apr-2018, 01:28 PM)Oscar Wrote: OH MY GOD! That is SICK!

You are a genius Tom! haha

From you Oscar, that is high praise indeed, thank you! *bows*

(07-Apr-2018, 01:28 PM)Oscar Wrote: I have another suggestion, maybe add an extra top plate with a "standard" design that don't have all the pointy ends? It could act as an replacement plate, as well as an option where people might prefer a "smoother" feel and avoid possibly having the pointy part in the camera's view if up-tilt is high? 

I know you are a safety conscious guy which is why I rounded the end of the horns originally! 
If anyone is worried by a few pointy bits, they shouldn't be flying a dragon with a thrust to weight ratio of 15:1   !!!

But I have made another top plate option, what do you think? -


Whoops, I updated a bit from this, check the side by side image below!!

I also redesigned the camera mount, it now has 3 x M2 holes for you to mount your camera at different heights, the holes are spaced 4mm apart and the mount itself has about 3mm of movement on a 25mm standoff so you can get the perfect height for your FPV Cam and angle. 

I have shaved a couple of mm off, and moved the horns outwards sightly, so that there will be no part in view, even with an FOV of 140 degrees. 

(07-Apr-2018, 01:28 PM)Oscar Wrote: Yea I think I would rather raise the stack height than making the frame wider. But for the 130mm version, you are designing it just for 2.5" props? I saw this 130mm design and it supports 3" prop somehow... is that because it has a longer body?

Yeah, that 37mm long FC with all the solder pads on every side, has made the body quite a bit longer, to allow space for the wiring between the board and the standoffs. I have played about a bit, using a stack footprint of 32x32mm such as the HGLRC F428 AIO ESC has. I have managed to bring the front standoffs and camera closer to the center to allow for shorter arms, wheelbase now 124mm.