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Author Topic: E-flite Opterra Build "edit"  (Read 586 times)

Njoro

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E-flite Opterra Build "edit"
« on: September 23, 2017, 03:20:04 PM »

So the Opterra is more or less finished, this wing has been a joy to work with, the foam mold is of excellent quality and very precise for measurements. Iíve never worked with a model with so many compartments for mounting of avionics; I have however had models with just cavernous space which can be a pain in reality.   

Why the Opterra? Well, I just wanted something a bit different that will challenge my 3D drawing and printing, also I wanted to try the TBS Crossfire which really was the starting point for this venture. I also had a motor and ESC sitting around the workshop asking for a ďcribĒ to live in.
The wing arrived three days after my order, it was well packed and I had it dry assembled within five minutes of unboxing it, and the first ideas of what and how Iíll be building it formed in my mind.

I had to leave the wing for a bit because of work commitments, but Iíd watched YouTube videos of this wing and I was impressed with how well it flew in capable hands. The one thing I gathered from the videos was that some people found the wing a bit underpowered, but I think I have the solution sitting in my workshop.

The build started with a dry positioning of all the bits and bobs with CG driving where the said items will sit especially the autopilot which is most effective if on or as close to the CG as possible.

The Build Plan:
1)   Design and print parts which are easy to remove or move for maintenance or redesign work.
2)   Rework the motor bay to accommodate the Pualso 2826/12 motor and Pualso ESC.
3)   Get a spare set of wings to enable the use of 5G8 and 2G4 depending on location.

Parts used:
1)   RVOSD Gen6 removed from my banana skywalker.
2)   Pualso 2826/12 790Kv.
3)   11Ēx 7Ē carbon folding prop.
4)   Pualso 40A Opto ESC.
5)   GoPro 3.
6)   Camera 800TVL CCD 5V.
7)   Mobius.
8)   3-way camera switch.
9)   TBS Crossfire diversity.
10)   Hobbywing BEC
11)   Avionics Battery 3.6Ah 7.4V 12C.
12)   Flight Battery 5Ah 14.8 45C-90C or better
13)   Vtx 2G4 and 5G8.

Iím hard-pressed to find anything negative about this wing, itís clear that E-flite design team are a very capable team. Iím most impressed with the quality of the vortex generators, they are not just blobs on the wing but rather they are wedge-shaped and look functional and the videos on YouTube confirm this. This flying wing in my view has raised the bar for ARF and FPV aircraft; I canít wait to fly it.
The only niggle was the hugely out of balance plastic prop hub and spinner but thatís a given for plastic molds anyway.

The Build:

Due to the excellent internal design of the wing I had no complicated parts to design and 3D print, this has meant that while off work taking a break over the last seven days Iíve completed the build.
 









« Last Edit: October 13, 2017, 09:54:08 AM by Njoro »
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Njoro

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Re: E-flite Opterra Build "edit"
« Reply #1 on: October 02, 2017, 07:12:54 PM »

Some pictures.

















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iwan_canobi

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Re: E-flite Opterra Build "edit"
« Reply #2 on: October 02, 2017, 11:04:01 PM »

Looks like some intricate 3D parts, nice work. Could you share the camera mount?
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Njoro

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Re: E-flite Opterra Build "edit"
« Reply #3 on: October 03, 2017, 09:05:36 AM »

Could you share the camera mount?

Yes, but the camera housing it's self will not fit around the fatshark CMOS although they look the same size. If your camera will fit these dimensions just let me know. 



The mount is built around the Turnigy 180 degree servo with the base plate set at 10~ degrees of down tilt.



« Last Edit: October 03, 2017, 09:40:38 AM by Njoro »
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iwan_canobi

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Re: E-flite Opterra Build "edit"
« Reply #4 on: October 03, 2017, 10:20:31 AM »

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Njoro

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Re: E-flite Opterra Build "edit"
« Reply #5 on: October 03, 2017, 12:43:58 PM »

Could you measure it? if it's ~ 17 mm/sq  then it will fit otherwise I'll have to re-dimension it. I just had a look at the link and it looks like it will fit, I'll print you one if you cover the postage.
« Last Edit: October 03, 2017, 12:50:20 PM by Njoro »
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iwan_canobi

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Re: E-flite Opterra Build "edit"
« Reply #6 on: October 03, 2017, 12:47:07 PM »

According to the site its 18mm wide x 17.5mm tall.

Don't worry about it though, it just looked like it was the same unit. I'll knock something up, it's just a fixed mount I need rather than to go on a pan servo.
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Njoro

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Re: E-flite Opterra Build "edit"
« Reply #7 on: October 03, 2017, 12:53:15 PM »

According to the site its 18mm wide x 17.5mm tall.

Don't worry about it though, it just looked like it was the same unit. I'll knock something up, it's just a fixed mount I need rather than to go on a pan servo.

Oh Ok  :)
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Coyote

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Re: E-flite Opterra Build "edit"
« Reply #8 on: October 03, 2017, 08:30:56 PM »

I like the 3d effort that's gone 8nto this build :)
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Njoro

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Re: E-flite Opterra Build "edit"
« Reply #9 on: October 04, 2017, 09:39:35 AM »

I like the 3d effort that's gone 8nto this build :)

Thanks Ian, I'm just loving design and 3D printing; I'm getting the same joy I got from my first Meccano set when I was 6 years old  ;D
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Njoro

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Re: E-flite Opterra Build "edit"
« Reply #10 on: October 04, 2017, 11:30:57 PM »

Just added the counterbalance weights to the wing tip, it needs 35g of lead.



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Njoro

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Re: E-flite Opterra Build "edit"
« Reply #11 on: October 12, 2017, 12:59:46 PM »

Having decided to change the motor I ended up ditching the E-flite Prop and Hub as well, the E-flight hub did not allow the carbon 13x7 prop to deploy fully due to the difference in the prop root; so I bought an alloy hub from E-bay. The new hub needed a front and backstop for pusher configuration; I couldnít find one so I made one.

The alloy mount has no backstop, so the prop will overextend and will catch on the motor housing so time for 3D printed solution.

This design is driven by the following criteria; Simple design, material, and Aerodynamics.

Simple design:
 






 
Aerodynamics:
   1, itís Critical that the blades fly in the same rotational plane when pushing, and are dynamically balanced.
 

  2, the blades fold back but not too far back that they cross over each other which can be disastrous when you fire up the motor in flight.

 
 Material Choice Plastics:
  1, PLA
  2, ABS
Experimental Material used is PLA:  100% rectilinear

Other images










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Njoro

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Re: E-flite Opterra Build "edit"
« Reply #12 on: October 13, 2017, 02:07:53 AM »

Since the spinner is so out of balance, I'll print one to see how balanced it will be.







The original spinner

« Last Edit: October 13, 2017, 02:12:00 AM by Njoro »
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iwan_canobi

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Re: E-flite Opterra Build "edit"
« Reply #13 on: October 13, 2017, 11:37:18 AM »

Looks good! Will be interested to see how the layers hold up when being spun at high RPM. Also will be interested to see how well balanced the spinner is, in theory it should be pretty accurate!
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Njoro

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Re: E-flite Opterra Build "edit"
« Reply #14 on: October 13, 2017, 11:50:57 AM »

Looks good! Will be interested to see how the layers hold up when being spun at high RPM. Also will be interested to see how well balanced the spinner is, in theory it should be pretty accurate!

It's printing right now it's at 59%, printing at 100% infill; it's looking good but as you say the spin test will prove it  :laugh:

I'll be wearing protective goggles, I wonder if I can brush a thin coat of thin cyno without unbalancing the spinner.

 I think an experiment is in order here  :sparta:
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