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500mm Scratch Built EDF35 Wing

Old 11-17-2020, 03:02 AM
  #1  
VAALLEON
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Default 500mm Scratch Built EDF35 Wing

Hello All, I am new to wings. So, I wanted to build a trainer for myself to learn how to build and fly wings. Here is what I got:

-500mm wingspan
-I used foamboard with balsa reinforcements.
-I used a 35mm EDF (I have so many EDFs laying around, that's why...)
-Radiolink radio
-cc3d for stabilization

I am testing with different capacity batteries to get an understanding of the optimum setup and flight times. Below are some of the results:

Weight MAH Flight Time
123g 400 +6min
136g 500 +7min
143g 800 +9min
169g 1000 to be tested

I am pretty sure I will be +10min with 1000MAH but we will see after the test. I believe these are pretty decent flight times but would probably better with a prop?

It's really easy and fun to fly and glides beautifully. Here is a video of a slow and low flight with nive close-ups.

Thanks

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Old 11-18-2020, 02:11 AM
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Last test with 1000MAH was done today. Quite a windy day, so its fun to watch the unit continuously correct against wind.

This flight pointed to +11m flight time with 1000MAH setup. Pretty decent for a tiny EDF unit.

Weight MAH Flight Time
123g 400 +6min
136g 500 +7min
143g 800 +9min
169g 1000 +11min



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Old 11-18-2020, 11:14 AM
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Don Sims
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Another cool project Va. It's impressive how you've evolved the designs and improved flight capabilities over the years.
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Old 11-18-2020, 08:43 PM
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Thank you sir! Leaning more towards having a little more fun and learn the wings recently...
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Old 11-20-2020, 01:31 AM
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Keeping on practicing, tuning. Punched it a little more this time. Really easy to fly and pretty fast. will start FPV practices when I feel comfortable enough.

Installed a tiny cam



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Old 11-22-2020, 04:09 AM
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Improving the unit to make it more reliable.

- R6DS radio was cutting off from time to time, even in close distance. So, replaced that with R12DSM which claim to have 4km air range.
- 25mw Eachine FPV cam was cutting off frequently. Now replaced with a 200mw Eachine FPV cam.

Short flight to test the new hardware. Turned out to be pretty good and I felt much more confident with the new setup. I can stay practicing FPV tomorrow


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Old 11-24-2020, 03:45 AM
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The first practice. Standing at a higher point in the park to make sure I don't lose the signal. There is a little flickering when the unit reached the far side of the park but most likely due to the trees and other structures between us. So far so good!

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Old 12-20-2020, 04:51 AM
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At last I was able to do my first inav FPV flight with my tiny EDF wing. The OSD is awesome. Inav has come a long way from Multiwii days that we had to use FTDI boards to flash and I2C boards for GPS I switched over to cruise and pos hold for very short periods just to make sure they are functional. RTH and failsafe are also set and ready to test. And yes I currently fly in angle mode as I am new to the wings...
-Foamboard 500mm wingspan, 35mm edf, 20a esc, 1000mah 2s lipo, rd12ds RX, Foxeer micro FPV cam, OP GPS, Eachine 200mw VTX, fatshark goggles with eachine DVR... All parts except the RX and Lipo were laying around from older projects and this wing costed me pretty much nothing. Great trainer and so much fun...

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Old 12-23-2020, 02:48 AM
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Latest flight

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Old 07-10-2021, 05:18 PM
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I have tested many different designs and setups after the initial tests and I came up with what I believe to be the best that I can do with my skills and experience.

This unit can almost be parked in the air against some headwind with a 1000mah Lipo. You can get upto 15min flight time with a Liion pack. It has onboard HD DVR with TBS Crossfire long range receiver and 400mw Panda VTX with INAV autopilot and Matek FC. really solid FPV unit.

I put all STL and pic files (MonoWing 3D V2) on my web page that I am slowly building, along with videos. So, help yourself if you would want to build one.

https://monophan.com/free-stl-pic-files/

Thank you!
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Old 07-11-2021, 10:28 AM
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That is a truly remarkable achievement but with all that 'stuff' just stuck on top of the wing its aerodynamics are hardly at the same level of sophistication as the electronics.
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Old 07-11-2021, 03:49 PM
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Originally Posted by quorneng View Post
That is a truly remarkable achievement but with all that 'stuff' just stuck on top of the wing its aerodynamics are hardly at the same level of sophistication as the electronics.
Thanks! I kind of understand your concern but don't totally agree with you. I think you should click on the link and see the latest V2 design.
Obviously the aerodynamics will not be as sophisticated as a factory made foamy (not comparing to 3d prints because weight makes that impossible for my setup, have tried it). However, most of the aerodynamical requirements have been met. 1- You need a very slim wing design with a sharp attack edge for EDF models, as you need the speed for better efficiency. This design, although very simple, provides that. 5mm foamboard with very light 3d printed attack edge did the job, 2- All electronics except the GPS is pretty much lined up for a small area of resistance against the airflow. In some of the previous models I split them into two on two sides to keep the EDF intake open for fresh air, but this design didn't need that. So the drag from all those electronics is as small as it can get. 3- Even though all of those electronics are pretty small the weight adds up. And, that's why it took me many times to get it right with all the bells and whistles, to find the right balance between the strength and weight, foam and 3d print.
Thanks for the feedback.
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Old 07-11-2021, 03:52 PM
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Originally Posted by quorneng View Post
That is a truly remarkable achievement but with all that 'stuff' just stuck on top of the wing its aerodynamics are hardly at the same level of sophistication as the electronics.
I think you should click on the link and see the latest V2 design. The videos on this tread belong to the fist prototype which actually was exactly how you explained. See pics attached.

https://monophan.com/free-stl-pic-files/

https://youtu.be/G_pOpxg1kUA
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Old 07-12-2021, 12:12 PM
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The V2 is obviously a significant improvement. If speed is important then it would help if the servo wires were not 'free' directly in the airflow. Much better to tape them down. The airflow close to the board surface will be much lower so creating less drag.
I appreciate the front the video camera present a bluff shape but an aerodynamic fairing at the rear would reduce drag and perhaps more important would reduce disturbed air into the EDF. EDFs are quite sensitive to inlet air disturbances
Is there any reason why the servos could not be buried, even if only partly, into the board to reduce drag? It all helps.
A fully buried elevon servo on home built foam EDF delta.
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In this case the servo is as thick as the wing. It is completely glued in so has to be physically cut out if it needs replacing, which it hasn't even after 5 years.
Finally a thick trailing edge whilst not impeding control does create a bit more drag over a 'fine' one. I am not sure how easy it would be to 'thin' the board down in some way towards the trailing edge.

Please note these are not intended to be criticisms but just comments on areas that I have found that can make an improvement to the performance of foam planes that I have built.

Last edited by quorneng; 07-12-2021 at 12:35 PM.
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Old 11-19-2021, 10:06 AM
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Old 11-23-2021, 09:26 PM
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ddlawrence
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That little wing made from flat panels and the little EDF can carry all those electronics?
I did FPV 12 years ago. It was exciting, but not easy.
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Old 11-27-2021, 02:44 AM
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Yessir, it sure can. and for 15 minutes
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Old 11-28-2021, 09:14 AM
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What is the max range of your FPV h/w?
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Old 11-28-2021, 03:43 PM
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400mw panda VTX. probably a couple of miles. latest version is on this link for anyone interested.

https://www.etsy.com/MonoPhan/listin...=1638110506568
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Old 11-29-2021, 08:30 AM
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Wow that is tiny. What is the all-up weight of the system (camera, transmitter, antenna, gps etc...)?

Also, what about interference with the RC-receiver at high transmit power?
Does that affect the range?
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