DIY $80 50mm EDF Jet: Grunjet

by grifflyer | February 26, 2018 | (7) Posted in Projects


Hi all, 

Here is an easy to build, cheap, and fun to fly 50mm EDF jet named, the Grunjet. 

(flights on 4s)




(flight on 3s)



About the Grunjet:

This Plane is a 50mm EDF Sport jet that was designed to introduce people to jets without many of the bad characteristics that you typically get when you build/purchase a Ducted fan type aircraft. To begin with, it's quite inexpensive.When made from the ground up, It will cost you less than 80$ ready to fly. Minus your Radio and Transmitter. It has tons of power, unlike many jets out there, giving you the ability to do near endless vertical, and take off from the ground...without landing gear! The Grunjet also features large ailerons letting you pull off some very fast rolls, and giving you plenty of control at lower speeds.

Gallery:

Parts list:

  • FMS 50mm 11 blade EDF
  • 3s 1800mah 50c min. or 4s 1300mah 40c min.
  • 40 amp esc
  • Three 9g servoes
  • 2 sheets of foam
  • Rx Tx combo

Plans:

Grunjet plans sheet 1
Grunjet plans sheet 2
Decals

Specs:

  • Wingspan: 29.5 in. (750 mm)
  • Length: 30 in. (762 mm)
  • Center of Gravity: 5 in. (127 mm) from leading edge of the wing
  • Control Surface Throws: Low - 15˚ deflection|High - 24˚ deflection
  • Weight without battery: 10.8 oz. (306 grams)
  • All up weight: 16 oz. (453 grams)

 



COMMENTS

AeroErgo on February 28, 2018
That´s a very nice Jet for EDF begginers!! Congratulations! Remember me the Heinkel 162 Salamander :)

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grifflyer on March 21, 2018
Glad you like it!
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Air-headed Aviator on March 20, 2018
This looks really good! I love the look of it especially.
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grifflyer on March 21, 2018
Thanks!
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andrewpuzanov on October 7, 2019
here is my version

https://www.youtube.com/watch?v=V01xh6Dtvj8
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grifflyer on October 7, 2019
I just watched the video, I love the paint scheme and how you did the landing gear, Excellent work!! How are you enjoying the plane so far?
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andrewpuzanov on October 7, 2019
Thanks. It flies really good. I have deeply reworked the project so I had no idea whether it would fly at all. Fortunately I had only to stick a coin on the tail after the maiden flight and a bit of trimming. The second flight was already perfect.
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winglet on December 4, 2020
Just put the first 7 flights on my V tail version. I really enjoyed building this and it flies really great with my 50mm FMS EDF on 4S. Really a well though out design. Thank you for posting the plans. I'm starting a second one tonight only because I enjoyed building the first one so much. The first one is bone stock. No mods. Doesn't need any.
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Matthew Novoselskiy on January 31, 2021
its really nice, I have one question though, how do make it, i know there are plans which i downloaded and viewed, but they are to big to print, how do i get it to work? thanks!
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grifflyer on February 5, 2021
Hey sorry for the late reply,
What you can do is open up the plans in Adobe Reader and select print. After the print window opens up there should be a section in the middle of the window labeled "Page Sizing & Handling" right below that there should be options to choose between "Size" "Poster" "Multiple" and "Booklet" You are going to want to select the "Poster" option. Next, ensure your tile scale is set to 100%, your overlap is set at 0.005 in. and that you have the "Tile only large pages" option selected. You can also select "Cut marks" which will make taping the sheets of paper together easier, but it will increase your page count from 8 to 12. Lastly, go down to the bottom of the print window and click print.
Note: If you do not have the poster option on your laptop you may need to upgrade to the latest version of Adobe Reader. It may even be old enough that looking in the program options for updates does not work. You will have to go to Adobe website to get new version
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DIY $80 50mm EDF Jet: Grunjet