Vippen 70mm EDF

[dberg97]

After the last FT Viggen had a spectacular demise, I decided I wanted a different EDF sport jet similar to the FMS Viper. I like the Viggen’s simplicity, so I used it as the base model sized up 125%. I combined many of the Viggen’s parts and modeled the control surfaces after the FMS Viper, hence the name, Vippen. I scratch built the main wing and horizontal stab FT master series style. The tip of the wing is 5 inches back from the air intakes and the motor is mounted 5 inches aft of the wing trailing edge. The motor is mounted forward of the FT marked lines identified on the template. Because of this I had to measure and cut custom formers for the motor mount. I was too cheap to go buy more tag board, so I ended up with a purple thrust tube. It’s powered by a 70 mm EDF and 6s. All up weight is 1745g with static thrust test coming in at 2700g. Length is 47” and wingspan is 48”. Wing loading calculated at 21.8 oz/ft2. Wish me luck with good weather and a safe maiden tomorrow.

 

[dberg97]

Video of the maiden. It’s fast and climbs vertically at less than half throttle. Stable at speed and agile.

 

[Jo's squadron]

plans?

 

[dberg97]

No. I scratch built the wing and horizontal stab Flite Test style using the dimensions from a picture of the Viper. I built the Viggen fuselage scaled up 125% according to the Flite Test plans. I traced and cut the wing recess in the fuselage and mounted the EDF according to my post above. The bottom of the plane normally covered by the original Viggen wing was custom cut after the new wing was installed. I highlighted other build considerations in my original post.