MAIDEN FLIGHT
DETAILS
After the Viggen was released I wasted no time getting it built. I really enjoyed how stable it flew and was pleased with my first EDF. After a half dozen crashes I had to retire her and have been wanting to rebuild ever since. I have been on a roll lately building 80% FT planes so the Viggen is up next!
I had originally planned to use the 2700kv NTM motor but it was damaged in a crash so I have opted to use the 2200kv NTM instead.
PLANS
I have added the plans here.
SPECS
Motor 87g 700w 2200kv
Prop 7x6 APC
ESC 70a Dynam
Battery 2000mah 3S
AUW 595g
Speed 85mph
PICS
The plans fit on 2 sheets of DTFB, and that would include making 5+ noses as well.
The build went fast, a lot faster than the full size. I was able to get everything cut an assembled in just a few hours.
Weight with just servos is 151g - not bad at all.
80% next to my beat up full size.
Mounted powerpod
ESC is mounted in the duct for max airflow.
Plenty of room for my 2000 3S and TX.
Control rod is running through a straw and powerpod is mounted with two BBQ skewers.
AUW 595g.
REVIEW
Pros
- Very fast and stable at high speeds
- Tracks really well, no dipping or loss of altitude
- Very small
Cons
- Motor caused tremendous torque roll that is uncontrollable at low speeds
- Very unstable at low speeds due to weight
- Difficult to land due to instability at low speed
- ...basically you have to fly fast, always![Smile :) :)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
Comments
Boy is she fast! There are 5 other videos that I have not posted of my maiden of this plane. I didn't post them because they are all 4 seconds long and include the Viggen immediately death spiraling into the ground even when giving 0 control input. The torque roll is just that bad. I was very lucky to land each of these attempts on the belly so there was no damage sustained. Each throw I would adjust the angle to try and gain altitude right off the bat, the 5th attempt was the keeper and I actually got airborne.
I can't launch this bird without doing at least 1 roll from the motor torque. This makes take off very tricky and stressful. Once I got up to speed it does handle very well, though. A lot more stable than I had originally thought it would due to its compact size. If I bring the speed below 40% throttle it becomes unmanageable and doesn't respond to control inputs, it just kinda starts doing it's own thing. This makes landing tricky as I have to set it up perfect in a downward glide and set it down fast and hot otherwise a nasty crash will be inevitable. My maiden landing was awful as I hadn't realized how finicky it would be, but I was able to set her down okay.
All in all
Would I suggest you build an 80% Viggen? Yes, but don't use this motor. Get a lower KV and bigger prop that will give you more thrust. I have a few other motors I'm going to try and will update my review with the results. I am hoping a larger prop/more thrust will help to alleviate at least some of the bad tendencies.
DETAILS
After the Viggen was released I wasted no time getting it built. I really enjoyed how stable it flew and was pleased with my first EDF. After a half dozen crashes I had to retire her and have been wanting to rebuild ever since. I have been on a roll lately building 80% FT planes so the Viggen is up next!
I had originally planned to use the 2700kv NTM motor but it was damaged in a crash so I have opted to use the 2200kv NTM instead.
PLANS
I have added the plans here.
SPECS
Motor 87g 700w 2200kv
Prop 7x6 APC
ESC 70a Dynam
Battery 2000mah 3S
AUW 595g
Speed 85mph
PICS
The plans fit on 2 sheets of DTFB, and that would include making 5+ noses as well.
![photo 1 (8).JPG photo 1 (8).JPG](https://ftforumx2.s3.amazonaws.com/2014/06/70483_6cdffd2fb1c80aeb74804098a664ddfe_thumb.jpg)
The build went fast, a lot faster than the full size. I was able to get everything cut an assembled in just a few hours.
![photo 4 (3).JPG photo 4 (3).JPG](https://ftforumx2.s3.amazonaws.com/2014/06/70486_242f694d4b9bcc6457c1c4d4a2125c98_thumb.jpg)
Weight with just servos is 151g - not bad at all.
![photo 3 (5).JPG photo 3 (5).JPG](https://ftforumx2.s3.amazonaws.com/2014/06/70484_d1800bc5a90dcd61acfbc7c09c90da46_thumb.jpg)
80% next to my beat up full size.
![photo 5 (1).JPG photo 5 (1).JPG](https://ftforumx2.s3.amazonaws.com/2014/06/70487_148744506ef1fa747a7ad72e68c0c2c3_thumb.jpg)
Mounted powerpod
![photo 5.JPG photo 5.JPG](https://ftforumx2.s3.amazonaws.com/2014/06/70886_d953f12fad8e6cc3b175d21024069b91_thumb.jpg)
![photo 1 (1).JPG photo 1 (1).JPG](https://ftforumx2.s3.amazonaws.com/2014/06/70884_9ecf7a8a9e252cfcc718a34a04e1bdac_thumb.jpg)
ESC is mounted in the duct for max airflow.
![photo 2 (1).JPG photo 2 (1).JPG](https://ftforumx2.s3.amazonaws.com/2014/06/70889_daafff8a39c3143eb4555e40275e4ab4_thumb.jpg)
Plenty of room for my 2000 3S and TX.
![photo 4.JPG photo 4.JPG](https://ftforumx2.s3.amazonaws.com/2014/06/70887_80b9f10ee411e95a5dffab2f8b67371c_thumb.jpg)
Control rod is running through a straw and powerpod is mounted with two BBQ skewers.
![photo 3.JPG photo 3.JPG](https://ftforumx2.s3.amazonaws.com/2014/06/70888_9c4159dc73cf1f0cbdc054342c4312af_thumb.jpg)
AUW 595g.
![photo 2.JPG photo 2.JPG](https://ftforumx2.s3.amazonaws.com/2014/06/70883_7e2ebeff5b25fc8d002c8fd7c4ef6d79_thumb.jpg)
REVIEW
Pros
- Very fast and stable at high speeds
- Tracks really well, no dipping or loss of altitude
- Very small
Cons
- Motor caused tremendous torque roll that is uncontrollable at low speeds
- Very unstable at low speeds due to weight
- Difficult to land due to instability at low speed
- ...basically you have to fly fast, always
Comments
Boy is she fast! There are 5 other videos that I have not posted of my maiden of this plane. I didn't post them because they are all 4 seconds long and include the Viggen immediately death spiraling into the ground even when giving 0 control input. The torque roll is just that bad. I was very lucky to land each of these attempts on the belly so there was no damage sustained. Each throw I would adjust the angle to try and gain altitude right off the bat, the 5th attempt was the keeper and I actually got airborne.
I can't launch this bird without doing at least 1 roll from the motor torque. This makes take off very tricky and stressful. Once I got up to speed it does handle very well, though. A lot more stable than I had originally thought it would due to its compact size. If I bring the speed below 40% throttle it becomes unmanageable and doesn't respond to control inputs, it just kinda starts doing it's own thing. This makes landing tricky as I have to set it up perfect in a downward glide and set it down fast and hot otherwise a nasty crash will be inevitable. My maiden landing was awful as I hadn't realized how finicky it would be, but I was able to set her down okay.
All in all
Would I suggest you build an 80% Viggen? Yes, but don't use this motor. Get a lower KV and bigger prop that will give you more thrust. I have a few other motors I'm going to try and will update my review with the results. I am hoping a larger prop/more thrust will help to alleviate at least some of the bad tendencies.
Last edited: