The JA-37 Viggen Scratch build

After many, many hours of building my latest creation is finally alive!

Based on the design of Johan Hansson’s (original build article HERE!.) It’s made from 4″ thick bluecor foam, which I hotwire cut by hand

Powered by a 10 blade ChangeSun 70mm fan it is a rocket in the air

Check out the video where Josh and Josh review and fly it:


Here is a link to the complete build log of the Viggen, along with plans fo the formers:

To simonk, or not to simonk?

I’m trying to copy David’s V.2.5 tricopter. This is my first tricopter. HobbyKing did not have the exact model of ESC, so I substituted with the Mystery 30A BEC Brushless Speed Controller (Blue Series). I reflashed all of them with the simonk firmware. I bought the HobbyKing Multi-Rotor Control Board V3.0 (Atmega328 PA) and used the latest kkmulticopter flashtool to put Minsoo Kim’s XXcontrol_KR_TriCopter v2.9 on the control board.

I completed my tricopter and I tried running it up last night and it was extremely jumpy and not controllable at all. I moved the gains back and forth with no change in behavior. I missed the step of balancing the props/motors (I’m using the orange GWS props), so I hope that is the cause of my problem, but it has made me question my choice of putting the simonk firmware on my ESCs.

I’ve been blindly following all the tutorials/tips I can find without fully understanding the reasons behind them. What does the simonk firmware give us? Should I even be using it? I noticed that David did not reflash the ESCs on his V2.5, but he has commented on reflashing them before (V2), but he has never specifically called out the magic “simonk” firmware like others have. My understanding is that the new firmware offers greater precision and responsiveness compared to the stock firmware, but is that true? Do I HAVE to reflash in order to use a KK Board?



How to control a rc helicopter

Nowdays people are organizing parties, most are always at their wits end as they try to ensure that there are enough fun activities for the guests to engage in. Remote control helicopters can be an excellent source of entertainment at parties and other events. The guests at the party can get to watch, a highly advanced remote control pilot, perform impressive air tricks with the remote control helicopters. The person, who will be navigating the remote control helicopter, should be able to do so without injuring those who will be watching the rc helicopter.

Admittedly, navigating the remote control helicopters is not an easy task. It takes hours or even days of practice how effectively to maneuver the RC helicopter. While a navigator is still practicing how to pilot The RC helicopter, it is best that the person only fly the helicopter in a wide and open field. This is a precautionary measure against possible accidents, especially if the person is training in the house or a crammed back yard. Once the person has mastered how to navigate the remote control helicopter, then the person can go ahead and fly it in the house. The recent model of the electric remote control helicopter is best for in the house flying, because it is small enough to be maneuvered around.

While the simpler tricks can easily be mastered within the first few days of using the remote control helicopters, the advanced maneuvering tricks can take months and maybe even years to master. Therefore, before performing this tricks, that the pilot ensures that he or she is well adapted to executing them.
There are six steps generally.
1.Charge the helicopter completely. The Havoc attaches with a wire to the remote control and charges from there. A full charge ensures that you will get the most flight time out of your Heli before having to come in and land.
2.Place the controller in your left hand in position as if you were holding the controller with both hands.
3.Place the Havoc Heli in your right palm and ensure there is ample free space above your hand.
4.Gently press up on the left thumb stick. This stick will control the lift of your helicopter while you are flying. It is important to gently increase the strength of this lift to ensure that the helicopter does not spin out control.
5.Straighten out the helicopter using the L or R button. Often at take off the helicopter will be spinning to the left or to the right, and these buttons are used to straighten it out before using the turning thumb stick. Press the button opposite the direction the nose is turning, and repeat as needed until the helicopter is hovering in place with no spin.
6.Use the right thumb stick to control the turns of the helicopter, and the left thumb stick to move the helicopter forward and up or down, with more pressure on the left stick causing the helicopter to travel higher and faster, and less causing it to slow down and lower.