VStabi Pioneer of Flybarless

for quite some time I like to fly lightweight helis with low disc load. This matches very good with the new Logo 690SX. So I asked Mikado to get one of the very first kits before public release.

The assembly is almost the same as with a Logo 600, everything fits nicely without any rework. In some places additional extensions are mounted to get a nice size of the bird. These are landing gear stands and a battery tray extension.

These new parts are made of aluminum and are anodized black. A bottom cover closes the frame on the bottom end, and adds good visibility from this side. Some critical points of the mechanics have been beefed up, i.e. the tail belt, the freewheel hub and the pulleys which are made of aluminum.

Since I only fly ccw rotating systems, I remounted the hub to run in the opposite direction. Thats all I had to change to fit it for ccw rotation of the rotor. The hub is a bit higher than the one from the Logo 600, so it cannot simply be swapped as on the 600.

After the mechanics have been finished, the pleasant part of the built starts. This is the installation and adjustment of the VBar V6 with the VBar Control. Never before I was able to adjust a heli that quickly. Since the VBar Control already includes a preset for the 690, there was not much to do.

My power system is the stock Scorpion 4525 370 kv, which is driven by a 120A YGE and the vbar governor. Nothing special here, all fits nicely together. Power is delivered by new 12s Gens Ace 5000 packs with 45C. The battery weighs 1.5 kg, so the complete heli ends up at 4.7 kg, which is very good for such large packs.

The flight performance is really fantastic, very light on tic tocs, high agility and looots of power. The operational range of rpm is really big. You can easily drain the battery in 4:30, or fly for 25 minutes with the exact same setup. Of course everything in between is possible as well. A sweet spot shows up at 1,400/min to 1,600/min where everything for 3D training is possible, combined with plenty of flight time. Due to the wide range of operation, the capacity monitoring feature of VBar Control comes in handy, to keep track of the energy that is left in the battery.

The power system handles everything from low rpm to competition style flying with good efficiency. Even at very low PWM it barely gets warm, on the other side it can keep 1.800/min at full colletive without any headspeed drop. The ballance between power, efficeny and flight time is absolutely perfect.

Playing around with the parameters via VBar Control is really fun. Now I can get a much better fine adjustment as with the other setup options. It is not needed to adjust all the time of course, but since there is no need for any extra equipment, it can be done immediately, even if not prepared.

The Logo fits perfect into my Beamer Z4 trunk, so it has the potential to get my preferred heli for this season. I am sure you will have similar experiences.