Category Archives: electric

Yoshioka Bingo.F3A


The Yoshioka Bingo.F3A is done, and it has been a journey. I bought the kit from Ishii Mokei several years ago and have built it in stages, enjoying it a lot. The Bingo.2M is originally a 3D plane for YS engines with oversized control surfaces. Mine is the first F3A-variant called Bingo.F3A with normal ailerons and elevators. I ended up buying a new wing for it, the “Pro” version which has is fully sheeted, features more taper and flaps. So mine has ended up a hybrid. The current version being sold by Yoshioka has support for electric motors, angled stabilizers, smaller flaps and other minor modifications.

The finished weight is 3,85 kg without batteries. I’m using Hacker EcoX F3A 4600 batteries that weigh 900 grams, for a flying weight of just over 4,8 kg. That’s not bad considering it has a clear plastic cockpit and a pilot on board, and 7 full-sized servos! I could have made 4,5 kg if I had used a  smaller RX battery, eliminated the flaps and pilot, smaller servos, used a carbon prop etc. The kit is extremely lightweight.

Equipment used:

  • Plettenberg 30-9 motor
  • 19x15x5 Xoar Prop
  • F3A Lorenz carbon undercarriage, fibreglass wheelpants, MK wheels
  • Futaba R7008SB receiver
  • Futaba T16SZ transmitter
  • Futaba S3073 Servos (4) for elevator and flaps
  • Futaba BLS171SV Servo (1) Rudder
  • Futaba BLS174SV Servo (2) Aileron
  • Graupner 1200 mAh 2S LiPo RX battery
  • efuelgauge for S.Bus
  • Oracover

Underside of the removable canopy shows the construction used – all laser cut balsa and ply

The tailwheel came with the kit and is a high quality item

I painted the carbon undercarriage white to match. (I know, I know…)


Of course I had to have matching wing bolts

The interior is spacious and fairly straightforward. It took a bit of work to convert it to electric, with a reinforced battery tray and modified nose.

I painted the rudder horns and linkages white (Never said I was sane…)


Flaps allow for some creative mixing. When the throttle is pulled back, the entire wing can be an airbrake if I want it too.

Contrasting underside

As always: more pictures to be found on my Flickr page.

Elexant ready

Ready for it’s first flight. It’s been a fun experience assembling the model, the quality of the “kit” and the instructions were really good. Now let’s see how it flies! As usual: More pictures here

Elexant build log

The Elexant is almost finished, just waiting for the proper servos to arrive. The assembly has been largely unspectacular – the Plettenberg Advance motor is like made for it, and with so much of the plane finished from the factory it’s the easiest plane I’ve ever assembled, and by far the best quality. The only mods I’ve made is to change the wheelpants and wheels for a smaller set, but that’s just a matter of personal taste. The quality of the supplied wheel pants was excellent. All that’s left now is to glue the aileron horns in place, and when everything is ready I’ll test the CG and decide the battery tray position.

I’ve added a few photos to the gallery, take a look here

Integral electric conversion

MY ZN line Integral has been converted to electric. It has been flown just a few times this year, and although I love the simplicity of the 170 CDI, I needed to strip the whole plane down and re-paint parts of the nose where the paint had been eaten away by Nitro, and the home-made soft mount needed replacing. It was not a small job – a new Hydemount would have required a hefty spacer from the original firewall, and would have added much weight. The engine itself needed lots of spare parts and servicing. After stripping everything, I weighed the lot – it came out at almost 1.9 kilos, including tank, throttle servo, linkage, CDI box and fuel tubing. A YS setup is heavy!  It didn’t take a lot of thinking to decide on going electric with this one. It’s a beautiful machine and deserves to fly. It pays to have two planes with a similar setup, so I set off converting it.

Before: YS 170 CDI and Hatori header. Since the picture was taken, it was refitted with a 9650 servo inside the fuse for the throttle.

I made a new firewall and bolted the Plettenberg 30/10 to it. The battery fit nicely above the undercarriage, and a test of the CG proved it would be no problem fitting the battery there. The bellypan has MK magic box snap lock fasteners, so I can change the battery very easily. The only practical difference is that changing batteries on a plane that lack plug-in wings, is that I need to bring the stand with me every time I fly. The underside of the plane where the pipe used to be is not very sturdy – only the area around the undercarriage is. I wanted to strengthen it without adding too much weight, so I drilled through the undercarriage former and the original firewall, all the way through to the new former and glued in two 6 mm hollow carbon rods. They add no strength to the structure of the plane, but when the battery straps are slung around them, the carbon tubes bear the weight of the battery across four sturdy formers, in the event of a hard landing. (Picture)

After: The battery tray is essentially a plate to raise the battery above the screws that hold the undercarriage. I couldn’t rest the battery on the screw head for fear of damage. To remove the undercarriage, the battery tray comes of with four small screws. As mentioned, the straps go through the floor where the pipe used to be, and are slung around the carbon rods. One rod also serves to hold the controller, along with a small nomex plate. The controller is offset from centre so that I can access the motor bolts if it needs to be uninstalled for some reason, alter the thrust line etc.

Other modifications include removal of the 2000 mAh Schulze battery in favour of a small 700 mAh LiFe battery. I haven’t weighed the finished plane, but calculations indicate it weighs the same or less, compared to it’s YS CDI former self. The nose has been sanded and the paint touched up, and it’s ready to fly. Stay tuned for a flight report in a week or so.

More before/after pictures

Xigris C1 build

The Xigris, my first 2×2 electric is underway.

– Plettenberg Evo
– Kontronik Jive 100 HV
– Futaba FASST
– 9650 x 2 in stab
– 9154 x 2 ailerons
– BLS154 rudder

Follow the build here

Ligier Gitanes Xigris

I was very depressed when I crashed my Laser. And when I’m down I go shopping. After a few text messages on the eve of the crash I was up one ZN line Xigris kit, a Plettenberg 30-10 outrunner and a Kontronik Jive 80 controller. Turns out it pays off to spread the word when you’re in the market for a new plane. Chances are somebody has a surplus kit or last years model standing around.

I’ve always had a soft spot for formula 1, and the 1970-80s brand cars in particular. Cigarettes and oil brands dominated in those days and are beautifully retro to look at now more than 30 years on. You remember Tyrell, Elf, Marlboro, Rothmans and the incredible all-black and gold striped John Player Special cars don’t you?


In honor of the early 1980s liveries that have stuck in my head since childhood I’ve decided to make a very special paint job for the Xigris. I’ve tried to emulate the look of the 1982 season Ligier Gitanes look. Gitanes is a French sigarette brand, quite appropriate for the French made and French-sounding Xigris, don’t you think? At least it will be quite original and eye catching. (The 3-view is not of a Xigris, but it’s close enough)


New plane: Kyosho Osmose EP

Update: It’s been flown, 5 flights total. The setup seems sound enough and the plane is extremely responsive. Low rates became high rates after some hefty tweaking on the radio. The rudder response is really out of this world. I cna’t belive the canalizer does all that but if it does, I don’t really see much point in having it, it’s just so responsive that I have to learn to fly all over again.

For winter practice and general fooling around: A new toy. The Kyosho Osmose is a wonderful little ARF and was just too tempting after I crashed my Mini Scalar last summer when the motor cable disconnected in flight and I had all that expensive equipment lying around. The Osmose is powered by a Kontronik Kora 20-14 outrunner and Jive 60LV ESC. Batteries are 5S 5000mah so that it can be powered by “half-packs” should I ever get around to going electric in my 2-meter models that would use 10S LiPos.

Servos are Futaba 9650 on ailerons and some Graupner DS8011’s I had lying around for elevator and rudder. A Fubata 6008 Fasst receiver and a small GP AAA 850mAh receiver battery is used as a BEC-backup.

Indoor video

Yes we do indoor as well… Audun flies his Vrolet.

Mini Scalar first flight

I finally got to fly the Mini Scalar that I spent the winter assembling and painting. The plane flew surprisingly well, requiring just two clicks of aileron trim. Surprising is putting it mildly, since I had to set up all incidences myself, my first time ever doing so. Nothing beats beginners luck. The plane is overpowered to say the least. I have never had a plane this powerful, ever. the 6s 4000mah battery was a good match and has enough power for two schedules pr. flight. I’m happy to have a new favourite practice plane for those quick out-to-the-field-before-wife-notices practice sessions. But I need more batteries, can’t stand waiting for them to charge at the field. And no, the props is not broken – it’s an Aeronaut folding 14×10 propeller, something that proved to be less than clever when used in combination with a motor brake on the ESC. A fixed prop is now on order, this plane really needs to slow down on the downlines and you can imagine how fast it is when the motor brakes – the prop folds and you have less, not more drag!

Aeronaut Rocky

Something for those dead calm summer evenings. I’ll power it with a Mega motor and kontronik PIX1000 I have lying around, and something like 2S 800-1000 LiPo. Incredible lightness, perfectly constructed.
Pictures will be added to Flickr.