KristofferR's blog - RC Groups
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Posted by KristofferR | Nov 16, 2017 @ 11:50 AM | 874 Views
I bought this on a whim, $20 locally. According to the seller it worked two years ago. First action was cleaning, more cleaning and even more cleaning, it had the sticky film from glow engine use! I took out the Sanyo Cadnica and tried to charge it. If the radio works Im putting something else inside. If I like it maybe a 2,4 module will serve.
Posted by KristofferR | Nov 15, 2017 @ 02:35 PM | 656 Views
A while back, I made a refresh-thread on my Fox glider. I got it used and it could be a Gerasis, Robbe or Top Rippin.

After throwing it into some reeds it appeared to fly straight and some days later the wind was right and off the slope edge it went. It was absolutely sedate and went straight out.

I had put about 75g of ballast in, bringing the total weight to about 1750g, pretty light for a 2.2 slope glider.

It flew best with a bit of speed. Rudder was great, roll rate was too low and elevator too much, it was very touchy, I had guesstimated the throws. Yanking elevator in bank turns made the Fox slide, squirm and twist and snake itself, quick correction needed. Going at it harder would probably result in a full tip stall. I had a High Rate setting but did not dare to try it in case the elevator would be unmanageable.

Loops were straight and when pointed into the wind at altitude it would sit nicely in the lift, giving nice tells.

Stall turns were truly gorgeous, it rotated perfectly and fell straight back into flight with no tail wiggle at all and pulling up it went straight, indicating a good CG. The scale look added to the grace. Mmmm!

With no motor, the first landing was a one-shot deal and it behaved very nice, sinking nicely and finally dropping a wing at about 2ft and gently falling into the heather brush.


Next up is to try different throws, and fix some minor things left undone in the build.
Posted by KristofferR | Nov 14, 2017 @ 02:43 PM | 827 Views
I put the Pajero on the build board again. And out came the hacksaw and drill. I split the stock front bumper in two. One part at the front and one on the rear.

The front part was necessary, because there was a huge hole in the front after I cut the chassis.

The rear was just for fun. Good handle and fills some of the emptiness in the rear wheelhouse.
Posted by KristofferR | Nov 13, 2017 @ 12:59 PM | 963 Views
Multiplex Easy Star 2 flight with Mobius (2 min 20 sec)

My second Multiplex Easy Star 2. First flight. I used a 950 pack and a Mobius. The plane was slightly front heavy. I got about 38 minutes of footage and 32 minutes in the air with a Mobius up front and mAh to spare still. Four quick landings to move the velcroed camera. With the 2000mAh I expect to stay up for an hour. The plane is lightened and stiffened with carbon fibre pieces and I also used clear tape to smooth out any edges. Left to do is to put covers over the control horns.

Transmitter: Multiplex Cockpit SX 2.4
Rudder and Elevator: Emax ES08A2
Ailerons: Multiplex Nano S long wire
Reciever: Multiplex RX-5 light
Battery: Multiplex Li-Batt 950
Motor: Turnigy SK3 2826 -1240
ESC: Hobbywing FlyFun 30A
Camera: Mobius 1, Turnigy/SJ4000

Posted by KristofferR | Nov 12, 2017 @ 01:35 AM | 898 Views
I had the pleasure to watch Gustav performing on a flight show in Eksj, Sweden. He came with a fresh World Champion title to his name.

There are so many flight shows I have been to and only a few displays stand out. This one did. The program had my hair stand up on my back the whole time.

The flow and smoothness of the flight was apparent and on top of a flawless execution, to the point of setting the wheel down on the last bar of the song choice - ABBA:s Fernando.

While not RC, it certainly gave me something to aim for with my RC Fox!

Gustav Salminen - World Champion Advanced Glider Aerobatics 2017 (5 min 30 sec)

Posted by KristofferR | Nov 11, 2017 @ 02:08 PM | 1,072 Views
The Easy Star is ready for flight.

With a 3s 950mAh weighing 100g pushed all the way up front the CG is in range.

I have no decals on yet and 575g feels very light, but maybe it is just a mental thing. I saved 10g here, 11 g there. 8g somewhere else so perhaps it added up to something. 50g saved on the battery as the rear end of the plane was much lighter.

Rudder and Elevator: Emax ES08A2
Ailerons: Multiplex Nano S long wire
Reciever: Multiplex RX-5 light
Battery: Multiplex Li-Batt 950
Motor: Turnigy SK3 2826 -1240
ESC: Hobbywing FlyFun 30A

I replaced almost all plastic rods with various pieces of carbon fiber strips 3x1 mm. In particular the rear of the fuse and the elevator is extremely stiff. The fuse actually does not bend at all.

Wing is just very stiff.

If you do the same, you could buy 3mm tubes for the fuse but I took what I had around.

For the elevator, I cut a slot that was slanted and went in under the control horn. A straight 3mm cut would go right through the elevator. Then CA on the strip and push it in using pliers. This worked extremely well. Its really tight. I did not do the same on the ailerons as I did them first.

The stiffness and lightness should make this Easy Star fly well. It almost feels a bit like a balsa build to hold instead of the mushy foam feeling.
Posted by KristofferR | Nov 10, 2017 @ 02:44 PM | 1,232 Views
After spending most of my RC efforts on the used Fox glider recently, the Multiplex Easy Star 2 kit is back on the board.

Its a simple and pleasant build aided by excellent fit and a very good manual.

I have soldered up the Hobbywing FlyFun ESC and stick-programmed it.

Today the fuse is finished. It is stock, with some carbon strips. See previous post for more info.

The wings will get some carbon strips too before I start the motor and radio installation.
Posted by KristofferR | Nov 02, 2017 @ 12:52 PM | 1,745 Views
This text was posted in the Heron thread.

Wednesday I had the day off, and went early to the slope. Just before I got to the launch spot, it started to rain. I took shelter under some juniper in a crevice. Some twenty minutes later the rain faded. I assembled the Heron and launched it.

The flight was nice. It took a while to position the plane right; its much bigger than the ones I fly the most. My flying buddy Dan showed up while I was in the air. I stalled the Heron out a few times and tried to provoke it, it would drop a wing and fall, easily recovered with opposite aileron. Last time I flew the Heron the conditions were seriously difficult and somehow today I felt less connected. Typically, when things get hard I stop thinking entirely and fly by natural feel and that is usually the best flow!

Eventually, the light fog caused my glasses to get wet and my gloves too so I went around to hover land while my fingers still moved. I did not use the crow brake, I just let it sink. I had it right where I wanted it and walked closer to really spot land it. All was looking good but it suddenly dropped the right wing about 3 m above the ground and went down, wingtip first.

Parts were everywhere. It looked really bad. But it was not bad at all. First, it landed in the heather, not on the rock face. Secondly, the genius wing mount design did the job - wings fell off, canopy fell off. The fuse cracked like a hinge and a plastic wing mount broke off.

I collected...Continue Reading
Posted by KristofferR | Oct 29, 2017 @ 07:14 AM | 1,477 Views
After a bit of hesitation, I started tearing the Fox down. It would probably fly with just a receiver but my gut told me to go through it properly.

EDIT: I continued writing more in the comments

Using my wifes hairdryer to weaken the hotglue mess, I could remove a 90g NiCd 4-cell 600mAh battery, 189g of lead in the nose, recover some canopy magnets stuck to the tow and also remove the 41g box that housed the landing wheel. The glue alone was at least 25g. With the wing steel rods adding to 314 g the plane is heavily ballasted. As a sloper I am not against ballast but it seemed quite excessive and also very un-tunable.

I want my gliders to be as light as possible, with minimum drag. Stiffness is important too of course.

Going to the rear end, a linkage slop turned out to be a loose rudder hinge. Looking closer at the stabilizer it was a bit loose and fitted using steel bolts so I removed it planning to use nylon instead and get it tight. It appears to be a flat balsa sheet but it had a slight profile and it was, AFAIK upside down. I have built a few freeflight models with proper profiled stabs and they were all lifting designs. This one was fitted un-lifting. Hmm?!

The rudder and elevator servos are badged Euro Line. They look and sound metal geared and pretty well made. The servo tester revealed that mechanical adjustment of the linkages and throws was necessary. It was binding terribly. I had to remove the horns to run the tester.

I prefer to have my...Continue Reading
Posted by KristofferR | Oct 29, 2017 @ 01:03 AM | 1,350 Views
I got my eyes on this already before the meet opened. A Fox, slighly bigger than 2m, in glassfibre and balsa. Glider only build, nice paint job but cosmetically in need of attention and a bit of a general overhaul.

After some haggling it was mine.

Back at home I went to work removing randomly applied decals and cheap looking raggartejp as well as other unfinished traces of build.

(Raggartejp: Thin, usually chequered tape.

Span is 2.2 m approx.

Wings 265g and 275g
Canopy/cockpit: 101g with Smurf and tape
Fuse with tail, battery, nose ballast: 1040g
Wing spars were one 10mm and one 4mm steel rod, ending at 314g.
AUW at over 2kg

Google indicated that this model could be made by Rippin models and sold directly or to Robbe. Fuse is glassfibre. Stab is a balsa sheet. Wings are balsa planked. Text says SP-P587.

My plan is to slope it but I think I will put a motor in. My slope sites are truly unforgiving and being able to motor on to another round is a godsend.
Posted by KristofferR | Oct 25, 2017 @ 02:48 PM | 1,331 Views
I happened to get my hands on a NIB Easy Star 2 kit. This is a model I already owned a few years ago, although that one was RTF.

It is a simple build, instructions are clear and concise and parts fit is exceptional. Compared to building the Phoenix 1600 everything with the Multiplex is a lot better - fit, finish, instructions, labelling, decals.... Neat inclusions were all the hardware for the aileron upgrade and two sizes of propeller collet adapter which meant my non-stock SK3 motor fit right in.

My plan is to try some FPV. This would be my first FPV plane. I am also thinking about installing a 6-axis gyro - ie stability + bank limit - and letting the kids have a go. If you have suggestions which gyro to get please advice!

Ill share a few tricks I did on the build:

The long plastic fuselage reinforcements were replaced by two 3x0,5 mm carbon strips. One standing and one flat. The carbon strips are too light to show on my scale but 10-ish grams should be saved there and the fuse is much stiffer. Due to the stiffness I am not using the outer elevator and rudder snakes, that saves 7 grams. Not much, but if this goes FPV it will benefit from lower weight and most of what I saved is behind the CG.

The rudder horns are a critical and weak spot. I use a knife to carve / scratch up the glue-surface on the horn and on the control surface. I use Zacki CA in the groove and UHU Por on the flat. The CA will bite and keep the horn tight and the Por will be flexible and prevent the horns failing or pulling out.
Posted by KristofferR | Oct 07, 2017 @ 10:33 AM | 1,427 Views
I took the Phantom to Amundn (Amund Island) for a photo test. The sea is a good place to test the focus and tilt.

Wind and weather conditions meant the drone sound travelled all across the bay and I went high and did a quick few minutes of turns to minimize my disturbance to the hikers!

DISCLAIMER! Since I tried to do it quick you might get motion sickness as the "epic slowness" of aerial film is missing!

I am happy my work on the Zemuse gimbal and GoPro camera paid off - both were broken and bent in a crash. Looking closely at the horizon, the gimbal is just slighly bent still.

This is the first time I experienced the "jello" though and I am not sure why but I was flying faster and with more throttle than usual to combat the wind.

DJI Phantom 2, Zenmuse HD3, GoPro Hero3+Black

Music by me (if released, available at

Amundön, Phantom2 camera test flight (2 min 6 sec)

Posted by KristofferR | Oct 06, 2017 @ 05:25 AM | 1,289 Views
I have been putting off doing the maiden flight of my Heron for some time. I did not expect it to be on the slope, but I brought it along this time and the temptation to try it was too big. The Heron flew absolutely perfect - the launch was with hands off the sticks. I will do some fine tuning of CG and adjust flight phase mix compensations but that is about it.

Gear: Heron RR, Cockpit SX (1st gen) and RX-7 M-Link telemetry.
Site: Sandsjbacka Brcka, Kungsbacka, Sweden. ESE 9-11m/s
Camera: Turnigy 2k w SJCAM 4000 firmware
Music: By me, available if released at

Multiplex Heron, maiden flight - on the slope (3 min 44 sec)

Posted by KristofferR | Sep 30, 2017 @ 12:14 PM | 1,477 Views
Below is a post I made today in the Multiplex Heron thread.

The day before I maidened the Heron, right off the slope edge. I just had not gotten around to try it on the flatland and brought it to the slope on a whim. It flew really well.


Today I went to the slope again with the Heron. Wind was stronger, 12-14 m/s. I needed to sleep in and did not make it in time to meet my flying buddies; I met them on the trail on my way up and they were done.

Dan had crashed his Intention and Seppo stayed on the ground. Dan told me the turbulence took him and despite applying full power he could not recover. The Intention is a fast ship and his prime pick in difficult conditions. He warned me where not to fly and I am grateful for that.

Up top the wind was hard and it was difficult to walk. I decided to assemble the Heron and wait for the wind to drop a bit. I live near the coast, today the wind came from the inland and combined with sun that means thermals.

Launch was easy but the bumpy air was appalling. Basically, I needed to fly all sticks all the time to keep the Heron level. Venturing left I understood what happened to Dans plane, a weird wave/turbulence effect made sloping impossible and I powered up early to avoid repeating Dans crash.

I endured and eventually found a narrow corridor of lift to milk for altitude. Sometimes the wind died down a bit, indicating thermals upwind in front of the slope and then lift was very good. Problem was that...Continue Reading
Posted by KristofferR | Sep 28, 2017 @ 03:35 PM | 1,455 Views
First, I got thinking about a song by the Replacements called Bent (all?) out of shape that I think it was a cover version that I really liked. Can't find it anywhere.

The ZenMuse is not pointing straight and I watched a bunch of videos first and then started by removing it from the quad. I noted that the "plates" were slightly bent and the colour change indicated plastic deformation. Then some odd scratches caught my eye. Upon further inspection, the whole gimbal arm has taken a big hit and was 4-5 mm bent. Now I am impressed that it still works!

I went ahead straightening the thing with pliers, kids bedtime stopped further progress but I am hopeful to get it sorted!
Posted by KristofferR | Sep 27, 2017 @ 03:02 PM | 1,551 Views
The last coupe of days, I used the Phantom a lot.

First off was a bachelor party. I used all my little cameras, from hiding the Mbius to record the grooms' surprise, using the Phantom to do aerial videos of the guys, SJCam for gokarting, slowmo for beachvolleyboll etc.

A few days later I took some photos of my parents house and adjacent build sites. The weather was warm, windy and very gusty, occasionally 10 m/s according to the local meteorology reports. My thermal/slope glider mind noted great thermalling potential.

The Phantom performed really well in the dirty air, and after I set my Futaba T10J dual rates at 45-50% and added about 35% expo on top to tame the yaw sensitivity, videos get very smooth. Thats a definite Ooooh!

Flying FPV with the Fatsharks is also an Oooh, especially when I let the guys at the bachelor party have a "ride".

Bringing the Phantom 2 along for "work", ie not RC hobby but trying to deliver photos, highlights the improvements made in the later models. Lots of different items, lots of batteries and a general unability to adjust things on the fly limits the usability of the 2.

Judging by the way I constantly need to use forums to find answers, and that there is no proper DJI FAQ to help with all known issues highlights how DJI lacks support and documentation as well as a general SW robustness: Things like startup order or compass calibration procedures are unflexible, and old firmwares are deleted and...Continue Reading
Posted by KristofferR | Sep 12, 2017 @ 03:59 AM | 1,553 Views
For non-followers: I bought a damaged Phantom. The GoPro was broken. I fixed it. The GoPro battery showed 0V.

It made no sense as the Phantom batteries were behaving perfectly fine.

I opened up the GoPro battery to look inside. Sure thing, there was a little protective control circuit and two cells in parallel. They showed 1.7V which means they might be less dead.

I put 0.1 A into them using my B6 NiMH setting and they quickly got to 2,5V. During the next days I was increasing the amperage gradually as the voltage went up to 4.2V. Lots of pauses and checking for swell or heat. I got approx 1150-1200mAh into it and it says 1180mAh in the spec.

Next up is to try a discharge-charge cycle and see how it fares.

NOTE: All of this was done with me sitting at the desk, battery in a glass jar inside a LiPO bag and the whole setup made so I could easily unplug and throw it out the window onto the stone tiles. I have great respect for LiPO batteries and fires in general and I do properly discard of any puffed or otherwise damaged LiPO batteries. I have two smoke detectors and I have also trained/instructed my kids and my wife what to do in case there is a fire while charging.
Posted by KristofferR | Sep 11, 2017 @ 03:15 PM | 1,437 Views
I am so late getting into FPV. I was close pulling the trigger for a while bit decided to sit back and wait a few years to let the new and used market catch up and wow, it felt good to finally cross that border!

The mix of Phantom, GoPro, Immersion+OSD and a set of Attidude V2 goggles worked pretty fine even in the dusk.

I already have a smaller camera/transmitter kit on the way from Banggood to put on my Magnum Reloaded.
Posted by KristofferR | Sep 10, 2017 @ 04:55 AM | 1,864 Views
My CC01 Pajero is starting to resemble a car! Ther are a lot of details left before the correct Rally Raid look is in place.

The body did not fit perfect, the wheels sat about 3-4 mm wrong in the wheelhouses so I got my drill out and moved the rear brackets - from looking at other builds that seem to be a standard issue.

The front body supports are magnets, maybe I will drop it a few mm.

I have filed and cut most suspension and chassis parts for more flex, more steering and more ground clearance. The rims are original, but redesigned with a Dremel.

Next up is to do the scale thing. Never did that before so looking forward to trying and learning!

My blog about RC and other things: