KristofferR's blog View Details
Posted by KristofferR | Oct 03, 2020 @ 02:17 PM | 1,474 Views
Leif gave me another plane, over 20 years old. Says “Big Swift” on the wing. I googled but found nothing. There’s some inflation on that name in the glider industry. It’s a V-tail glassfibre fuselage with a balsa wing, slight undercamber and double dihedral and a 2m span. Thermal style so I am a bit worried it will be bad on the slope where I tend to dwell. On the building board!

1: Checking electronics. The motor was impossible to get to so It had to be removed. It is a Jeti Phasor 30/3 at 1050kV. It pulled a monstrous 52A on a 3s with the 13x7 prop that was on. No way it would last!

I found a link at https://www.jetiforum.de/index.php/p...ppluftschraube
and it’s good I studied German at school. 35A max!

Maybe the NiCd:s of the time limited the current where the LiPos of today don’t.

In my box of RC gear I found carbon prop blades about 9x5”-ish that fit the collet and it pulled 26A on 3s and 43A on 4s. For now it will be 3s.

Next up to the servos, a trio of Hitec HS-80. No mix, just elevator on the V-tail. I don’t like that but will test fly before adding another to get rudder. On with the servo-tester. Elevator servo held fine. Right aileron too. Left aileron was a bit jerky. I disconnected the rod to the control surface and put my finger on it to feel if it had any strength and it promptly overheated and died. So new servos has to go in.

2: Airframe... some damage on the balsa wing trailing edge needed to be glued and a few beginning cracks in...Continue Reading
Posted by KristofferR | Jun 06, 2020 @ 12:47 AM | 5,100 Views
FunCub evening flight:


Multiplex FunCub evening flight (2 min 51 sec)

Posted by KristofferR | May 16, 2020 @ 03:44 AM | 9,387 Views
In the last couple of videos with the SJCAM SJ4000+ (Mine is the Turnigy rebrand, same same and I run the latest SJ FW) that there was a big fuzzy area on the videos.

I haven’t been very active making videos lately but felt that it was time to do something about it.
First I ordered a replacement lens. Apparently it’s the same as a GoPro 2. Now waiting for it.

The lens is already useless, so why not try to fix it? My magnifier showed lots of small scratches on the lens and a few bigger ones. I could not feel them so they were not very deep. First I went at it with Autosol polishing compound and it seemed to help a little but it took ages. Then I used the compound with a Dremel and a polishing pad. Lo and behold... it worked! Few minutes only. No scratches and a clear picture.

Not sure if this is what you are “supposed” to do as the lens will certainly be distorted to some extent but here it seems to work.
Posted by KristofferR | May 16, 2020 @ 01:41 AM | 8,336 Views
The canopy on the FunGlider was looking a bit scratched so I spent five minutes putting on a layer of paint.

I used Tamiya X-18 Semi Gloss Black paint left over from my CC01 Pajero build.

It also worked fine to detail the FunCub with the same black paint and X-11 Chrome Silver and I used orange on the canopy of my EasyStar FPV build some years ago.

No preparation except making sure the surface was reasonably clean. So far it has stuck well to the Elapor.
Posted by KristofferR | May 07, 2020 @ 01:50 PM | 7,849 Views
Great sunny weather and a good wind. I have been longing for this.

The Multiplex FunRay went out first and it was very good. And it’s so convenient to just insert wings and battery and fly. I will note here that my fb Dan has the Multiplex Solius and the FunRay is noticeably stiffer and more stable. The Solius flutters around more and is jumpier.

We did not get to compare them because the elevator servo died on the Solius, luckily it stopped in neutral and Dan brought it down very cooly after some initial panic and confusion. The wings fell off but no damage except a scratch on the wing.

Landing on this slope is tricky but I decided to be patient and it took eight passes before I was safely on the ground. I have set the FunRay up with both butterfly and spoiler and used only half spoiler.

TUTORIAL TIME: One very good way to land is to fly in behind the slope (not too far, try short first and do laps) and when you are over the desired point, pull some elevator and if the plane is not an evil wing-dropper (spoiler helps) it will just stall a bit, drop straight and recover. Let this go on and be patient and eventually you will be on the ground.


Now: The old T-Sperber, now with rudder! Faster and slower than the FunRay, made altitude easier, was easier to land and well, was impressive for a design from the mid 80’s. I’m going to load it with ballast next time, it’s designed for twice the battery weight. It flies very well and looks great in...Continue Reading
Posted by KristofferR | May 03, 2020 @ 03:11 PM | 6,803 Views
I got this off FB Marketplace for $20. The airframe was really not worth it, but there was a lot of balsa and thin ply veneer which I thought could come in handy.

Before, I had two very similar models. My Hobbyträ Blue Phoenix glider with a Cox 049 on a pod and later the Astro Challenger with a 540 can and 7-cell NiCd. Both were rudder-elevator with double dihedral.

The Precedent has a flat bottom profile similar to the Clark Y of the Phoenix and the frame is sturdy, the fuselage is very roomy and the wing is very heavy and not very stiff. Also, there were several major build mistakes; like the wing saddle, wing joiner and stab did not line up.

One fun thing was the wire-controlled rudder, that was a first for me.

I tried the plane of course, straightening out what I could, threw some weight up front, put servos in and launched it. It did glide OK.

I scoured for some parts and matched a 380 brushed motor with a 5000mAh car LiPO. I knew the motor was very weak but did not expect it to actually slow the plane down. 😂 Bad prop choice.

In retrospect that might have been predictable. So it barely climbed but was quite pretty in the air when I shut the motor off and let it accelerate and glide and do the typical dihedral turn thing.

Planes are supposed to fly, right! Still, I don’t know what to use it for; my old planes of this type were lighter, much better built (ahem) and flew better too. If I want to fly something like this again, a good relaxed glider for thermals, Höllein have a couple of great options.

So it’s back on the shelf for the moment.
Posted by KristofferR | May 01, 2020 @ 02:10 AM | 7,226 Views
New and old got mixed at the slope today. Conditions were probably the worst me and my fb Dan ever experienced, the promised 6-7 m/s were more like 5-12 and with crazy turbulence. On top of that it rained on and off and it was 6C. Since there has been no slope wind for months we went for it.

The Sperber was impressive. It’s a true all rounder design, a bit too heavy for thermals but not a hotliner. It handled the gusts nicely, is consistent and predictable without being boring and will definitely perform on the slope. The flight was good but I messed up the landing and came in short and landed on a rock which tore a small hole in the covering. I love the aileron response. It’s on the board now to get a rudder, I really need that.

Launch clip:
https://www.instagram.com/p/B_nm_YfF...=1oq8sp73l8m67

We had to shelter from rain for a while and then I helped Dan launch his big ASW and it eventually went down on the frontside after two consecutive rotors just dropped it out of the sky. The T-stab broke off, plastic screws so no real damage.

Last out was my Topmodel CZ Swish E and the high expectations were met. Even in these worst of conditions, it flew exceptionally well and I could enjoy the flight. Wow, just wow. Both me and Dan have joked about the “fishing rod” airplanes - mainly on aesthetics- but the flight performance of our Swish planes are convincing.

Now I am on the lookout for something that flies like the Swish but in a larger size... perhaps 2,5-3m size.
Posted by KristofferR | Apr 25, 2020 @ 11:24 AM | 6,049 Views
I was given the T-Sperber by a friend of my dads. The friend had a company , LRN Teknik, that imported electric powered aircraft and motors etc from the USA to Sweden back in the late 80:s, mainly Astro stuff but also German like Plettenberg and the Sperber range.

I bought a lot of my gear from him and also gave him my old Astro Challenger about fifteen years ago.

The text on the fuselage says T Sperber and I remember it from the old catalogue. It was designed by the German engineer Helmut Meyer. The motor in this example is a geared Astro Cobalt 05 and the ESC a Jeti capable of 12 NiCd cells. In those times I was a student and these things was completely out of range for me economically. My strongest motor was a tuned direct drive Reedy 540 motor intended for cars - a good motor from a venerable brand! It feels a bit fun to own one of those “top end” motors.

After testing the electrics once, twice, thrice etc I eventually mustered the courage to bring the Sperber to the field as I was itching to try it. I did at least ten test launches with no motor, trying to get the CG and trim right. It flew very nicely and when trimmed it did glide a long distance.

The plane is designed for a truckload of NiCd cells so the 3s LiPO ended up almost touching the motor, but it still was a bit tail heavy so I might put some lead in or a bigger pack.

Then I went all serious and repeated this procedure and tuned the elevator trim with the spoilerons up!

Range test ....Continue Reading
Posted by KristofferR | Apr 20, 2020 @ 01:48 PM | 7,581 Views
“The Snail”.

My Magnum Reloaded keeps on flying and the last few nights we did fun spring flights. I flew the plane and the kids took turns trying to catch it!

It has been truly beat on over the years and I think it has about 3 meters of carbon rods added by now after crashes made wings, tail and motor mount rip apart, bend, squash or in a notable case - penetrated by a tree branch.

About ten propellers were broken and it even wore out a HiTec servo! It has seen lots of different radio gear and batteries but the Hackermotors A20 brushless and ESC combo just keep going and going and I have been punishing them far outside specs regularly overpropping on 3s to carry camera gear.

Hats off to Hölleinshop who set me up with the kit and I’m proud to sport their team colors!
Posted by KristofferR | Apr 11, 2020 @ 02:12 AM | 8,732 Views
The weather is beginning to get better and finally the Swish got in the air. The idea is to just test it before hitting the slope.

The previous post is here:

https://www.rcgroups.com/forums/show...E-in-the-house

It did fly well at first. Range test and pre-flight check passed, the launch was undramatic and I did a few circles and landed to check everything.

Next then took it up to 120m and let it float. A couple of riders on horses passed on the trail on the other side of the field so I turned sharply and flew to the other side, in case I had to use the motor I did not want to spook the horses.

During the next few turns the Swish felt sort of mushy so I landed as quickly as I could. The left aileron control horn was unstuck and held in place only by the covering film. Annoying since my pre-flight check routine includes pulling at all surfaces and I did it and they were tight.

I always go to great lengths when I glue control horns (and usually prefer the bolt-on variant) but this plane was so well built I assumed it was done properly....! Assumptions does not make things fly, and this test flight was apparently needed before future launches off a cliff.
Posted by KristofferR | Dec 03, 2019 @ 04:09 PM | 6,901 Views
Slope soaring “the dump”. Top Model CZ Swish, Hobbyking Coyote / Ridge Runt & Multiplex Funglider.

Slope soaring the dump. Swish, Coyote & Funglider (4 min 0 sec)

Posted by KristofferR | Nov 30, 2019 @ 03:31 PM | 4,356 Views
My fb Dan has a Swish glider for the slope. It flies great. When one with a motor on surfaced on a local auction site I bid, won and drove a 3 hour roundtrip to pick it up. It was in very good condition.

The seller had a lot of common interests and some very nice RC airplanes. A nice detail was his own 3D-printed air inlets on the Swish.

At home, I put it on the bench to go through everything and found it well built and needing no particular attention. Per my usual habit I put the servos on a servo tester and let everything run for some time to ensure things were working fine. I de-soldered the T-connector and put an XT60 in - mainly because it's what I decided to use all around.

The prop seemed to be a bit big for the motor though. I looked at the motor, counted the poles, measured the outer dimensions and the unloaded kV - the motor it is really well encased and being screwed on from the inside it appears very hard to remove. After some Google work I concluded it was a Turnigy D2822 14 1450kV (or a rebrand).

The prop was unmarked but measured up to about 9x6 or 9x5 which is way too much. A quick test confirmed it with 20A through my current measuring clamp. That means about 220-230W through a motor limited to 160W. It got very very hot in just half minute.

I put a 7.5x4 CAM Carbon on (19/10 cm), the best I could find rummaging through my boxes. Got 12500 rpm and 11,8A with a big 3s (chosen for measurement to avoid potential voltage drop). This turned...Continue Reading
Posted by KristofferR | Aug 27, 2019 @ 08:10 AM | 4,874 Views
Video from the second outing with the FunRay at Vallda Sandö.

I do love the ease of assembly with the connectors fixed in the wings.

Launch is extremely stable and the general feel is solid. It flies really well and retains energy in the headwind with ease.

The effect of the camber setting is very impressive, it climbs nicely with my hands off the sticks. So far I have been less successful getting a nice behavior with the reflex - speed is up but lift is compromised too much. Inverted looks promising, and roll rate is very good.

Messing up close to the slope from inverted and recovering way down low shows it is capable of flight right on the edge of stall as well. This is also indicated in the landings which have been easy on the slope. I find it challenging to land in dead air, even with full butterfly, it keeps the speed up anyway and glides for a long time.

Funray second slope flight, Vallda Sandö WSW 12m/s (3 min 23 sec)

Posted by KristofferR | Aug 17, 2019 @ 10:25 PM | 3,819 Views
Finally, my FunRay on the slope!

Multiplex Funray, slope maiden at Vallda Sandö Kalven. 11 m/s WSW (2 min 7 sec)

Posted by KristofferR | Jul 25, 2019 @ 02:27 AM | 6,695 Views
Short recap:

FunRay bought 2017. Spent years on a shelf. Build start. Leading edges wrong in kit, fixed swiftly by Swedish distributors Autopartner.
One minor hitch, wings would not seat perfect, wing joiner bottomed out. 2mm foam removed. All good.
Otherwise easily assembled.
I taped all edges for aerodynamic efficiency.

Turnigy SK3 3640 1050
12x6,5prop
ZTE Mantis 65A
2000 mAh 3s (needs bigger batt)
EMax servos
MPX RX-9 and Cockpit SX

Weight 1772 g
Static 45A measured (battery limits this)
2600g thrust calculated

It climbs vertical.
It is glides quite fast and retains energy well.
Roll rate is very good ( ailerons and mixed flaps)
CG 3-4mm behind the dots still give very faint positive stability, but touchy elevator. I will go to the dots.
Responsive! I could not handle high dual rates.
Excellent glide, in reflex and camber too.
Stall, drops a wing and recovers after ... perhaps 6-8 m.
Despite butterfly, surprisingly reluctant to come down.
No foam feeling. Just sort of solid.

I think it will be great on the slope.
Posted by KristofferR | Jul 25, 2019 @ 02:06 AM | 6,132 Views
It turned out pretty well. The Tamiya TS-19 metallic blue is really good looking.

I put matte clear paint on the big square logo, polished the aluminum panels and then put matte clear on them too and wrote some text on them.

I still would have wanted to do the text for the aluminum panels better, but since I’m not keeping this TX it is better to let the new owner do it.

My personal setup would be using the throttle cut free mixer trick and I might swap the flap/spoiler cables like Ville. Also an extended neck strap arm to get the balance right.

A pro approach would be to use some stickers or print out something nice.
Posted by KristofferR | Jul 20, 2019 @ 04:37 PM | 6,006 Views
A few weeks ago, I absent-mindedly bid on a Cockpit SX on a local auction site.
What I really wanted was the receiver, but I thought my bid would be too low and forgot about it.

To my surprise I won the auction and got the receiver and transmitter in the mail.

The transmitter was truly hideous. The pics did show it, but I had not been looking at them close enough. The gray surface was worn down, the whole thing dirty and gross.

Hmm. I decided to dismantle and to my disappointment, almost all the plastic pins were broken inside. I threw the parts in a box.

A week later I decided to look at it again and figured there was little to lose by trying to repair it.

After serious cleaning a I painted the front with Tamiya TS-19 metallic blue (white primer underneath) glued the little pins back as best as I could and put the thing back together.

The glue has no chance holding the screws so I had to glue some parts in place and use two pieces of balsa to support the switch board for the toggle wheel and trim buttons.

I also realise how much better my new Cockpit is. So this will be sold when I’m done!
Posted by KristofferR | Jul 08, 2019 @ 02:43 AM | 6,759 Views
Normally, I tend to modify the stock decals on my kits, but I really like the looks of the FunRay decals.

Also, I hope the design is thought out and will be good for visibility.

The sheet is of xcellent quality and easy to apply, even the big ones on the wings went on smoothly.

Soon ready for maiden flight
Posted by KristofferR | Jul 07, 2019 @ 12:30 AM | 6,877 Views
The FunRay build continues.

I hit a stop when the kit contained two sets of left (or right?) leading edges for the wing. The seller RCFlight and main importer Autopartner solved it quickly. (My kit is an early batch and it spent over a year on a shelf in my closet!)

Most of the assembly is straightforward and aided by the excellent instructions.
I noticed one exception and that was when assembling the plane. The wings would not go all the way in. Apparently the protruding wing joiners bottomed out in the EPP foam. I measured three times and then removed 3-4 mm of foam and that was it.

The most time was spent on the cabling, the wings are designed for MPX M6 connectors and I made my own cables which required 24 soldering points...

Tip: Make sure the connectors to the tail servos are secured somehow. I accidentally pulled my rudder cable out while programming the TX and it took about 45 minutes to sort it!
Posted by KristofferR | Jun 21, 2019 @ 01:53 AM | 6,738 Views
During the last slope visit with the Fox I had some serious problems seeing the planes attitude. In the sun there was no problem but again a grey overcast sky it was tricky.

The paint job is very striking but not optimal for visibility. In particular the small chess square pattern on the wings underside looks great up close but from a distance it becomes just a slight red/pink colour. The wingtips are orange and red on the upper side and they look the same when the distance increases.

Almost any pattern that’s not extremely clear becomes a camouflage when the distance increases and I decided to simplify the graphics.

The chess pattern stickers was removed from the bottom and I added two large black stripes. On the top I took away the black letters and increased the orange area on the wingtips and elevator.

Finally I glued some medium grit sandpaper to the fuselage sides to help with the launching. It’s really difficult to hold the big fuselage in one hand on the slope!

Also, some improvised servo covers and some tidying up of the canopy.