JureZ's blog View Details
Posted by JureZ | Jan 29, 2017 @ 06:25 AM | 24,329 Views
Scratch built 40 inch (1 m) wingspan "Zagi" inspired flying wing. It is 5/6 scale of the original 48 inch wingspan Zagi.
The propeller is in the nose, in tractor arrangement, for noise reduction reason..
The wing was built armin style with foam board, paper peeled off. Reinforced with pallet strapping. Covered with clear packing tape and then shrunk with covering iron.
Total flying weight is 650 g.

Video taken during late afternoon and sunset at the Bald Mountain site in Walnut Creek, using Sony pocket cam mounted on modified safety helmet.

Zagich aka The little Zagi aka The Son of Zagi -- Movie (1 min 54 sec)

Posted by JureZ | Jun 21, 2016 @ 02:33 AM | 25,331 Views
Got the airframe for free at Baylands Park , with a broken wing, it needed some TLC to get in flying condition.

Many thanks , anonymous donor !

It has a 300 W in-runner motor, Kv =3900 RPM / V.
So, it operates in the ballpark of high 30 k RPM.
The propeller is a thin 5 in x 4 in

Battery LiPo 3S, 30C, 2200 mAh.
Wing span is 80 in, wing root chord is 7 in , wing area is 3.4 sqft.
All Up Weight is 45.9 oz, wing loading is 13.5 oz / sqft.
CG still needs a bit of trimming, feels nose heavy ...
Notice in the second launch, the visit of my friend the hawk .

Flying at Lariat Canyon, Walnut Creek, CA.
Great Planes Siren ,T-tail warmliner , maiden flight - Movie (2 min 36 sec)

Great Planes Siren, T-Tail warmliner, onboard video (1 min 51 sec)
Posted by JureZ | May 15, 2016 @ 02:38 AM | 22,012 Views
maidened on May 14th, 2016. Location : del Valle, Livermore , CA.

video link flying at del Valle, Livermore :https://www.facebook.com/sifon.templ...0806340437355/

flying at Coyote Hills : https://www.facebook.com/sifon.templ...3629403488382/

link to the Parkzone Ka-8 page : http://www.parkzone.com/Products/Def...ProdID=PKZ6675 (This link is dead now, model discontinued...)

Posted by JureZ | May 08, 2016 @ 08:11 AM | 20,664 Views
my Striker F-27C project started by purchasing two unpainted, bare fuselages from Joey at Baylands Park.

Wanted to have it set up as a slope glider, but did not have much success with this idea. I wanted to see it fly, but the wind conditions were never right.

Converted the model to a motorized craft using a 24g blue wonder type of motor.
It was kind of anemic, and I changed the motor.

With a Bixler motor (40g , Kv = 1400 RPM/V , rewound by me), flies great.
I am using a 7*6 APC propeller and the battery is 3S , with capacities from 1000 mAh to 2200 mAh.

link to a short video : https://www.facebook.com/sifon.templ...8061147378541/

another video, flying in Moraga CA

Joaquin Moraga - Striker Movie (1 min 43 sec)

Posted by JureZ | Apr 26, 2016 @ 01:21 AM | 8,705 Views

from the Wisel thread,https://www.rcgroups.com/forums/show....php?t=1456458
I scratchbuilt an EPP Wisel , 1 m or 40" wingspan.https://www.rcgroups.com/forums/show...postcount=1646
SpeedsterDen called it the Pinochio Wisel: https://www.rcgroups.com/forums/show...postcount=1647

hand toss glide test video https://flic.kr/p/CGeGPA
maiden flight at the slope video : https://flic.kr/p/CGKcoG
after some time decided to make it a motorized Wisel: here is my post:https://www.rcgroups.com/forums/show...postcount=2071
a link to the wing cam maiden video on facebook: https://www.facebook.com/sifon.templ...3276661190323/
ground cam video taken at Baylands Park, Sunnyvale CA: https://www.facebook.com/sifon.templ...5811200936869/
Posted by JureZ | Mar 19, 2016 @ 09:16 PM | 8,673 Views
Bought this T-28 plane at Baylands Park, from John P. , sometime last year. Could not maiden it until today.
It is a fabulous plane. Thanks John !

link to video : https://www.facebook.com/sifon.templ...6667626184560/
flying at Baylands Park, Sunnyvale CA :https://www.facebook.com/sifon.templ...7145232803466/
wing camera, at Shell Ridge, Walnut Creek : https://www.facebook.com/sifon.templ...5196848664971/
wing camera, at Lariat Canyon https://www.facebook.com/sifon.templ...0025224848800/
ground based video :https://www.facebook.com/sifon.templ...3457060172283/
Posted by JureZ | Mar 03, 2016 @ 12:08 AM | 8,171 Views
Entry for the Parkzone Corsair.

Bought it used from my flying buddy Greg, who helped me so much in the early days when I was starting to fly.
The plane has a 44" wingspan, and is hand launched and is set up as a belly lander.
link to a ground based video taken while flying in Walnut Creek https://www.facebook.com/sifon.templ...3670024150987/

another video, at Baylands Park : https://www.facebook.com/sifon.templ...5180728666583/

here are a few pictures, attached:
Posted by JureZ | Jan 23, 2016 @ 08:20 AM | 8,305 Views
got from member cityevader a Slope Monkey for free (Thanks!) .
Tried to slope it without success, and got tired of waiting for the right conditions.
Then decided to convert it to a powered plane.
Used a Park 300 motor, 800 mAh 3S battery and 7*6 propeller.

flies great !

video link: https://www.facebook.com/sifon.templ...1320175385972/
Posted by JureZ | Dec 31, 2015 @ 10:26 PM | 10,310 Views
bought a used Zagi wing at the swap meet .

It was set up as a sloper, but I converted it to electric power.
Used a PJS 3D 1000 (90 g) motor, with APC 8*6 Sport propeller. The battery is 3S 35C 2200 mAh.

link to maiden day video : https://www.facebook.com/sifon.templ...7720152412641/
Posted by JureZ | Nov 14, 2015 @ 08:54 PM | 9,626 Views
Here is my Dusty No7 conversion using UMX Spitfire guts.

Got the Disney Dusty plane as a gift from my daughter, and eventually installed the guts of a retired UMX Spitfire.

Recycled the four blade propeller, motor, receiver , aileron servo , elevator and rudder from the Spitfire.

The aileron servo drives the rudder, as this is a three channel implementation. Therefore, I did not have to make any special mix in the transmitter. Rudder and elevator are on the right stick.

The transmitter is a Turnigy 9X, with orange module.

AUW is 40 g (1.4 oz) , wingspan is 11 1/2".

It flies beautifully, I have run six 1S batteries already, video here: https://flic.kr/p/B5ATFD
Posted by JureZ | Mar 01, 2015 @ 06:50 AM | 11,260 Views
I built this plane following the thread started by Eagle-RC.com


Had a failed flight on the maiden day, just before Thanksgiving day 2014.
The plane flew away from me and was lost for about a month until Christmas eve 2014, when someone called me telling they found the plane.

The biplane was rebuilt and painted, and due to bad weather and other things, could not fly it again until recently.
It was re-maiden-ed , and now in the second week of its new life.

link to maiden flight after rebuild:

yesterday's videos:

https://flic.kr/p/rpwgCB and https://flic.kr/p/rnnnCC

Attached are some pictures and movie snapshots.

it was built using paperless dollar tree foam, covered with "doculam".

more videos:

....Continue Reading
Posted by JureZ | Feb 15, 2015 @ 05:38 AM | 10,019 Views
here is the first entry in the blog describing my new Flying Wing.

Recycled the aileron wing from the 54" chuck glider, adding a new fuselage and vertical stabilizer.

link to the maiden flight video: https://flic.kr/p/rbGZjz

important numbers

Foam wings, from 54" chuck glider, added ailerons, with two 9g servos under the wings.
Foam fuselage
Coroplast vertical stabilizer.
Wing Span = 54"
Wing Area = 405 sq in = 2.81 sq ft
AUW = 20 oz
wing loading = 7.11 oz/sq ft
motor super tigre 370 brush less , 20 A ESC
9x6 APC propeller (used GWS 8x4.3 for the maiden flight, a bit anemic for my taste, the plane invites more power and speed)
3S 1000 mAh LiPo battery
CG location : 2.25" from wing leading edge at the root.

Hand launched, belly lander.
Posted by JureZ | Dec 24, 2014 @ 05:28 PM | 10,132 Views
This entry relates to the Parkzone Radian, Radian_discussion_thread.

This story started like this:
Danny gave me as a gift, a Radian fuselage (thanks Danny !).
This fuse had a previous life as an FPV platform, with a power pod, pusher style, above and behind the wing trailing edge.
Dremel tool in hand, the pod was cut off.

I purchased a brand new set of wings and horizontal stabilizer from my LHS, 15 mi away ( HobbyTown, $44 total).

I used a 70 g brush less motor ( no data on make, model, specs), an equally unspecified ESC (I guess 30 A from its size...) , 2200 mAh 3S 25C Lipo battery , and a HK Super Kinetic folding propeller. Link to the HK folding propeller: Super_Kinetic_Prop

The motor was mounted in a non standard fashion , with the motor outside and ahead of of the Radian motor mount.
The motor current draw was 21 A at full throttle, on a bench static test.

The fuselage was covered with clear scotch heavy duty packing tape , which I shrunk with a sealing iron. This gave a lot of strength to the wobbly fuse...
Similar treatment with clear tape was applied to the wings, albeit not covering them completely, mostly the leading edge and the wing roots.

A couple of pictures are attached to this post showing the plane.
A roundel sticker for a HZ Corsair was placed under the right wing, three brown packing tape bars under the left one.

a video of the maiden flight can be found clicking on the link below:


Posted by JureZ | Nov 08, 2014 @ 03:47 AM | 11,567 Views
This is my High Wing pusher - 54" wing span Chuck Glider conversion project.

This is the first concept, as built and flown a year ago.

It is based on the wing taken from the "ULTRA Flyer" foamie , available at HobbyTown for $8.

The 54" wing was reinforced with bamboo skewers and strapping tape.
The wing area was extended with the addition of fixed ailerons (which became true ailerons in the second version , the last picture attached below shows the version No 1.1 , with the ailerons implemented ).

The fuselage was made from 1 1/2" foam , scavenged from packaging material. You may see plenty of use of packing tape and gorilla glue.

The motor is a turnigy 2217-16 , link to 2217-16 , 3S , 20 A , 73g , Kv=1050 RPM / V , turning propellers in sizes from 9x6 to 10x4.7.
The servos are turnigy 9 gram , plastic gear type.
The battery is a 2200 mAh, 3s, 30C, weight =200 g =7.07 oz..

video: https://flic.kr/p/iwWjFM

PS: article continues with Airplane Version No 2 in the next comments page, please see below.

Posted by JureZ | Nov 04, 2014 @ 04:50 AM | 10,303 Views
this photo gallery shows the flying site I use in Walnut Creek.
I call it "The Bald Mountain".

The hillside faces South, the prevailing winds are from the SW and W, which is very convenient for hand launching the planes into the cliff.

Access is a short hike of about 100 yards along the fire trail (dashed line in the Google maps photo view).

The trail is a bit too rough for a landing strip, but I have landed the SuperStar on it.
Mostly , the landings are "belly landings" on the tall grass.

As you may see, we enjoy the occasional visits from the local wildlife : turkeys, coyotes, deer, hawks, crows, etc...

....Continue Reading
Posted by JureZ | Oct 28, 2014 @ 12:17 PM | 10,789 Views
My implementation of the Vanessa CG machine.

found the attached construction document (pdf file) and decided I needed to build one.

I'll have to look up the thread where I found it in RCG ...click here for thread

Some pictures pasted below , to show its actual use with the mini Funtana.
Posted by JureZ | Oct 27, 2014 @ 11:57 AM | 10,109 Views
Hobbico Superstar EP

bought this airframe at a swap meet, for next to nothing.
Added new motor, ESC , receiver and servos.
After some time, landing gear , spinner , and a cowl made from a plastic bottle .

Finally , hired Felix as the pilot

Note: The Hobbico Superstar EP manual is attached to this post
Posted by JureZ | Oct 27, 2014 @ 10:21 AM | 10,668 Views
mounted the Mobius HD camera on a hard hat, as it is stronger and provides a more solid platform than other types of hats.

Went crazy with the stickers...

Posted by JureZ | Oct 27, 2014 @ 07:47 AM | 9,313 Views
Magnetic prop balancer

built using a finger prop balancer ( bought from Uncle George, a fellow RCG member ), and two magnets scavenged from Hard Disk Drives, previously part of the voice coil head actuator.

If interested , I have a few sets of magnets to give away for free,

click here to see a short video of the prop balancer in action
Posted by JureZ | Oct 26, 2014 @ 11:08 PM | 9,924 Views
Here are some pictures of the Mini Funtana I've got as a gift from Mike L (RCG member).

The plane needed just a little TLC to get in flying condition, and here it is waiting for the new maiden flight.

With the spare wing also provided by Mike , I would like to add a center section and use it as an aileron wing for the SuperStar EP.
This new section extends the wing span to 40"....Continue Reading