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JureZ's blog
Posted by JureZ | Mar 01, 2015 @ 06:50 AM | 1,274 Views
I built this plane following the thread started by Eagle-RC.com

http://www.rcgroups.com/forums/showthread.php?t=1243813

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:
https://flic.kr/p/rfXpVN

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".


....Continue Reading
Posted by JureZ | Feb 15, 2015 @ 05:38 AM | 1,926 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 | 2,249 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:

Radian_maiden_flight_video_link

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Posted by JureZ | Nov 08, 2014 @ 03:47 AM | 2,481 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.

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Posted by JureZ | Nov 04, 2014 @ 04:50 AM | 2,392 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 @ 01:17 PM | 1,988 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 @ 12:57 PM | 2,348 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 @ 11:21 AM | 2,472 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...


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Posted by JureZ | Oct 27, 2014 @ 08:47 AM | 2,208 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
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Posted by JureZ | Oct 27, 2014 @ 12:08 AM | 2,254 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
Posted by JureZ | Oct 26, 2014 @ 09:38 PM | 2,265 Views
My Static Thrust test fixture .


The Tachometer function is built around a Velleman infrared beam interruption kit , model MK120 ,
bought at Fry's for $8 , ( link to the MK120 kit ) , with some minor circuit modifications.

The digital scale is a Centech 1000g full scale unit bought at Harbor Freight.

The Fluke multimeter is set to the frequency , [Hertz] , measurement mode.

N [RPM] = 30 * Frequency [Hz] , in the case of a two blade prop.

To measure the battery current , I use a Simpson RMS Current Clamp meter

A servo tester is used to drive the ESC control input (bought from ED3, a fellow member of RCG).

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Posted by JureZ | Oct 25, 2014 @ 01:39 AM | 2,236 Views
just to get my blog started, here is a link to my flickr RC album:

Jure Z : my flickr album


click on the link above to see pictures and movies of my airplanes and equipment.