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Posted by JureZ | Aug 02, 2018 @ 08:00 AM | 842 Views
Percent Battery Charge monitor, Lua Script for Taranis (tested on the QX7)

OK , here is the package with my script and supporting documentation.
the script is "my_bat.lua" , ( remove ".txt" from the filename).
It should be stored in the memory card under the directory SCRIPTS/MIXES
The script produces an integer number, the Percent Charge remaining.
It may be displayed on the Telemetry screen and may also be read out loud by a special function.
(see screen shot pics of these screens)
The assumption is that there is a Voltage sensor in A2.

The instructions may be followed from the attached file "Model Script Example Automatic Battery Cell Detection.docx " , from where my script was derived .
The table of percent battery charge data was taken from the package ""
The XL spreadsheet included in "" has the cell Voltage - Charge data and charts .

Credit goes to these sources for most of the material I used :
OpenTX- LUA reference guide
Model Script Example: Automatic Battery Cell Detection

Battery Checker Version:4.1

I hope it works for you !

my original post, on the QX7 thread :
Posted by JureZ | Jul 23, 2018 @ 09:07 AM | 835 Views
maiden flight after repairing the wing and installing an UMX brushless 2S motor: July 21 2018.

Brushless motor ,
Model: 1811-2000
Kv = 2000 rpm/V
Weight: 10g
Suggested Power: 7.4v
No Load Current: .4a
Thrust: 130g / 5000rpm
7.4v no-load speed: 15000rpm
Peak Eff Current: 5.5A
Shaft: 2mm
Diameter: 18mm
Length: 30mm (including mount & shaft)

10 A Castle Creations Phoenix ESC , updated FW to V 4.22

Graupner CAM 6" x 3" folding propeller
Actual current on the bench , static test : 5 A

2S battery , 300 mAh 30C , 20 g
4 Channel FrSky receiver with telemetry

AUW 343 g = 12.1 oz
WL = 4.94 oz / sq ft

EP ex DLG Movie (2 min 47 sec)

Posted by JureZ | Jul 08, 2018 @ 05:18 AM | 1,290 Views
Northeast Sailplane Products Shark Slope Glider ARF. 60" wingspan. AUW 710g.

The ARF Kit was purchased at the Baylands barbecue, raffle , fly-in, and swap meet organized by Ray M.

Sean dared me to purchase this kit , and I did it (while he was not looking) .

Maiden flight at Coyote Hills.

Flying with Chad, who gave a few pointers on trimming and CG location.

Notice the scary launch, his launches were much better after trimming ! Many Thanks Chad .

This is my first real slope racer plane and I am very happy with it !

Shark sloping at Coyote Hills - Movie (2 min 41 sec)

Posted by JureZ | Jun 06, 2018 @ 09:52 AM | 1,574 Views
Sky Riders Chuck Glider plane bash.


Sky Raiders - converted chuck glider RC frankenplane - maiden flight - Movie (1 min 39 sec)

Bought it at Michael's for $8 , could not resist to make a conversion.

Added ailerons from a donor glider. There are two HS55 aileron servos on the wings. Added a 4 mm carbon fiber tube spar into the wings.
Cut the trailing edge of the horizontal stabilizer straight , to add the balsa elevator. The elevator servo is located at the tail.
Cut the fuselage 9" from the nose to make a firewall and motor mount .

Wingspan : 48", length 28".
CG location : 140 mm behind the leading edge of the wing at the root.

Motor : " Blue wonder " , 25g .
Propeller : 8*4.7 GWS .
Battery : 800 mAh 3S LiPo.

AUW : 425g = 15.11 oz .
Wing Area = 368 sq in = 2.56 sq ft.
Wing Loading = 5.88 oz/sq ft
Posted by JureZ | Jun 03, 2018 @ 09:51 PM | 1,676 Views
got this plane from Clay.
Had it flying first as an Electric Power Glider , and finally decided to make it a true glider.

here is the video sloping at Coyote Hills , on June 3rd, 2018 .

ASW28 at Coyote Hills - June 3rd 2018 Movie (1 min 33 sec)

Posted by JureZ | May 15, 2018 @ 09:57 AM | 2,690 Views
please click on the "COMMENTS" button below to see the list of items I have for sale
Sold items are indicated as such.
Posted by JureZ | May 10, 2018 @ 03:31 AM | 2,476 Views
the FlyFly Speedy

Speedy Movie (1 min 13 sec)

Posted by JureZ | Apr 21, 2018 @ 11:20 PM | 2,626 Views
Swift model airplane designed by Thomas Buchwald

Mauersegler plans downloaded from
my plane is a bit larger than the original design ,
780mm wingspan, 50g motor, with kv = 1400 RPM/V,
3S LiPo 800 mAh battery, 7*6 propeller. 380g AUW.
two Futaba 5g servos

Swift - Mauersegler - maiden flight - Movie (2 min 13 sec)

Posted by JureZ | Jan 16, 2018 @ 10:15 PM | 2,625 Views
this is the blog entry for the powered launch dolly.

Starting from a toy RC car, I modified it into a motorized dolly.

the dolly is self powered , running from its own 3S LiPo battery , with a 20A brushed ESC, FrSky receiver.
There are two brushed motors wired in parallel, with gearing. Each motor drives one rear wheel. .
Aileron and rudder are mixed for the steering servo channel , so that dolly pilots may steer with the right and left sticks.
The Throttle is on the left stick.

here is the video of the first day launching the PZ Radian at the Bayside RC Club.

Motorized Dolly launch - Movie (0 min 29 sec)

Posted by JureZ | Dec 28, 2017 @ 09:52 AM | 2,607 Views
After having kept it a couple of years in the attic, waiting for the right time to maiden, I have finally decided to fly it at the Bayside RC club.
There is a nice geotextile runway where many types of airplanes are flown, gas , electric , EDFs , and turbines.

here is the video :

T-28 Trojan maiden flight at Bayside RC Club - Movie (2 min 45 sec)

Posted by JureZ | Jan 29, 2017 @ 05:25 AM | 5,753 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 | 6,915 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 | 7,551 Views
maidened on May 14th, 2016. Location : del Valle, Livermore , CA.

video link flying at del Valle, Livermore :

flying at Coyote Hills :

link to the Parkzone Ka-8 page : (This link is dead now, model discontinued...)

Posted by JureZ | May 08, 2016 @ 08:11 AM | 7,068 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 :

another video, flying in Moraga CA

Joaquin Moraga - Striker Movie (1 min 43 sec)

Posted by JureZ | Apr 26, 2016 @ 01:21 AM | 7,401 Views

from the Wisel thread,
I scratchbuilt an EPP Wisel , 1 m or 40" wingspan.
SpeedsterDen called it the Pinochio Wisel:

hand toss glide test video
maiden flight at the slope video :
after some time decided to make it a motorized Wisel: here is my post:
a link to the wing cam maiden video on facebook:
ground cam video taken at Baylands Park, Sunnyvale CA:
Posted by JureZ | Mar 19, 2016 @ 09:16 PM | 7,514 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 :
flying at Baylands Park, Sunnyvale CA :
wing camera, at Shell Ridge, Walnut Creek :
wing camera, at Lariat Canyon
ground based video :
Posted by JureZ | Mar 02, 2016 @ 11:08 PM | 7,191 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

another video, at Baylands Park :

here are a few pictures, attached:
Posted by JureZ | Jan 23, 2016 @ 07:20 AM | 7,470 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:
Posted by JureZ | Dec 31, 2015 @ 09:26 PM | 9,404 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 :