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Posted by JureZ | Nov 17, 2018 @ 11:13 PM | 1,243 Views
here is a video, after switching to a 10g brushless motor (custom rewound, Y , 36 Turns per tooth, wire AWG 33, Kv= 635 ) ,
10 A ESC,
Battery 2S 300 mAh 30C,
APC 7*3.8 SF Propeller ,
FrSky 4 Channel RX.
two UMX Spectrum Linear Servos ,
82g AUW, wing loading = 3.16 oz/sq ft ,
Static test current draw at full throttle : 2.2A @ 8V , 17.6W into the ESC.

Flying outdoors, note the smoke from the "Camp Fire"

micro nutball - 10 g brushless motor - new propeller - Movie (3 min 0 sec)

micro nutball - 10 g brushless motor - new propeller - Movie (3 min 0 sec)
Posted by JureZ | Sep 15, 2018 @ 11:39 PM | 2,856 Views
a gift from Danny , MiG-27 by Carl Goldberg , FQM117-B Military Drone for Target Practice.
Carl Goldberg meets Rube Goldberg.
Recycled using just the wing "Plank Style".

Wingspan: 70 in . Wing Area: 5786 sq cm = 6.23 sq ft . Wing Loading: 8.2 oz/sq ft
AUW : 1400g = 49.8 oz.
Added coroplast vertical fin.
Hyperion HP-S3025-08 motor
Aeronaut CAM Carbon 12"x10" folding propeller.
50 A ESC with separate BEC.
3S 2200 mAh 40C battery.
Two Futaba 3003 standard analog 37 g servos for the elevons.
Taranis QX7 radio
see parts details in the next comment in this thread

Maiden Flight Video
Carl Goldberg Mig 27 Drone (2 min 32 sec)

airborne camera video
Mig 27 - Carl Goldberg drone - airborne camera at Baylands Park Movie (4 min 49 sec)
...Continue Reading
Posted by JureZ | Sep 02, 2018 @ 11:19 PM | 1,335 Views
finally , everything was aligned for a great day of aero towing.
finished and tested the tow release mechanism mounted on the Sky Raiders chuck glider converted to RC.
prepared the twin Bixler 3 , now using APC 9x7.5 props , and installed the landing gear..

using 3S LiPo battery, measured a 40 A peak total current , i.e. 20A at full throttle on each motor , in static test.
10 pound test mono-filament line about 30 ft long.
A red ribbon , looped many times over , did the service of the parachute at the end of the tow line.
The tow release mechanism was home made, can be seen in detail in the video posted below.

of course had a lot of assistance, mainly from Sean and Vishwas.
With Sean we took care of proper CG placement and trimming.
Sean flew the glider and I flew the tow plane.
Vishwas was the ground camera boss.

here is the video:
Baylands Aerotow - Movie (3 min 34 sec)

Baylands Aerotow - Movie (3 min 34 sec)
Posted by JureZ | Aug 25, 2018 @ 06:44 AM | 1,865 Views
this is the EzFly built for my friend Vishwas M.
He is a colleague visiting from Bangalore, who wanted to learn to fly RC planes.
We came to the conclusion that an easily reproduceable and disposable trainer plane would be the the best choice.
He could learn RC flying using the EzFly during his stay here , and will rebuild it ( or another) back home.
He learned to fly very quickly to the point of being able to fly, land and launch all by himself.
Outstanding quick learner ! Congratulations Vish !

Vishwas M - flying the EzFly - second Movie (3 min 52 sec)
Vishwas M - flying the EzFly - second Movie (3 min 52 sec)"]EzFly ground based camera - 8-19-18 - Movie[/URL] (2 min 54 sec)
EzFly ground based camera - 8-19-18 - Movie (2 min 54 sec)
...Continue Reading
Posted by JureZ | Aug 02, 2018 @ 08:00 AM | 1,688 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 | 1,653 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 | 2,049 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 | 2,311 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 | 2,423 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 | 3,559 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 | 3,265 Views
the FlyFly Speedy

Speedy Movie (1 min 13 sec)

Posted by JureZ | Apr 21, 2018 @ 11:20 PM | 3,517 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 @ 11:15 PM | 3,399 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 @ 10:52 AM | 3,330 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 @ 06:25 AM | 6,462 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 | 7,650 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 | 8,425 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 | 7,777 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)