Eurofighter spy plane

taping on the front gives more stable image

Failed take off due to losen lipo

Align DS510

You will be disappointed with the DS510 if you aim for a decent servo. But it will be a good one if one looking at the price initially.

1)It strips EVERYTIME there is a minor blade strike crash. Most of the time, at least 2 servo. Gear set are not sold cheap as it packs with bearings.
This annoys many of us despite there are "good comment" of this servo by some "supporters"
I think this is the same for 9650, but 9650 gear set is sold cheaper in my LHS.

So after replacing 2 sets, you will be regret not to use metal gear servo, as the price will be similar.

2)The slop of the 510 gear is horrible. There is absolutely no slop in the 9650. The slop cause delay in cyclic response despite good-looking spec. One can acutually see the swashplate rocking when the rotor is spinning on ground. My actual experience in during 3D when the pitch is moving precisely from + to - near the center, there is "deadband" response - meaning the stick should command a -ve pitch but yet no response because the "effective pitch" lost in the slop !!

The gear set of 510 and 520 are the same for the 1st, 2nd and 5th gear (count from the horn side). Majority of the crash will break the 2nd and 3rd gears.

SAPAC F16 II 首航

SAPAC 64mm 6 blade (GWSclone?) EDf
Stock outrunner , kv unknown
Power testing. 3s 2200mAh 26A, thrust ~650g
4s 2200mAH, 34A, thrust ~ ???
3s 2200mAh RTF weight ~720g, with landing gear

Very stable flight. Very fast even with 64mm EDF. Can drop in 70mm EDF without any modification.
This plane has CG issue. With stock 64mm EDF, 2200mAH 3s is nose heavy and the lipo has to be slide all the way into the fuselage. 4s 2200mAh is definitely out.
I end up by moving the EDF all the way to the back , so that I can use either 3s or 4s 2200mAh.
This plane 's airfoil is very thin, yet it stalls pnly at a very low speed.
The servo horns needs to point inwards, or else the push rod will hit by the horizontal tail.
I use the farthest servo horn hole (and innermost tail control horn hole) to have adequate ail/elev response.
The landing servo is a bit difficult to install because of the limited space inside the cockpit.
The long pushrod needs some strengthening....

Remember the tail fin needs to trim down a lot for straight level flight.

F35 reach airspeed 156 km/hr.

Airspeed sensor

Max 340W. Max airspeed 156 km/hr !

Trex 500 ESP Eagletree Log

Try to see if a cheap ($400 hkd) GE power 6s 2800mAh 25c works for violent 3D. All stock ESP settings.
Max. Watt 1400W. Max. Amp 64A. Average pack voltage 21.8V

Not bad!

J-power Eurofighter 2000 with 2x 2200mAh 3s

To test the ability of using larger pack for longer flight time, I use 2 packs 3s 2200mAh 20c lipo. It fit into the fuselage with some minor surgery. The fuselage is very spacious and easy to modify.

First flight was abandoned as weird noise originated from one of the ducted fan during full throttle take off. Luckily, this is a twin ducted fan version.

One blade is missing !

Something seems pluge into the foamA 5mm stone !

The EDF destruction is horrible as a stone is sucked into the duct through the cheater hole at the bottom. I should have sealed all cheater holes underneath !

Otherwise, the EF2000 flies great on 2x 2200 provide longer flighter time ~7mins. The extra flying weight of 180g is significant, thought it is more "stable".
I will try a single 2200mAh 34c lipo next time for better aerobatics..

Imax B8 charger A123 test

New version with SKYRC label

test with LiFe 7s charging

@2A charging, should be able for 6A charging @150W max

Clamp current shows very high accuracy


Internal temp probe guarantee charging temperature is safe. I will make a DIY external probe as well.Very unbalance cells in my 140 cycle 7s A123 pack
Final balanced packs

$3xx Flycam test

Worth HKD $350. Very tiny lipo,charging current is <100ma.>

The ram is made by SAMSUNG

Test photos. focus and colour not bad!

Real test data:
640 x 480 still capture
Video is only 352x 288 , 15 fps, around 10M/ min. video capture. Therefore 2G should be able to capture 240 mins. video.

Video Data:
bitrate 1945 kps, Ankarec H.263 codec, 914 kps
Audio PCM 128k, 8000KHz, 16 bit
Youtube can accept this raw format!
For Windows movie maker2, you need some software to transform (not re-encode, but transform the container such that WMM can read)

low light condition is satisfactory.
Sound quality is bad. De-syn !
Lipo charging has safety IC chips to protect over discharge and charging (G2NS powered by 8205T)
MCU is Anyka AK3224M. An old product with video and sound compressiosn.
The stock USB cable sucks. Took me 3 hours to find out the charging problem is due to the USB cable. Charging requires the cam to be switched "ON". Weird!
Orange LED flash on charging and lit continuously on full charging.

Non-stop video till fully charge battery shutdown: 90mins, captured 650M video
Full charging takes 60 mins.

Fully charge can takes ~ 1:30 mins video
With higher capacity lipo/ connection to 5V source) It can take video continously till the internal ram full, with clips of 1:30 hr each. Ext. SD ram not tested yet as the battery seems to be limiting factor.
The internal ram is SAMSUNG ram.

Flycam- How the canard works?

Time to test how good the canard in my Eurofigter works...

Happy X'mas Flying

Add a 2mm carbon rod to strengthen the long push rod. This largely increase the precision on high speed roll and loop.

Very strong Easterly monsoon today. Gust almost 40 kph.
Only my Eurofighter and F35 lightning can fly safely.

My F35 EDF suddenly squirl noisily and glide safely. Found the EDF migrated forward (due to the strong static thrust) and hence the blade touch the deformed fan duct.

Learned a good lesson that foamy glue may not be safe enough (especially there is no screw/ press lock to hold the removable fan bay)

Warplane Decal

http://www.afterburnerdecals.com/products.html

J-power F5E Maiden

Maiden successful. This bird has a small wingspan and long fuselage. It flies fast. There is a tendency to pitch down on slow roll turn, and needs more throttle to turn.

Intake duct is smooth

Battery compartment. Just fit a 1500mAh 3s lipo.

ESC compartment makes maintainence much easier.

F35 VTOL

Mixing scheme

Doppler speed 聲納測速軟件

用軟件推算速度

Step 1: 先用mp3, 手機, video 機攝下 飛機直線由遠致近, 由近致遠; 可接受AVI、MPEG、MPG、FLV（YouTube下載來的影片）、DAT、WMV、MOV、MP4、3GP
背景雜聲不可太大

Step 2: Download AoA audio extractor 抽下數秒的 wav 聲效, 要飛機由遠致近, 由近致遠的一段


Step 3: Waveoscope software, download

打開 wav 檔. 左 click 及右click 包括了完整的 approach 及 away 聲納頻, 要完整S形的一條

我隻AMX 計到若115 kph, 和用eagletree 測到的差不多

SAPAC F16 II

The inlet is great looking and to scale

The sticker is not made serious enough. What will one expect the air force flag has to be "assembled" by 6 pieces of red, blue and white stickers!

Vertical fin bent and not yet fixed

Except the stickers, this F16 is easy to assembly. I am running out of 70mm ducted fan and will try a 64mm EDF. This bird is not small , yet light and weight <400g without lipo and landing gears.

●Wingspan ---------------------------------700mm(27.56in)
●Fuselage total length --------------------1035mm(40.75in)
●Wing loading ------------------------------ 57g/sq.dm
●Main wing area ---------------------------- 13.4sq.dm
●Flying weight ------------------------------768g(27.1 oz)
●Thrust to weight ---------------------------0.9 to 1
●Transmitter --------------------4 channels or 6 channels
●Receiver--------6 channels(or Dual conversion 8 channels)
●Servo ---------------------------8 servo
●ESC -----------------------------------40A(or 50A)
●Motor -----------------------------------B2836 KV3200
●Battery ---------------------------------3S 2200MAH 15C
●Fan -----------------------------------5 blade 70MM