Κυριακή, 13 Νοεμβρίου 2011
Δευτέρα, 31 Οκτωβρίου 2011
Οποιο από τα μέλη του συλλόγου αερομοντελιστών Ηρακλειου Κρήτης (EAHK) επιθυμεί να συμμετέχει παρακαλείται θερμά να επικοινωνήσει μαζί του στο τηλέφωνο 6974-491-677
Παρασκευή, 28 Οκτωβρίου 2011
Πέμπτη, 27 Οκτωβρίου 2011
Τετάρτη, 26 Οκτωβρίου 2011
The new sensor with 11 MP, 3 different angles. Photo mode is also enhanced with 11MP resolution and a burst mode with 1 picture every 0.5 second
- 2X Sharper Professional Glass Lens
- f/2.8 Fixed Focus
- 170º Wide FOV (Including 1080p)
- 127º Medium FOV (In 1080p + 720p)
- 90º Narrow FOV
- 1080p: 1920×1080, 30PFS
- 960p: 1280×960, 48FPS + 30FPS
- 720p: 1280×720, 60PFS + 30FPS
- WVGA: 848×480, 120FPS + 60FPS
High Performance,1 /2.3” CMOS Image Sensor
Light Sensitivity: .84 V/lux-sec
Video Format: H.264 codec, .mp4 File Format
Exposure Control: Spot, Center Weighted
White Balance: Auto
- RESOLUTIONS: 11MP, 8MP, 5 MP
- FOV: Wide 170º FOV, Medium 127º FOV
- CAPTURE MODES: Single, 10 Photo Burst, Time-Lapse*, Self-Timer
- * Now supports time-lapse photo every 0.5 seconds. Requires Class 10 speed SD Card.
- Mono, 48 kHz, AAC Compression, Auto Gain Control
- Stereo External Microphone Input (3.5mm)
SDHC: Up to 32GB (Class 4 or Higher)
Παρασκευή, 21 Οκτωβρίου 2011
Πέμπτη, 20 Οκτωβρίου 2011
Τετάρτη, 19 Οκτωβρίου 2011
Τρίτη, 18 Οκτωβρίου 2011
Δευτέρα, 17 Οκτωβρίου 2011
Παρασκευή, 14 Οκτωβρίου 2011
These lightweight planes need some getting used to when completing loops inside and out. Turns on a dime, rudder is very effective. Low mass inertia is featherlike for this woodie making it pretty safe from catostrophic damage when boinked in. Huge flight controls are a saving grace when in trouble as you will see in the vid. Needs very little elevation to recover. Economical and easy to build
Τετάρτη, 12 Οκτωβρίου 2011
Τρίτη, 11 Οκτωβρίου 2011
Δευτέρα, 10 Οκτωβρίου 2011
Amazing!!! launching an electric F3F Vento from a hot air balloon!
Τρίτη, 27 Σεπτεμβρίου 2011
Κυριακή, 25 Σεπτεμβρίου 2011
Σάββατο, 24 Σεπτεμβρίου 2011
Παρασκευή, 23 Σεπτεμβρίου 2011
Τετάρτη, 21 Σεπτεμβρίου 2011
Μαντμαζέλ, κοινοβουλευτισιόν χοντροκλεψιόν γκαραντί,
απατεών αλέ ρετούρ και μίζα ντούμπλε φας.
Γκραν σουξέ, κι από μανζέ γκουρμέ... εξοπλισμέ, ζιμενσέ, χρηματιστίκ, βατοπεδουάρ, ολυμπιάντ, ασφαλιστίκ κασέ
και ζενερέλ φαταούλ αχορταγιέζ!!!Εμείς, ψηφοφορέλ γκραν μαλακιστίκ ξεφτίλ!
Τώρα, μέσα στο μαιζόν εγκλειστίκ, τρε μπατίρ, καταστασιόν απελπιστίκ, πολύ κοντά σε πεζοδρομουάρ βιζιτέ!!!
Δευτέρα, 19 Σεπτεμβρίου 2011
Veneered Foam wings with soarfilm covering.
The extreme low drag helps penetrate through strong headwinds such as this 30knot day at a south facing cliff at Sydney's Long Reef.
The front all flying canard elevator is mechanically linked to inboard elevators on rear canard wing. Outboard ailerons. No rudder control fitted or necessary.
Centre of gravity is approx 1cm forward of root of rear wing.
Inverted (upsidedown) performance identical to right way up.
It is nearly impossible to stall at landing speed and it is possible to pull full up elevator to slow it down for a vertical spot landing and still maintain roll control.
Interestingly, even though the fuselage was only made from styrene rather than tougher ABS the monocote form was very resistant to hard landings and collisions
Παρασκευή, 16 Σεπτεμβρίου 2011
Πέμπτη, 15 Σεπτεμβρίου 2011
Τρίτη, 13 Σεπτεμβρίου 2011
I've been a long-term critic of the Spektrum DSM2 2.4GHz system and that has earned me much scorn from Horizon and Spektrum themselves.
For almost two years, I have tried to tell the world that DSM2 was past its "best-by" date and that in an increasingly noisy environment, it simply was not as good as the growing number of FHSS systems being sold by other manufacturers. In fact, before DSMX was introduced, Spektrum's DSM2 was just about the only DSSS system left on the market.
Despite this, Spektrum continued to argue that DSSS was better than FHSS and that there were no intrinsic weaknesses to DSM2 (despite my proof to the contrary).
But then, in a rather abrupt about-face, Spektrum launched its new 2.4GHz system, DSMX and the first radio to offer this truly agile system, the DX8.
So how do the DX8 and DSMX stand up to close scrutiny?
Does it hop?
DOES IT USE THE WHOLE BAND?
Yes, at long last, Spektrum hops!
So, does this mean they have forsaken DSSS for FHSS?
No, just like JR with its DMSS system, Spektrum has opted to combine the strengths of DSSS and the strengths of FHSS to produce a hybrid that not only constantly hops about the band but also uses DSSS to spread each of its chosen channels far wider than simple FHSS alone could manage.
Spektrum claim this is the most advanced system on the market and while I have no doubt there are others who'd challenge that claim, I have to admit that it is a very good strategy for creating the most resilient link between radio and model.Powering up the spectrum-analyzer (SA) I found that yes indeed, the DSMX system does hop and produces truly excellent spreading right across the band
Is it resilient?
WHY DSMX IS GOOD
Most of the FHSS systems on the market rely on what is called temporal displacement and constant agility to prevent collisions between their signal and that from other users of the band.
In essence, this means transmitting for a very short period of time on one frequency and then switching to another frequency for the next short transmission. Since the radio is transmitting about 10%-20% of the time, this means the chances of two radios actually hitting the same spot on the band at exactly the same time are very minimal and, even if this happens, the pseudo-random nature of the hopping means that any data loss will be minimal.
However, if two FHSS systems do collide, the signals may interfere with each other and the data contained in those transmissions will be lost.
DSMX however, combines DSSS and constant hopping to deliver what should be a greater level of resilience.
Even if two DSMX systems find themselves transmitting on exactly the same part of the band at exactly the same time, the fact that they're also DSSS means that if each is using a separate spreading code, data will probably not be lost.
So does it work?
Well I tested the DSMX system under heavy interference at intensities several times greater than those which would knock a DSM2 system out of action -- and it didn't even blink. DSMX is indeed many times more resilient than DSM2.
Is it more resilient than an FHSS system like the Futaba FASST, FrSky ACSST or Hitec AFHSS system?
Well to be honest, it was hard to tell. These systems all have such good interference rejection capabilities that it's virtually impossible to knock them out, even in an artificially contrived test situation. Suffice to say that although DSMX does have a theoretical advantage, they're all pretty damned good.
LINK-UP, BROWNOUT ETC
Spektrum have made huge advances in their receiver technologies since those awful early days of high-reboot voltages and extraordinarily long reboot times.
The AR8000 receiver that came with the DX8 was as good as any other I've tested in terms of its reboot voltage and time.
The receiver continued to work just fine, right down to 3.2V -- sometimes a little lower and when the normal voltage was restored, it rebooted in under a second.
The reboot time for a total power loss was a bit slower but only slightly longer than one second. All totally acceptable.
Perhaps my only complaint about the Spektrum receivers is the need for satellite units.
As all the other major players have shown, modern 2.4GHz systems can perform perfectly without the need for multiple receivers. However, if you're one of the belt and braces brigade and can afford it then there's no harm in using satellites.
WHAT A DIFFERENCE
Top marks to Spektrum for bringing their 2.4GHz systems into the second decade of the 21st century.
In one fell swoop, they've gone from being very much at the back of the pack to now running right up there with the rest -- perhaps even better than the rest.
DSMX is a system that provides the combined strengths of DSMX and FHSS to deliver the most resilient link possible between pilot and plane.
If you're a DSM2 user who flies anything larger than a parkflier and wish to remain brand-loyal, thus retaining compatibility with your existing equipment then I really do suggest that you upgrade to DSMX as soon as you can.
TO THE GUYS AT SPEKTRUM/HORIZON
It has been reported to me by many people that Spektrum/Horizon were bad-mouthing myself and my critiques of DSM2. Apparently, I was not someone whose opinion could be trusted and I "know nothing". If you can't disprove the message then kill the messanger I suppose.
Well I'm sorry to disappoint but I simply call a spade a spade. DSM2 *is* past it's best-by date and is no longer suitable for noisy environments but DSMX is an excellent replacement.
Surely, the very fact that DSMX even exists is proof that there was some truth to my criticisms. If DSM2 was without fault, why replace it?
Despite what has been claimed, I have no agenda, I'm not on the payroll of any other manufacturer and I don't have a grudge against Spektrum.
I'm just following the policy I've always held: When something is good, I'll tell people and, when it's crap, I'll tell them that too. Plain and simple!
DSM2 bad, DSMX excellent.
Δευτέρα, 12 Σεπτεμβρίου 2011
Παρασκευή, 9 Σεπτεμβρίου 2011
Τετάρτη, 7 Σεπτεμβρίου 2011
Δευτέρα, 5 Σεπτεμβρίου 2011
Σάββατο, 3 Σεπτεμβρίου 2011
Παρασκευή, 2 Σεπτεμβρίου 2011
Πέμπτη, 1 Σεπτεμβρίου 2011
Τρίτη, 30 Αυγούστου 2011
* Best acceleration camber is 0°
* Best lift to drag camber is 4°
* Best sink rate camber is 8°
In general, a pilot will transit at a higher speed then best lift to drag speed which means for an efficient transition
he will need less camber. The same is true for low sink speed. So if you have to chose fixed camber settings,
I'd chose something like 3mm for cruise and 6mm for slow speed or slermalling. If you chose to use the camber
on your throttle stick, you could have 0° with forward stick and +8° with aft throttle stick.
When launching the plane into the breeze for the first time, make sure you have at least 2 to 4° of camber.
For landing, the flaps may be lowered down by 30°. The aileron horns have actually be sized so that they will
allow +-30° deflection just for this purpose.
The flaps down at 30°, the Wasabi will land easily at your feet even with gale winds. In order to retain good roll
control, you'll need to program a virtual dual rate switch with your landing flap setting so that aileron throws goes
to max when the flaps go beyond 20°
Then you have to consider snapflap setting and that makes things a bit more complicated because the idea is to
never exceed 8° of camber in order to avoid creating drag while not improving lift.
The Wasabi likes snapflaps but if you've followed me from the start the ideal snapflap curve would be to have +-
8° when general camber is at Zero and +-0° when general camber is 8°. So if you can create a snapflap curve in
your transmitter then it could be interesting to play with it along these guidelines. I personally haven't played
with a snapflap curve but I've chosen to have snapflap mix on a switch so I can remove it when I cruise with a lot
of camber or for some snap rolled and stalled stunts. Therefore I have the snap setting at +-5°. A lot of care
must be taken that your flaps go down by the exact same amount otherwise your loops will twist.
Center of Gravity
The CG for the first flight should be set at 88mm and then tuned to your taste.
With 88mm the Wasabi will need just a _very_ light forward pressure to fly level inverted.
Rudder deflection needs to be set as high as possible and the use of a fast servo is preferred. You will notice
that for some reason the rudder has a bit less authority then the Voltij rudder.
Slowing for Landing
Don't forget to explore the low speed limit with some camber (6mm-->8mm) and you'll be surprised. This will
also help you to free your mind about the landing and avoid landing too fast.
I've noticed that most pilots are reluctant to slow the Wasabi and they tend to land much too fast. You have to
force yourself to slow it down much beyond what you feel you should.
Also in strong winds, don't hesitate to drop the flaps all the way down to 30° (you have to mix an auto revert to
high throws beyond 15° of Flaps) and this will allow you to parachute with zero ground speed. I think it is likely
that you wouldn't damage the plane even when landing in rocky slopes if you use this high drag low speed