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This is the Aussie SCARAB Knife r2 270mm mini Quad - RED AIR edition Electronica kit with GPS - Super stable - super quiet - The Knife 270 is designed to have an internal mounted battery in 1 of 2 locations - an ultra light carbon airframe at only 125g (125g with camera isolation mount deck as per photos above), super-strong - flown outdoors in any wind condition - normally flown fast and furious blackout mini H Quad style - fitted with a PARIS AIR Hero v2 autopilot and has a PARIS return-to-home GPS - features an original Scarab style dead-cat mini profile with a full isolated front deck on 4 gell balls to carry an fpv camera The 3mm CF booms are ribbed to reduce drag by micro separation of the boundary layer under the props. There are no nuts - all M3 SS bolts screw directly to embedded M3 inserts - and all hardware is either Stainless Steel or Aluminium. The carbon used in the Knife is different - stronger - Also important was a flexible battery location for either sideways mount or longitudinal mount using a CarbonBird 3S2500 60C liPo.
LEDs Included - Includes RED/BLUE LEDs for racing or indoor ops - ?
I have a Phantom - can i fly this? truthfully, NO it's likely beyond your skills set level atm - True pilot-skills can be developed by using a realistic sim for a few weeks - the FPV Freerider SIM HERE - - dji robotics fly themselves and don't develop any human co-ordination skills that are transferable, as Franks phantom/naza was intended to be a plutonic robotic experience giving limited in-direct human control - dji never wanted you to fly - they use their robotics to handle 95% of the flying - bottom line, the truth is the Knife requires real 100% human-pilot skill on both sticks at the same time (relax - PARIS has bail-out self-level switch RTH when needed) - why is Knife so responsive? to roll quickly to 90° or 180° and dodge fast moving low level objects like trees, you will have to learn to control altitude/height (dji does it for you) if moving UP from phantom/naza flying - If you can fly the FreeRider Sim around the island obstacles in Acro mode - auto level OFF - without crashing, then you are ready to fly a Knife. If you refuse to learn pilot SKILLs - then you will be trapped in dji-alice-n-naza-land forever. A bridge has to be crossed - So we recommend to get the SIM connect it to your Taranis and learn co-ordination skills - within a few days solid on the Simulator you will have real life-long skills.
Social Group - consider joining the FB SCARAB-Club - this page is NOT run by us - it is a FB social site for Scarab Pilots to go as a "3rd Place retreat" and hang out with other pilots and shoot the breeze. - Don't just be a lurker - share your experiences with the group.
r2 AIRFRAME with extras
Downloads - The AIR comes ready to fly - but if you need to customise your setup, and are an expert (your risk) - the firmware is HERE for PARIS Air Hero v2
Assembly Instructions - the workflow is 1) build as per photos above 2) Calibrate/set your Tx settings to 1095/1500/1905 via MultiWiiconf GUI and test run without props 3) power test with props in hand held test (hand maiden) 4) hover test 5) final flight test by skilled pilot (if you are new to it use the SIM first) . Assembly -> basically it is very easy to screw together if you review the large photos above ; NO SOLDERING :) Instructions overview = Sharp carbon can cut wires and is conductive so, First thing, for the CF plates dull down the edges with a diamond file (not included) - the main areas to dull down are any sharp points which could puncture a LiPo in a crash, the GPS antenna hole, the places where wires will pass-thru - then warm the GPS to 100°C with a hairdryer so the heatshrink is soft - then push the top-plate down over the warm heat-shrink - it will then seat fully when soft - allow to cool for 10 secs in position in the frame - use 3 nylon screws; - then assemble as per the photos above above starting with attaching the motors to the booms with a short pair of M2*6 screws - you can use 4 screws if you prefer - but 2 is enough - front motors tilt backward, and rear motors tilt forward ; then attach the booms to the top deck. Then install the 4+4 stand offs - if you are not installing a 22mm FPV camera - in the lower centre - then you can run 22mm/25mm front & 30mm/30mm rears. If you want to install a bigger camera at the front then purchase 4 extra 30mm standoffs and run all 8 standoffs at 30mm fronts and 30mm backs too - Leave the lower deck until last after all the electronics and motors are fitted (see photos above for wire routing) - then attach the lower deck with M3 screws last.
Balance point - the geometric centre of a Knife is marked by the tips of the side spines - when held on the spines it should tip forwards slightly with everything installed and about to fly. The correct size battery is designed to be held in place by the friction of one piece of female velcro in the slots. If you decide to build at 30mm then use the velcro battery strap around the lower side -
Motor mounting - use the shortest screws for the motor mounts - 2 screws per motor - screws must NOT enter too far or they risk cuttting the motor winding wires ; also be sure to read the ESC; motor; battery limits - Full power/Full throttle cannot be held for more than 10secs
• Keep your Rx >75mm from any ESC. ESC produce switching noise interferance that you don't want going near your Rx, or your Rx antenna.
• Balance your motors if you want a superior machine for HD Video - see copper tape HERE (not included)
• Mount your RC Rx antenna at 45° on zip ties - Carbon will block RF signals even at short range unless the Rx antenna are well clear of the fuselage - make sure your failsafe is programmed and checked - see photos on our InstaGram page
• Test all motors and ESC by holding full power for 10 secs and then do a timed battery run at 50% throttle with props on (wear eye protection) in a hand-maiden test in ACRO mode - if any motor hesitates, shut down and see below - After a successful hand maiden check all ESC and motor temps <50°C stable - Archive note - with older BEC-ESC 12a, remove red wires now and Install the 5v micro uBEC as per photo/diagram above.
Question - Does it glide? Does it float? what happens if a wire(s) comes undone inflight - Answer = Quads DO NOT glide, and do NOT float - if any single wire is compromised (shorted or disconnected or over-volted), or battery is exhausted, or RC signal is jammed, or a prop breaks inflight from a previous crash, then your Quad will immmediately tumble to the ground - if you ever see this happen cut power to stop the motors/prop mid air before gnd contact. To prevent this from ever happening you need to be very clear about Risk - during assembly make sure every connection/wire/joint is correct - do not guess - do not assume anything - these issues can be safely found/tested during a hand-maiden where there is NO RISK - if you skip out the hand maiden (tethered test) then you expose yourself to risk - if you crash - stop don't fly - first check all wires and replace the crash props to remove risk - after intial assembly(or any later crash) do a functions test without props - test motor responses and RC control and test your failsafe, all done with props off. Then do a FULL-Power hand test for 5 secs (wear eye protection) called a hand maiden - this power test will confirm all power systems are working 100% correctly at WOT (wide open throttle for 5 secs). If any power system hesitates/stuttters or stops - then immediately cut throttle and shut down and do NOT fly - see below notes on how to find any problem in the power train.
Question - How Do I tell the left or right motors apart - they look the same? Answer = use the photo at right -> - hold the motor with wires coming towards you and shaft to the left - then see if the base is wider at the top (black Dot motor 4•1) or the base is narrow at the top (3•2)
Question - When i installed the Mobius and the 6"x4.5props they come very close to the Mobius? Answer = the include compression band should go over the rear 4-Balls Gello isolator - see photos - this does 2 things 1) tilt the Mobius up for better forward vision in fast flight 2) clears the props - = if your running this combo consider using the 5x4 Triples - ; or if your still having issues, use a prop balancer and cut 3mm off the tips and balance them up for the ultimate setup. You can also install the RePlay XD1080 which is a thinner camera superior to mobius ; Also Yi is even newer HDCam
Question - Knife PIDs ? What is the best starting point for PIDs? Answer = fly it the way it comes - We have pre-loaded the correct PIDS - don't reload code from the general AIR pages !! PARIS AIR have default PIDS for any Quad from 750mm size or 450 size - these PIDs are NOT tuned for the Scarab Knife 5x3 or even 6x45 or 6x3 props - so to see the BEST/Recommended PIDS - see the photo section above and set your gains to match the Airframe - in this case the Knife PIDs are above. Set these yourself using a oLED(AIR must be re-coded for oLED - see wiki for oLED) or your PC/Mac if you have a GPS - or a n Android phone you can use EZGUI APP - Then tune from there. PIDs are best left alone until your 10th flight.
Question - Motor care and set-up? - Routine maintenance every 5 hours flying (motors are ready to fly as supplied)
Posted by Lachlan Hayes on 31st May 2016
Have purchased, built and flown 2 of these, one with red motors, the 2nd with the Race Motors. The Race motors turning 6" HQ props running on 3S delivers a perfect trainer FPV race quad with plenty of performance to grow. Flies beautifully with no payload, flies just as well carrying an HD cam such as the Yi or GoPro. The only difference is a slight reduction in flight times due to the extra mass.
The build is well within the capabilities of most modellers with a bit of internet searching, the flight qualities are superb and the Quad is easy to maintain with the top plate being the "chassis".
Great product developed and supplied by an Australian supplier with great local support.
Posted by Hans Verkerk on 29th Nov 2015
I can't say enough positive things about the scarab 270, this is my second and I was very fortunate to have Quinton build and set it up for me. My first knife 270 I built myself and it took a hammering, as I had sustained spinal injuries and was slowly loosing my fine motors skills in my right arm and fingers. After explaining this to Quinton and asking for his assistance we agreed on a very fair price and I was again the very lucky and proud owner of a Scarab Knife 270 quad.. I can say that the service you get from all the staff at multwiicopter Australia is second to none, having been a customer for over 3 years now and couldn't be happier.
Posted by Gary on 19th Jan 2015
Posted by Martin Ward on 12th Nov 2014
I'm blown away guys. I had stupid 'operator not reading instructions' issues. The red USB cable provided with my knife 270 doesn't work, which didn't help. But I have been flying it today and I have a few issues - I should have bought ten battery packs!
Jeez it's fast, really fast, REALLY FAST. Wasn't really expecting it to be as fast as it is but I love it.
It crashes remarkable well and those crashes have been really fast crashes. Over my paddocks but good cartwheeling crashes. I'm yet to find even a scratch or bend a prop.
I can't wait to get this really dialed in. I have a few issues with I2C errors but I'm really impressed with the flight characteristics. It is so precise and controllable, so accurate in it's tracking and such a joy to fly. It is what I dreamed about, what I imagined a multi could be like. Many, many thanks. You are going to fulfill a lot of peoples dreams with the knife 270.
Posted by Tom on 12th Sep 2014
When I decided to get a mini quad I looked at all the options available and am really glad I went for the Knife. I have given the Knife some very serious abuse and it just keeps taking it. The Knife has enabled me to really push my skills in the knowledge that the only thing I am likely to break is props! The performance and balance is exceptional and has quickly become my go to Quad!
Posted by Andrew on 29th Aug 2014
I've only had the Knife for a couple of weeks now but man is it a nice little quad. Fast, agile, strong (yes, I've crashed it a few times pushing it hard and taking a few risks) and its the MOST fun I've had since I started flying FPV. Don't forget to buy lots of spare props and race it :)