Quad/OCTA 175mm SCARAB Airframe The following is the recommended building tips for assembling the airframe. Allow three days.
Quad/Octa SCARAB is designed for 18 amp ESCs x 4 - preferrably running 4S 775kv Motors are best between 35g - 75g Wires - 20AWG wires LiPo 150-220g 4S 9050Triple bladed PROPS guide VERSION 1.0.5 SCARAB is designed to sacrifice the frangible booms in the event of a crash and save the motors,electronics and the mainframe from impact G forces. Thin rounded booms are very streamlined to prop wash and gives longer flight times of 12-15mins. We expect the removable boom to be used in most cases - for travel and for modular replacement reasons. good connections are vital. If a single connector fails or comes loose - your Quad will crash - double check each one BOOM LENGTH - Build light -> to fly - cut booms down to suit motors - small motors (30g) can be longer - Medium (50g) 230mm - heavy motors(70g) 210mm - it’s common sense - long booms with heavy weights will resonate - 230mm(default) is a good average length choice. Booms can be cut with a dremel , a band saw or an aluminium blade on a carpenters power-drop saw. Balance props perfectly on a magnetic balancer. then dynamic 9running ) balance them. Mounting - medium/large Motors (55-80g) mount below the shaft to counteract gyroscopic forces - see sample at left. wiring - first decide if you want removable booms/ plugs. or if you want to solder the wires to the ESC? Solder wires cannot come loose - but can be less suitable for Travel-AP - so each pilot takes his own Risk. solder wires are more reliable - but all wires must be checked before flight. If you crash - never fly immediately. Inspect all wiring very carefully.
one wire above, right side
version 1.0.5
SCARAB QuadOcta Airframe guide
counter sink two match hole in the engine mount - each motor is different - if Align the wires to the shaft side of the key shape - thread one wire above and 2 wires below. Attach the motor - use Loctite on the screws and also on the shaft lock screw. Slide the carbon boom over the completed assembly including the wires - be sure not to cut the wires on the carbon shaft ! www.MultiCopterPilot.com
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THIN Cyno-acrylic glue (HobbyKing superglue) Composite structure - Bond the two parts of the engine mounts - use baking paper on the work surface - Parts comes pre-press fitted - using a thin-nozzle aplicator apply lines of thin Cyno on each of the 4 sides of each mount Thin Thin and allow to wick-in. Allow to dry CYNO CYNO fully - do NOT insert the mount while superglue is wet. Wait 24 hrs if you Thin Thin CYNO do not have accelerant spray. If using CYNO Accerant spray wait 10 mins to allow it Internal wires 20AWG Thinner wires fibres first. Internal wires 18AWG to soak fully into the Thicker wires 2x15mm button head bolt
#2x7/16th Servo Screw - as supplied
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top
70°
70° 30°
30°
dry-fit the motor mounts - mark carefully drill a 2.0mm hole - at remove the holders - note the rim of the tube is cut the hole 7.5mm from the end of the a shallow angle of 30° to the main engine plate smooth inside to feed wires boom at a shallow angle of 30° Use 20AWG wire - average is 3-7 amps per engine in hover
use small drop of loctite on the M3 engine bolts - do NOT get loctite in bearing!! Small drop only
place wires along holder slowly feed the boom over the wires checking for fit
Do not pull the wires - note wires can be damaged inside the motor if pulled or cut Internal wires 20AWG Thinner wires #2x7/16th Servo Screw - as supplied
Internal wires 18AWG Thicker wires 2x15mm button head bolt
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top
70°
70° 30°
version 1.0.5
SCARAB QuadOcta Airframe guide
Screw must be cut to 7-8mm or it will penetrate into the lower right quadrant.
30°
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Make a power distribution lead - 5 wires (the fifth wire will be for LEDs/ BEC supply)
use a piece of heat shrink to hold the wires - then solder so it can fir inside the XT60
use a piece of heat shrink to hold the wires - then solder so it can fir inside the XT60
slide some 5mm heatshrink onto the multi’s before you solder the posts - note that the temporary heat shrink is then removed - before sliding the final 5mm down
version 1.0.5
SCARAB QuadOcta Airframe guide
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finished power lead - the LiPo will have the male connector - shown for clarity here
Learning the Throttle curve - After setting your Tx to 1095/1500/1905 in the GUI - do the ESC throttle learning curve - To calibrate the ESCs as a group build a multi harnes - a Y lead - then connect the actual Rx, one engine - with Throttle at full on the Tx then connect the ESC wiring loom - after two beeps reduce the throttle to idle - 3 or 4 beeps (3S or 4S) then power off everything. Done
fit the six boom mounts to the lower side - 3 of the mounts use the longer 2*10mm screws - fit these finger tight only - the front landing gear goes behind the front booms
screw the lower mounts POSTS to the mid-deck floor - the holders only fit one way - DO NOT TIGHTEN yet - then lower the blue (or red) holders in place over the posts. Loose only.
NOTE : SS M2 button heads have small shoulders and can strip with a M1.5 hex - be sure to USE the 1.57mm L HEX provided in the kit - 1/16th “ inch version 1.0.5
SCARAB QuadOcta Airframe guide
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fit the four ESCs as shown here we recommend you use the 2mm banana plugs provided attach the wiring loom made previously - Use two 2*6mm hex heads to hold the booms inplace while you finish this stage
install the optional cross beam for additional structural support (optional item)
install the 4 centre shafts - these are used to brace the frame in the HEX sections not filled by a boom holder
version 1.0.5
SCARAB QuadOcta Airframe guide
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PARIS - the PARIS is ideally mounted to the top centre - BE AWARE of static - mixed clothing - wool/nylon jackets can build up large static charges which will fry your control electronics in an instant ZAP when you go to pick your SCARAB or PARIS up. !!! Static will also be generated in-flight by props. Route the engine lines to the rear use only nylon mounting screws and stand-offs so as to allow the forces to be absorbed in a serious crash and not break the electronics themselves. Be aware that the PARIS BARO must remain 100% dry at all times. Even one drop of water entering the Pitot-static port on the BARO can ruin the device and short the BARO internally - KEEP DRY
Gear - one leg installed
version 1.0.5
SCARAB QuadOcta Airframe guide
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Gear - use10mm M2 bolts - you must use the SCARAB pro-TOOL 1.57mm - DO NOT use a 1.5mm hex Fit the Velcro and the battery strap provided
Gear - all gear installed
GoPro - the goPro will have the effect of moving the CofG forward. The LiPo will therefore be mounted rearward to compensate - adjust to get the Cof G slightly FORWARD of centre.
version 1.0.5
SCARAB QuadOcta Airframe guide
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version 1.0.5
SCARAB QuadOcta Airframe guide
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#3 5°
FRONT
5°
#10
5° #9
5° #11
MOTOR tilt - we designed the SCARAB system to use motor tilt - in a Quad X the engine 3 & 9 are tilted 5° clockwise (viewed from the end of the boom looking inward) and engines 11 & 10 are rotated 5° CCW - this gives positive YAW control for Aerial photo Ops with very little RPM change required ALSO allows the pilot to trim the neutral YAW position in hardware - not on the Tx.
5°
5°
11 & 10 are rotated 5° CCW viewed from each end
version 1.0.5
SCARAB QuadOcta Airframe guide
3 & 9 are tilted 5° clockwise viewed from each end
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Go Pro tilt - You can run your GoPro upside down and set the mode to upside down in the GoProUserMenu - we recommend 720p/60fps. The custom aluminium mount requires some hand filing of the sharp edge on the inside radius of the female slot to allow downward tilt - keep the mount very firm with NO PLAY - Balancing props is essential to removing the Gello Effect of the rolling-shutter CMOS chip in the GoPro - (optional articulated mount shown - not included) 1.57mm 1/16” L tool ; or SCARAB frame TOOL NOTE : do NOT use 1.5mm metric heli tools !
NOTE : Carbon can block 2.4Ghz RF run your Rx antenna well clear of the carbon plates - do a range check!
NOTE : GoPro Mount Assemble as per this photo - drill a 2mm hole and apply a bolt or screw to secure it
LiPo - we recommend a combo of Velcro and the strap - Use a Quannum Telemetry cell monitor to land when the first LiPo cell is 3.3v. version 1.0.5