Rotor 235 · parts and equipment
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Exact Rotor purchase and measurement checklist
Unpowered measuring package. The operating mechanical design is not complete: shaft-stack, gear-mesh, swash and boom dimensions are still required.
Quantities are installed unless marked as workshop/fixture. Confirm the exact version, availability and delivered hardware before buying. Earlier generic gear/axle and regulator proposals are superseded below.
| Quantity | Item | Specification | Source |
|---|---|---|---|
| 1 | Spirit GT controller | With Spirit primary SRXL2 adapter; no powered mechanical setup yet. | Manufacturer / specification |
| 1 | Spektrum SPM4651T | Primary SRXL2 receiver, compatible with the selected adapter and NX8. | Manufacturer / specification |
| 3 | KST DS215MG V8 | Cyclic servos; 6–8.4 V, 1520 µs/333 Hz. Use 6 V bus; load budget remains unmeasured. | Manufacturer / specification, Manufacturer / specification |
| 1 | Hobbywing Platinum 25A V4 | 30204200 / manufacturer alternate 30215001; 47 ×22 ×10 mm, 27 g; 6 V BEC3 A continuous/7 A peak. | Manufacturer / specification |
| 1 | Hobbywing XRotor10A Mini 3S | 30901008; legacy availability. Regular PWM tail motor controller; exact firmware/interface test required. | Manufacturer / specification, Manufacturer / specification |
| 1 shaft and collar | Main-shaft set | BLH1506. 2 shafts, 1 locking collar and set screw Exact shaft geometry is unmeasured. Do not print this shaft. | Manufacturer / specification |
| 2 bearing positions shown in exploded drawing | Main-shaft bearings | BLH4515. 3 bearings, 4 x 8 x 3 mm 4 mm ID / 8 mm OD / 3 mm width. Drawing p 19 shows two callout-27 rings; pack quantity is three. Stock and final installed count must be checked against the mechanism. US source showed backorder; no substitute specified. | Manufacturer / specification |
| 1 | Main gear and fixing hardware | BLH1402. 1 main gear, shoulder bolt and locknut Module, tooth count, bore, thickness and shoulder-bolt geometry not published in reviewed sources. | Manufacturer / specification |
| 1 | Motor pinion | BLH-1785. 1 13-tooth pinion and set screw Tooth count is verified; bore/module/mesh-center spacing are not. | Manufacturer / specification |
| 1 | Aluminum rotor-head block | BLH-1773. 1 head block, shoulder bolt and locknut This is NOT a complete assembled rotor head. The following spindle, dampers, grips, bearings, links, blades and bolts are separate. | Manufacturer / specification |
| 1 | Feathering spindle set | BLH1502. 2 spindles, washers and hardware; product table lists 2 washers Use OEM spindle retention hardware and verify packet against exploded assembly; no generic bolt substitution specified. | Manufacturer / specification |
| 2 | Head dampers | BLH-1774. 2 dampers | Manufacturer / specification |
| 2 | Blade grips | BLH4502. 2 grips, link balls, shims and bearing spacers Bearings are a separate SKU. Do not print the blade grips. | Manufacturer / specification |
| 1 full head kit | Blade-grip bearing kit | BLH4504. 4 radial bearings, 2 thrust bearings, 2 shims Bearing stack orientation and spacer fit must follow assembly documentation; no dimensioned bearing-stack drawing found. | Manufacturer / specification |
| 2 depicted head links | Head pitch links | BLH1504. 4 links Set contains spare links; two linkages appear in Revolution p 19 drawing. Verify final mechanism. | Manufacturer / specification |
| 1 | Aluminum swashplate | BLH-1775. Swashplate including linkage balls and anti-rotation guide pin | Manufacturer / specification |
| 1 pair | Main rotor blades | BLH1503. Pair of white rotor blades Use purchased matched blades. No printed rotor blades in this proposal. | Manufacturer / specification |
| 2 bolts and 2 locknuts | Blade fixing hardware | BLH4503. 2 bolts and 2 locknuts Bolt dimensions/grade not supplied; use the specified OEM set. | Manufacturer / specification |
| 3 | Cyclic servo links | BLH-1780. 3 threaded rods and 6 ball links | Manufacturer / specification |
| 1 | Swashplate anti-rotation bracket | BLH-1783. Bracket with 2 M2x6 screws Recommended purchased guide for first printed-frame mechanism. A printed replacement still needs exact pin clearance and travel measurements. | Manufacturer / specification |
| 1 | Tail boom | BLH-1776. 1 boom Purchased straight boom is baseline for frame study. OD, length, material and hole/index details are not published in reviewed page. A printed-boom replacement would be a separate stiffness/vibration design and test scope. | Manufacturer / specification |
| 1 | Tail motor mount | BLH-1777. Mount; 4 M2x4 screws, 2 M2x6 screws, 6 washers Recommend buying this small mount rather than guessing tail motor bolt spacing; frame/boom interface still must be measured. | Manufacturer / specification |
| 1 | Tail rotor hub | BLH2020. Aluminum hub, 2 set screws, 1 fixing screw, 1 flat washer | Manufacturer / specification |
| 1 | Tail rotor | BLH1404. 2 tail rotors, washers and hardware One rotor used; second spare. Verify overlap with hub hardware instead of installing duplicate washers. | Manufacturer / specification |
| 1 | Main brushless motor | SPMX-1083. 1 3400 Kv brushless outrunner Manual identifies 14 poles. Published mount pitch, shaft diameter and mass were not found. | Manufacturer / specification |
| 1 | Tail brushless motor | BLH1515. Motor with leads and 2 mm bullet connectors 3600 Kv. Need one motor; product-page quantity wording is inconsistent. Mount pitch, screw engagement and mass unverified. | Manufacturer / specification |
| 1 | Flight battery | SPMX8503S30. 3S 11.1 V 850 mAh 30C Smart G2 LiPo, IC2 65 x 30 x 23 mm; nominal 75 g, not a complete custom-helicopter mass estimate. Final CG and load capability require testing. | Manufacturer / specification |
| workshop | S100 Smart charger | SPMXC2090. S100 charger plus USB-C cable Needs SPMXCA320 for IC2 battery and a suitable USB-C power supply. | Manufacturer / specification |
| workshop | IC3-to-IC2 charge adapter | SPMXCA320. 1 adapter Use at the charger; the flight power harness needs a correctly polarized IC2 device connector because the selected main ESC has no battery connector supplied. IC2 is not EC2. | Manufacturer / specification |
| workshop | 65 W USB-C power supply | SPMX-1027. Power supply and USB-C cable Only if no suitable supply is owned. Alternative SPMXC2090P bundle replaces separate charger/supply purchases. | Manufacturer / specification |
| 1 | Custom battery/ESC input harness | Correctly polarized IC2 device-side connector for the selected pack, splitting only the input supply to both ESCs. Size and verify leads/connectors against measured motor current; do not assume the bare main ESC includes this harness. | |
| 1 | OEM motor mounting plate | BLH-1781 includes four M2×6, two M3×6 and washers. Its attachment pattern must be measured for the printed frame. | Manufacturer / specification |
| 4 | Measuring-fixture base bolts | M3×10–12 with washers/nuts; measure stack and elevate fixture on stable blocks if nut/bolt ends extend below its base. | |
| 4 | Measuring-fixture cap screws | M2×12 with washers/nuts. Do not compress bearing inner races. |
For unchanged carbon/wood members, retaining hardware, servo linkage lengths and materials, also use the source cut lists and drawings linked in the build guide. Fit all actual ends before marking rods; do not treat a viewer centerline as a bare rod cut length.
Added to the mechanical measuring kit
Buy one BLH-1793 servo horn/link-ball set and one BLH-1778 tail fin. Keep the KST-supplied servo arms. The Blade ball retention and KST horn thickness need measurement; the OEM horn spline is not a confirmed KST fit.