-
Notifications
You must be signed in to change notification settings - Fork 0
2026‐04
Spearhead Call — Recording
Attendees: alperenag, zeynepb5793, kbmollysuh, errrks.eth, 21stCenturyAlex (briefly)
-
Control Surface Sizing (Zeynep)
- Flaperons (main wing): 20–25% of wing chord
- Tail control surfaces: 30–35% of chord
- Alperen's current tail design is at ~32% — within range
- Zeynep noted slightly larger is possible but diminishing returns; numbers are approximate minimums/maximums
-
Wing Build Progress (Alperen)
- Carbon fiber tubes received; test rib printed
- 8mm bearing issue: inner diameter matches tube outer diameter exactly with zero tolerance — bearings returned, 9mm ordered instead. Will use a thin 3D-printed sleeve between bearing and CF tube.
- Oratex covering material on hand
- Ordered: 4mm CF rod for trailing edge, 1.5mm balsa sheets for leading edge
- Once remaining materials arrive, ready to build first test wing
-
Control Surface Hinge Gap Problem
- Where the control surface meets the wing trailing edge, the wing interior is exposed (concave gap incompatible with Oratex heat-shrink)
- Options discussed: balsa sheet closure, CF sheet strips (top + bottom), leave empty for prototype
- Decision: leave the gap empty for the test wing — most online builds do the same. If aerodynamic effects are unacceptable (~1% drag increase expected), revisit with balsa or CF sheet solution
- KBM suggested silicone strip (window/door seal style) — noted as option
-
Servo Cable Routing — CAN vs PWM
- PWM cables from nose avionics to tail control surfaces would run ~2.5m through a noisy ESC environment — voltage drop and signal interference concerns
- CAN servos exist but are $300–350 each × 4 = $1,200–1,400 — too expensive for prototype
- Zeynep's solution: run CAN to the tail, then convert to PWM locally using either:
- A Here 4 GPS module (has internal PWM outputs when case is removed) — also serves as second GPS for GPS-based yaw
- A Matek CAN-to-PWM converter board (cleaner/smaller option)
- Erick: consider local voltage regulation at the tail rather than running low-voltage wire the full length — lower gauge wire for power, step down at the tail
- Alperen: can thicken the tail boom section to house a small electronics box or GPS
-
Electrical Layout Planning
- Alperen flagged that if the test wing works, structural design will wrap quickly → time to start planning electrical layout and component selection
- Not detailed design yet — just planning and connection mapping
-
Simulation
- Alperen will run structural and flow simulations
- Zeynep working on flight simulation — evaluating XFoil/XFLR5
- Potential test flight "a lot sooner than expected" if test wing succeeds
-
Open Items
- Alperen: build test wing with new 9mm bearings + materials (targeting next week)
- Alperen: draw clearer diagram of control surface hinge gap problem for team review
- Zeynep: finalize control surface sizing study output
- Zeynep: send Matek CAN-to-PWM adapter link to team
- Erick: begin thinking about tail electrical layout (local voltage regulation, CAN routing)
Spearhead Call — Recording
Attendees: alperenag, kbmollysuh, zeynepb5793, 21stCenturyAlex (briefly)
-
Wing Construction — Balsa + Oratex + 3D-Printed Ribs
- Alperen tested wet balsa over the weekend — very flexible and workable when wet
- Decision: balsa/Oratex/printed ribs is the best approach for prototype 1 (and likely prototype 2)
- Carbon fiber skin alternative would require a mold — aluminum molds ~$10,000; fiberglass molds $500–$1,000
- Prototype 3 may move to carbon fiber skin with aluminum or CF plate ribs
- Alperen building a test wing section by end of this week with the current materials
-
Local Manufacturing Resources (Ankara)
- Found a composite lab near TAI (in the tech hub area) specializing in UAV fiberglass and carbon fiber skins — good candidate for future prototype work
- Found a separate workshop making fuel bladders for aircraft and UAVs — potential future contact for fuel system if needed
-
GPS / CAN-to-PWM for Servo Control
- Need to drive 2 servos (control surfaces) from the flight controller over CAN
- Zeynep's research: the Here 4 GPS module has internal PWM servo outputs accessible by removing the case cover — up to 11 servo pins on the breakout pinout
- This would eliminate the need for a separate CAN-to-PWM converter board (Matek alternative was also identified)
- Plan: test CAN-to-PWM conversion on an existing Quiver setup in Texas or Germany (~1–2 hours of work with pre-written documentation)
- If it works → order a Here 4 for Ankara; if not → fall back to the Matek CAN2PWM board
- Dual GPS idea: one Here 4 in the nose cone + one in the tail (~2m separation), both RTK-capable — good for heading accuracy
- Zeynep to write up the test procedure and open a grant for the validation work; will consult Erick on wiring details
-
Simulation / ArduPilot QuadPlane
- Zeynep reading through ArduPilot QuadPlane documentation — familiar with copter firmware but plane/quadplane configs need more study
- Searching for similar hybrid VTOL builds for reference; few found (mostly fully 3D-printed, foam, or CF-molded)
- Both Alperen and Zeynep applied to DIY Drones forum for access to archived builds — neither approved yet
- Alperen found "Open UAV" project (Polish/Slovakian) — similar concept but website is dead; some posts exist on DIY Drones
-
Open Items
- Alperen: build test wing section with balsa/Oratex/printed ribs (by end of week)
- Zeynep: write CAN-to-PWM test procedure; open grant for validation in Texas or Germany
- Zeynep: continue ArduPilot QuadPlane documentation review
- Zeynep: consult Erick on Here 4 wiring/pinout details
- Both: follow up on DIY Drones membership approval
Spearhead Call — Recording
Attendees: alperenag, errrks.eth, zeynepb5793
-
Here 4 CAN-to-PWM — Clarified
- Two cables come out of the Here 4 case: one is CAN + voltage, one carries PWM/UART signals
- On Quiver, only the CAN cable is connected — the PWM cable is unused
- Connecting both cables to the breakout board gives access to PWM outputs — no need to open the case
- Alperen confirmed this with online research after talking with Zeynep; asked Thomas to check if his Here 4 package included a breakout board (doesn't remember seeing one). Julius doesn't have a Here 4.
- Open question: voltage mismatch — Here 4 runs at 5V, servos need ~7.8V. PWM signal amplitude is tied to source voltage, so feeding 7.8V to the servo while the PWM signal is 5V may not work. May need separate UBECs (one for Here 4 at 5V, one for servos at 7.8V). If 5V-only servos are required, they'd be larger and heavier.
- Erick to research PWM voltage compatibility this weekend
- Fallback: if Thomas can't test, Alperen and Zeynep can buy a Here 4 locally in Turkey (~$600 locally vs ~$300 US — "those scammers")
-
Importing Components to Turkey — Alperen spoke with customs: no import tax on sensors. European suppliers (HolyBro, Mad Motor Poland) ship easier and cheaper than China.
-
Test Wing Build
- Missed end-of-week target — design is done, parts ready
- All rib types designed: PETG-CF structural ribs, PLA LW control surface ribs
- Detachable hinge mechanism designed for tolerance adjustment
- Full technical drawing printed on 1m plotter paper — ribs will be placed at stations along spars, glued, then covered with Oratex
- Build happening this weekend
- Servo mount not included in test wing but location and linkage designed
-
VTOL Transition Algorithm (Alperen + Zeynep research)
- Hover → max gasoline throttle at zero pitch → accelerate to 1.2× stall speed → ArduPilot begins ramping down VTOL motors over 5s (configurable) while increasing pitch angle → wings progressively take over lift → pure horizontal flight
- Alperen's calculations: ~12 seconds transition with current drag/thrust estimates; real-world likely longer, worst case ~30 seconds
- Current engine thrust and drag estimates clear the transition requirements
-
Project Tracking — Zeynep raised concern about external visibility; GitHub Issues felt heavy for a 3-person team. Decision: use GitHub Discussions (like Quiver Mini) instead of Issues for open topics. Monthly progress report stays. Erick suggested Vector could help generate discussion posts from meeting transcripts.
-
AI Tooling — Alperen funding Claude subscriptions from Spearhead wallet for core contributors. Erick declines for now (claims it on taxes) but will take it up if needed. Alperen using it for design work; offering same to Zeynep.
-
Zeynep — Stability Tool + Transition Parameters — Work in progress; will present findings on Monday. Keeping in touch with Alperen on transition research between calls.
-
Open Items
- Alperen: build test wing this weekend
- Erick: research PWM voltage compatibility (5V signal → 7.8V servo)
- Alperen: ask Thomas to check for Here 4 breakout board in his kit
- Alperen: set up GitHub Discussions on Spearhead repo for open topics
- Zeynep: prepare stability tool + transition parameter presentation for Monday
- Zeynep: continue Here 4 CAN-to-PWM documentation
Spearhead Call — Recording
Attendees: alperenag, errrks.eth, zeynepb5793, kbmollysuh, thomasg
-
Here 4 Breakout Board — Resolved
- Two cables come out of the Here 4: one is CAN + voltage, one carries PWM/UART signals. On Quiver, only the CAN cable is used — the PWM cable exists but has been ignored.
- Connecting both to the breakout board gives PWM outputs — no need to open the case (confirmed by Alperen's research)
- Still waiting on Thomas to check if his Here 4 kit included a breakout board
- Julius confirmed he doesn't have a Here 4
-
PWM Voltage Mismatch — Solved
- Erick researched over the weekend: confirmed possible to run servos at different voltage (7.8V) from the PWM signal source (5V Here 4) as long as ground is shared
- Servos get their own power supply; PWM signal wire is separate
- Erick created a rough layout mockup
-
Custom Tail PCB vs Breakout Board
- Erick proposes a custom PCB for the tail: integrates voltage regulation (5V for Here 4, 7.8V for servos), CAN input, PWM breakout — cleaner than stacking UBECs and a breakout board
- Simple 2-layer PCB (maybe more for signal routing)
- Lead time shouldn't be an issue — no exotic components
- Fallback: for first VTOL-only test flight, can use breakout board with cables spliced together (servos underpowered but functional)
- If no breakout board exists in Thomas's kit → PCB becomes top priority
-
Turkey Import Logistics — No import tax on sensors. European suppliers (HolyBro, Mad Motor Poland) ship easier/cheaper than China. Here 4 costs ~$600 in Turkey vs ~$300 in US. Alperen spoke with customs broker.
-
Test Wing Build — Design complete; all ribs designed (PETG-CF structural, PLA LW control surface). Alperen covering the leading edge with wet balsa during the call — very hands-on. Balsa drying overnight; wing build should be done tomorrow. Forum thread created for photos/updates.
-
First Flight Timeline — Official target: end of June. Optimistic: end of May. Thomas: "End of May would be incredible."
-
Zeynep — QuadPlane Reference Guide Presentation
- Comprehensive walkthrough of ArduPilot QuadPlane configuration, compiled from official docs with irrelevant frame types (tailsitters, tiltrotors) removed
- Key topics covered:
- Setup: Q_ENABLE=1 loads all QuadPlane params; Quad-X motor layout recommended
- Building tips: frame rigidity critical, motor clearance for downwash, wing downforce adds to hover thrust requirement
- Motor alignment: even 1–2° misalignment severely limits yaw authority at QuadPlane scale (worse than on Quiver due to larger inertia). May need intentional yaw-biased motor tilt.
- Transition VTOL→Fixed-wing: hover → max IC throttle → accelerate to 1.2× stall speed → VTOL motors ramp down over 5s (Q_TRANSITION_MS) → pure forward flight. IC engine running at idle during hover (~1800 RPM — adds vibration + slight thrust)
- Transition Fixed-wing→VTOL: IC engine stops immediately, VTOL motors engage, control surfaces maintain stability during decel, pitch limited to prevent violent pitch-up
- Assistance modes: VTOL motors auto-engage if airspeed drops dangerously, attitude error exceeds threshold, or altitude gets too low
- Weather vaning: auto-aligns nose into wind using attitude corrections (not pitot tube or GPS data — dedicated algorithm based on roll/pitch corrections)
- Flight modes: Q_Stabilize, Q_AltHold, Q_Loiter (VTOL); FBWA, FBWB (fixed-wing); auto missions with VTOL takeoff/landing
- Level calibration: must be done on the aircraft (not bench) — only affects displayed angles, doesn't require full IMU recalibration
- SITL: software-in-the-loop simulation available in ArduPilot — can input approximate physical dimensions for pre-flight testing
- Alperen: 3–5° forward VTOL motor tilt is a good idea — gives incidence angle for wings during hover, smoother transition
- Pitot tube: one is sufficient; Alperen found the original Spearhead pitot tube in a drawer
- Alperen converted presentation to markdown (via Claude) for repo upload
-
GitHub Discussions — Alperen created a forum thread for the test wing build under Spearhead Forum
-
Turkey Customs for Quiver — Thomas offered to consolidate orders through Texas. Customs broker says they'd reject it — importing drone components without a certified assembled drone raises red flags. Building from parts requires certification Turkey doesn't have a path for.
-
Open Items
- Alperen: finish test wing (balsa drying; build tomorrow); post photos to forum thread
- Alperen: incorporate 3–5° VTOL motor forward tilt into structural design
- Alperen: check original Spearhead pitot tube model/compatibility
- Alperen: upload Zeynep's QuadPlane reference guide (markdown) to repo
- Erick: continue tail PCB design; create detailed layout
- Thomas: check if Here 4 kit includes breakout board
- Zeynep: upload CG allocation code to GitHub
- Zeynep: try ArduPilot SITL with approximate Spearhead dimensions
- Zeynep: consider IC engine idle thrust/vibration in hover analysis
Spearhead Call — Recording
Attendees: alperenag, errrks.eth, kbmollysuh, thomasg
-
IC Engine Consultant Found — Alperen visited a model aircraft shop in Ankara and connected with a hobbyist/worker who has deep knowledge of engines at Spearhead's scale (carburetor tuning, mix ratios, etc.). Offered consultancy; the guy declined formally but gave his phone number and is happy to help informally. Huge knowledge gap filled — Alperen has "0% experience" with carburetor engines.
-
Engine Sizing — Can go up to 55cc instead of 35cc. Plan: buy both sizes and test during transition phase. No fuel consumption charts available for these engines — will have to measure empirically. Engines are aviation-specific (model aircraft), full aluminum casting, direct propeller shaft output, internal gearbox.
-
Test Wing V2 — V1 failed (balsa cutting issues). Alperen bought new balsa sheets from the model shop. Found a new laser cutter — the workshop that made Arrow's signboard. Laser cutting tomorrow, wing build over the weekend. Version 2.
-
Motor Research (Erick) — Alperen asked Erick to research electric VTOL motors and ESCs. Requirements: ~5.5–6kg thrust per motor, auto-center feature (important for cruise flight). Mad Motor option is good but expensive — looking for alternatives. Need to order soon due to Turkey customs lead times.
-
Here 4 Testing — Zeynep prepared a test procedure but won't be available until next Wednesday. Erick to review and provide input if needed.
-
Thomas Visiting Ankara — Thomas planning to visit Alperen for about a week before a European vacation with his brother. "You, me, 10 kilos of baklava, some laptops, and Claude." Erick has FOMO but can't make it (extra trip end of May already).
-
Stork 1 Component Ordering — Alperen starting to order components for the first prototype build.
-
Open Items
- Alperen: laser-cut balsa + build test wing V2 (this weekend)
- Alperen: begin ordering Stork 1 components
- Erick: research VTOL motors + ESCs (5.5–6kg thrust, auto-center)
- Erick: review Here 4 test procedure (Zeynep's doc)
Spearhead Call — Recording
Attendees: alperenag, errrks.eth, kbmollysuh, thomasg
-
Balsa Ribs Laser-Cut ✅ — Alperen finally got a laser cutter shop (the same place that made the Arrow signboard). Results: extremely light, durable, 5mm thick. Will reuse CF tubes from V1 after cleaning epoxy residue.
-
3D Printing Marathon — 67 parts total for Stork 1 (the first prototype). Print times range 2–13 hours each. Printer running nonstop; ~30% of large parts done. Estimated 10 days to complete all prints.
-
Motors & ESCs Ordered — Alperen ordered the VTOL motors and ESCs today. Continuing to order remaining components. Erick asked to prioritize motor/ESC research for alternatives this week so they can finalize and order next week (customs lead time concern).
-
Fuselage Design Progress
- New fuselage sizing with IC engine modeled from technical drawings
- Cylinder must stay exposed for air cooling — NACA inlet would add drag and be less effective than direct airflow
- Problem: exhaust pipe blocks the cylinder cooling fins. Solution: elbow tube to redirect exhaust to one side
- Aft fuselage angle is aerodynamically sharp but acceptable for prototype — smoother CF/fiberglass skin in later versions
- Skin around engine area: aluminum foil tape (Oratex and PA6-CF won't handle the heat)
- Truss beam structure for fuselage — preliminary tube sizing done (longitudinal, vertical, diagonal) based on hand calcs, no FEA yet
-
Engine Cooling Analysis
- Heat generation: ~2kW; heat dissipation via 25 m/s airflow: ~1.6kW
- Marginal but likely sufficient (conservative estimates used)
- KBM suggested Venturi tube ducts — Alperen prefers trying exposed fins first, duct as backup
- Will evaluate after transition and cruise flight tests
-
Alternative Engine — 35cc with Electric Starter + Generator
- Found a 35cc engine with embedded electric starter, generator, but liquid-cooled (2kg cooling system, 5.5kg total)
- Without cooling system it would be perfect — but liquid cooling not practical for this build
- Adding aftermarket starter + generator to the air-cooled engine estimated at 1.5–2kg
-
Wing-to-Boom Connection — Alperen researching the structural connection between the non-detachable wing section, VTOL booms, and detachable outer wing. More challenging than the wing-fuselage joint. Will sketch solutions after fuselage truss design.
-
Here 4 Test — Zeynep not available until Wednesday. Erick to coordinate with her then.
-
Erick Moving — Last weekend in Bay City; moving to Houston-area house on Saturday. Busy week ahead.
-
Thomas Visiting Ankara — Dates confirmed with Alperen. Thomas visiting before European vacation. Alperen: "It's gonna be a real man cave."
-
Open Items
- Erick: research VTOL motors + ESCs (priority — need selection this week for ordering next week)
- Erick: coordinate Here 4 test procedure with Zeynep (Wednesday)
- Alperen: clean CF tubes from V1; build test wing V2 with laser-cut balsa ribs
- Alperen: continue 3D printing Stork 1 parts (~10 days)
- Alperen: design fuselage truss structure; sketch wing-boom connection box
- Alperen: continue component ordering for Stork 1
Spearhead Call — Recording
Attendees: alperenag, errrks.eth, zeynepb5793, kbmollysuh, coolride_001
-
Stork V2
- Zeynep reviewed the Stork manual and started a BOM comparison
- Battery choice is still under review; Zeynep initially leaned 4S but now thinks 6S may be better
- The originally desired flight controller is hard to find / possibly discontinued
- Candidate replacement: Matek Wing 1 / Wing 2
- Zeynep says the autopilot parameters are mostly compatible; main changes are pinout/calibration parameters
- Downside: soldered wiring/no easy connectors
- Decision: Alperen will order one Matek Wing 2 for Stork
- Alperen is printing Stork parts continuously and expects printing to finish next week
- Thomas will be in Turkey around May 12, leaving roughly 2.5 weeks for build readiness
- PLA Aero is being used for current parts because ASA Aero arrived later; PETG-CF likely for structural parts where manual suggests PC/PETG
- Team noted sun/UV exposure can damage printed Stork parts; reprinting cheap parts in ASA Aero may be easier than coating
-
Spearhead Fuselage / Structural Layout
- Alperen showed a new fuselage shape
- Engine cylinder must stay exposed to incoming airflow for cooling
- Oratex skin limits curved/aesthetic shaping in this prototype phase; future carbon-fiber skin could allow a cleaner aerodynamic shape
- Fuel tank target is around 6 L under the wing section
- Battery is being placed near center of gravity
- Electronics may fit above/around the wing connection area
- Two main spars from each side and the center boom converge near the wing/fuselage structure
- Alperen started designing the structural connection element; likely CNC-machined aluminum for the initial prototype
- Carbon tubes are 2 m industry-standard length; longer custom tubes would add cost/complexity
-
VTOL Motor Forward Tilt Clarification
- Erick asked whether the 3–5° VTOL motor forward tilt is fixed in the structure or only experienced during transition
- Clarification: the motor/boom assembly will have a fixed structural forward tilt relative to the aircraft
- On the ground and during hover, the aircraft sits/holds a nose-up attitude so the VTOL motors remain effectively parallel to the ground
- During transition, the fixed tilt helps avoid producing a rearward thrust component when the aircraft needs angle of attack and can assist forward acceleration
- During cruise, VTOL motors are locked/off and loads should be minor
- Tradeoff: the tilt brings propellers closer to the ground, so landing gear may need to be slightly longer
- Team wants an attachment/interface provision under the fuselage for cameras or payloads because Oratex skin is not a sturdy place to tape hardware
-
Grant / Powertrain
- Zeynep has a grant baseline ready and incorporated Erick's feedback
- Erick reviewed options around 12S and the target KV range; KDE, T-Motor, Eagle Power, DualSky, etc. are generally expensive
- Mad Motor option looks affordable and convenient, especially with matched AMPX ESC
- Propeller positioning / auto-centering is important
- Candidate KV options discussed: roughly 135 / 150 / 165 KV
- Team leans toward 150 KV as a balance of efficiency and hover throttle; Zeynep will check alternatives before Monday
-
Open Items
- Alperen: order Matek Wing 2 for Stork
- Alperen + Zeynep: finalize Stork BOM / 4S vs 6S decision
- Alperen: finish Stork printing and prepare build with Zeynep
- Alperen: continue Spearhead spar/boom structural connector design; consider CNC aluminum prototype
- Zeynep: send Spearhead grant baseline to Alperen before posting
- Zeynep + Erick: review powertrain options, especially 150 KV motor + ESC fit
- Erick: help with Matek pinout mapping if Zeynep needs it
Spearhead Call — Recording
Attendees: alperenag, errrks.eth, thomasg, zeynepb5793, kbmollysuh
-
Stork V2
- Alperen and Zeynep had a long session Friday and ordered essentially all needed Stork components: VTOL equipment, battery, 6S charger, and other aircraft parts
- Printed structure is still in progress
- Alperen is running out of PLA Aero mid-print and may finish remaining sections with ASA Aero
- Remaining structural prints after PLA/ASA Aero should be PETG-CF and take roughly a day
- Parts started arriving April 27; Alperen expects most/all parts by Thursday
- Build can start once prints and components are ready
- Alperen will reach out to Ankara RC/model-aircraft groups to ask about available test sites/runways; this could also help Spearhead later
-
Spearhead Structure
- Alperen spent the weekend iterating on structural design and changed direction multiple times
- Current direction: switch to square carbon-fiber tubes for wing spars and VTOL booms instead of round tubes
- Benefits: better bending behavior, VTOL motor tilt becomes less of a concern, and spar size/weight may be reduced
- Tradeoff: wing detachment mechanism is harder than with round/sliding tubes
- Exact nested/tight-fit square tube sizes are not available, so Alperen is exploring a different detachment mechanism
- Supplier found: compositeshop.com.tr
- Rationale: prototype uses Oratex skin, which should not be counted as load-bearing; round tubes do not extend top-to-bottom like an I-beam/wing-box structure would
- Approximate design load discussed: wing root moment around 240 N·m after safety factors
-
Motor / ESC Selection
- Team compared T-Motor vs Mad Motor options
- Preference settled on Mad Motor: slightly more expensive but lighter and likely more efficient
- Around 20 g lighter per motor than one alternative; 80 g total across four motors
- Decision: order 6 motors — four required plus two spares
- Selected Mad Motor AMPX 80A DroneCAN ESC for the VTOL motors
- Reasons: reasonable price, DroneCAN support, documentation available for CAN setup, and matches motor/test specification package
- Erick will start sizing the electrical/harnessing system around the selected ESC and motor
-
Propellers
- Fixed propellers, not folding propellers
- Reason: propeller positioning/locking matters; folding props may spin/behave poorly in forward-flight airflow
- Recommended prop size/model appears to be 26 x 7.8
- Propellers are expensive (~$200/pair for the initially checked option)
- Lightweight carbon prop option saves roughly 20 g per prop / 80 g total across four props
- Decision for now: start with the cheaper/heavier propellers during initial testing because they may break anyway
- Keep the ultra-light prop option as a future weight-reduction lever in early August
-
Motor Wire Cutting / Enamel Issue
- Alperen raised concern from a Feather failure where motor wires burned after cutting/shortening
- Erick clarified likely cause: motor wire strands may have enamel/clear coating
- If cut and re-terminated without removing coating, resistance/heat can build at the connection
- If Spearhead motor leads are shortened, inspect for enamel coating and remove it properly before connector/solder interface
- Erick will look for the old Feather PC3 failure analysis notes/spreadsheet
-
Open Items
- Alperen: finish Stork prints and begin build once parts arrive
- Alperen: contact Ankara RC/model-aircraft groups about test/runway sites
- Alperen: continue square-tube Spearhead structural redesign and detachment mechanism
- Zeynep: send Spearhead grant document to Alperen
- Alperen: create grant and order Spearhead VTOL powertrain components
- Alperen: post selected motor/ESC/prop choices to the VTOL Propulsion System forum
- Erick: start sizing Spearhead harness/electrical system around Mad Motor + AMPX 80A ESC
- Erick: find old Feather PC3 motor-wire/enamel failure notes
- Alperen + Erick: inspect/remove enamel if shortening motor leads
- Vector: remind team in early August to revisit ultra-light propellers as an ~80 g weight reduction