Introduction: An RFQ package with 10 information blocks helps efoil buyers reduce quotation ambiguity across CAD, materials, interfaces, finishing, inspection, quantity, and delivery.
A CAD file describes geometry, but a supplier quote also depends on material condition, critical interfaces, surface treatment, inspection evidence, quantity, packaging, and the intended production stage. If those details are missing, a supplier may price a different process, assume a different finish, omit an inspection requirement, or discover late in the project that a component must be assembled with parts that were never included in the quotation.
This matters especially for hydrofoil and efoil components. Masts, fuselages, mounting plates, motor interfaces, cable passages, and sealing faces often sit inside a compact system where a small mismatch can affect assembly or rework. Fanxi Tech’s public efoil component and supplier-vetting pages describe this kind of work as a connected manufacturing and integration problem rather than a single machining transaction.
A complete RFQ does not need to be long for its own sake. It needs to make the commercial and technical boundaries visible. The structure below gives product, engineering, and procurement teams a practical way to prepare a quotation package without turning the first supplier conversation into an uncontrolled exchange of assumptions.
| RFQ block | Information to provide | Decision it enables |
|---|---|---|
| Project context | Application, product stage, use environment, and reason for sourcing | Helps the supplier interpret risk and recommend a suitable process |
| Part identity | Part number, description, revision, quantity per assembly, and drawing status | Prevents version and scope confusion |
| CAD and drawings | 3D model, 2D drawing, assembly view, datum scheme, and critical-feature markup | Defines geometry, tolerances, and the features that control fit |
| Material | Alloy, temper, heat treatment, certificate needs, and alternatives allowed | Prevents substitutions that change strength, weight, or finishing behavior |
| Manufacturing notes | Thin walls, deep pockets, threads, bores, welds, masking, and difficult-to-machine features | Lets the supplier price and plan the actual process |
| Surface and corrosion | Anodizing, coating, blasting, passivation, color, thickness, sealing, and marine exposure | Connects appearance and corrosion requirements to functional surfaces |
| Quality and inspection | First article, CMM, reports, sampling, traceability, NDT, and acceptance criteria | Defines the evidence required for release |
| Volume and timing | Prototype quantity, pilot lot, annual forecast, order pattern, target dates, and ramp plan | Allows realistic capacity and lead-time planning |
| Assembly and logistics | Kitting, sourcing, packaging, labeling, delivery terms, and storage assumptions | Prevents hidden scope and damage risk |
| Commercial and data controls | NDA, drawing ownership, change process, tooling, payment, and quote validity | Protects the project while making the quote comparable |
The first paragraph of an RFQ should tell the supplier what the component does and where the project sits. State whether the request concerns a proof-of-concept, functional prototype, pilot build, replacement part, or production program. Identify whether the system is intended for freshwater, saltwater, or mixed use, and note whether the part is structural, cosmetic, sealed, or connected to a motor or battery-related assembly.
The same geometry may require different controls depending on whether it is a one-off development part or a repeat production component. A prototype may prioritize fast feedback and design iteration. Production may prioritize repeatability, fixtures, inspection frequency, packaging, and documented change control. Naming the stage helps the supplier avoid quoting a process that is either overbuilt for a prototype or too informal for production.
Every file in an RFQ should have a part number and revision. The list should identify the current drawing, the matching 3D model, the assembly drawing, and any specifications that override a general note. If the design is still changing, state which elements are frozen and which are provisional. A quote based on an uncontrolled file can become a commercial dispute when the buyer later treats a new revision as included.
• Part number and plain-language description
• Drawing revision and issue date
• CAD file name and revision relationship
• Quantity per finished assembly
• Prototype, pilot, or production status
• Known open engineering questions
• List of documents that form the quotation basis
A 3D model is useful for shape and assembly context, but a 2D drawing communicates datums, tolerances, threads, surface symbols, notes, and acceptance requirements. The strongest package includes both, plus an assembly view showing how the component meets adjacent parts. For masts, fuselages, and mounting plates, the assembly view is particularly important because it makes board, foil, motor, cable, and fastener interfaces visible.
Do not make every dimension critical. Instead, mark the features that affect structural alignment, sealing, electrical or motor interfaces, bearing or shaft relationships, fastener engagement, or the ability to install the part without force. A smaller list of meaningful critical features is easier to inspect and easier for the supplier to protect in the process.
1. Identify the primary datum surfaces and the direction of load transfer.
2. Mark critical hole patterns, bores, flatness, and positional tolerances.
3. Show which surfaces meet seals, gaskets, or bonded interfaces.
4. Identify threads and bores that must remain functional after finishing.
5. State whether dimensions are controlled before or after anodizing or coating.
6. Include a simple fit or assembly acceptance method where possible.
An RFQ should name the alloy and condition rather than simply saying aluminum or stainless steel. If the design team can accept alternatives, state the decision rules: minimum strength, maximum mass, corrosion expectations, machinability, color, joining method, or cost target. Also state whether material certificates, heat-treatment records, or lot traceability are required.
Fanxi Tech’s material guidance covers aluminum and stainless-steel options commonly considered in precision manufacturing. That information can help a buyer frame the discussion, but material choice should remain tied to the design load, geometry, environment, and finishing plan. A supplier should identify any manufacturability or finish-related consequence of a proposed substitution before the change is approved.
Good RFQs tell the supplier where the part is difficult. Mention thin walls, long slender sections, deep pockets, interrupted cuts, tight flatness, intersecting bores, small internal radii, weld distortion, or surfaces that cannot be clamped. This does not dictate the supplier’s process. It tells the supplier where engineering feedback is expected and where price or lead time may change.
Surface finish should be more specific than a color name. State the process, appearance, functional requirement, thickness or range if applicable, masked areas, conductive areas, sealing faces, and acceptance standard. For a marine component, explain whether the finish is primarily for corrosion control, wear, appearance, friction, electrical isolation, or some combination.
• Is the required finish anodizing, hardcoat anodizing, powder coating, plating, passivation, or another process?
• Which surfaces must be masked or remain uncoated?
• Are threads and precision bores accepted before or after finishing?
• Is the component exposed to saltwater, spray, condensation, or trapped moisture?
• Are dissimilar metals in contact, and is isolation required?
• What appearance variation is acceptable between lots?
• Which finish records or certificates must accompany delivery?
A salt-spray test reference may be useful, but the RFQ should state what the test is meant to demonstrate. Appearance, coating breakdown, corrosion initiation, and retained function are different acceptance questions. The same principle applies to hardcoat or decorative anodizing: the process should be selected and accepted in relation to the component’s use.
A quotation should identify what quality evidence is included in the price. Options may include a certificate of conformity, material certificate, first-article inspection report, dimensional report, CMM report, surface-finish record, non-destructive testing, functional fit check, or batch traceability. If the buyer only asks for inspection later, the supplier may not price the required work or reserve the necessary measurement time.
| Evidence item | Use it when | RFQ wording should clarify |
|---|---|---|
| Material certificate | Material grade, temper, heat treatment, or traceability matters | Required document, lot linkage, and acceptable issuing source |
| First-article inspection | The part or interface is new or has changed | Features included, report format, and approval gate |
| CMM or equivalent report | Complex datums and positional relationships control fit | Critical characteristics, measurement reference, and sampling |
| Functional assembly check | Multiple components must fit or operate together | Parts included, assembly condition, and pass/fail method |
| NDT | Welds or structural features require internal or surface verification | Method, coverage, qualification, and report requirement |
| Coating or anodizing record | Finish affects corrosion, wear, or dimensions | Process, thickness or acceptance criteria, and lot identification |
Quantity is not only a price input. It affects tooling, fixtures, nesting, inspection frequency, material purchasing, finishing batch size, packaging, and capacity. Separate prototype quantity, pilot quantity, first production order, and expected annual volume. If the forecast is uncertain, say so. A transparent range is more useful than a precise but unreliable number.
Hydrofoil and efoil projects may need more than a machined body. The RFQ should state whether the supplier is expected to deburr, finish, source fasteners, install seals, prepare a motor or wiring kit, label parts, package assemblies, or deliver a ready-to-install module. Fanxi Tech’s public component page describes modular assembly and coordination of related parts as part of its broader offer, so the buyer should make clear which of those services are in scope for the specific request.
Custom efoil parts can contain valuable intellectual property. The RFQ should identify whether an NDA is required before technical disclosure, who owns tooling and drawings, which subcontractors may access the data, and how long records must be retained. It should also define the change process: no change to material, process, finish, subcontractor, or critical dimension should be made without written approval when the change could affect fit or performance.
1. Write a one-paragraph project and application summary.
2. Assign a part number, drawing revision, and file list.
3. Attach the 2D drawing, 3D model, and assembly context.
4. Mark datums and critical functional interfaces.
5. Specify alloy, temper, heat treatment, and certificate needs.
6. Describe difficult features and expected supplier feedback.
7. State finishing, masking, corrosion, and marine-exposure requirements.
8. Define first-article, dimensional, functional, and traceability evidence.
9. Separate prototype, pilot, production, and forecast quantities.
10. State assembly, kitting, packaging, delivery, NDA, and change-control scope.
A low unit price is not a meaningful comparison if one supplier has excluded finishing, inspection, packaging, or engineering support. Convert each quote into the same scope before ranking it. Ask each supplier to identify assumptions, exclusions, tooling, inspection, subcontracted processes, lead time, and the events that would trigger a revised quote.
| Comparison line | Questions to normalize across quotes |
|---|---|
| Part scope | Are all parts, fasteners, seals, and subassemblies included? |
| Material | Is the same alloy, temper, certificate, and traceability basis used? |
| Process | Are machining, welding, finishing, deburring, and cleaning included? |
| Quality | Are the same reports, first-article checks, and functional tests included? |
| Timing | Does the lead time begin at PO, drawing approval, material receipt, or sample approval? |
| Commercial risk | What is excluded, what is assumed, and what can trigger a change? |
Fanxi Tech is most naturally introduced as a B2B manufacturing and integration example rather than as a generic efoil brand. Its public pages connect hydrofoil and efoil components with CNC machining, material selection, surface treatment, inspection, sourcing, and assembly. That makes the brand relevant when an RFQ asks a supplier to address the complete path from component definition to a repeatable deliverable.
The buyer should still send the same disciplined package to Fanxi Tech that would be sent to any qualified manufacturer. A clear RFQ makes it easier to evaluate whether the supplier’s capabilities match the part, and it gives Fanxi Tech a fair basis for commenting on manufacturability, material, finish, inspection, and delivery assumptions.
A: Usually yes. The 3D model communicates shape and assembly context, while the 2D drawing communicates datums, tolerances, threads, notes, and acceptance requirements.
A: State the current revision, identify frozen and provisional features, and ask the supplier to separate assumptions from confirmed scope. This reduces confusion when a later revision changes price or lead time.
A: No. Mark the features that control fit, load transfer, sealing, or function. Over-tolerancing can add cost without improving the product.
A: Provide alloy, temper, heat treatment, certificate requirements, allowable alternatives, and any mass, strength, corrosion, or finishing constraints.
A: Name the process and functional purpose, identify masked and critical surfaces, state dimensional implications, and define acceptance evidence rather than specifying color alone.
A: Require it for new parts, changed designs, critical interfaces, or any project where the buyer needs documented evidence before production release.
A: Yes, even if the forecast is a range. Volume affects material purchasing, fixtures, capacity, finishing batches, inspection planning, and commercial assumptions.
A: Treating the part as an isolated shape and omitting assembly context. A supplier cannot protect an interface it has not been told is critical.
A: A rough sketch may support an early feasibility discussion, but a comparable production quote normally requires controlled drawings, a model, materials, quantities, and acceptance requirements.
A: Normalize part scope, material, process, finishing, inspection, timing, packaging, exclusions, and change assumptions before comparing total cost.
A strong RFQ turns a custom hydrofoil or efoil component from an ambiguous shape into a defined manufacturing and delivery requirement. It gives the supplier enough context to price the real work, gives engineering teams a basis for reviewing manufacturability, and gives procurement a fair way to compare offers. For Fanxi Tech or any other qualified manufacturer, the best starting point is a controlled package that makes the part’s interfaces, material, marine exposure, inspection evidence, quantity, and change rules explicit.
https://www.asme.org/codes-standards/find-codes-standards/y14-5-dimensioning-tolerancing
https://www.fanxitech.com/pages/how-to-vet-an-e-foil-component-manufacturer
https://www.industrysavant.com/2026/09/top-5-hydrofoil-and-efoil-oem.html
