HENFOIL and HENSYNTH FAQ | HENDOI

Question 1

What is HENFOIL?

Accepted Answer

HENFOIL is HENDOI’s browser-based airfoil design, analysis, selection and optimization product. You create or import a section, pass a geometry quality gate, climb an analysis ladder through VIC viscous polars, compare and select, inverse-design or optimize, then export datasheets and lofts. Methods are screening-grade with honesty gates — not certification CFD or FEA.

Question 2

Who should use HENFOIL?

Accepted Answer

Aerospace engineers, UAV and eVTOL teams, universities, researchers and design bureaus who need transparent section-level work before full-aircraft CFD. Students get the same full product on the Student plan with lighter monthly budgets.

Question 3

Is HENFOIL CFD or FEA?

Accepted Answer

No. HENFOIL does not solve flight-certification Navier–Stokes or replace spar / NASTRAN-class FEA. Thin-airfoil, panel, VIC and optional Euler / IB / gated RANS-SA pictures are early-decision tools. Section FEA is a unit-span structural screen only.

Question 4

Are results certified?

Accepted Answer

No. HENFOIL provides conceptual and preliminary screening. It does not replace wind-tunnel campaigns, required certification analysis, flight test or authority-approved methods. You remain responsible for engineering decisions.

Question 5

Where can I learn how to use each feature?

Accepted Answer

Open the Blog How-to category for field-by-field guides: Digitize controls, Create (NACA/CST) fields, Geometry Doctor metrics, VIC polar inputs, Selection filters/cruise CL, Optimize objectives/constraints, and Team seats/access grants. HENSYNTH articles cover geometry, requirements, synthesis and reports. This FAQ answers short questions; those posts explain purpose and expected results for each field.

Question 6

What is HENSYNTH?

Accepted Answer

HENSYNTH is live. It is HENDOI’s aircraft conceptual and preliminary design product: geometry, mission requirements, screening analysis, compliance margins, candidate synthesis, Mission, Performance, Trades, Optimize and Reports. It is conceptual screening — not a wind-tunnel report and not a certification showing.

Question 7

Are HENFOIL and HENSYNTH both available?

Accepted Answer

Yes. Both are live. HENFOIL is the airfoil section workspace. HENSYNTH is the aircraft mission and synthesis workspace. Sign in once on HENDOI and launch either product from your account dashboard.

Question 8

How do HENFOIL and HENSYNTH fit together?

Accepted Answer

Keep the airfoil decision in HENFOIL. Carry the chosen section into HENSYNTH for planform, requirements, Run screening, compliance and style candidates. Same plans cover both products.

Question 9

What is the HENSYNTH product loop?

Accepted Answer

Create a project, enter Geometry, set Requirements, Run screening, read the compliance table, optionally Synthesize candidates, then open Mission, Performance, Trades, Optimize or Reports for deeper screening. Help inside HENSYNTH restates the same loop.

Question 10

What are Mission, Performance, Trades and Optimize?

Accepted Answer

Mission shows stored mission metrics and can run mission-opt. Performance shows predictions from the latest analysis. Trades runs one-at-a-time sweeps and local sensitivity. Optimize runs a conceptual random-search range maximizer. All are screening aids, not certified optima.

Question 11

What can I download from HENSYNTH?

Accepted Answer

After a requirements run you can download or mail a zip with PDF, figures and stored numbers. Each synthesize candidate card has the same download and mail icons. Reports downloads the latest analyze PDF and can list earlier stored runs.

Question 12

Who should use HENSYNTH?

Accepted Answer

Aerospace OEMs, Tier-1 suppliers, UAV and eVTOL manufacturers, design bureaus, research labs, aeronautical engineers, researchers and students who need early aircraft mission screening before expensive CFD or tunnel work.

Question 13

Is HENSYNTH certification software?

Accepted Answer

No. PASS / FAIL is requirement-versus-prediction screening only. It does not replace tunnel campaigns, flight test or authority-approved methods.

Question 14

What do plans cost?

Accepted Answer

Student USD 9, Professional USD 29 and Team USD 89 per month, billed in USD worldwide. Prices are unchanged. The same plans cover HENFOIL and HENSYNTH.

Question 15

Do higher plans unlock more features?

Accepted Answer

No. All three plans unlock the full HENFOIL product — digitize, polars, icing screens, mesh, FEA screens, inverse, optimize, STEP, PDFs and HEN-AI — and full HENSYNTH: geometry, requirements, synthesis, Mission, Performance, Trades, Optimize and Reports. Only monthly usage quotas differ (projects, airfoils, polars, optimize runs, storage, HEN-AI requests).

Question 16

What does the Student plan include?

Accepted Answer

Everything in HENFOIL, with lighter budgets — for example about 3 projects, 40 airfoils, 80 polars / month, 8 optimize runs, 100 HEN-AI requests and 1 GB storage. Upgrade when you hit a limit.

Question 17

What does Professional include?

Accepted Answer

Full HENFOIL with higher budgets suited to daily engineering — for example about 20 projects, 400 airfoils, 800 polars / month, 40 optimize runs, 500 HEN-AI requests and 5 GB storage. Most solo engineers choose this plan.

Question 18

What does Team include?

Accepted Answer

Full HENFOIL with the highest usage budgets: unlimited projects and airfoils (fair use), unlimited polars, 160 optimize / 120 robustness / 200 design-review PDFs / month, 400 compute credits, 2,000 HEN-AI requests, 25 GB storage and priority support. The Team owner can invite up to 10 seats. Each member signs in with their own HENDOI account. Monthly usage meters are shared across the team.

Question 19

How do Team seats and access work?

Accepted Answer

The Team owner invites colleagues by email from Account → Team. Each person keeps their own login. The owner always sees all members’ airfoils, projects and analysis. The owner can also grant another member view / edit / download / delete access to a teammate’s work. Email notifications go out when access is granted or revoked.

Question 20

When do usage limits reset?

Accepted Answer

Monthly meters (polars, optimize, HEN-AI, PDFs, compute credits) reset each billing month. Projects, airfoils and storage are live inventory caps — they count what you keep, not a monthly burn.

Question 21

Can I change or cancel my plan?

Accepted Answer

Yes. Manage billing from your HENDOI account after you sign in. Contact support if you need help moving between Student, Professional and Team.

Question 22

Is there a free trial?

Accepted Answer

Create a HENDOI account on hendoi.com to get started. Plan details are on the Pricing page (use the info icon next to each plan name). For Team or OEM evaluations, use Contact and message us on WhatsApp.

Question 23

What is Digitize for?

Accepted Answer

Recover a section from a drawing, scan or screenshot when you do not have DAT coordinates. It is for starting points — not inventing precision the image does not contain.

Question 24

Why must I click LE and TE?

Accepted Answer

Leading edge (LE) and trailing edge (TE) define the chord direction and scale. Without both, HENFOIL cannot calibrate the image. Digitize does not extract outline points from LE/TE alone.

Question 25

Why is Detected: 0 points after LE/TE?

Accepted Answer

Because you still need Auto detect contours (then Reconstruct / fit). LE/TE only calibrate. Apply preprocess only retunes brightness/threshold — it does not create coordinates.

Question 26

What do Brightness, Contrast and Threshold do?

Accepted Answer

They prepare the image for contour detection. Brightness shifts mid-tones; contrast stretches black/white; threshold decides what counts as ink vs background. Invert flips ink/paper; Sharpen can help soft scans. Click Apply preprocess after changing them.

Question 27

What does Detect mode mean?

Accepted Answer

Adaptive (local) adapts to uneven lighting; Global uses one threshold; Edge looks for stroke edges. Prefer Adaptive for photos of paper drawings.

Question 28

When does Create Airfoil enable?

Accepted Answer

Only after Reconstruct / fit has produced coordinates. Until then the button stays grey even if the image looks perfect.

Question 29

What result should I expect from Digitize?

Accepted Answer

A closed or near-closed set of airfoil coordinates, chord metrics, fit RMS and quality notes — then a saved airfoil you can send through Geometry Doctor and polars like any other section.

Question 30

What is Geometry Doctor / the quality gate?

Accepted Answer

A check that thickness, camber, LE radius, TE state, curvature and fit are honest before analysis. PASS / WARNING / FAIL tell you whether to fix ordinates first.

Question 31

What is the analysis ladder?

Accepted Answer

Thin-airfoil → Hess–Smith panel → IBL + eⁿ screen → VIC viscous polars, with optional higher screens. Start cheap; escalate only when the decision needs more physics. Every rung stays labelled.

Question 32

What fields do I fill for a polar?

Accepted Answer

Typical inputs: Reynolds number (Re), Mach (or assume low-Mach), angle-of-attack range or list, transition model / trip flags if offered, and which solver rung (panel vs VIC). Fill Re from your flight or tunnel condition; AoA span for the mission you care about. Wrong Re or AoA range produces a smooth curve that answers the wrong question.

Question 33

What result do I get from a VIC polar?

Accepted Answer

CL, CD, Cm vs α (and related metrics) with method IDs and gate status. Use it for early ranking and documented selection — not as a wind-tunnel or flight-Re RANS certificate.

Question 34

What is Compare / selection for?

Accepted Answer

Rank several airfoils under the same conditions with your weights, then read why-#1. You get a defendable shortlist, not a black-box score.

Question 35

What does Optimize need from me?

Accepted Answer

A design space (e.g. NACA or CST parameters), objectives (CL, CD, thickness constraints) and budgets (iterations / jobs). You get candidate shapes plus the same honesty gates — always re-check geometry and polars after optimize.

Question 36

Can I export reports and CAD?

Accepted Answer

Yes. Datasheet and design-review PDFs, CSV / JSON where available, STEP/IGES loft, and a HENFOIL design package — subject to plan PDF and storage limits.

Question 37

Does HENFOIL invent catalog airfoil ordinates?

Accepted Answer

No. Generated families (for example NACA) are computed in-process. Named research cards stay metadata until licensed attested ingest.

Question 38

What are honesty gates?

Accepted Answer

Geometry, mesh and analysis packs report ACCEPT, ACCEPT_WITH_WARNINGS or REJECT with method IDs so you see what failed and why.

Question 39

How do I get access?

Accepted Answer

Register or sign in on hendoi.com. One HENDOI account unlocks HENFOIL and HENSYNTH — both are live. Open either product from your account dashboard.

Question 40

What is HEN-AI?

Accepted Answer

HEN-AI is the engineering copilot in the product workspaces. It calls tools and explains calculated results. It never invents performance numbers that were not computed.

Question 41

How is HEN-AI billed?

Accepted Answer

By requests remaining this month, not tokens. Student 100, Professional 500, Team 2,000 shared across the team.

Question 42

Is my data private?

Accepted Answer

Yes. Passwords are stored only as irreversible hashes. Session tokens are hashed and revocable. Project files use private storage with signed access. We do not sell personal data or use your engineering files to train public AI models.

Question 43

How do I contact support?

Accepted Answer

Email support@hendoi.com, or use Contact — name, email or phone, and message — then Send (WhatsApp). Phone numbers are published on the site.

Question 44

Where is the company based?

Accepted Answer

HENDOI TECHNOLOGIES PRIVATE LIMITED is registered at Hanumar Koil Street, West Mambalam (Near Mambalam Railway Station), Chennai City, Tamil Nadu, India - 600033. Delivery of HENFOIL and HENSYNTH is online worldwide.

Question 45

Do I need two accounts for HENFOIL and HENSYNTH?

Accepted Answer

No. One HENDOI registration covers both. After you sign in, open HENFOIL for airfoil work or HENSYNTH for aircraft conceptual screening from the same dashboard. Billing and plan quotas apply across both products.

Question 46

When should I use HENFOIL vs HENSYNTH?

Accepted Answer

Use HENFOIL when the decision is the section: digitize, create, geometry gate, polars, compare, optimize, export loft or datasheet. Use HENSYNTH when the decision is the aircraft: geometry, mission requirements, Run screening, compliance, synthesize candidates, Mission / Performance / Trades / Optimize / Reports.

Question 47

Can I move an airfoil from HENFOIL into HENSYNTH?

Accepted Answer

Yes — that is the intended loop. Finish the section decision in HENFOIL (geometry gate + polar ranking), then carry the chosen section into HENSYNTH planform and mission work. Do not treat a HENFOIL polar as a full-aircraft certification result.

Question 48

Are both products screening-grade only?

Accepted Answer

Yes. HENFOIL and HENSYNTH are conceptual / preliminary screening tools with honesty gates and method labels. Neither replaces wind-tunnel campaigns, flight test, or authority-approved certification analysis. You remain responsible for engineering decisions.

Question 49

What browsers and devices work?

Accepted Answer

Use a current desktop Chrome, Edge, Firefox or Safari. Both products are browser-based engineering workspaces — a laptop or desktop with a stable connection works best. Phones can open the marketing site and account pages; heavy digitize, polar and synthesis work is designed for larger screens.

Question 50

Where do I see my usage for both products?

Accepted Answer

Sign in and open Usage on your account. Meters show plan limits for projects, airfoils, polars, optimize, HEN-AI, storage and related HENSYNTH counters. When a meter hits the cap, upgrade the plan or wait for the monthly reset where that meter is monthly.

Question 51

How do I get started with both products quickly?

Accepted Answer

Register, pick Student / Professional / Team on Pricing, then login. In HENFOIL: create or import a section → Geometry Doctor → run a polar → compare if needed. In HENSYNTH: create a project → Geometry → Requirements → Run screening → read compliance → optionally Synthesize. How-to posts cover each field in detail.

Question 52

Is HENDOI only an aerospace software company?

Accepted Answer

Yes. HENDOI TECHNOLOGIES PRIVATE LIMITED is a purely aerospace-specific software engineering company. We build tools for airfoil and aircraft work — not general consumer apps. Live products today are HENFOIL (airfoil) and HENSYNTH (aircraft conceptual screening). The roadmap stays inside aerospace engineering software.

Question 53

What is HENMESH?

Accepted Answer

HENMESH is our planned aerospace-specific simulation preprocessor and meshing software for 2D and 3D. It is aimed at preparing meshes for aerospace CFD and structural workflows. HENMESH is not live yet — we are in the process of launching it. Use HENFOIL and HENSYNTH today for section and conceptual aircraft screening.

Question 54

What is HENFLOW?

Accepted Answer

HENFLOW is our planned aerospace-specific CFD analysis product for 2D and 3D flow simulation. It is built for aerospace engineering use — not as a generic multiphysics catch-all. HENFLOW is not live yet; we are in the process of launching it alongside HENMESH. Live screening for airfoils and aircraft concepts remains on HENFOIL and HENSYNTH.

Question 55

What is HENSTRUCT?

Accepted Answer

HENSTRUCT is our planned aerospace-specific structural analysis & simulation software for 2D and 3D. It sits on the roadmap after the HENMESH and HENFLOW launch path. HENSTRUCT is not available yet. Unit-span structural screens inside HENFOIL today are not a substitute for a full aerospace FEA product.

Question 56

Can I use HENMESH, HENFLOW or HENSTRUCT today?

Accepted Answer

No. Those products are not live. Register and use HENFOIL and HENSYNTH now. Open each upcoming product page for intent and problem statements, or Contact us if you want to be notified when HENMESH / HENFLOW open. Do not treat blog posts or FAQ mentions as a shipping date.

Question 57

How do future products relate to HENFOIL and HENSYNTH?

Accepted Answer

The intended family is one aerospace stack: HENFOIL for the section, HENSYNTH for aircraft conceptual screening, HENMESH for mesh preprocessing, HENFLOW for aerospace CFD (2D/3D), and HENSTRUCT for aerospace structural analysis & simulation (2D/3D). Live products stay screening-labelled until we say otherwise. Upcoming solvers will carry their own method labels and honesty about intended use.

Question 58

How can I share feedback or industry challenges?

Accepted Answer

We want to hear what problems you face with existing solutions and how we can improve. Share your thoughts by WhatsApp, phone call or email to support@hendoi.com — or use Contact. Describe your industrial challenge; we are eagerly waiting to hear from aerospace teams and try to come with the best solution for this industry. Your feedback also shapes HENMESH, HENFLOW and HENSTRUCT.

Question 59

How do I contact HENDOI for help?

Accepted Answer

Use the Contact page: enter your name, email or phone, and a short message, then Send — that opens WhatsApp with your details pre-filled. You can also email support@hendoi.com. Phone numbers for the company are published on Contact and About.

Question 60

What should I include in a support message?

Accepted Answer

Tell us which product (HENFOIL or HENSYNTH), your account email, the page or button you were on, what you expected, and what happened instead. For digitize or polar issues, note browser and a short description of the airfoil or project. Screenshots help. Do not paste passwords.

Question 61

How will you help with technical problems?

Accepted Answer

We triage account, login, billing, plan quota, digitize/import, geometry gate, polar/run failures, HENSYNTH requirements/synthesis/report downloads, and Team seat access. We guide you to the right field or workflow, check honesty-gate messages with you, and escalate product bugs to engineering. We do not run your certification CFD or sign off flightworthiness for you.

Question 62

What tech issues can support help with?

Accepted Answer

Typical tickets: cannot login or register; plan not updating; usage meter unexpected; Digitize Create Airfoil stays grey; DAT import / Geometry Doctor FAIL; polar or optimize job error; HENSYNTH Run screening or report zip; Team invite or access grant; HEN-AI request count; STEP/PDF export limits. If it is a browser crash, say which browser and OS.

Question 63

Will you help me interpret my engineering results?

Accepted Answer

We can explain what a field, method ID or honesty gate means in the product, and point you to How-to posts. We cannot act as your certifying authority or redesign your aircraft for you. For deeper workflow questions, HEN-AI inside the workspace explains calculated results that already exist — it does not invent numbers.

Question 64

How fast do you respond?

Accepted Answer

WhatsApp and email are monitored by the HENDOI team in Chennai business hours, with priority handling for Team plan subscribers. For urgent login or billing blockers, say “urgent” in the first line and include your account email. Complex engineering bugs may need a short back-and-forth after we reproduce.

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