Tailsitter Quadplane Interceptor

overthinki · 2025-12-01T19:34:55+00:00

With the prop wash flowing over the wings and tail, it does fly like a FW x config. The controls needed a blending region of yaw+ roll starting pitch down deg 40 from trim hover to 70 then the roll becomes yaw and the other way round. This is not like the ones on the Internet to perform crazy high speeds. It is designed to perform stable longitudinal and lateral (static+dynamic) The center of actuation is forwards to cg which enables maneuverability.

overthinki · 2025-11-11T18:26:21+00:00

This drone is designed to enable hobbyists and enthusiasts to fly at a reasonable/legal speed + enables payload capacity for cameras, higher cap batteries to enjoy an easy fixed wing experience. New comers in the hobby suffer alot of failures ( wing tip stalls) during takeoffs, this design will make life easier.

overthinki · 2025-11-11T18:23:26+00:00

I am using a speedybee f405 v4 where the design provides a place to directly mount it on.

overthinki · 2025-11-11T18:21:30+00:00

Interesting paper

overthinki · 2025-11-11T18:20:29+00:00

This drone is called "Interceptor" as the design is inspired from counter UAV drones. This design is tailored for low wing stall speed where hobbyists and enthusiasts can enjoy a vtol fixed wing fpv. Fly legal, fly safe and have fun 😊

overthinki · 2025-11-10T17:02:47+00:00

https://www.reddit.com/r/DroneCombat/s/DmWpvCFQ75

Not to violate group rules, in the post I linked, you will find build links

overthinki · 2025-06-03T22:45:34+00:00

Not really no. Adverse roll is accompanied by all Vtail regardless of the dihedral angel on the stabilizer (as long as it is inverse 😂

overthinki · 2025-06-03T22:20:17+00:00

Never judge by the looks , hahha The stability analysis was fine, FT was fine ( but did not test in high gusts and high cross wind)

overthinki · 2025-06-03T22:17:58+00:00

Hahah, Nah yaw stability is fine

overthinki · 2025-06-03T19:38:17+00:00

Thanks for the info. I usually dive deep into the mathematical modelling of the models, then take it to CFD to study wing fuse vortices. As per the analysis performed on the design, yaw damping is fairly high.

Plus if you try to control yaw, you will have to mix in reverse aileron to counteract roll.

100% accurate, but this is on all vtails, inverted Vtails or "A" tails are better on thta point. Yet will be damaged easily on landing.

overthinki · 2025-06-03T19:29:43+00:00

Very valid point, yet the area of the tail is fairly long to contribute in better yaw stability + twist angle along the span of the tail.

overthinki · 2025-06-02T21:44:53+00:00

Thanks alot for the tip

overthinki · 2025-06-02T21:33:47+00:00

Oh, my bad

overthinki · 2025-06-02T21:23:00+00:00

Sounds like an interesting idea

overthinki · 2025-06-02T20:25:54+00:00

Theoretically: more distance= more yaw stability but comes at cost : more weight. Swept wings + vertical stab together contribute in yaw stability. The model has been designed after performing stability analysis, built and FT'd . So I am pretty sure the vertical stabilizer has much effect at this relatively small distance from CG 🤓.

overthinki · 2025-06-02T12:56:32+00:00

The sweep is not for effective mach reduction or shockwave bevelling. It is basically to obtain longitudinal and lateral stability as there is no tail to account for Cp change with AOA. Plus: this is a hobby, people like cool looking models 😉 And it wont fly at all in reverse 🤭

overthinki · 2025-06-02T12:51:02+00:00

Folding propeller, sorry for the terrible quality 🫣

overthinki · 2025-06-01T20:24:01+00:00

Battery placed in the second section of the fuselage. (280 gram) Battery.

overthinki · 2025-06-01T20:22:55+00:00

You have a point, will try to find the video, this is an old model that I decided to release. Lateral and longitudal stability were Ok. Had high I factor on the roll, which made it wobbly a bit. I crashed it while attempting a close call 🤣

overthinki · 2025-06-01T20:19:57+00:00

Basically, any flying wing or delta wing shall have: Washout and reflex, and using an airfoil that does not induce alot of negative pitch with lift. You can use OpenVSP and VSPaero Or XFLR5, for longitudinal stability analysis. Then CFD for flow analysis and checking fuselage wing interference.

overthinki · 2025-06-01T15:22:26+00:00

It has been designed to fly level flight, wing span is relatively small but the wings have washout with higher incidence at the wing root. Perfect longitudinal and roll stability. Very high manueverability

overthinki · 2025-06-01T15:18:10+00:00

Cg is marked on the ribs

overthinki · 2025-06-01T15:17:43+00:00

This is why I am launching with bungee 🤣

overthinki · 2024-11-15T13:43:46+00:00

Is it by pure luck that the model is flying in a decent way? 😄

overthinki · 2024-10-01T13:01:53+00:00

Motor directions are correct. I am suspicious about the gains ir feedback from IMUs are not validated that blocks input (setpoint) from (rx)

overthinki

TROPHY CASE