Airplane + Hydrofoil - Good or Bad Idea?

#Snapmakeristhegift

[pfidze]

Come for the science and action stay for the awesome tunes at the end

[kwaaaa]

Truly impressed by Daniel's ability to find every lost or crashed plane, wing, drone or camera.

[codys]

"Established Titles"

1. No land ownership

2. No legal name change

3. No proof trees planted in Scotland 4. Pricing indicates product is real

D)

5. Upon checkout, buyer is automatically

subscribed to a monthly fee

6. On website, they talk about no land taxes

in Scotland, inferring you own the land

7. Company owns two other brands linked to scams

8. Company lists an office in Scotland but no

office exists, they are in Hong Kong 9. Company personally attacks critics

10. Ads use words "legally", "officially" and "formal", none are true

11. Website verbiage changed after being accused

What else does anyone need in order to realize this company is predatory and highly unethical?

[oldschoolcfi]

The Line through the Clouds is called a Distrail - or dissipation trail, the opposite of a Contrail - or Condensation trail. Both have the same cause - heat and condensation nuclei from the engine exhaust creates localized areas where the water vapor is condensed into tiny ice crystals or water droplets. In the Distrail- the effect creates larger droplets from already condensed mist (the cloud) which are large enough to fall away, leaving an open lane in the cloud.

[lesumsi]

I always enjoy your little side quests, like finding a submerged camera :)

[stefanonegrini]

the level of details and depth in those projects is always stunning.

[shurmurray]

My 5 cents about sharp foils: recently I dove into hydrofoils thing too, designing impeller blades for waterjets. And when I was about to use some basic airfoil I suddenly found the airfoils for water are actually different (surprise) from airfoils for the air. The main reason is the cavitation. And the other reason - much higher water resistance: many hydrofoils do use sharp leading edge. Anyway - within working range of allowed angles of attack (usually something from -13 to +13 deg.) the sharp leading edge works ok.

[squeakybunny]

"so that's why we can't have sharp hydrofoils"

I think what you meant to say was:"so that's why we need to make this thing supersonic" 👍🏻

[FowlerAskew]

I've gotta say it's really nice to have someone to watch who just researches and tests things for the fun of it, it really keeps me motivated to just work on things that I think are interesting

[skenzyme]

The transition from hydrofoil lift to flight on the Regent aircraft seems to depend on a pitch-up "launch" to get more lift by increasing the angle of attack. While this might work, passengers might find such a maneuver more than a little unsettling.

[Space_Reptile]

a little suggestion for the drone that went in the water: spraypaint the waterbottle a bright color so its very easy to spot when upsidedown in the water like that
or fill it w/ expanding foam, so incase it is damaged it does not sink whilst also being more visible

[nikpudhota]

I learnt from one of your videos that I can replace the battery on a Dyson vacuum. This saved me from buying a new one. Thanks mate!

[Biggerman]

Video: this video is sponsored by established titles
Me: *run*

[kinderdm]

In regard to what you mentioned on the jet. Why wouldn't skis be the ideal solution to most of these problems? At low speed the waves aren't an issue on the hull. At higher in water speeds the skis will plane, lifting the body/wings away from the waves. And then at highest speeds, when your airborne, then the skis could be retracted like landing gear against the body for a smooth hull. This seems to give you the best configuration for all three speeds for takeoff/landing transitions.

[tracybowling]

You're so knowledgeable about flying and boating that it makes the episodes fascinating to watch. I like when in some episodes you get super excited. It feels infectious! 👍🏻

[doctaotsu]

I've learned so much from these videos but... I'm not going to lie, watching you recover shit you've lost is one of my greatest joys.

[surfcello]

This is the video I've been waiting for for ages! Your closing remarks are the most valuable to me:

1) Hydrofoils could help get GEVs and seaplanes out of the water, and perhaps aid in landing.
2) They'd have to be retracted to make efficient use of GE.
3) This bonus is not present at RC scales (likely due to smaller mass to surface ratios and lower Reynold's number).

This had indeed been my hunch, but I'm so grateful to you for actually doing these tests and giving your expert's opinion. My motivation for the idea has always been the tell-tale fact that the Ekranoplan allegedly used 8 turbines to take off but only 2 for sustained flight. Perhaps one could also improve efficiency at sub-takeoff speeds by propelling the craft against the water rather than the air - e.g. by a mounting a boat prop to the back of the hydrofoil, or by creating a water jet with water sucked in through a hollow foil.

[keithcress]

Outstanding! Thanks for teaching me about ventilation. Never heard of it before though I've seen it before while not recognizing it as anything. Amazing footage between the drone and the ground effect "napkin"!

[RegisMichelLeclerc]

Hi! I was so happy to see my mug in the "instigators' list" 😊

Thank you so much for making all the research and the tests. As you suggest in the discussion, hydrofoils would need to be short and possibly retractable (although they provide a tiny amount of lift in the air too, with some added instability). The goal is to leave the water as soon as possible to make the transition to and from airborne as fast as possible, especially in choppy waters -- the goal is to fly over the sea, which is *never* flat, even in a cove.

From what you show and the Regent experment (I wasn't aware of this one), you'd use T-foils as they seem to provide more lift and less drag at low speed, and more than just one at the front spread around the CoG (i.e 1 ahead and 2 on the sides behind, or 2 and 2, adding to the same surface).

Currently, I'm more on the Lippisch design (inverted delta) with 12º anhedral to which I add canards, the idea being to add 1 hydrofoil under the fuselage and 1 under each of the floats located at the ends of the wings, so to transition as quickly as possible to airborne. So far, the canards are attached to a nacelle at the front (like big ears on the head of a flying duck) because I wanted to have wings swept 30º forward (making an skirt open 120º in front), but I probably drop that to no-sweep and have the canards attached to a straight edge so to modify the entire wing geometry by moving the canards'edges up and down.



Thank you again for all the work and the actual experimental results you provide. Keep up the fantastic job!

[pjz]

Hey I'm in a video, cool! Thanks for the mention. Excellent exploration of the concept! It's cool to see the historical applications of the tech, so thanks for including those. Ventilation is the WORST when winging, I think that's the appeal of high dihedral front foils, although you rarely see it in rear stabilizers. I'm sure you've done plenty of research while making this thing, but if you want to get into hydrofoiling, there's plenty of money in the industry now, particularly wingfoiling, since it's the new hot thing, so lots of watersports companies have been investing in research to create the best hydrofoils. It's neat to see the differences in performance, high/low aspect, lots/no dihedral, thick/thin wings. I was toying with the idea of creating a biplane style hydrofoil, where the lower wing is smaller, creating less lift, but less drag to provide a gradual transition to flight, but you've proven pretty well the combination with ground effect aircraft isn't super compatible. Well done, keep playing!