This NEW Propeller Gave Us Insane Results! | Whisper Sling Prop Test 

We heard you loud and clear in the RU-vid comments-you all wanted to catch the pure sound of our latest Whisper plane, without the extra tunes added. Well, guess what? We're all ears! Here it is, straight-up Whisper audio goodness, no distractions included! Let's dive into the sound of soaring together! 🎵✈ ru-vid.comMeLD_w3ZNwU?feature=share

Decibel meter would have been nice

My god. Came to hear the prop but all I hear is MUSIC!!!!

I suggest a decibel meter in the cockpit, with old prop, and new.

Cut the music

I am VINDICATED by this new propeller !! Some 20 years ago or so I designed a simple wooden prop with bent inward tips of about 15 degrees, it was about 9 or ten inches and I meant to buy the electric motors to test between it and a straight planar prop but I never got around to it, I believe I left it with my dad because I made a smaller one for me. I hope he still has it because MY house burned down and I lost almost everything I owned. I would have been happy with ten to fifteen percent improvement in thrust with a given amount of power, but your tests show about 25% more thrust and that makes me very happy. I am glad someone perfected this design and now it can be used with electric planes also to extend their range.... and I don't have to use my time to manufacture them because Mr. Catto is doing it better than I could have imagined and with a much larger knowledge base in the physics behind it.

Please for the love of god and everything that is good in the world.... can you just leave the music out. Its cheap, its for teenagers, and its distracting.

I always like to see new tech, but with a prop... there is a lot more than just static thrust. Did the climbout change? Did the cruise speed change? Did the fuel consumption change? And, since the vid is about a "Quiet" prop.... you should have had a Db meter inside, and outside the plane.

In a video that is promoting noise reduction, the music is not helpful🤷🏼‍♂️

A lot of good feelings about the success of the prop but very few facts to support that. How many decibels quieter? What was the speed difference? Climb difference? How much does it weigh? I think the NR prop has better static trust with an 80hp. Maybe altitude? The prop looks amazing, it would be nice to know if outperforms other props. Thank you for the video.

I would like to have heard a low flyover with the old prop and then with the new prop. Cool design...wish you much success.

It's great to see you guys encouraging sound reduction. There are industry-standard sound tests you can run - that would be very helpful to share as well.

Ground testing is fun to see, but the airflow during flight is obviously very different. Optimal pitch increases with air speed. With the same throttle position, 5500rpm on the ground is going to result in much higher rpm in flight.

Wow. Those blades are so clearly inspired by Ludwig Prandtl's second formulae and the bell curve lift distribution. All to reduce tip vorticies.

Don’t do the music

Cool! Can you scale the down to drones?

You really need to try the Eprop super smooth and super quite and 2.5kg in weight...better on the gearbox and will produce the best performance for a Rotax as it has been totally designed for the Rotax engines. Everyone with a Eprop is super happy. Try one..if you dont like it they give you a full refund

I look forward to when we can order the upgraded blades for the Tsi airmaster prop!

I've been looking into quieter drone propellers. There are some interesting designs out there that move the blade tip vortex out of phase between the blades.

Have you guys considered testing toroidal props? They seem to be outstanding. You should've had a decibel meter to determine the amount of the sound difference.

We've been wiating for a Prandtl based prop for years now - glad to see/hear one flying! Now I need one in a constant speed hub for our C182A!

The military could use this technology on there tail rotors to cut the noise. That's where the most prop noise comes from on a standard design helicopter.

That is a very quiet propeller! Well done to Mr. Catto.

Perfect. Finishing up the Vans and I'm buying this.

Noticed that on the first test with the DUC prop, the prop spinner was on. I think for a valid test, the spinner must be on in ALL tests and the winds must be documented to be the same

Im glad to see yall are finding uunique solutions to the Torrance problems

Seeing Torrance airfield makes me so homesick... Great prop design!

Time to update the POH limitations😂

IF YOU WANT US TO HEAR THE PROP NO MUSIC !!!!!!!!!

Little boys on Christmas morning ! Ha - 😅. Cool stuff !

Great work/engineering Catto

Excellent! You're only a step away from having a plane that's so quiet, some people will suspect -- and complain -- that it's a UN spy plane.

Well done Craig. It looks logical to me, and that reduction in noise with increase thrust is a huge benefit. I love the simplicity of the fine adjustment mechanism for all three blades at once. Cheers from Sydney, AU.

Awesome video guys.

Awesome. I'm almost ready to order my TSI kit, and I'm excited for when this prop is available.

Wonderful ! All about performance and if noise goes down that is a rediculous byproduct ! Cool little aircraft - Have fun and as always , be xtra safe - because it’s more fun ! 😊 We do this because it’s fun and serves the people ! See ya - DeBary , Florida .

That was an improvement. Now to see how durable it is.

I wish you would have used one of your other Slings to give us a real time comparison! One during run up and one on the fly over test. But amazing technology and video, thanks

Love that prop. Finally someone improving prop design. Not being an engineer I have always wondered why the exhaust of an airplane is dumped right in front of the cockpit? Why not add 5 or 10 lbs of exhaust pipe past the cockpit to lower the cockpit noise level. The 1 negative that I do see is the parasite drag. The rubber hangers used in the automotive field could work for support. Also the exhaust pipe could be designed to help scavenge the exhaust gases vs creating back pressure so that could help increase the power. IMHO. I'm sure this has been tried but I have never seen it, not that I have seen everything.

Hello Jean aka "Dassie" ! Greetings from Corrie Snr here in the RSA!👌👌👍👍

Daniel Raymer and Craig Catto .... Two legends there

Catto nails it again. Great company, don't blame the FBO's music on him!

Even I could hear the difference, sweet.

What tools should i use to design my propeller? 360 ? Or just foam or wood models?

make sure that when you install an experimental prop to have all your friends and hangers on stand in line with it during testing run up

The prop on the Joby electric has a similar tip shape.Hopefully it'll work even better at higher Mach numbers

Mis más sinceras felicitaciones a los que desarrollan mejoras tecnológicas para la aviación.

It would be interesting to see the performance difference of a prop change on a WW2 fighter.

I had intended to watch a bit at the start and skip to the end but I watched the whole video 😃😃

old school here. do you not safety wire prop bolts anymore?

Would be nice of you to at least mention astonishing Paul Lipps propeller that Catto made for Lipps as an inspiration for the "new" propeller that resembles propellers used on little photography drones for more than a decade. Now if you can rmake similar 1909 Olmsted propeller that I think inspired Paul Lipps, that would be nice.

Reminds me of the Prandtl wing.

you guys should invite the Torrance city council to come see your guys's quieter airplane

I wonder if you could redesign the rotor on an autogyro to make the gyro use less gas at a faster flight

Inspection of Blackhawk helicopter blade tip uses the same idea. The blade has a dog tooth about one blade cord inboard. Generates a vortex rotating opposite the tip vortex. I can understand the noise reduction, but can’t understand why doubling the vortexes increases efficiency.

A toroidal fan blade. Manufacturing a toroidal blade and the certification by the FAA is the difficult part.

Looking more & more like air boat props evolving for 🤔 20 yrs now

Is there a way to use 'Noise Cancellation' (like military helicopters)?

Propellers have one purpose ONLY and that is to keep the pilot cool , you would notice the pilot overheating and sweating a lot when the propellers stop spinning

What regulatory regime are you operating under which allows you to test fly like that? Where I am everything would be bogged down in paperwork for months!

A set of numbers at the end would be nice.

How would a propeller designed from a Sycamore seed work?

I like it. How much airspeed did you loose or gain n at cruise

Beautiful prop. Mr Catto knows his stuff. Outstanding results. Decibel count would have been nice. Lose the music. It contributed nothing in fact it was a distraction.

seems kool :)))

Can't hear anything with that music. Keep it out!

It would be nice to measure the difference in the cruise speed and fuel consumption, also the noise level can be measured using any mic

How can I buy one for my Rotax 914 ? 😊

Is there a constant-speed version?

I snapped 2 motorcycle tie-downs when lifting an elk out of my truck with a forklift. I’d worry about that strap recoiling into the prop if the hook bends. I have no idea how much elasticity there might be in that strap, but this would be an expensive way to find out.

So was the only benefit a quieter plane? Please let me know so I can see if I want one of these vs my Whirlwind.

Before and after comparison would be nice. Maybe two planes following each other. And as others suggested, decimal meters.

Can you mount that on an electric motor?

How about the prop's performance at cruise speed? There is more to a prop than pulling a truck and noise.

Now that the exhaust is the remaining sound, that should be easy to redirect upwards away from the ground, rather than a muffler.

Interesting

I certainly hope all prop blades are the same pitch ! I got ya tho - Roger .

Comparison results could be done using a Toroidal Propeller ???!!!

Imagine WW II warplanes with these props!! American only! P 51 faster than a ME 262?!! Fuel savings and less vibration in a B 17. Coulda shortened the war a bit.

Love you guys as achievements I hear planes going over head you can’t hear yourself think that was awesome the difference I’ve always had touchy ears I hate it when some motorbike or semi with allowed tires in the open exhaust thanks that everybody else wants to hear that noise you can hear them a mile before they get here in a mile after their past I imagine if someone lived by an airport they would appreciate your guises achievements God bless

So what's the speed difference??

You know what quiets down exhaust? Turbos.

When will we see Tubeculs on the leading edge, Shark skin on all surfaces , and zig zag owl trailing edge? Just Tubeculs give 20% extra lift and efficiency imagine the rest?

You have great content on this video, but kill the backround "music".

what in hadies is the tail pipe

Sounds like a Turbin! lol What sound does a turbin sound like.....Oh you mean turbine!

Exhaust muffler next!

I'm so glad to see other people leave comments about horrible music being edited into videos. I can't figure out why so many RU-vidrs think that they need the music. 99% of the time it is annoying, distracting and makes me not want to watch the video.

What is the story with the music?! This is not a gym workout session... why is there no sound dB measurement (even with the phone)?? One frame with summary charts comparison before and after

Please leave the music off.

Why isn't the background music REO Speedwagin, I mean the pilot is the lead singer after all....?

What happens if a rock nicks the prop?

If there is no lift at the tip then why is there a tip vortex?

The aircraft flew without the prop hub cover? Why? (forgot what it's called. -"spinner?")

Propeller man needs a nice hat. Like cowboy

Where is this location?

Hi - Performance Boat guys go apeshit over propellers also ! Cool stuff - Yes sir Big $$$

The pilot looks like Kevin Cronin from REP Speedwagon.

Build one of those for a T-6. =PC=

Rotax engine ?