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Excellent, Sonya. Thanks.

The best video about propellers I've seen. I'm starting to follow you because I'm sure you'll have very interesting material. Thank you very much.

Pleas tell me show me, how i can make a propeller geometric construktion drawing with pencil, paper and so on, not auto- cad . I know it is a helix , but this is not all . Hochachtungsvoll Lust Johannes

Excellent !

Great, concise video.

maam thank you for your video, i have a fantacy to design and build a light aircraft for myself with a turbine engine which i really love to i design and build myself, the problem is i couldnt find a proper information resource so i can read and learn, in a neaningful time without studing at univercity for 20 years, can you please name some refrence books for designing planes and turbine engines and what softwares are better for me to use please?

👍

I have not flown a prop driven aircraft in forever, but I stayed for the whole propeller TED talk. :)

That video is improving the quality of TH-cam videos, thank you very much!

I've not seen a propeller design like 0:47 before, how does the very tapered tip work?

13:19, your suggestions for static WOT rpm: There is a video by Jonas Marcinko (th-cam.com/video/HIT3e1QgphA/w-d-xo.html) where the WOT static rpm is a bit higher than level-flight WOT rpm for some pitch settings of the newly installed ground-adjustable Eprop propeller. I presume the narrow-bladed propeller blades go into a relatively low drag stall state when revved up on the ground.

On my electric-powered radio-controlled models, I try to use a prop that has a diameter-to-pitch ratio (D:P) of at least 1.5:1 and no more than 2:1. This provides good acceleration on takeoff, good cruise speed, and longer flight times.

Very informative.

Sonja, really enjoy your videos. I wish you a Merry Christmas and a berry good new year!!

#1 You go, Sonja!

Бред сивой кобылы, Соня ты не разбираешься в этом вопросе . Заучила книжки наизусть и транслируешь .

тема не раскрыта , анализ и систематизация данных неудовлетворительная

Excellent video about very important topic. Thank you.

Very nice video!

Does the propeller has reverse thrust?

Beautiful ship....is this a kit? Awesome....thanks for the video

Thanks for posting the report. That’s got to be the lowest total fuel burn per hour of any twin flying?

that's a lot of useful information! thank you 👍

Excellent 😃

Great summary of the flight and your day. Thanks for posting - keep them coming!

Hi Sonja, keep the Experimental Soaring Association, Western Workshop in mind for Labor Day weekend, 2025 in Tehachapi.

congratulations very nice!!!

2:25 should be lift distribution instead of local lidt distribution isnt it? Please correct me if im wrong

Very interesting. Of course in a real world excercise in cleaning up the airframe, as you do at the end of the vid, you would add to the the weight and cost, particularly the retractable gear. This would add to the drag and therefore be be a trade-off rather than a clear win. All design is about balancing trade-offs.

Headwinds both directions? Makes for a "special" kind of trip to Oshkosh. Thanks for sharing!

Didn't bring your motorglider this year? Really enjoyed your talks some years back on spin resistant and spin recoverable airplanes (I know I got the names wrong...)

So Cool!! Thank you for sharing.

Great video! Disappointed that you didn’t stop in at 46U in WY… Maybe next time?

Insightful

Thank you for making these, I find them very helpful

Composites are different, e.g., fatigue of glass-fiber composite is similar to aluminium alloys. Usually in general the less prone to fatigue just because of higher safety factors fir composites

Sonja, your voice is one tone. You know what to speak, But how,..... somewhere, must be a course about effective speech

Grüsse vom Zürisee

Thank you so much for your insights ! It may also be very interesting to learn more about both the scale of the mechanical efforts acting on the mobile surfaces, and the entire transmission of the orders from the stick to the wing/tail.

Thank you very much for all these videos Sonja, they are really helpful. Regards Ben

Amazing info. Don't know why this didn't show up in my feed before

When you mention "reference plan" you mean, the datum station? Loving this tutorial. Thanks for putting your effort on it.

What an information packed video!

I might have missed it but the rudder is very important for countering adverse yaw when using ailerons to roll. The only exception I have found was where spoilerons were used instead of ailerons as was tried with the American Eaglet homebuilt glider I have flown, and also used on the Mitsubishi MU2.

Is this your own design of motorglider Sonya?

👍👍

I have a question. When configuring a tandem wing aircraft on a straight cylinder fuselage.....can both sets of wings be on the same mid wing axis or does the front wings need to be lower than the rear? I have have seen RC planes with both sets of wings on an equal high wing axis but does this also apply to full sized aircraft?

Thanks very much for the videos. Brilliant content.

Merci Sonja

Uhps, ich muss wohl mein Ruder nochmals durchdenken