December 2020

The QS3 Nighthawk, an airplane project that I did a lot of work on, made its successful first flight on December 29.

November 2020

Here are the first two links for my "Small Airplane Design Tutorials" on Youtube:



In it, I explain the steps that I use to design an airplane, starting with the definition of the mission, a table which calculates the most important parameters and performance estimates and explanations of terms used in wing design.  More will follow, look for the links on my "Video" page.

September 2020

The Flight Design F2 that I have been working on is now available as an LSA at the US dealership for demo flights with Tom Peghiny. Here is a note I received from him on his first impressions:

Hi Sonja,

I’ve been flying the F2 a lot since we got it flying in May. I’ve flown it nearly 2000 NM in the last three weeks and transitioned a few pilots into it and a lot of demos. I find it a very nice plane to fly and better than I had hoped. Efficient and stable, easy to land and can be a great product for our target customers. I know you had a lot to do with the development and it’s a tribute to your knowledge and experience.


The engine cooling system works very well with the 912iS. I’m very hopeful for the future.


Tom Peghiny

President, Flight Design USA