Видео

You cam PM me at RCgroups.com www.rcgroups.com/forums/member.php?u=36489

There is significant tail shake in most full size aircraft at full power when constrained on the ground during runups. Also, the X tail was significantly more rigid during the flying videos where there is carbon fiber roving applied to their surfaces (all black areas on the aircraft surfaces is carbon fiber in the flying videos). I'm still convinced the warped 3D printed main wing was the cause.

Es un hierro horrendo.

We haven't owned a Seal but the Waterline mode has come in hand a few times. We are still using Posie 2 or 3 times a month during this Florida winter. No mechanical problems yet but I would likely get that warranty if I were you, you never know, it is a harsh environment.

Snuck tesla

Sorry, I have been working on a inflatable set of floats for emergency water landings and always takeoff on wheels. This way I have lower drag for better soaring yet can still fly safely 'low' over water. However I have been 'redirected' to other projects recently. Hopefully before summer...

Sorry, but no it is not. I am too old now to attempt what I did 45 years go...

Check out the description of this video: ruclips.net/video/EHAaNfEwbMg/видео.html

@@DaleCKramer Thank you very much!

We still use it for all all pool cleaning but here in Florida winter it is only used about every 3rd week since we aren't swimming in it again till spring :)

Thanks for the feedback. The boundary conditions for the mesh outlet faces (the top+z and the rear+x faces) are set to fixed gage pressue at 0Pa. You can go directly to the outlet conditions at this link: www.simscale.com/workbench/?pid=613334186170559001&mi=spec%3Afe81ef54-8a7a-41d8-ae2b-a54b13f6dfd6%2Cservice%3ASIMULATION%2Cstrategy%3A1057&ps=analysis%2FboundaryConditions%2F3 And no I am not modelling thrust, the props are stationary. I do a lot of gliding :)

Hi Winston, there is a link in the description to my SimScale CFD project. Floats are not efficient lift generators so I want them at 0 lift AOA. Until I solve the 'energy from the ether' problem I don't want to quote lift and drag values but I am sure that I have the floats at near 0 lift AOA at this 33.5 mph airspeed. I am sorry for delay in keeping our email chat alive, soon I hope.

Cool to see your other projects too on SimScale. I keep seeing Starry Night when I watch this video. I need to learn more, but even if float lift is not efficient, given that zero lift AOA will not reduce the relatively large parasitic drag of the floats, it seems like a slight AOA to give some lift might be worth the extra drag under the float. No prob on the delay, great to see what you've been working on! Now that I know there is a full 3d model of the eLazair4 I really want to see one in x-plane! While x-plane doesnt have CFD, it is a decent physics engine to run scenarios.@@DaleCKramer

Aren't you be able to load an x-plane model from any 3D CAD? Download .STEP CAD for the eLazair4 file from here: www.simscale.com/workbench/?pid=613334186170559001&mi=geometry%3A1014&mt=GEOMETRY Let me know how it works out....

omg dale how long has this cad model been out there?! @@DaleCKramer yes, I see it now. not familiar with simscale so thx for the link.

You and me both if I had only the info I showed you as we see the center of the blue areas at 206 meters behind the tail of the plane are shown at ~8 meters above the wingtips or about 2.5 degrees UP. What I did not mention was that the inlet air hitting the plane comes from a 4.5 degree upward airflow (and the slices are therefore off perpendicular to the freestream by 4.5 degrees) so the blue blobs are really moving down at 2.5 degrees with respect to the free stream velocity which makes the disturbance moving down as expected.

I just put a better explanation of that in the video description. But still the 'energy from the ether' mystery remains :)

It may be stupid but our results are acceptable

I have hundreds of original drawings but there are still hundreds missing. I have drawn a very detailed 3D CAD file of the eLazair4 (hundreds of MB) but not sufficient to be used as plans without access to a Lazair Series III or the like to take that nebulous leap that creates a set of plans. Also, I have just posted a SimScale CFD project that has a downloadable 3D CAD sufficient to get all the basic dimensions and shapes from at www.simscale.com/forum/t/elazair4-cfd-analysis-simulation-project-by-dalekramer/97920

This is one of the most iconic ultralights of the era or even all time. I know there were some rumours of someone other than you resurrecting it as a series IV, but it seems that hasn’t panned out. I have some CAD skills, I’d love to help you finish a set of plans, free of charge.

Please read the description in the eLazair4 video named 'Mar 9, 2023 eLazair4 flight': ruclips.net/video/EHAaNfEwbMg/видео.html

With a 1/2 hr max flight time, I don't go far to have my joy. Range isn't even in my thoughts. Yes it is in the same weight range and also still flies as an ultralight. Pilot experience is the biggest factor in flying safely in high winds. By the way, you and I have the same favorite airplane in the small utility aircraft universe, the Lazair is the pure fun universe :)

Hi Robin, sorry but no, however you might be able to find a used Lazair and convert it to a somewhat similar plane if you are a handy guy and can do some internet searching about this..

It is made from many grades of aluminum. 7075-T6 was used in most high stress areas. The tubing was 6061-T6.

@@DaleCKramer Thank you. Since I have you on the phone, 😁😁😁, would you by chance know what structural improvements were done on the series III ? I am rebuilding a series III and while it's uncovered would like to incorporate them into mine. I'll be using DLE 170M engines and would like to up the cruise speed to 55 mph to keep up with my friends GT400 with his Rotax 503

All Series III wings were created equal. The 2 place wing had (not a complete list from my 'old' memory) a 48" long internal D-cell skin skin doubler at the root, vertical rear spar stiffeners between its lightening holes, and sections of additional 3/4x3/4x1/16 aluminum angle spar cap doublers in some areas of the wing...

Thank you for your time

I am not aware of any significant controversy.