Failed Maiden SU-27 on 4s lipo and GWS 3900kv motors

Maiden-1 A bump in the road plus a few more variables spells trouble this time...

Later tests proved that having the ailerons dropped like flaps turn out to behave like full down elevator on this model due to the very aft delta wing design. This doomed this 1st flight. Now with mixed "up" elevator that adds in when the ailerons drop as flaps corrects the issue and makes this a great flier.

Category:

Science & Technology

Tags:

• R/C
• Artech
• Su-27
• Flanker

[w4lletbr]

same thing happened to me in a different aircraft and wasn't a delta wing. Exactly same crash. Flaps working as full down elevator. Any particular ratio to the mix to compensate that?

[RemE14MZ]

@w4lletbr

No particular mix ratio, I have posted a video of the mix. On my TX I can set a vol knob to adjust the magnitude of the mix in flight. I now take all models up high and test the compensation mix, adjusting the volume until the model holds the same altitude with the mix applied. These mixes need that kind of adjustment capability to dial in the model, quicker than trial and error on a fixed mix ratio setup.

[RemE14MZ]

No I didn't know that, thanks for the info. What I do know (now), is that if the flaperons are dropped on this model with no slats, that the correct elevator compensation for level flight is a large amount of UP. The corrected model flies great and the flaps really help!

[R0HY]

the ground was way too agresive it was beating up the plane lmao

[pilotonovators]

@RemE14MZ

Thank you for your answer

Cheerz!

[54thAggressors]

I don't know if you know this about SU variant aircraft but the wing is not a very aft delta wing but the wing is designed using an ogival shape and wingroot extension. The wing has a 42 degrees leading edge sweep with full span leading edge slats and trailing edge flaperons. The flaperons combine the functions of conventional flaps and ailerons and move in unison as flaps to provide lift and drag. They move out of unison to function as ailerons. so far from a delta its not funny

[mbrh77]

????