let's review somethings that you said.......
ORIGINAL: BFoote
There is a reason that all delta wings have their tips set so that at cruise their wingtips provide NO LIFT and in fact generally provide negative lift. It ain't for high speed performance either. Its called low speed control performance or lack thereof and maneuverability.
Just because you don't want to fly a scale (real airplane) JET RC aircraft, now makes you an expert?
You don't notice diamond dust etc deficiencies because they are so overpowered along with their very low wing loading combined with the fact that deltas have VERY high angle of attack compared to a ''straight wing''
All deltas..?
Low speed performance has been terrific at this end without any gimmicks, myths or legends.
Pay close attention to intelligent weight management...that's all.
I wasn't aware that scale models are "real" airplanes. I guarantee you would be convinced that mine are "real" if you were ever unfortunate enough to stand in the way.
Diamond Dust type deltas fly splendidly at all speeds and power levels.
Exagerrated AoAs with deltas vs conventional planes is more myth unless your model is either so overweight or flying so slow that it has to be flown like a kite.
Expect pretentious, blanket statements that only pertain to some models to be met with contentious replies in the aerodynamics forum. My purpose is to debunk myths so that some onlookers wont be mislead into believing things that are only half truths.