I am like 99% sure that Americans do what I said in the title, but I wanted ask you anyway. My question is: When a word ends with /rd/ after a vowel and when the next word starts with a vowel, also in the situations when /rd/ is between two vowels in a word, Americans usually make a "flap d" sound which is the exact same sound as the "flap t" sound, right? I know that the /t/ of /rt/ (like in the word "party") is flapped in those positions I mentioned but I am not 100% percent sure if the same thing happens to the /d/ of /rd/ too.
For example the /d/ sounds in the sentences like "This bird is so beautiful" , "Was that show aired in USA too?", "I never heard of him" etc. are the same exact flap sounds as the /d/ sounds in the sentences like "This part of the game is very hard", "This is sort of crazy", "I never hurt anybody" etc right?(As I said, I know that Americans make a flap in the sentences like "This is sort of crazy" which include "rt", but I am not %100 percent sure if they make a flap sound in the sentences like "This bird is so beautiful" as well which include "rd" instead of "rt".)
Or the /d/ sounds in the words "skateboarding", "ordinary", "herder", "order", "hurdle" etc. are exactly the same as the /d/ sounds in the words like "party", "mortal", "turtle", "quarter" etc. aren't they?(As I said, I know that Americans make a flap in the words like "party", "mortal" etc which include "rt", but I am not %100 sure if they make a flap in the words like "order", "herder" etc. too which include "rd" instead of "rt".)
I am used to making the flap sound instead of the standard "d" sound in those situations(unless the /d/ is the first sound of a stressed syllable) and it mostly sounds natural to me. If I make a standard /d/ sound(like the /d/ sound in the word "day") in the words and sentences I gave("order", "skateboarding", "This bird is so beautiful" etc), I don't sound like an American native English speaker, right?