Plenty of tall men (very tall men in particular) are thin-built and have long arms and legs with narrow shoulders i.e. a classical ectomorphic build.
Many of these men, anecdotally, seem to be more likely than others to have a short arm span in comparison to their height, mostly because they have proportionally narrow shoulders. Even so, their arms still look long, or at least proportionally long.
Taken from the old forum:
http://www. /index.php?topic=1990.0
"So I've been doing a lot of measuring and alterations of photos of celebrities, ordinary people (like myself) and someone who's done LL. From MY measurements and observations, most normally proportioned people (and those that have aesthetically pleasing proportions - such as models, celebrities) have a height to arm length (this is NOT armspan - this is measured from top of shoulder to tip of the middle finger) ratio of about 2.3. And this ratio, incidentally, was reported by Benjamin Gould in "Investigations in the Military and Anthropological Statistics of American Soldiers" Cambridge: Riverside Press, reprinted Arno Press, NY 1979 after measuring 4,855 soldiers.
When altering photos w/ photoshop, I've noticed that disporportions start to become noticeable and displeasing as one surpasses a height to arm length ratio of 2.5.
This is one parameter I'll be using to determine the maximum LL my proportions will support. So if you have a program like photoshop, try it for yourselves and let me know if you agree with these ratios...I'd be interested."
On looking around on google for an example of 2.5 arm length to height ratio, I found that the terracotta warriors in China were modelled on that exact ratio.
https://www.google.co.uk/search?q=terracotta+warriors&rlz=1C1EJFA_enGB729GB729&source=lnms&tbm=isch&sa=X&ved=0ahUKEwjvx_LZyvjUAhUrIMAKHVeHAxMQ_AUICigB&biw=1707&bih=789&dpr=1.13#imgrc=CGLIAY3MK8FnbM:
Their arms do look a bit too short to be aesthetically pleasing to me.
I'd be interested if there were any studies done into ideal proportions re arm length vs. height. I found all of this interesting but science > one guy with photoshop...