Originally Posted by cervixhunter
According to engineering, the structural stability of a hollow cylinder increases when the length (height) vs. circumference ratio decreases. Researchers tested this on a group of ED patients, correlating the severity of their condition with the length/girth ratio of their penises. The correlation showed without doubt that those with girthier penises were in clear advantage. As the length/girth ratio increased, the blood pressure in the CC had to be significantly higher to maintain erection. The study demonstrated that often the "pencil penis" condition was the main cause of the ED.
Not sure if this is the study but it’s kinda related:
"Penile aspect ratio (D/L). This is the diameter to length ratio of the pendulous penis. Since the assumption is made that linear expansion is the same in all directions, the penile aspect ratio is assumed to be the same at all intracavernosal pressures for any given patient."
"Examples of the two extremes of D/L are discussed; a high D/L ratio, consistent with a short, thick erect penis and a low D/L ratio, consistent with a long, thin erect penis. At P45 mmHg, a patient having the highest D/L ratio (Fbuc 1.89 kg) could withstand a buckling force 115% greater than a patient having the lowest D/L ratio (Fbuc 0.88 kg). A short thick erect penis, all other parameters being equal, thus has a greater ability to overcome initial vaginal introital resistance
than a long, thin erect penis."
"Using (9), it is evident that penile buckling forces are directly proportional to the square of the magnitude of the flaccid penile diameter. In the 21 patients the ratio of the largest flaccid diameter (3.34 cm) to the smallest flaccid diameter (2.23 cm) was 1.5 or when squared is 2.24. Thus, all other parameters being equal, a patient with the largest flaccid diameter could withstand buckling forces double the magnitude of the patient with the thinnest flaccid penile diameter."
http://www.natu re.com/ijir/jou … df/3900311a.pdf