Dudley Henriques wrote:
I'm not sure if you are talking the sim or the actual aircraft. If the actual Mustang I would respectfully disagree with you on the "mere tap" causing a ground looping issue in the 51. I have never found this to be an issue in the Mustang. The main gear on the 51 is more than wide enough and the airplane tracks as if on rails. It takes serious misuse of the brakes to cause a ground loop issue in this airplane.
PROPER use and application of brake however IS important.
Ok, I was exaggerating as in, it's unlikely to cause the plane to spin so fast on the ground to make the outer wing plow a ditch on the landing area (would it be unpaved, of course, as you can't plow concrete). With Spitfire, it's possible (though the narrow track width that causes susceptibility of wing-tip plowing also makes it less susceptible to turn faster than intended when brakes are applied directionally).
So I probably used word "groundloop" in an unprofessional fashion, meaning rather "unwantedly fast rotation" rather than catastrophic wing-tip plowing into the ground. Plowing a ditch with P-51D is about as difficult as plow a ditch with P-40 it just won't work.
Then again, I've heard word "groundloop" used in context of DC-2/3's, which (like P-51D) has quite a wide track width compared to wings span. I guess there's different definitions of "groundlooping", some definitions requiring either wing-tip to actually contact the ground, others to merely cause unintentional spinning around a lateral axis (such as overshooting a turn).
Considering the wide track width of P-51 or P-40 compared to Spitfire, it's obvious the risk of wing-tip-to-ground contact is minimal, thus any looping on the ground (whether you qualify it as "groundloop") is likely to be non-dangerous (to pilot, at least, but it could be harmful to the landing gear). However, with a wide track width, directional breaking also has more effect than directional breaking on a narrow track width. It has all to do with torque: the longer the lever, the less force you need to cause rotation. (It's merely that rotation is less harmful, if you have a long "lever" in a taildragger.)