[:@] OK What scale is my plane ? I have been told four answers. Help out here. P 51 mustang, SK 130, 65 inch wing.. Thanks for your help

about 1/6 give or take a decimal or 4

Scale = Model dimensions / Full scale dimensions

Using wingspan:

Scale = 65 inch / 37 feet = 65 inch / 444 inch = 1/6.8 = 1/7 approximately

Copied from

http://en.wikipedia.org/wiki/P-51_Mustang

P-51D Mustang
General characteristics
• Crew: 1
• Length: 32 ft 3 in (9.83 m)
• Wingspan: 37 ft 0 in (11.28 m)
• Height: 13 ft 8 in (4.17 m)
• Wing area: 235 ft² (21.83 m²)
• Empty weight: 7,635 lb (3,465 kg)
• Loaded weight: 9,200 lb (4,175 kg)
• Max takeoff weight: 12,100 lb (5,490 kg)

It's a good idea to do the scale formula using the fuselage length to consider against the scale value you get with the wing span. Most semi-scale models have their wing and tail areas modified to get better model performance. Sometimes the tail is lengthened a bit, but you'll find the wing almost always is changed.

If you're looking for the right size scale pilot, it's even more important to consider the fuselage more than the wing.

Its nice knowing there are smart people out there. Thanks for the info

You are welcome; just job related skills.

For using the fuselage dimensions, as suggested by da Rock, just use the same formula:

Scale = (Fuselage lenght of model) inch / 32 feet 3 inch = (Fuselage lenght of model) inch / 387 inch

It is interesting to note that if the dimensions of your model is about 7 times smaller than the legendary ponny, the scale weight should be 26.8 pounds! (9,200 pounds / (7x7x7))

Regards!