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11-14-2012, 09:48 AM

#5886

kitekook

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Join Date: Dec 2006

Location: San Diego, CA

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RE: RC Surfer

The claim of a '2kg lite board' a couple posts back got me thinking....

How 'lite' is my Surfer?

A little research lead me to Wikipedia and this:

http://en.wikipedia.org/wiki/Square-cube_law

The square-cube law (or cube-square law) is a mathematical principle, applied in a variety of scientific fields, which describes the relationship between the volume and the area as the shape's size increases or decreases. It was first described in 1638 by Galileo Galilei in his Two New Sciences.

Loosely speaking this principle states that, as a shape grows in size, its volume grows faster than its area. When applied to the real world this principle has many implications which are important in fields ranging from mechanical engineering to biomechanics.....

and now to our passion of RC Surfers!

The square-cube law can be stated as follows:
When an object undergoes a proportional increase in size, its new volume is proportional to the cube of the multiplier and its new surface area is proportional to the square of the multiplier.

where is the original volume, is the new volume, is the original length and is the new length

Sooooooo.....

34 in...My board
28 in...'2kg lite' board

34/28 = 1.21 (21% bigger)

v(34 inch)= 2 * (34/28)cubed
= 2 * 1.79
= 3.58

1 kg = 2.2 lbs (I'm American so I think better with imperial measurements)

3.58 * 2.2 = 7.87lbs

7.87 lbs !

No wonder I get such long runtimes from my Maui Rc Surfer!

We are even lighter than the "2kg lite board"

RTS mine weighs in at 6.85 lbs

that with 5000mAh 65C 4s Lipos....and the added weight of repairs to my 'second hand/former demo/agent' board!

With run times in the mid 20's and gravity our only limiting factor...

Maui Rc Surfer reaching for the stars!

Building some of the LIGHTEST Rc Surfers on the Planet!

Heck! The last board I made weighed in at 7.6 lbs....here I thought my boards were so HEAVY...[:@]

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