Quote:
Originally Posted by Xist
|
Nice post.
Quote:
Originally Posted by aerohead
*My boat tail was also 20-degrees in 1980,with a length equal to 75% of body height,bending gently into the slope......
|
If we take a car of approximately 4.5 feet in height, the boat-tail would be 3 Ft 4-1/2" long, right?
The 75% of body height, that's a
scaling factor, right?
In effect, we can scale down the template 70-75% (range listed) and get 97% (31/32x100) of it's benefits, right?
Why don't we just scale down the template then?
Is there a chart showing the losses when scaling down?
Say for instance:
X.100/100% (1:1)
X.75/97%
X.50/39%? (just a guess)
It's that last ratio I'm interested in most.
(see edited comments far below)
If I had at least three reference points I could start to chart this scaling relationship of L to H and percent of boattail affect.
EDIT-1:
Automobile 2 - Odds And Ends Photos by kach22i | Photobucket
EDIT COMMENTS:
Scaling down the template for "boattailing purposes" by a factor of 75% to get it to 1/4th of it's original size results in getting 31 mpg in lieu of 32 mpg on a Dryden/NASA style van, right?