sried,
Thanks for the link, it does have a good spreadsheet to learn from but the code is buried in an xll and dll file.
The dll has two functions
ddydx
Returns the second derivative of the interpolated curve at the given X using the defaults of Interpolate
dydx
Returns the first...
sried,
Yes, now I get it, the conic won't work I need to use a cubic spline instead.
Now I will focus on figuring out how to do that.
I ordered a book on splines, I hope I can figure it out from that.
Jonathan T. Schmidt
http://www.schmidtmotorworks.com
How about if I use a general conic equation from five points?
x y
0.0 0.1
0.25 0.2
0.5 0.3
0.75 0.7
1.0 0.9
(32 * x^2)+(-120* x*y)+(100*y^2)+(12*x)+(1) = 0
Can someone show me how to write an equation to get the:
velocity in y axis
acceleration in y axis
jerk (change in...
sried "You could connect the position points using a Cubic Spline Interpolation. This has the advantage that third order equations exist continously which can be differentiated to give smoothed values for velocity, acceleration and jerk."
I think you are on to something, the more I look at...
That is exactly what I was looking for, thanks.
Also thanks for posting "h= increment" I was trying to figure out what the characters represented. Any other tips would be appriciated.
Jonathan T. Schmidt
http://www.schmidtmotorworks.com
I am trying to write some functions to calculate the velocity, acceleration, and jerk (change in acceleration) of some valve motion data.
The data is typically about 220 points
The x axis is evenly spaced with an increment of 1
The y axis is provided in a list of "position data"
I would like...
sreid,
I'm not familiar with end fences.
Do you mean a plate parralel to the ground fit to the top and bottom of the side surfaces?
In drag racing they use something called "spill plates" on the ends of the wings, is the design something like that?
I am suprised about the suggestion "chopped...
I have entered a gravity powered car race like soap box derby for adults. The size of the car is a maximum of 4 x 4 x 9 feet.
I would like to know what the lowest drag airfoil shape is that I can try to apply wherever possible.
The average speed will be about 40mph with max at about 60mph.
I...
"And lastly, the 8 exhaust rockets can add as much as 2,000 pounds of downforce at take off."
Are you saying that there is significant down force from the exhaust gases? I doubt that it would be anywhere near 2,000 lbs.
Jonathan T. Schmidt
http://www.schmidtmotorworks.com
The concept is simple:
1. Raising the float causes the fuel to come through the booster with less throttle.
2. Reducing the air bleed size causes the fuel to come through the booster with less throttle.
Jonathan T. Schmidt
http://www.schmidtmotorworks.com
I am considering building a gravity racer and I wonder if ot is better to have suspesion or not?
How would I determine the optimum weight?
Any suggestions for steering geometry parameters? Caster, Camber, trail, scub radius etc.
Jonathan T. Schmidt
http://www.schmidtmotorworks.com
There is a company developing a system just like you describe with diesel injectors. They presented at AETC a few years ago. I don't remeber the name of the company but I think they were in Colorado.
Jonathan T. Schmidt
http://www.schmidtmotorworks.com
