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  • Users: tomand
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  1. tomand

    scanf

    scanf take alot of program memory. I need to find an alternative to scanf. I need to read two numbers from seial port, add them and present the result. As an example, I had the same problem with printf and at last found this code example: void send_serial(unsigned char *s) {while(*s != 0x0)...
  2. tomand

    Insulator for Capacitor

    I have a question regarding capacitors in general. Theoretically a capacitor consists of two metal plates in parallell. In the ideal case where there is vaccum between the plates there should be infinite resistance between the two plate. I am trying to make a capacitor with two aluminium foil...
  3. tomand

    Large cooling fan from some large truck engine.

    Hi I am looking for a large cooling fan from some large truck engine. It doesn't matter which model. The largest I have seen is around 16 inches in diameter, but I need something around 30-40 inches. I need something like this: http://www.arrowprop.com/comp.html But these are very expensive...
  4. tomand

    Help with my first C program.

    I am trying to program an atmel AT89C2051. As you might know it has a capacity of 2K. Now the program itself is only a few lines. But when I compile it, a hex file is produced that is 3.2K. So I get an error message. The large file is because of to lines in the program: #import<file1.h>...
  5. tomand

    Propeller Calculator

    Hi Does anybody know about a calculator that Takes: Number of blades, Rotor diameter, Blade chord, Blade weight, Aerodyn Pitch, and claculate the profile drag of the propeller blade? much like http://www.icon.fi/~jtki/gyrocomp.html avialable at...
  6. tomand

    Electric motors & &quot;No-load speed min -1&quot;.

    Hello The lift equation for airplane's wing is: L=(1/2)*ro*S*CL*V^2 In the case of a rotating wing the mean lift of an untwisted rotor is in actual fact 1/3 the maximum lift at the tip because the lift profile is a parabolic curve. Thus the lift of a fixed wing becomes modified to lift of...

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