Calculating Delta-v

[Affan]

How would I calculate the amount of delta v an engine can provide with 100 units (an flt-100 tank) of fuel?

Thanks

[arq]

<dV> = 9.81 * <isp> * log(<mass>/(<mass>-<fuelmass>))

where log() is the natural logarithm and <fuelmass> is <oxidizer>/110, if you have the liquid fuel to match and measure in tons. If they match, it is also (<oxidizer>+<liquid>)/200, or in your case 0.5t.

[EtherDragon]

To calculate dV, use the Rocket Equation:

source: http://en.wikipedia.org/wiki/Rocket_equation

Replace Ve with 9.81*Isp.

M0 is your full starting mass

M1 is your empty mass (all propellant expended)

[capi3101]

An FL-T100 has a fuel mass of 0.5 tonnes; its total mass is 0.5625 tonnes wet, 0.0625 tonnes dry. The amount of delta-V you can get from that depends on the mass of the payload you're attempting to move with it and the efficiency (specific impulse) of the engine - and to calculate it, use the Rocket Equation that both previous posters have generously provided.

If you want a specific value, we need to know the payload mass and what engine you're using. I'm assuming this is for a probe or something small given the small size of the tank, so a parts list will also be acceptable.