# Thrust measured in grams and discerning horizontal acceleration?

So, I have a small ducted fan which has a listed "thrust" of 75 g at a set voltage. I'm going to assume the "g" is short for "grams". Why would this be measured in grams instead of newtons and how can this be calculated to yield the vertical acceleration provided by the fan? Is this meant to be the thrust-to-weight ratio and if so then shouldn't this value not have any units assigned?

Now, if I attached this ducted fan to a small ground RC vehicle and rotated it 90 degrees so that the direction of thrust was confined to the x-y horizontal plane. Assuming that the drag of the car and the friction from the wheels was negligible, how do you calculate the acceleration provided by the ducted fan from the 75 grams?

The $g$ is apparently being used to mean gram-force, a non-standard unit of force equivalent to 9.80665 mN. According to the Wikipedia article, it was historically common for rocket thrust to be measured in kilogram-force, and kilogram-force is still used occasionally for expressing thrust today. The information for the fan should really say that it produces a thrust of $75gf$, for clarity.
Your $75gf$ fan thus nominally has a thrust of about $0.735$ Newtons, from which you can of course calculate the acceleration by using $F=m a$.