Revo full-scale benchmark tests

[Topspeedtimmy]

I had this old iPod sitting around and thought it would be fun to try out some auto benchmarking software designed for full-size vehicles. It uses the ipod's built-in accelerometer to measure the rate of acceleration (lateral g's) and thereby determine how fast your car is.

I just taped the ipod to the vehicle in the proper orientation and did some runs down the street. It provided a plethora of information such as horsepower, 0-30mph time, 0-40mph time, as well as the time it took to go several preset distances. We tipped both vehicles a few times due to extreme brushless wheelies, but the ipod came out with only minor scratches.

It measured a speed that was significantly higher than either of our revos can actually go, but I attribute that to the backwards hunch during acceleration, which may have caused the g's to be measured a little bit too high and therefore cause it to think that the vehicle was accelerating faster than it actually was.

It even made some handy graphs. "Revi" refers to a dual velineon e-revo. "Redvesto" refers to a 9XL 4s revo 3.3.

[shaunjohnson]

we are going to get the accelerometer for our eagle tree soon...that will be fun...then you get G force data as well as amps, volts, temps and true speed.

cool idea!!
i put an app on my phone (ericsson K850I, pretty much does everything the I-phone does but clunkier cause it is older than an I-phone) that does acceleration...but alas it wont record the G-force data...
cool idea though...
we want to measure the G force of a crash (you know, the old 'face-full-of-down-ramp') and see what we get.

[ticklechicken]

Accelerometer for an eagle tree? I can't find that anywhere. Link?

[suicideneil]

http://www.eagletreesystems.com/Car/car.html
Not sure if the G-Force thingy is also the accelerometer?

[shaunjohnson]

Originally Posted by suicideneil

http://www.eagletreesystems.com/Car/car.html
Not sure if the G-Force thingy is also the accelerometer?

it is, an accelerometer mesures G-force and via a series of calculations you can estimate data like the I-phone does.

[J57ltr]

Originally Posted by Topspeedtimmy

I had this old iPod sitting around and thought it would be fun to try out some auto benchmarking software designed for full-size vehicles. It uses the ipod's built-in accelerometer to measure the rate of acceleration (lateral g's) and thereby determine how fast your car is.

I just taped the ipod to the vehicle in the proper orientation and did some runs down the street. It provided a plethora of information such as horsepower, 0-30mph time, 0-40mph time, as well as the time it took to go several preset distances. We tipped both vehicles a few times due to extreme brushless wheelies, but the ipod came out with only minor scratches.

It measured a speed that was significantly higher than either of our revos can actually go, but I attribute that to the backwards hunch during acceleration, which may have caused the g's to be measured a little bit too high and therefore cause it to think that the vehicle was accelerating faster than it actually was.

It even made some handy graphs. "Revi" refers to a dual velineon e-revo. "Redvesto" refers to a 9XL 4s revo 3.3.

The speeds are probably high because of formulas used on those devices. A lot of HP calculators have a "fudge factor" built in to the algorithm account for varying things, but it makes really light vehicles read wrong. I ran into this testing a G-tech on a go-cart. It said that we were putting out over 8 hp with only a 5 hp motor. The HP also doesn’t matter how fast you start out, it’s how fast you accelerate and weight that are used to calculate HP. On an engine driven car the HP peak is going to be at the end of the run, whereas an electric will be at the beginning of the run.

Jeff