Looking for a buggy project

[jnev]

Cool. Once you do get a full run time, do you think you can PM me the run time, or post it here? One last question, lol (sorry for so many)... with the 2.5d and everything else the same, do you think that the speeds would be able to remain between 45 and 50mph? Will the run times also be significantly longer than the 2d? I was tryign to use your speed calculator, but wasn't sure what to put for gearing, or tire diameter of a 1/8 scale buggy tire.

[BrianG]

Well, as you know, runtime depends on a lot of factors, but with all else being equal, I could use the 2.5d and gear up and get the same runtime and speed as what I have now because the motor would be loaded more.

What I was shooting for was about 35mph for track use. With all the gearing (standard buggy diffs, 46T spur, 14T pinion), and with 4s batteries, I chose the motor that would get me near 35mph, which was one with a kv around 2000rpm/v. Since this motor spins faster, I'll probably get a smaller pinion to compensate. This will reduce the top speed closer to what I want, help unload the motor a bit, help runtime, and keep things cooler.

I use 4.25" as the tire size.

And yeah, I'll post runtime. But it will be closer to actual race time before I take any serious measurements. That's assuming I get good enough to even try racing this year.

[skeeler]

Stupid question: Is a UBEC anything like a BEC? If so, why do you need one, since the Quark 125 comes with a BEC? If not, what the heck is it? And why do you need a big capacitor to go with it?

Sorry to trouble you with such elementary questions.

[skeeler]

By the way, I'm very impressed with the factory-quality conversion of your buggy, BrianG. I'd like to do something similar myself, once I learn more about brushless motors and LiPo batteries. I'm sure I'll have more ignorant questions for you soon.