Noobie to Brushless, need little help/advice!

[BrianG]

I see a couple of problems there.
- Your voltage is too low at 7.2v. You should enter 14.4 for 2x6cells packs, or 16.8 for 2x7cell packs. Because the voltage is so low, the motor kv has to be extremely high to compensate.
- You want a 15lb truck to go 50mph! Wow. While possible, you're gonna need some serious power.
- It looks like you chose 1st gear as the tranny ratio. You're gonna be hard-pressed to get 50mph in first gear. Imagine what 2nd gear would do!

Most people lock their trannys in second gear - BL has so much power that first gear is useless unless you want to go very slow a lot.

I entered some more reasonable values and came up with this:

Vehicle Weight (approx): 15
Desired top speed in MPH: 45
Differential Ratio: 2.8461538461538462
Transmission Ratio: 1.7222222222222223
Additional Ratio: 1
Spur Tooth Count: 64
Pinion Tooth Count: 22
Battery Voltage: 16.8
Tire Diameter (inches): 5.75
Total Ratio: 14.25952 : 1
Tire Circumference: 18.064 inches (458.83 mm)
Required Motor RPM: 37511.425 RPM
Required Motor KV: 2232.823 RPM/V
Good Motor Choices: BK Wanderer 7 XL (kv=2145)
Better Motor Choices: No motors of this class fit the parameters you entered.
Best Motor Choices: Neu 1515 1y (kv=2200) LMT 1940/7 (kv=2239) LMT 1950/6 (kv=2178)

[mudrunner4ever]

ok, so that sounds better. i didnt think about have 2 packs. i only thought what one pack was, oppps!! i had no idea how much my truck weighs. its basically a bone stock e-maxx. i have pro-line power stroke shock, titanium turnbuckles, mip cvds on all four corners(not centers) and its got Maximizer diff in the rear(soon to be in front also). do you have a link to any of thoughs motors? preferably a site that takes paypal echeck or ebay? thanks for the help!!!

[jhautz]

Originally Posted by mudrunner4ever

ok, so that sounds better. i didnt think about have 2 packs. i only thought what one pack was, oppps!! i had no idea how much my truck weighs. its basically a bone stock e-maxx. i have pro-line power stroke shock, titanium turnbuckles, mip cvds on all four corners(not centers) and its got Maximizer diff in the rear(soon to be in front also). do you have a link to any of thoughs motors? preferably a site that takes paypal echeck or ebay? thanks for the help!!!

Hmmm.... How about this site!:018:

http://www.rc-monster.com/proddetail...540C_XL&cat=20

Originally Posted by mudrunner4ever

i cant run lipos. 1. i dont have the charger for them and 2. the club leader said we cant run them, hes seen wat they can do.

People are paranoid about lipos cuz of the old horror stories. I agree they should be treated with respect, but as long as you pay attention to what your doing and use common sense you wont have nay issues.

IMO most of the lipo scare stories came from a couple years back when people had no clue what they were doing. CHargers are better now and so is the knowledge of lipo.

If Lipo is still out, check into the A123 Li-Ion cells. Safe and high power.

Remember... A brushless setup is only as good as the power you supply it.

[mudrunner4ever]

Originally Posted by jhautz

Hmmm.... How about this site!:018:

http://www.rc-monster.com/proddetail...540C_XL&cat=20



People are paranoid about lipos cuz of the old horror stories. I agree they should be treated with respect, but as long as you pay attention to what your doing and use common sense you wont have nay issues.

IMO most of the lipo scare stories came from a couple years back when people had no clue what they were doing. CHargers are better now and so is the knowledge of lipo.

If Lipo is still out, check into the A123 Li-Ion cells. Safe and high power.

Remember... A brushless setup is only as good as the power you supply it.

to start off with, whats the difference between the 7XL, 8XL and the 9XL?

and our club has sent out trucks 60ft in the air, YES 60ft! on average they see about 20-30 so the shock of the landings my cause a big boom:004: