Drum roll please... final Neu motor choice(s)...... - Page 2 - RC-Monster Forums

mk351e · 04.29.2008, 11:06 PM

thanks guys. I think I'm a little clearer on things now. However, if I tally votes, it seems a 1515 and a 1521 are pretty close w/ everyone. Soooo, here's the tiebreaker: does everyone agree that a 1521 is more efficient? I'll get longer runtime if I spend the extra $20 then with this one? 1900kv?

lutach · 04.29.2008, 11:31 PM

Quote:

Originally Posted by mk351e

thanks guys. I think I'm a little clearer on things now. However, if I tally votes, it seems a 1515 and a 1521 are pretty close w/ everyone. Soooo, here's the tiebreaker: does everyone agree that a 1521 is more efficient? I'll get longer runtime if I spend the extra $20 then with this one? 1900kv?

Go with the 1521/1Y. On 6S it's an animal. I can make another video of my BPP truck and it now sports XTM Mammoth wheels

. The other ones made the truck look strange.

jhautz · 04.30.2008, 12:30 AM

Quote:

Originally Posted by mk351e

thanks guys. I think I'm a little clearer on things now. However, if I tally votes, it seems a 1515 and a 1521 are pretty close w/ everyone. Soooo, here's the tiebreaker: does everyone agree that a 1521 is more efficient? I'll get longer runtime if I spend the extra $20 then with this one? 1900kv?

No. I dont agree that the 1521 is more efficient than the 1515. A bigger motor spinning at the same rpm as the shorter motor will draw more current and give shorter run times.

Yes... the 1521 can make more power than the 1515, but the power if for nothing but spinning wheels. You cant put it to the ground. (you cant even put all the power of a 1515 to the ground)

I'm assuming based on you first post you want to keep some kind of decent run times and the 1515 will generate enough power and speed to make you very happy. On the other hand if you want flat out raw power and current draw and run times be damned than theat 1521 would sure be fun. There is something to be said for overkill...

lutach · 04.30.2008, 12:45 AM

My 1521/1Y is drawing 75A spikes after I went back to the truggy diffs.

jhautz · 04.30.2008, 12:50 AM

Same setup with the only difference being the 1515 motor with the same kv and I bet you get around the track just as fast and run 20% longer.

mk351e · 04.30.2008, 12:56 AM

seems like common sense to me that the larger one would draw more current (more energy to move the larger heavier mass), but some said 1521. I don't really need or want flat out silly raw power; I think anything we're talking about here can smoke nitro all day, so I think I'm gonna go 1515 2D and call it a day. Unless someone disagrees and this continues, I think "I'm there". And even if I'm off in my selection, it doesn't seem like I'm too far off.

I thought about going BL months ago, and swore I wouldn't b/c I just felt it wasn't mainstream enough yet. I recently got interested in BL again, and fed up with nitro, and rationalized going BL now. Not sure what I was thinking! This is such a royal PITA! Too complicated! Hopefully though, once I have everything built and running right, I won't have to do anymore maintenance!

lutach · 04.30.2008, 01:00 AM

Quote:

Originally Posted by jhautz

Same setup with the only difference being the 1515 motor with the same kv and I bet you get around the track just as fast and run 20% longer.

I can't compare because I don't have a 1515. I can definitely tell you he'll get to the speed he wants easier with the bigger motor. With the same Kv the 1521 will have much more torque then the 1515 and I'm pretty sure that will reduce the strain on the batteries. That why I'm saying the 1521 will draw less amps then the 1515 with the same Kv.

DrKnow65 · 04.30.2008, 01:03 AM

Sleep easy, any one of those three are STILL NEU's!!!!!!!!!!!!!

You should be very happy with either of them (if you don't believe me pick the worst and send it ot me to see how happy I get :)

lutach · 04.30.2008, 01:22 AM

Quote:

Originally Posted by DrKnow65

Sleep easy, any one of those three are STILL NEU's!!!!!!!!!!!!!

You should be very happy with either of them (if you don't believe me pick the worst and send it ot me to see how happy I get :)

I would like a 1515/2.5D or 1515/1.5Y so I can compare it to the 1521/1Y. I'll send it back after I'm done with the comparison

.

Sower · 04.30.2008, 11:58 AM

Hmm. . . well, sorry - I tried.

SpEEdyBL · 04.30.2008, 07:05 PM

I don't have any experience with the nue motors, but Lutach's logic doesn't make sense. If you gear for the same speed with two motors of the same resistance (no matter the kv differences), you would ideally use the same amount of power, but in reality the 1521 is bigger and heavier, and will take more power to run. Lower kvs mean more torque, but once you gear up to match the speed of the higher kv motor, you lose torque at the wheels (thats what counts) and you increase the current. So why would you NEED a 1521 in the first place? So you can run higher voltage without reducing the current for more power. e.g you can run a 1521 1.5D on 6s which is too much for the equivalent 1515 1.5D.

lutach · 07:43 PM

Quote:

Originally Posted by SpEEdyBL

I don't have any experience with the nue motors, but Lutach's logic doesn't make sense. If you gear for the same speed with two motors of the same resistance (no matter the kv differences), you would ideally use the same amount of power, but in reality the 1521 is bigger and heavier, and will take more power to run. Lower kvs mean more torque, but once you gear up to match the speed of the higher kv motor, you lose torque at the wheels (thats what counts) and you increase the current. So why would you NEED a 1521 in the first place? So you can run higher voltage without reducing the current for more power. e.g you can run a 1521 1.5D on 6s which is too much for the equivalent 1515 1.5D.

I have seen 75A spikes and average of 15A. The bigger motor will produce more torque then the smaller one and will require less AMPs to get moving. I also have found that my Mega that's in my MBX5T consumes less AMPs then a same size and Kv Aveox motor. That's due to the Mega being a 6 pole motor and producing more torque then the Aveox. Before I though it didn't make sense either, but once I saw it for myself, I can definitely say the larger motor will not strain so much to get a heavy truck moving. It's a good experiment to try

.

Edit: Maybe I found the right set up for my BPP truck. I'm not speaking for anyone else, so the best motor that fits the bill will do, but for $20 more, why not try the 1521/1Y.

mk351e · 04.30.2008, 09:41 PM

well gents, today I called CC, and talked to a tech guy about it. He says the the bigger motor will not be more efficient; but actually it makes no difference. Oddly, he recommended I go with the 2200kv 1515 for what I'm trying to do.

So, in the end, I'm going to go with either the 220kv or 2050kv model, cross my fingers, and hope it works out well. I think it well, and I think we may be splitting hairs here, but who knows? I WILL let everyone know how all this turns out for me, and I promise to make a vid!

bdebde · 04.30.2008, 09:56 PM

The 2200 kv 1515 should get ya 60mph. I have a 2300kv Plet for speed runs with my Muggy; it is just stupid fast on 6s, and constantly flipping over backwards. I use the 1700kv 1515 for normal bashing geared about 45mph and it is plenty fast. A Muggy does not handle well at 60mph (45 even gets scary), trust me. Split the difference and get the 2050 kv; you may be able to keep the front end on the ground.

04.30.2008, 11:17 PM

My opinion with the 1521 vs 1515 is that the 1515 size already has more than enough torque to deal with the last thing you need is more.....remember torque is a twisting motion and it will be harder on your drivetrain compenents. With a 1515/1y (2200 KV) it is pretty out of control with 5s, you will would spend a lot of effort trying to make a 6s version drivable