2650kv in rc8

[Joe Ford]

Finally got a vid of my RC8 that I have set up for speed. Have to shut her down with this gearing and voltage after about 10 minutes, but need to calm down about the same time too so it works. ;)

http://www.youtube.com/watch?v=iLwJD9DQ7FU

Vid of the tamer buggy coming up...set up for racing.

[MustGoFaster]

Joe, your dog is VERY brave!

[Metallover]

Originally Posted by Joe Ford

Finally got a vid of my RC8 that I have set up for speed. Have to shut her down with this gearing and voltage after about 10 minutes, but need to calm down about the same time too so it works. ;)

http://www.youtube.com/watch?v=iLwJD9DQ7FU

Vid of the tamer buggy coming up...set up for racing.

That thing flys!

Can you give us any info on the Castle-Neu 1517?

[pullinteef]

Originally Posted by MustGoFaster

I would suggest a larger pinion (16-18) with the 1512 2D.

Hey Steve, are you still running the 2.5D? What was your gearing? I just got everything back together and took it for a spin at glenwood yesterday. First time out with the MMM. It was a blast, even on such a small track. I'm trying to get ready for Tillsonburg but I think a 16T might be too high. I'll have to do a more controlled test with about 3-5 mins on each pinion and measuring temps. See ya.

[Joe Ford]

It's the 1800kv motor we're testing right now. :) Longer can, more torque...meant for larger/heavier vehicles or for those that don't want to go super fast on 4s..on 6s you can obviously make it "pretty fast".

[phatmonk]

Wow Joe that thing is a rocket.

[Joe Ford]

Will get another vid soon...fully charge the pack (was almost dead in the video), put a 2200kv motor back in, and put the 1/8 rally tires on it. THEN you'll see a rocket.

[phatmonk]

Joe maybe you can answer this question why is the 2650 max voltage 16.8 when the Neu 1515/1.5d with a 2700 kv max is 22.2 volts.

[Joe Ford]

A few reasons...one the 2650 is comparable to a 1512 series motor, not 1515 (that's the 2200). Being shorter, it can't handle the wattage that a 1515 can, and will have a tendency to overheat in 6s car applications...which we won't warranty. Second, those charts were made for the airplane guys originally...airplanes don't put the same strain on a motor that a car application does and they generally get much better airflow than an rc car/truck does....again, higher tendency to overheat if you don't know what you're doing. And lastly, but probably the most important (should have listed it first ;) ) is that at anything above 22.64v under load your motor is above the 60,000rpm limit...we want to minimize the risk of problems for our customers. In airplanes we RARELY need 60,000 motor rpms to get great performance...it is much easier to damage a motor from RPM in a car than a plane IMO. Only had one magnet fly apart in a plane (and it was my fault...ran my motor too fast in my pylon plane...but that's the point...all out speed)...can't tell you how many I've split in car applications, and on some of them I wasn't even trying to go fast. Demag the motor much easier in cars, and when that happens they speed up more and more til they come apart.

[Arct1k]

I must say I have to call you on this it is a bit of a sneaky change the 2650KV was originally listed on the site as 6s 22v the same as the 2200kv.

Reducing it to only 4s is a bit cheaky IMO - First time I've personally seem Castle do such a think.

I've already run mine on 5s.

[SpEEdyBL]

I run mine on 5s as well w/o problems and its the same rpm as the 2200 on 6s. Change the voltage limit of the 2650 to 5s. That would make more sense - unless there is something you are not telling us (why a 1515 size motor would handle more rpm)???

[Joe Ford]

Originally Posted by Arct1k

I must say I have to call you on this it is a bit of a sneaky change the 2650KV was originally listed on the site as 6s 22v the same as the 2200kv.

Reducing it to only 4s is a bit cheaky IMO - First time I've personally seem Castle do such a think.

I've already run mine on 5s.

That's because the guy who does our website put in the wrong info. Nothing sneaky about it Art. And we don't care what you run it on, but if it fries we won't cover it under warranty. Re-read Pat's post. http://www.rc-monster.com/forum/show...3&postcount=45

[Joe Ford]

Originally Posted by SpEEdyBL

I run mine on 5s as well w/o problems and its the same rpm as the 2200 on 6s. Change the voltage limit of the 2650 to 5s. That would make more sense - unless there is something you are not telling us (why a 1515 size motor would handle more rpm)???

Guys this is NOT GOING TO BE DEBATED. FOLLOW THE RULES OR PAY WHEN YOU BREAK IT...PERIOD! WE ARE NOT GOING TO CHANGE OUR RATINGS SO YOU BETTER DECIDE WHETHER YOU WANT TO PAY IF SOMETHING HAPPENS OR NOT!!!

READ PATRICKS POST...IF THAT ISN'T CLEAR ENOUGH YOU'VE GOT BIGGER PROBLEMS...

Speedy...you need to re-read post #39...NOWHERE in there did I say that 5s on a 2650 is over 60k. I said that on 6s at anything over 22.64v under load it would be over 60k. You also need to re-read the part about the wattage handling ability of the shorter motor being less than that of the longer can motor, and how this can cause motor failures IF THE PERSON DOESN'T KNOW WHAT THEY'RE DOING. We want people to succeed...if they follow what we say they will. If you guys want to experiment that's your prerogative, but expect to pay for it if you break it...again read Patrick's post!

[bruce750i]

I think I'm picking up what he's putting down.

[Arct1k]

Joe I've never had any issues with the castle warrantee or service - I was just a little shocked by the change in that it wasn't positioned as a "service bulletin" the previously quoted spec was incorrect.

It was not intended to start a debate about the change (i'm sure you've tested extensively and decided on this limit for a reason) it was more that the change hasn't been published widely.

I'm probably in the minority Joe as I've had the motors for a while - I see that tower esc has the corrected spec - so more that I havn't looked at them for a while...

I'll stick to 4s in future :)