Roc 412 vs pro4 hd

[cneill24]

I'm looking to get a new motor and I want your guys opinion. Im looking at ethier getting a roc 412 2300kv or a pro4 hd 3000kv. They are both awesome motors the only thing that is stopping me is size really. I know they will both fit, but I'm trying to figure out what's the better choice.

[jado6006]

Nobody's answering you cuz this question has been asked, & answered a 100 times. Search it.

[cneill24]

I have looked and your probably talking about the regular pro4 that's all I see compared to the roc. I havent seen a comparison about the pro4 HD and the roc thats why I asked. Thank you

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[stone202]

Wondering the same thing. Only see pro4 vs 412 only as well.

[afrofroggy]

all I will say is this
Holmes TrailMaster BL Pro 540 - 3100kv

[allanon1965]

Originally Posted by afrofroggy

all I will say is this
Holmes TrailMaster BL Pro 540 - 3100kv

+1...... I have this motor and its on par with and in some cases even better than my roc 412 3100kv

[Alexander_0_1]

Hi I'm completely new here, and I had ask myself the same question, I asked my old brain to choose between a pro4 HD and a roc412, and when I looked and the specs, the only thing that swayed my decision towards the pro4 HD was that the shaft is 5mm, as opposed to the roc412 which has a 3.2mm OD shaft. I also like the extra torque a longer can is suppose to provide, with the extra power I geared up slightly.

This is how I made my choice.

[yotapower07]

I have the roc 3100 and the holmes bl 540 3100 the cheaper $45 one. Ran the Holmes in my wraith and after 10-15 minutes of running around the yard giving it a workout it got really hot Geared 54/14. Roc is in scx10 geared 56/10 and barely gets warm. Yes this is more apples to oranges. It really depends what you're running it in and how you will be driving the vehicle. I say if you have the room then go for the pro4hd. It will give you more options for gearing than the slower roc will.

[allanon1965]

Originally Posted by yotapower07

I have the roc 3100 and the holmes bl 540 3100 the cheaper $45 one. Ran the Holmes in my wraith and after 10-15 minutes of running around the yard giving it a workout it got really hot Geared 54/14. Roc is in scx10 geared 56/10 and barely gets warm. Yes this is more apples to oranges. It really depends what you're running it in and how you will be driving the vehicle. I say if you have the room then go for the pro4hd. It will give you more options for gearing than the slower roc will.

if you are going to compare temps, you need to have the same gearing.... the 54/14 is 3.85.... is going to run pretty high temp... 56/10 is 5.60.....will for sure run a lot cooler...

I have the 79.00 HH brushless trail master geared at 56/11 which is 5.09 and it barely gets warm....the roc 412 is gear the same and also barley gets warm...

[Odd-M]

I don't understand why you step away from the Pro4 because of the 5mm shaft. Pinions in all sizes, both 32p and 48p, is available. I run a Pro4 3300kv in my Wraith and it's a hell of a motor. 11/56 and barely gets warm, as smooth as I could dream of with a proper setup esc.

[winnerone23]

I agree allanon.. Gearing has to be the same to put a motor side by side comparison..

I ran the Pro4 4000kv(56/11) in my wraith and loved it! But I couldn't keep rotor's together on 4s..
So I dropped a Trailmaster BL in.. I started with the same gearing.. Now I'm at 54/12 on 4s.. The Trailmaster BL is a Beast!! Even geared this high, it moves my 8lb wraith around at 20mph. Yes, it gets warm/hot.. Tho it had not effected the performance any.. The torque is amazing!
I also run one in my 8lb scx on 4s, geared at 56/11.. It doesn't get nearly as hot and seems to move along just as fast or faster.. (I have to get it in GPS to know)..
I comp with my scx and the low end is just as smooth as another out there. The torque and wheel speed to get you thru our over the rocks, up that hill climb, or over that muddy obstacle!

Now I just picked up a Pro4 HD 3500kv. Which I'm going to drop in for comparison.. The main reason I did this was to test all options and to try and get back to the 26mph, or so, mark.. Why? I dunno, cause I like it! Also so I can give fair info for threads like this one..

Overall.. Unless you plan on or like breaking stuff.. The HH Trailmaster BL has been my go to motor and had done it with the best of them..
Disclaimer: be ready to break stuff anyways.. Cause until you learn how to back out of that bind or full throttle control, the HH Trailmaster has plenty of Powah to break Everything in ur drive train! ;)

[Alexander_0_1]

I chose the pro4 HD mainly for the extra torque, with my extra torque I thought it rather important to strengthen the driveline....starting with a stronger rotor.

[Crank]

Today I ran the Pro4 HD 3000kv on 3s geared 18/56 , 4 2200mah packs... hard in a Yeti and temps on the motor rarely jumped over 100.
Super impressed with this motor.

[Odd-M]

Initally tought of a ROC412 for my next build, but took a look at the Holmes BL Pro. It's seems to be a regular two pole brushless, as most of the regular BL motors out there. How can this compare to a "beefier" four pole, or even be better? Price is favourable though...

[allanon1965]

Originally Posted by Odd-M

Initally tought of a ROC412 for my next build, but took a look at the Holmes BL Pro. It's seems to be a regular two pole brushless, as most of the regular BL motors out there. How can this compare to a "beefier" four pole, or even be better? Price is favourable though...

i cant tell you why the HH BL Pro works as well as it does, but I have both the roc 412 3100kv and the HH BL Pro 3100kv both geared the same in similar rigs and the HH just works amazingly well! For the money, its what I am going to buy next!

[dna4engr]

Getting back to the original question. Roc412 vs. Pro4HD.

5mm shaft - if this becomes an issue in the future on the Roc412, you can put a rotor out of a normal pro4 in there to get a 5mm output

Heat - if geared right neither will be too hot. I have a Holmes BLS540 and I have not found a gearing setup that can get temps below 150* F. JRH says his motor can handle 160 so it isn't damaging the motor. However I just feel more comfortable with my roc412 running at 90*, same gearing in the same rig.

Power - obviously the 550 can will outdo the 412. However, you don't need more than a 412 can put out. Trust me. BLS540 is a torquey little sucker. Really impressive for a 2 pole.

Key item that hasn't been mentioned - RUN TIME - in my comparisons, the 412 is a much more efficient motor than the HD pro4. I have a 3500 HD and it just sucks batteries down even when geared low. It is a great motor but a battery hog. The Holmes BLS540 gives very good run times too.

For the price - everyone is right - the BLS540 is a winner. I need to send mine in for a rebuild as it had a long hard summer and the last time it ran, the MMP in the rig went up in smoke. Don't think it was the motor, but sending it in just the same.

Dna

[Odd-M]

Obviously a 550 can will suck more juice than a similar 540. If you pull it apart the spool is much longer, almost like comparing a 2 liter inline four with a 3 liter straight six. I've got a 550 4000kv 2 pole in my basher and it's the only motor/car I own that stresses batteries. A 5000mah 30C will get pretty hot and I've actually smoked one of them. Previous 540 3500kv 2 pole in the same car, wasn't even near. This motor pulls hard!

Damn, so hard to decide what to get in the jungle of products. Good experience with Pro4 might push me against the costly Tekin again.

[Olle P]

Originally Posted by Odd-M

Obviously a 550 can will suck more juice than a similar 540. If you pull it apart the spool is much longer, almost like comparing a 2 liter inline four with a 3 liter straight six. ...

That's an extremely off comparison.

The longer spools means the wire is longer and therefore will produce more resistance decreasing the current.
With everything else being equal a 550 motor is more efficient than a 540!
I suppose a Pro4 3300Kv will provide similar power to a Pro4HD 3000Kv, but do it with less torque and efficiency.

[Odd-M]

Could you explain that further? Bigger spool means less current, given otherwise same kv? Logically this doesn't make sense to me but.

[allanon1965]

more resistance means less current and more heat...the longer the wire, the more resistance, some of the current is lost in the form of heat due to the higher resistance to current flow...