Fastest Motor on 6s?
 

So after a little break from R/C to build a supercharged Mustang, I am back in the game and building another Revo....but I want to build it just for speed runs, seeing if I can top 90mph soooo.....what is the best/fastest motor to do this on 6s? From some of the reading I've been doing, it looks like a 1512 1.5d is about right, but I am open to anything.

Thanks in advance!

neu 1527 1D. Go big or go home. A 1512 is way too small to do speed runs reliably in a revo.

But I doubt you could get it to fit in a revo.

@Kevlar: 1512 1.5d is rated for 18V. If you're going to get a Neu motor specific for this application - I'd go with 1518 1.5d (2340kv).

I'm not leaning towards any brand in particular, I loved my pletty in the last revo, and found it to be pretty fast, cost doesnt matter just looking to buy one motor without regrets. Also, making something fit doesnt bother me either, part of my build plan is to make a carbon fiber motor mount, so I can change things up from there.

Last revo:

http://i417.photobucket.com/albums/p...o/DSC01261.jpg

http://i417.photobucket.com/albums/p...Revo/042-2.jpg

Hey there Kevlar,

I ( just ) managed to fit a 1521/1D in my E-Revo. That would definitely get you to 100mph if you take things one step at a time. If you've not too concerned with fitting into the standard revo chassis / layout then a 1527/1D would be ya baby. There are various other motors available that would work nicely for you, specifically from Tenshock and Leopard. TBH, I wouldn't bother looking any further than those three.

Shoot me a PM an' I'll try to help you avoid too many expensive mistakes. :yes:

Cheerz!

R:eyes:tz

Unless you want to raise the motor up above the rear shocks - or make an extended chassis - you are somewhat limited on motor length. That's all I was saying.

I see what you were saying Brian, I was thinking of going over the shocks if needs be, but we'll see. I have all winter to plan and build this, won't be able to really test it until april or may...gotta love Canadian winters!

Rootz - PM on it's way!

Thanks again

a 1521 1D sounds like the ticket then. (for 6s) They no longer manufacture the 1518 brian was talking about.

Also, if money isn't an object why not step up to a mamba xl and go with 8s? 100mph would be easy with 8s. I run a 1521 with a mamba xl in my e-maxx, it is stupid powerful.

I didn't know that - CC still has them listed on their site, but I see that Neu no longer lists them on theirs.

How about a CC 1518 (still some floating around) on 8s?

Absolutely! I'd say the Mamba XL would be the one to go for. I started with a Mamba Monster and then a Phoenix HV110 as I was going High Voltage. The Phoenix didn't last long and Castle didn't have anything else so I went for MGM-Compro ( 125A / 45V ). MGM-Compro are excellent speedo's but the manuals take some getting used to. If you wanna look into that option, the TMM28026 or TMM16026 X-series would be the ones to look at. The bigger ones are HUGE!!

http://mgm-compro.com/index.php?cat=...llers-x-series

Fact is, the Mamba XL is so easy to set up, it's got such good data logging and CC's service is so good there's really not much point looking elsewhere. Course, that's just my opinion.:whistle:

Oh yeah! Make sure you aren't tempted to get a used Mamba XL Version 1..

http://www.castlecreations.com/suppo...ydraicehv.html

How about batteries??

Cheerz!

R:eyes:tz

You all lose:

[youtube]xP17Bg40cso[/youtube]

1515 1.5D 2700kv + 6s lipo = 90mph+

:yes:

^^ That's the one I got my motivation from!

I really like Thunderpower lipos, seemed to pack a great punch...I wanted to keep it to 6s to be comparable to the above (Overrevo I think) and didn't want to do another big battery tray mod...but am open to anything.

Lot to think about, but for now I have to get ready for my Guy Fawkes party!

Remember remember the 5th of November....

Ah yeah Neil. But that's as fast as it went and Kevlar wants to go faster.:na:

Didn't know they celebrated Guy Fawkes Night in Canada. Thought we were the only folks who burned people in effigy for the kids!

Cheerz!

R:eyes:tz

i have one new in box that i'm selling :whistle:

Are you planning to try your luck at the UK RC Speed Championships? First practice event will be in May 2012. Check out www.rossa.org.uk for details

Cheers

I won't be coming to the UK any time soon, that would be nice though! So I am leaning away from any 8s due to compartment sizes and keep it level with the 91.2mph, other than motor pick. Any thoughts on the pletty biggmaximum? My last one was a beast on 6s

You're welcome over here any time Kev! - Hi Tony, BTW

Hmmm. Well batteries will always be an issue if you're going to use the standard E-Revo chassis / battery compartments. You might, ( Just! ) be able to get 8S in there if you used Revtech's Double Deuce LiPo's.

Don't know much about Plettenberg. When I researched them, they seemed overweight for the power and overpriced but a lot of people seem to love 'em.

Cheerz!

R:eyes:tz

^Pretty much ditto. The Pletts are certainly quality motors, but they are rather heavy and large ( built-in heatsink )- a 1515 sized Neu is just as powerful and cheaper, and has a range of kv choices vs the Plett BigMaxximum which comes only in 2300kv flavour..

Well I have decided to go with the same one, 1515 1.5D, to keep it even with the champ then go from there.

So what about the extras when ordering a Neu? I want to go finned, what about the 10 wind adder and 8mm shaft? Worth it or even needed?

OoohKay! :oh:

5mm shaft is probably best - Easier to get pinions. Not sure about the 10 wind adder. The smooth can is $200 at Offshore Electrics.

Cheerz!

R:eyes:tz

for a revo I think a leopard 5692 is a good election for arrive at 100mph .........

Really? How exactly would you make it fit in a revo?

Interesting point, Brian.

Also, the motor on the standard E-Revo is mounted quite high up so it's not a bad idea to have a light motor. The 5692 is a great motor but I can't help thinking that it would upset the handling.

Cheerz!

R:eyes:tz

of course will need make another optional motor mount and use very big pinions .... but if he put this motor on a revo is sure will have all the power need for arrive at this crazy speeds

another option is use a smaller motors same than the 4082 ...... but will have much lower power ......

is her decission .... :whip:

Is that you Miquel??

Sorry, putting a 5692 into a revo is a stupid idea.

I would worry about the rotor shattering at full throttle- that's a fat rotor, and given the rpm limit imposed by Castle for the 1717 & 2028 motors, the 5692 may not like 40,000rpms+ very much. A longer rotor seems preferable to a fatter one at these speeds, given a 1515 diameter & length is more than enough for 90mph.. :neutral:

Weeell, I s'pose, if you need something to worry about, that's as good a thing as any. :intello:

If you really want to go fast, though, there seems little point to me in looking beyond Neu ( as opposed to Neu/Castle) or Tenshock.

Sorry Brian? Did you say YOU THINK it's a stupid idea?

Personally, I feel that throwing yourself out of an aeroplane ( with or without a back-pack full of laundry ) is not a very clever idea. However, I wouldn't seek to criticise anyone who chose to suggest it, or, in fact decided to do it.

Then please actually explain HOW the 5692 is going to fit and WHY a motor of that size is needed?
Who is going to draw a diagram, with measurements, and show how the 5692 is going to fit, with its large diameter and length that will be too long to fit with the rear shocks in place in the e-revo (unless you don't need those)?

I will criticize those who constantly give advice that is impractical and unhelpful.

Rootzman, do you think the OP should go out and buy a 5692 and then try to fit it in a revo on the advice given in this thread? Please explain.


So please be specific - to clear the rear shocks and mesh with the e-revo tranny spur with this very large diameter motor - what size pinion would the OP need to make this work? Do you know? Can you provide a link to someone who has made this work?

Brian, I wasn't suggesting that anybody fit a 5692 into an E-Revo, although, I have seen one fitted into a 1/8 scale buggy so wouldn't say it was impossible. Nor was I recommending it. I think that I've already said my piece on motor choice in this thread. I was simply pointing out TO YOU that, when you express an opinion, I feel you should make plain that it is just that. An opinion. To state that a particular action is "a stupid idea" is neither helpful nor respectful to other forum members.

You state that you "will criticize those who constantly give advice that is impractical and unhelpful." Once again, this is a matter of opinion. I'm not sure whether you were referring to the contributions of our fellow forum member X-Y but I assume his/her contributions are sincere, even if they do seem somewhat over-ambitious. If you are justified in your assertions then I would be equally justified in calling your contributions spurious, erroneous, pompous, self-important, puffed-up, small-minded etc, which, of course, I would not dream of doing. I am simply suggesting that, when offering your opinions of the contributions of other forum members, it might generate more light than heat if you were to maintain a respectful tone and restrict yourself to statements of proven fact.

if you search arrive at 90-100mph using a monster of 5-6kg you will need MUUUUUUCCCCHHHHHH POWER ....... sincerely I think is IMPOSSIBLE arrive at this speeds using a motor of 400-500gr ...... simply because I tested more than 30 motors and Im sure what is possible using a motor of 400gr-500gr .....

everybody have her opinion ........ and everybody have her EXPERIENCES ...... nothing more ...... I dont search discuss ...... if you think is better use a 1515 or 1518 for me is not a problem ...... is your opinion :D

regards

Putting that motor in a revo is impractical for many reasons including the shear size. You also can't compare a flat chassis truggy to the revo chassis when doing something of this nature.

A motor that size is also not needed to reach 100 in an e-revo. Many of the options already suggested would be a good start. Either way it's something that will take some experimentation to get right and more than just the motor mount and size needs to be in the equation.

RootzMan, we all know that much of what is on here is a matter of opinion so no need beating the subject to prove whatever point or feeling you have about it. You do have to keep in mind that most of the people here are offering their opinions based on personal experience and facts which goes much further than just someone stating their opinion who has never tried any of this before.

Thanks for chiming in TexasSP. Not that it's my thread but anyway...A couple of points:

1) Don't recall anyone saying anything about a truggy

2) If it were that easy to get an E-Revo up to 100mph, I'm pretty sure that somebody would have done it already. To my knowledge, no body has. I have spent a great deal of time and money trying and not succeeded. Have you?

3) The only point that I was making is that I believe people should not call each other stupid and that they should not state their opinions as fact. For sure, many of our forum brethren state their opinions as fact. If you feel the need to defend them then quite frankly I think you are promoting narrow-mindedness and dogma whereas, I would imagine that forums exist to further understanding, rather than limit it. Surely, if some body has an opinion that they can back up with experience, their opinion would be all the more credible if they were to share their experience.

4) I have some knowledge of the achievements of our fellow contributor X-Y and, I can tell you that there is no doubt in my mind that he knows far more about speed racing electric RC's in general than all but a handful of people Worldwide. His English may not be great but his engineering is.

Now, I propose we return to the subject at hand; The not inconsiderable matter of propelling Kevlar's Revo to 100mph and above.

So, Kev. Any progress?

It seems that most attempts at very high speeds boil down to "throw more power at it". Sure, you can make a brick fly with enough power. But someone should come up with a better way to utilize the power we already have. Gearing up high enough to achieve 100mph+ speeds is hard on the ESC, and you still have to wind that motor out. Two-speed transmissions aren't great because of that torque change at the shift point (tried it - didn't like it). Too bad someone couldn't come up with a reliable, lightweight, and relatively inexpensive CVT setup; would provide better off the line control and power, yet keep the acceleration smooth and motor in its ideal "power band" to take full advantage of a motor's capabilities without stressing everything so much.

Certainly, when it comes to a brick like the E-Revo, I can't think of a whole lot that can (practically) be done to reduce the requirement for significant levels of power output.

Above around 70mph, aerodynamics starts to play its part and, if one is contesting an open-wheel record, one is forced to make a trade-off between grip and drag. The wider the tyres, the more grip you'll have but the more drag they'll cause. Worth pointing out that speed racing is essentially drag racing by another name and over a longer distance, since we are limited by eyesight and radio control range. Of course, there is the option of an FPV camera system but, as far as I'm aware, no body has successfully implemented such a system on a speed run car.

So, we're back to drag racing over some 700 or so feet which is already beyond the limit of eyesight. One thing that is rarely realised is that, at some point, drag will probably take over. The amount of drag holding the vehicle back with become close to the mechanical grip pushing it forwards and the nett result will be that, no matter how much power you have, your tyres will start to lose their grip. It's just like holding the vehicle against a wall except you're already going fast and it's very easy to lose control.

There are designs for small, light-weight CVT's but, so far as I'm aware, nobody makes one small enough to use (yet!). One area for development is electronic traction control, which I'm currently working on. It's not as easy as it may seem and besides, when the drag takes over, traction control would simply prevent the vehicle from accelerating. It would only be useful in an ultra-low-drag vehicle.

Below 70mph, the best thing you can do is reduce weight as much as possible, while increasing power and strength. This will increase acceleration but take it from me, the faster you go, the more likely you are to lose control. And the more damage will be done when you do. Unless you have an unlimited budget, there's another trade-off between weight and durability.

For the record, my solutions to these problems were:

1) Reduce aerodynamic drag: Built a Revo-based body shell which extended down to a splitter close to the ground and was trimmed to minimise the amount of air negotiating the suspension arms. Also reduced frontal area by narrowing the track using Slayer arms.

2) Grip: Produced a set of foam tyre/wheel combo's. Also used specially reinforced HPI Phaltline tyres on Blast wheels. In the end, the foams were best at the rear and the Phaltlines at the front.

My avatar gives you an idea of the end result.

I think that the "best way to utilise the power we already have" is exemplified by Tim Smith's JC Dragworx dragster which has managed 179mph in practice on 6S, although, at a recent speed run meeting, Tim "only" managed 143mph with no front tyres! This car has also managed to achieve 119mph on 2S. It's very light. Very streamlined and has loads of grip. Power is probably somewhere around 2.5-3KW. Here's a pic...

http://s1126.photobucket.com/albums/...Picture018.jpg

The way I see it is this.

Big 2 pole and 4 pole motors will be maxed out at 50-60k rpm. So you pick your kv poison based on your available voltage. Keep the weight down and you will need less torque, which translates to less needed amperage. So a smaller/shorter motor can work.

Use thick wiring and good connectors. Keep the wires as short as possible, but enough to flex a bit.

Based off my experience in my smaller cars, I would say a 1515 is too small of a motor to turn those big tires at 60k motor rpm, for record breaking speeds. I would stay with a motor in the same diameter, but choose a longer can version like a 1518, or 1521 to gain the torque to turn a bigger gear.

Makes a load of sense snellemin. Course, I would say that as I'd already suggested a Neu 1521. :whistle:

Mind you, I'm moving toward sensored at the moment, so the next motor destined for my E-Revo will be a Novak Ballistic 8L - When they finally release it!:yes:

Now I've just gotta choose between an RX8, an LRP iX8 and Novak's new Kinetic 8. depends how patient I can be!

Your right rootz, you have the only opinion and experience that matters. Have fun with that.

If it where me, I would follow snellemin's advice and also use a smaller wheel/tire combo. I would probably make my own tires and put them on short course wheels. Hitting that speed will take an immense amount of custom work not matter what. Personally, I would pay close attention to the land speed record holders body styles and how they setup their vehicles.

I have no idea how you get the impression that I think my experience matters more than any other. I can only imagine that you didn't read my posts correctly. I think no such thing and am always prepared to learn from people who's open minds and creative character have allowed them to explore new ground.

Correct me if I'm wrong but it seems to me that snellemin's only post in this thread concerns motor choice and nothing about wheels or tyres. I find that a useful maxim is always to read 3 times before typing.

Strange how you now state that hitting 100mph will take immense effort when your previous post implied that it was easy. And if you think it's easy to make tyres, I suggest you do so. You may find it harder than you think.

Your suggestion that short-course-based wheels would be suitable as a basis for a speed-run wheel is very interesting, if somewhat misguided. I'm not sure why you chose short course. I tried buggy wheels with on-road tyres ( inconclusively )...

http://i275.photobucket.com/albums/j...-Mighty013.jpg

However, I'm not convinced short-course wheels would be an improvement. Unless you have a persuasive argument.