RC-Monster Forums - Which Controller for My Application?

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Which Controller for My Application?

So I wanna run a 22.2v system w/ a Lehner 3100XL (maybe the 2800XL) in my non-bling maxx (meaning, its lighter than stock :D ). My requirements are to go fast (just under 50 mph) on a big track for a long time (up to :30 minutes). Probably not an uncommon desire/request.

I'm definately going LiPo. I think the TP8000-3S4P (*2) is the ticket (22.2v, 8000mah).

I'm looking at the BK controllers. The 9918 for its price ($200 less then the next step up which is $400) *might* work for me. But w/ ambient temps in So. Cal @ 100F-110F I need a controller that's not going to faint, but I of course don't wanna pay for total and complete overkill either.

18120 - 22.2v seems like this controller will be at its voltage limit, what effect will running a long race have on it?

30120 - limited to 42000rpm? yuk

18150 - see voltage issue w/ 18120

30150 - limited to 42000rpm also.

I think I'd feel more comfortable w/ something like a "20120" that doesn't have a 42000rpm rev limit.

Not sure which controller I should get. Any suggestions?

tia

You might find the answer here;

All the BK/Lehner controllers that suit 18 cells can be used on 20 cells

and the 30 cell controllers can be used on 36 cells

The RPM limit is a matter of time. The 42000 rpm limit is weird, Some contradictions are rising questionmarks in my head at this moment about this;

It's about the hardware rev. rev1 = 12 mhz, rev2 = 24 mhz. The 12mhz= 42k limited. i guess it's a matter of the used transistors/fetts, that can't be used on this frequency, or the 24mhz gives a electronical noise in what way ever.

if you see this and this data/information sheets, you will see that the micro controller is able to kick out some more rpm's.. (Mike is asking BK, when this limit will be gone though)

You need some kind of alarm, that tells you when the lipoly voltage drops bellow the 3V/cell It will shorten the lifespan of your lipo badly if you don't keep a close eye on it.

As rene said, the 18 cell controllers are approved for 20 cells, so you won't have any trouble with that area. I have run 22.2 volts through my warrior with no problems. I wouldn't go with such a hot motor, though. I use an xl2400 and it is almost too fast for the track on 18.5 volts. For 22.2 volts, I would use an xl2000 motor (or maybe even an xl1600). The warrior will handle the voltage on either of these motors just fine - even in So-Cal. Trust me when I say the xl3100 is too much motor for that voltage.

They reached 50 mph on 12 cells with the XL3100.. (14.4 V vs 22.2.. )

I cant imagine 50 mph - in an emaxx - and forget about 50 on a track.

measured with GPS, by two or three different people. allmost complete stockmaxx, made it a bit lighter, with other wheels/dropped the shifting servo.

There is a thread about it on maxxtraxx, it goes by the name '49,7 mph on 12 cells' or something like that.

Also confirmed and tested by a user that is/was on this board, Promod. I can believe it, because 12 GP3300's can throw out 1200 watts. that's about 1,5 bhp, with 10 percent lost of the motor/controller.

I don't think these people are not serious.

Thanks one and all for the info. I have some follow up questions, if you will.

Quote:

Serum
You need some kind of alarm, that tells you when the lipoly voltage drops bellow the 3V/cell It will shorten the lifespan of your lipo badly if you don't keep a close eye on it.

Agreed, too big an investment to lose. Any recommendation on an audible alarm or cutoff? I found this, small, light, and inexpensive -> http://www.customidea.com/hrpolyx.php

I'm not gonna mess w/ the rpm issue and the 30xxx series. I'll probably go w/ the 18120.

Quote:

RC-Monster Mike
As rene said, the 18 cell controllers are approved for 20 cells, so you won't have any trouble with that area. I have run 22.2 volts through my warrior with no problems. I wouldn't go with such a hot motor, though. I use an xl2400 and it is almost too fast for the track on 18.5 volts. For 22.2 volts, I would use an xl2000 motor (or maybe even an xl1600). The warrior will handle the voltage on either of these motors just fine - even in So-Cal. Trust me when I say the xl3100 is too much motor for that voltage.

The track I race on is rather large. Wide, long, long straights, etc. I don't envision 50mph except for the main straight...and that's only when I'm properly hooked up (i.e. , straight). I would like the potential for 50mph because I'd like to push the limits.

When you say its too much motor do you mean the 3100 will not be capable of pushing an 8-9 pound truck or that it'll spin out of the can at those RPM's (:D )? (technically by about 3,000 rpm...if I ever hit the max).

If I go w/ a lower RPM/v motor I'll get more torque and less top end. I can tell you that twin Titan's w/ 14 (16.8v) matched gp3300's is more than sufficient torque for my truck...anymore and I'm riding wheelies and increasing wheel spin. So based on the weight loss of 1 Titan motor (10oz?) and 3oz off another (replaced w/ Lehner) I don't believe more torque is necessary.

btw, anybody have good numbers on the stock 550's? I'm curious about their ratings.

thx in advance for the comments! I'm just trying to make sure I get exactly (or at least very close) to what I want.

Another consideration for lipo discharge cut-off:
http://www2.towerhobbies.com/cgi-bin...3&I=LXJDJ0&P=K
FMA Direct Auto Cell Detect/Low Volt Cut-Off Device

A device designed for that, specifically.

Quote:

Originally posted by Batfish
Another consideration for lipo discharge cut-off:
http://www2.towerhobbies.com/cgi-bin...3&I=LXJDJ0&P=K
FMA Direct Auto Cell Detect/Low Volt Cut-Off Device

A device designed for that, specifically.

Cool, I'll add that to my list.

If anybody has experience w/ these things I'd love to hear about 'em.

I don't know what your timing is like, but I plan to have 2 Kokam 3s 3200 packs with that low voltage cut-off device on or before next Thursday, 5/26. I'll install and report back after that.

Increased torque is not optional with high voltage brushless motors! It will happen no matter what. The xl3100 will run a bit hot at that voltage and will be too powerful to handle in my opinion. As I said, the xl2400 on 22.2 volts will achieve your speed desires with the proper gearing, but will run cooler. The xl2000 would be my choice. ASgain, this will provide plenty of speed/power, but will have better runtimes and cooler operation vs. the xl3100. I doubt you will see 50 mph on a racetrack anyways (40mph if your lucky).

Quote:

Originally posted by Batfish
I don't know what your timing is like, but I plan to have 2 Kokam 3s 3200 packs with that low voltage cut-off device on or before next Thursday, 5/26. I'll install and report back after that.

Excellent.

I'm going to purchase my motor and speed control sometime this week. My LiPo decision will be made in a couple of weeks. I'm interested to see how well this thing works for you.

thx!

Quote:

Originally posted by RC-Monster Mike
Increased torque is not optional with high voltage brushless motors! It will happen no matter what.

Granted. But I don't need excessive oz-in...which is why I've read about other's experiences (which are very subjective and relative to many person dependent variables) and graph motor performance w/ various voltage/current combinations. Oddly enough I'm thinking the Lehner's are a great choice (based on user experience) even though I can't put their specs into my calculator.

Quote:

Originally posted by RC-Monster Mike
The xl3100 will run a bit hot at that voltage and will be too powerful to handle in my opinion. As I said, the xl2400 on 22.2 volts will achieve your speed desires with the proper gearing, but will run cooler. The xl2000 would be my choice. ASgain, this will provide plenty of speed/power, but will have better runtimes and cooler operation vs. the xl3100. I doubt you will see 50 mph on a racetrack anyways (40mph if your lucky).

I don't wanna run my motor too hot as I'd like to run in the long mains, so I'll bump it down to the 2800.

I'll stick w/ the stock gearing for now and see how I like the performance & runtime.

The LiPo's and speed control are the expensive components, I don't mind getting a different motor to alter speed/torque/runtime/temps if I don't like the 2800. :)

thx!

Even the 2800 will be quite warm with that voltage. Most motors are at their highest efficiency(lowest heat generated through inefficiency) in the 30-40k rpm range. Of course, it is your choice. The 2800 will be quite the animal on 22.2 volts. I think you are perhaps underestimating the power you will have. Be sure to get some video! The truck is going to scream!

Quote:

Originally posted by RC-Monster Mike
Even the 2800 will be quite warm with that voltage. Most motors are at their highest efficiency(lowest heat generated through inefficiency) in the 30-40k rpm range. Of course, it is your choice. The 2800 will be quite the animal on 22.2 volts. I think you are perhaps underestimating the power you will have. Be sure to get some video! The truck is going to scream!

I have a box *full* of extra stock Traxxas parts...mostly lower control arms and bulkheads. :D

thx again for your help. I'll put my order in tonight or tomorrow morning.

Make sure cvds and upgraded center drive shafts, diffs and an upgraded tranny idler gear make the list. You WILL need these parts with this kind of power.

What do you guys think of the batteries he chose? Im thinking of getting me a set of those Thunder Power as well........

Quote:

Originally posted by C.H.U.D.
I have a box *full* of extra stock Traxxas parts...mostly lower control arms and bulkheads. :D

thx again for your help. I'll put my order in tonight or tomorrow morning.

Your putting this system in a stock truck?!?! Your Drivetrain is gonna get eaten alive with that much voltage going through that motor. I sure hope your drivetrain has been upgraded to handle this power, if not you may want to consider it.

Take a couple of pics of the diff gears when you get done - LOL - The power that thing is going to put to the stock drivetrain will be insane.

Quote:

Originally posted by HotnCold
Take a couple of pics of the diff gears when you get done - LOL - The power that thing is going to put to the stock drivetrain will be insane.

Anybody like Twizzlers?

The drivetrain will be on order this week or next.

Quote:

Originally posted by RC-Monster Mike
Increased torque is not optional with high voltage brushless motors! It will happen no matter what. The xl3100 will run a bit hot at that voltage and will be too powerful to handle in my opinion. As I said, the xl2400 on 22.2 volts will achieve your speed desires with the proper gearing, but will run cooler. The xl2000 would be my choice. ASgain, this will provide plenty of speed/power, but will have better runtimes and cooler operation vs. the xl3100. I doubt you will see 50 mph on a racetrack anyways (40mph if your lucky).

Hey Mike you say both the xl2000 and xl2400 are great at 22.2 volts but you prefer the xl2000,whats the performance difference between these two motors? Thanks

The XL2000 will give you a better runtime, the 2400 will hit 50000 rpms, the XL2000 is a bit easier on both your controller and drivetrain. The 2400 will draw much more current as well. You can gear the 2000 a bit higher than the 2400.

Lehner calculates the kv of the motor under load, unlike Feigao.

Serum pretty much spoke my mind to the tee(thanks, Rene!). The xl2000 is a better choice for this voltage. your drive train will need the mods regardless of the motor you go with.

Thanks for all the input.

I think the key factor I need to consider is that (as Mike indicated) Lehner measures Kv under load. 50000 RPM is where I want to be (based on final drive and weight) so I'll make the 2400 (22.2v*2400=53280) my baseline and move up or down from there.

thx!

Whats the 2400 equivalent on a feigao, 7XL or 8XL.... CHUD, what kind of chassis do ou have? those packs are pretty big....

9L or 13s would be the closest feigao equivilent

Quote:

Originally posted by luihed
Whats the 2400 equivalent on a feigao, 7XL or 8XL.... CHUD, what kind of chassis do ou have? those packs are pretty big....

I have a g-maxx CF chassis. The battery packs I want are

(W)50mm x (L)185mm x (H)29mm

or

(W)2in. x (L)7.3in. x (H)1.1in.

I will need to go EXT chassis if I can't get the pack under the steering servo (its very close, so I'll have to get a pack in my hands to get a real measurment). Nonetheless I'll be building custom battery cups out of fiberglass to hold whichever packs I end up purchasing.

Actually I'm still debating whether or not I want the 8000mah or something less (less weight). The 8000mah are 16.6oz, slightly more than 7-cell 3300's. 4000mah are half that. The weight of the 8000mah may be a diminishing return in runtime.

With the motor and battery weight reducation of the 4000's (as long as I don't go too crazy on the motor :D) my truck will be a good performer...w/ regards to runtime that is. My goal is to run a 30 minute main w/ the nitro's. I don't believe w/ the speed I want the 4000's will be enough.

'sides, I'm looking more towards the edge of the envelope (not the total edge, though) in performance than the "safe" known good configurations. Pushing it is the best way to find the "bottleneck" (if you will). Fixing that bottleneck will lead you to the next bottleneck, so on and so forth.

There's a sweet spot combination of weight, mah, voltage, rpm/v, drive ratio, etc. You only get there by calculating, testing, and measuring.

Mostly this crap is just fun to me.

I am right there with you! I don't think you will get a 30 minute runtime with 4000mah packs without a battery change or so. If you use high enough voltage, you can get a pretty good runtime with 4000 mah, especially on a short track with low gearing. For a 30 minute main, you will also have the challenge of keeping the motor cool (think fan, heatsink etc.), especially in the summer. A large motor should be in the cards (larger than the "s" Feigao or basic xl). I am thinking "xl" or a nice 1940 Lehner.

Quote:

Originally posted by RC-Monster Mike
9L or 13s would be the closest feigao equivilent

I dont get it..... the 9L and 13s are smaller motors than the 7XL and I thought the 7XL is too hot for 20 cells:C: .... I have a 7XL right now, can I run 22.2v on it?

Im definately gonna run 22.2v lipo too but I still dont have a clue to what motor will give me the fasted speed..... I know its 2400 or 2000 for teh lehner or 8XL for the feigao, but for some reason 2000 or 2400 is not the same as 8XL..... Im too confused.....:C:

Quote:

Originally posted by luihed
I dont get it..... the 9L and 13s are smaller motors than the 7XL and I thought the 7XL is too hot for 20 cells:C: .... I have a 7XL right now, can I run 22.2v on it?

Im definately gonna run 22.2v lipo too but I still dont have a clue to what motor will give me the fasted speed..... I know its 2400 or 2000 for teh lehner or 8XL for the feigao, but for some reason 2000 or 2400 is not the same as 8XL..... Im too confused.....:C:

The problem w/ choosing a voltage, amperage, motor, speed control, yadda yadda yadda is that each of the aforementioned (and many more items like weight, resistance, ambient temp, final drive ratio, etc.) factor in to how your truck/car will perform.

The motor has several factors alone that you may consider when choosing the correct one. Such as its efficiency at a particular voltage/rpm, the amount of torque it puts out, max rpm's, total horsepower, etc.

I have some data for the 7XL at 14.4 and 22.2 volts. I'm still working on this calculator and it definately needs some input/output tuning, but maybe the following numbers will give you an idea of what these motors can do. For comparison purposes I put the Feigao 7XL @ 14.4v and 22.2v. Also listed is the Plettenberg MAXXimum @ 22.2v.

Remember that these are just numbers, your mileage may vary.

btw, I believe the Feigao's are rated at 50000 max rpm's. You'll see that 22.2v puts you just above that. Of course depending on many factors you'll probably not get to 50000 rpm's.

If something looks fishy about the numbers below lemme know. I haven't looked at my calculator in a while, but I know that it can use some improvements.

Feigao 7XL @ 14.4v
~~ [14.4 volts, 30 amps] ~~
voltageconstant: .0060
Kt: .0080 (oz-In/I)
rpm: 33900.6240
powerin: 432.0 watts
powerout: 362.9160 watts
HP: .4864
efficiency: 84.00%
torque: 13.44 oz-in

~~ [14.4 volts, 40 amps] ~~
voltageconstant: .0060
Kt: .0080 (oz-In/I)
rpm: 33767.2320
powerin: 576.0 watts
powerout: 503.2480 watts
HP: .6745
efficiency: 87.00%
torque: 19.20 oz-in

~~ [14.4 volts, 50 amps] ~~
voltageconstant: .0060
Kt: .0080 (oz-In/I)
rpm: 33633.8400
powerin: 720.0 watts
powerout: 642.4600 watts
HP: .8612
efficiency: 89.00%
torque: 24.96 oz-in

~~ [14.4 volts, 60 amps] ~~
voltageconstant: .0060
Kt: .0080 (oz-In/I)
rpm: 33500.4480
powerin: 864.0 watts
powerout: 780.5520 watts
HP: 1.0463
efficiency: 90.00%
torque: 30.72 oz-in

~~ [14.4 volts, 70 amps] ~~
voltageconstant: .0060
Kt: .0080 (oz-In/I)
rpm: 33367.0560
powerin: 1008.0 watts
powerout: 917.5240 watts
HP: 1.2299
efficiency: 91.00%
torque: 36.48 oz-in

~~ [14.4 volts, 80 amps] ~~
voltageconstant: .0060
Kt: .0080 (oz-In/I)
rpm: 33233.6640
powerin: 1152.0 watts
powerout: 1053.3760 watts
HP: 1.4120
efficiency: 91.00%
torque: 42.24 oz-in

~~ [14.4 volts, 90 amps] ~~
voltageconstant: .0060
Kt: .0080 (oz-In/I)
rpm: 33100.2720
powerin: 1296.0 watts
powerout: 1188.1080 watts
HP: 1.5926
efficiency: 91.00%
torque: 48.00 oz-in

~~ [14.4 volts, 100 amps] ~~
voltageconstant: .0060
Kt: .0080 (oz-In/I)
rpm: 32966.8800
powerin: 1440.0 watts
powerout: 1321.7200 watts
HP: 1.7717
efficiency: 91.00%
torque: 53.76 oz-in

Feigao 7XL @ 22.2v
~~ [22.2 volts, 30 amps] ~~
voltageconstant: .0093
Kt: .0125 (oz-In/I)
rpm: 52480.2240
powerin: 666.0 watts
powerout: 561.8160 watts
HP: .7531
efficiency: 84.00%
torque: 13.44 oz-in

~~ [22.2 volts, 40 amps] ~~
voltageconstant: .0093
Kt: .0125 (oz-In/I)
rpm: 52346.8320
powerin: 888.0 watts
powerout: 780.1480 watts
HP: 1.0457
efficiency: 87.00%
torque: 19.20 oz-in

~~ [22.2 volts, 50 amps] ~~
voltageconstant: .0093
Kt: .0125 (oz-In/I)
rpm: 52213.4400
powerin: 1110.0 watts
powerout: 997.3600 watts
HP: 1.3369
efficiency: 89.00%
torque: 24.96 oz-in

~~ [22.2 volts, 60 amps] ~~
voltageconstant: .0093
Kt: .0125 (oz-In/I)
rpm: 52080.0480
powerin: 1332.0 watts
powerout: 1213.4520 watts
HP: 1.6266
efficiency: 91.00%
torque: 30.72 oz-in

~~ [22.2 volts, 70 amps] ~~
voltageconstant: .0093
Kt: .0125 (oz-In/I)
rpm: 51946.6560
powerin: 1554.0 watts
powerout: 1428.4240 watts
HP: 1.9147
efficiency: 91.00%
torque: 36.48 oz-in

~~ [22.2 volts, 80 amps] ~~
voltageconstant: .0093
Kt: .0125 (oz-In/I)
rpm: 51813.2640
powerin: 1776.0 watts
powerout: 1642.2760 watts
HP: 2.2014
efficiency: 92.00%
torque: 42.24 oz-in

~~ [22.2 volts, 90 amps] ~~
voltageconstant: .0093
Kt: .0125 (oz-In/I)
rpm: 51679.8720
powerin: 1998.0 watts
powerout: 1855.0080 watts
HP: 2.4866
efficiency: 92.00%
torque: 48.00 oz-in

~~ [22.2 volts, 100 amps] ~~
voltageconstant: .0093
Kt: .0125 (oz-In/I)
rpm: 51546.4800
powerin: 2220.0 watts
powerout: 2066.6200 watts
HP: 2.7702
efficiency: 93.00%
torque: 53.76 oz-in

Plett HP 220/40/A2 @ 22.2v
~~ [22.2 volts, 30 amps] ~~
voltageconstant: .0101
Kt: .0135 (oz-In/I)
rpm: 47567.2500
powerin: 666.0 watts
powerout: 625.5517 watts
HP: .8385
efficiency: 93.00%
torque: 17.28 oz-in

~~ [22.2 volts, 40 amps] ~~
voltageconstant: .0101
Kt: .0135 (oz-In/I)
rpm: 47239.2000
powerin: 888.0 watts
powerout: 837.2376 watts
HP: 1.1223
efficiency: 94.00%
torque: 23.04 oz-in

~~ [22.2 volts, 50 amps] ~~
voltageconstant: .0101
Kt: .0135 (oz-In/I)
rpm: 46911.1500
powerin: 1110.0 watts
powerout: 1045.9234 watts
HP: 1.4020
efficiency: 94.00%
torque: 28.80 oz-in

~~ [22.2 volts, 60 amps] ~~
voltageconstant: .0101
Kt: .0135 (oz-In/I)
rpm: 46583.1000
powerin: 1332.0 watts
powerout: 1251.6093 watts
HP: 1.6777
efficiency: 93.00%
torque: 34.56 oz-in

~~ [22.2 volts, 70 amps] ~~
voltageconstant: .0101
Kt: .0135 (oz-In/I)
rpm: 46255.0500
powerin: 1554.0 watts
powerout: 1454.2951 watts
HP: 1.9494
efficiency: 93.00%
torque: 42.24 oz-in

~~ [22.2 volts, 80 amps] ~~
voltageconstant: .0101
Kt: .0135 (oz-In/I)
rpm: 45927.0000
powerin: 1776.0 watts
powerout: 1653.9810 watts
HP: 2.2171
efficiency: 93.00%
torque: 48.00 oz-in

~~ [22.2 volts, 90 amps] ~~
voltageconstant: .0101
Kt: .0135 (oz-In/I)
rpm: 45598.9500
powerin: 1998.0 watts
powerout: 1850.6668 watts
HP: 2.4807
efficiency: 92.00%
torque: 53.76 oz-in

~~ [22.2 volts, 100 amps] ~~
voltageconstant: .0101
Kt: .0135 (oz-In/I)
rpm: 45270.9000
powerin: 2220.0 watts
powerout: 2044.3527 watts
HP: 2.7404
efficiency: 92.00%
torque: 59.52 oz-in

Great info!!

How did you calculated it?

What numbers are exactly used?

Quote:

Originally posted by Serum
Great info!!

How did you calculated it?

What numbers are exactly used?

I wrote a "program" (if you will) whereby I can enter the voltage constant, no load current, internal resistance, and desired voltage (it also has an amp iterator which I arbitrarily started at 30I and ended at 100I).

I've checked the specs on the main players in r/c brushless (hacker, lehner, plett., etc.) and verified the aforementioned values and plugged them into my "calculator." You can find a grid w/ those values of the motors I listed (and many many many more) at the following link -> (http://www.motocalc.com/data/motor.html).

Interestingly you won't find the same values for Lehner motors. :( I'll hopefully be calculating at least the 2400XL in the very near future. Kinda funny that I've spent so much time looking into various motors but will end up purchasing a brand that seems to have an excellent name recognition for quality. Go figure.

Anywho, its really simple, just collect the motor constants for a given motor (see the link above) and complete the formula's on which you'd like more information.

For the most part all the information you need is out there (the web and search engines are the best thing ever)...well to at least make an educated decision. Including formula's for mass, velocity, and the like.

I've not played w/ my calculator in a while (I want to expand on it) due to work (being so darn busy)...like I am tonight posting on the forums. ;) With regards to expansion I want to integrate a gearing calc and mass/velocity calc into this to help find the elusive sweet spot.

Its geeky fun.

Nice!!

How did you get the unloaded rpm/v range of the plettenberg if i may ask?

It would be nice to have a convertor, that allows you to type the mass, gearing ratio and the motor information based on your calculator, among with the amount of power available, to see what the load of the controller would be like.

I don't exactly know what you mean, is it the information you need on the lehner motors or is the calculator showing different numbers?

here is the link to the lehner motors but i am sure you allready found it.

Are you willing to share the program with us? Sounds very interesting!

It would be nice for you to have an eagletree car data recorder to compare the practice with the theory..

Quote:

Originally posted by Serum
Nice!!

How did you get the unloaded rpm/v range of the plettenberg if i may ask?

It would be nice to have a convertor, that allows you to type the mass, gearing ratio and the motor information based on your calculator, among with the amount of power available, to see what the load of the controller would be like.

I don't exactly know what you mean, is it the information you need on the lehner motors or is the calculator showing different numbers?

here is the link to the lehner motors but i am sure you allready found it.

Are you willing to share the program with us? Sounds very interesting!

It would be nice for you to have an eagletree car data recorder to compare the practice with the theory..

Schnikes!

I forgot you linked that for me earlier. :-)

Maybe you can help me w/ the translation?

From the "grafik" ;)
http://www.lehner-motoren.de/diagram...13v/grafik.gif

U=voltage
I= amps
N=RPM?
M=Time or distance?
W=Efficiency

Raw numbers
http://www.lehner-motoren.de/diagram....13v/liste.txt

I believe the headers are;

"Spann. Volt" = "Volts In"
"Strom Amp." = "Amps Drawn"
"PEing. Watt" = "Watts In (Power In)"
"Drehz. U/Min." = "RPM's"
"Moment Ncm" = Not sure about this one
"PAusg. Watt" = "Watts Out (Power Out)"
"Wirk. %" "Efficiency=Power In/Power Out"

The raw numbers and the charts are basically what I would be able to plot w/ my calculator, provided I have the correct information. It appears that Lehner will provide the result of the formulas but not the data within them. I supposed I can solve for the missing variables w/ the data given.

Quote:

Originally posted by Serum
Nice!!

How did you get the unloaded rpm/v range of the plettenberg if i may ask?

. . .

Ah, I almost forgot to answer this.

Check my linky (http://www.motocalc.com/data/motor.html). Scroll down, you'll find the Plettenberg information you so desire. ;)

Quote:

Originally posted by Serum
Great info!!

How did you calculated it?

What numbers are exactly used?

I'm tired... been up for 40+ hours.

The link that I gave has the source data. The formulas which utilize that source data are pretty easy to find on google.

This link has a fairly decent first read on the subject -> http://www.slewin.clara.net/elec/tmotor.htm

okay, Thanks!

I will dive in to it later this evening, i am working on our kitchen for our new house...

The n/cm value is newton/cm (torque)

Rough numbers;

100 oz/inch = 7112 gram/cm = 71ncm

Quote:

Hey, did you get your LiPo's? Huh? Did ya? Did ya? :D

btw, what voltage are you going to run? ...guess that'll answer my question about whether you're going serial or parallel.

I'll have the lipo packs in about 4 hours; I'm picking them up today.

With my current controller issue (9918 losing brakes) I won't be able to test them in my buggy, but I do plan on putting one in my XXX-T MF with the MGM 12012 and xl5000 to see what 11.1v will do to it :)

In my 1/8th buggy I'll be running the two 3s 3200 packs in parallel for 11.1v and 6400 mah to get through 15-minute races.
Once I get a solution from Mike regarding my 9918, I'll get the lipo packs into the buggy and get some results.