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-   -   Brushless hpi baja rc-monster (https://www.rc-monster.com/forum/showthread.php?t=20189)

FG101C 06.19.2010 11:55 AM

This thread is going to make me spend more money I shouldn't spend. My 1:1 car is freshly paid off though, :whistle:

RC-Monster Mike 06.19.2010 12:06 PM

Quote:

Originally Posted by Andrewg (Post 370425)
Mike

Have you logged your car?

Have a think about this. At the 91% level of efficiency (most Neu 1500s and up will reach this when in the right voltage and load combination) how much change in efficiency will produce a 25% difference in heating?

Yes, I have logged my Baja on 7s and 8s with multiple gear ratios. 8s with the 12t pinion is my favorite, and this setup yields upwards of 170 amp burst rates. I have logged upwards of 4000 watts peak power output with the 12t pinion, too.
It is true that a Neu or Lehner motor in ideal circumstances may reach 90% efficiency, but this would be in very specific circumstances that will not happen very frequently if at all, and not for sustained periods in typical rc car use. Consider that the motor would need to be in ideal circusmtances, as well as the ESC, batterries, etc. - there is resistance in everything along the way(the gear mesh will cost 1-2% efficiency in power - even more in the tranny itself, the battery connections, wire, ESC, etc. all have resistence that makes achieving 90% efficiency extremely unlikely in the real world)Actual efficiency will likely be very significantly lower. Regarding heat - even if you use 90% efficiency as the baseline, dropping to 80% efficiency(still somewhat unrealistic throughout the run) would double the heat generated(so a 10% efficiency reduction would yield 100% more heat). It is very significant.

The Cow 06.19.2010 08:20 PM

Excellent looking kit Mike! :mdr: This thread has me thinking it may be time to ditch that little 1/8 scale toy I thought was a big RC...

Heath

speedy 06.20.2010 06:59 AM

What's you baja 5b bl-setup ?

would a cc-hydra 249A HV esc and a neu 2230 motor on 8-10s be good ?

suicideneil 06.20.2010 01:12 PM

^There are 22 pages of discussion & suggested setups & recommendations, especially in the last couple of pages or so- happy reading :smile:

thomatrix 06.21.2010 05:20 PM

Any new vids or build pics?

I am still waiting for my two kits to arrive here in Denmark...

nitrostarter 06.21.2010 06:25 PM

Quote:

Originally Posted by thomatrix (Post 370723)
Any new vids or build pics?

I am still waiting for my two kits to arrive here in Denmark...


Gotta love that international shipping...:whistle:

thomatrix 06.22.2010 04:16 PM

Kits finally arrived
 
4 Attachment(s)
The (first) wait is over. I finally got the kits and mounted the first one. I only had little time to do this so I am by no means done. Still missing the batteries (10S config) which unfortunately are out of stock.

Anyway - for this test setup I have the Turnigy ESC, the Castle BEC, 10S batteries, 2215 Neu 750kv, pistix and 13T pinion which will give me a speed of around 64km/h (40mph). This is a test setup and I bought this fairly cheap ESC to test how it works while I wait for the Castle ICE ESC for cars (should be able to handle 12S/160A according to Patrick from Castle).

I am also going to build yet another Baja where I will test a Neu 2230 and a Lehner 3060 but only when the new Castle ESC is out.

Excellent kit btw Mike - mounting it was a pleasant experience. Great fitting and workmanship!

HotnCold 06.22.2010 10:10 PM

Quote:

Originally Posted by thomatrix (Post 370723)
Any new vids or build pics?

We got some video this weekend - I will speak to mike about posting some of them - Absolutely awesome power - watching this thing power wheelie @ will - just crazy..

Ryu James 06.24.2010 07:36 PM

Quote:

Originally Posted by thomatrix (Post 370462)
I just ordered one too. I know it may be going over board but I have a 2215 and ordered a 2230 + a Lehner 3060 to try out on two bajas.

Excellent thread here btw! Thanks of all the pics and info. Much appreciated.

where are you buying your motors from? particularly where did you buy your lehner?

reno911 06.24.2010 08:02 PM

Just got through this whole thread and all I have to say is WOW.

Oh and it is about time I get to see that freaking monster of an esc put into a car. Ever since it came out on hobbycity I have been wanting to see it in action.

Ryu James 06.25.2010 01:13 AM

Quote:

Originally Posted by Electric Eel (Post 369627)
Here are some more pictures. And to my wife, the whole batch, batteries and all came to under $50. So don't be mad.

hahaha! if that aint the truth! my wife believes that a custom RTR brushless 1/8 or 1/5 costs roughly $150 to $200 to build. Its a good thing this RC hobby isnt very expensive. :wink:

Jahay 06.25.2010 05:30 AM

You have one ballistic baja there mate!
Mikes kit look top notch too!!! Nice1 Mike!

I am currently looking for an ESC (waiting on the MMMXL if thats what they are calling it) But after seeing this turnigy ESC, i am in too minds.

how much did it set you back?
how programmable is it?
Does it allow brakes and reverse or are you using mech brakes?
What are the specs as i just want to use 9s with my neu 1520.

Could you advise? i dont mean to steal your thread, its just i am quite surpriised i have never seen this before!

killajb 06.25.2010 02:22 PM

http://www.hobbycity.com/hobbyking/s...dProduct=10332

Arct1k 06.25.2010 02:38 PM

Ha! I left my pc on the hobby city page for a while and got this pop up after 5mins...

Hello shopper!
We noticed you've been looking at this product for a while and we would like to offer you a discount. If you click on the add to cart button below we can offer you this product for $179.99.
This offer will only show once.
If you leave this page or close this window you will not see this offer again.

$179.99

brian015 06.25.2010 05:18 PM

I get that price when I log in with my password.

speedy 06.25.2010 05:54 PM

were can i buy a pistix device?

brian015 06.25.2010 06:10 PM

Normally here:

OSE pistix

but they're out of stock now.

suicideneil 06.25.2010 07:27 PM

^ This is why stick radios > pistol radios, everytime... :whistle:

Jahay 06.26.2010 04:54 AM

ooo... that esc although impressive specs, has some dodgy reviews... It looks like it cant take a battering if it keeps falling apart...
No Where near as good with the programming compared to castle. But i am considering it for the price

what exactly is that pistix device?

_paralyzed_ 06.26.2010 06:45 AM

Quote:

Originally Posted by Jahay (Post 371377)

what exactly is that pistix device?

air transmitters (stick radios) and land transmitters (pistol grip radios) use a different pulse width to communicate with speed controls (esc).

The pistix device goes in between your reciever and esc so you can use an air based esc with a land based pistol grip radio.

Jahay 06.26.2010 09:13 AM

ah huh... thanks for the explanation, i didnt know that...

Electric Eel 06.26.2010 11:54 AM

4 Attachment(s)
Getting closer to the finish line. Added the wheelie bar and one piece rear hubs. The spur gear is a DDM Hardened Black Magic 58T. The pinion is one of Mike's excellent mod 1.5, 8mm bore-14T.
Getting closer to needing the MMM XL.

thomatrix 06.27.2010 03:05 AM

Looking mighty good EE!

I only lack the batteries and I'm good to go...

thomatrix 06.27.2010 03:11 AM

Quote:

Originally Posted by Ryu James (Post 371221)
where are you buying your motors from? particularly where did you buy your lehner?

I buy them straight from the manufacturer:
http://www.lehner-motoren.com/

thomatrix 06.29.2010 05:12 PM

Neu 2230 motor will not fit
 
I just received my 2230 from Offshoreelectrics to find out that the measurements given was not correct and that the motor will not fit the car.

Here are the specs
- Given measurements:From this chart on Offshoreelectrics website the length of the 2230 1.5Y is 4.7 inches
http://www.offshoreelectrics.com/neu-motor-chart.htm

- The car with the kit mounted has exactly 4.975 inches of space for a motor. This should leave enough space based on the above mentioned chart...

- The motor that i received is 5.491 inches long :( This includes the little peace of the shaft sticking out the rear of the motor.

Any ideas where I went wrong here?? Should be pretty straight forward.

thomatrix 07.04.2010 05:16 AM

Still waiting for batteries here. They were ordered a few weeks ago but is still out of stuck :(

Anyway - did any of you get to test this kit with a bit of driving. Any vids and pics shared will be much appreciated. I will of course do the same when I get mine rolling...

Electric Eel 07.05.2010 02:25 PM

3 Attachment(s)
I finally finished it and will drive it this weekend. Decided to go with the Ice HV 160. Here's a comparison with my Savage Flux.

thomatrix 07.06.2010 01:02 AM

I actually thought about buying that ESC too but somehow I know I'd be disappointed if Castle put out the car version the day after I bought it so I opted to wait a little more.

Two questions:
1. Did you make a flat spot on the motor shaft to get a better grip when mounting the pinion?
2. Do you plan on dust protecting the Neu motor? If you drive off-road you may very well get a stone or gravel into the large gap in the motor.

The car looks very nice and I hope you will post some vids when you get it out!

nuz69 07.06.2010 04:51 AM

According to neu motors, the 2230 series is 4,7 inch long too... And its the longest motor they have :lol: Maybe you get a prototype of 2235 ? :lol::lol:

thomatrix 07.06.2010 06:15 AM

Maybe - but I'm not laughing. Will have to modify stuff to make it work. Will make it happen though...

nuz69 07.06.2010 06:40 AM

At thoses motor price levels, you have maybe to contact offshoreelectrics and neumotors support to have a proper explanation about this extra sized motor....

Electric Eel 07.06.2010 11:35 AM

Thom, I did grind a small flat spot on the shaft. For dust protection I'll wire tie one of these Outerwear filters to the rear of the motor. http://www.outerwears.com/proddetail...9290&cat=12439

The Outerwears mesh lets air flow but really keeps the junk out. I've used them on a lot of motors and they work well.
Sorry to hear about the 2230 size problem. I've sent Steve Neu a few e-mails asking him to update the 22XX sizes on his page, but nothing yet.

kazuaki 07.06.2010 11:39 AM

Electric Eel,
What size motor are you running?

thomatrix 07.06.2010 12:23 PM

Quote:

Originally Posted by kazuaki (Post 372384)
electric eel,
what size motor are you running?

2220 :)

thomatrix 07.06.2010 12:24 PM

Quote:

Originally Posted by nuz69 (Post 372356)
At thoses motor price levels, you have maybe to contact offshoreelectrics and neumotors support to have a proper explanation about this extra sized motor....

I may give them a call and ask. It is a problem that sizes are not accurate.

thomatrix 07.06.2010 12:27 PM

Quote:

Originally Posted by Electric Eel (Post 372383)
Thom, I did grind a small flat spot on the shaft. For dust protection I'll wire tie one of these Outerwear filters to the rear of the motor. http://www.outerwears.com/proddetail...9290&cat=12439

The Outerwears mesh lets air flow but really keeps the junk out. I've used them on a lot of motors and they work well.
Sorry to hear about the 2230 size problem. I've sent Steve Neu a few e-mails asking him to update the 22XX sizes on his page, but nothing yet.

Did you do it with a Dremel? I am worried about getting it even. If you could post a close up pic of it that would be great!

As for the Outerwears that is a great idea. I did have a look at their Electric motor prefilters but they are far too small for the larger Neu and Lehner motors.

Let me know if you get an answer from Steven Neu on the size btw. Does your 2220 length match those from the chart?

thomatrix 07.08.2010 02:38 AM

My motors
 
4 Attachment(s)
Here is the motors I'll be testing. Still waiting for batteries so no telling how long I have to wait until I get to try them out.

kazuaki 07.08.2010 03:16 AM

Quote:

Originally Posted by thomatrix (Post 372549)
Here is the motors I'll be testing. Still waiting for batteries so no telling how long I have to wait until I get to try them out.

Have you figured out a way to fit the 2230?

thomatrix 07.08.2010 04:03 AM

1 Attachment(s)
Quote:

Originally Posted by kazuaki (Post 372553)
Have you figured out a way to fit the 2230?

Only way I can see is to dremel away some of the area highlighted in the attached picture. If anyone has another approach please let me know!


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