XT8 Update
 

Ok, so I've been slowly working on my XT8 conversion and thought I would post some of the latest pics. Now that I've got my battery "tray" installed I'm just waiting for the Monster Max esc and I'm done. Check out the pics and let me know what you guys think! :yes:

http://i189.photobucket.com/albums/z...8/Xt8Front.jpg

http://i189.photobucket.com/albums/z...T8/XT8Rear.jpg

http://i189.photobucket.com/albums/z...assisTop01.jpg

http://i189.photobucket.com/albums/z...assisTop02.jpg

http://i189.photobucket.com/albums/z...atteryPost.jpg

http://i189.photobucket.com/albums/z...hassisRear.jpg

http://i189.photobucket.com/albums/z.../MotorSide.jpg

http://i189.photobucket.com/albums/z.../MotorRear.jpg

The word 'tidy' comes to mind. Great job dude.

Looks good, gotta love the X-rays.

Couple q's: Is that deflector in front of everything something you came up with (I like it)? And, what keeps the lipo from sliding out the side of you batt holder?

I definitely like it. I'd like to learn more about the dirt guard as well. Looks useful.

great work, i like your battery tray

Thanks for the kind words guys!

About the mud guard, yes it is something I came up with. Basically it's a solid piece of plastic that is held on by the two front bolts on the side mud guards. It sandwiches between them. Then there are velcro strips to form it to the side mud guards. The plastic has a small slit going up to the servo arm so it can slide down as one large piece.

On the battery tray, I attached the battery to the CF with some very heavy duty double sided tape. The battery is then held down by a couple 1/4" aluminum posts that I threaded to accept a 8/32 counter sunk screw from the bottom of the chassis. It seems extremely stout. As you'll notice, the bottom CF strip is not covering the whole battery in order to drop the COG as much as possible. With 1/8" CF, the battery rests almost perfectly flush to the mud guard. Then I have a piece of the fuzzy part of velcro on the bottom of the CF for cushioning.

Here are a few more "detailed" shots that might help my explanations:

http://i189.photobucket.com/albums/z...ostClose01.jpg

http://i189.photobucket.com/albums/z...BatteryOut.jpg

http://i189.photobucket.com/albums/z...BatteryTop.jpg

http://i189.photobucket.com/albums/z...teryBottom.jpg

Interesting motor choice (1515/2Y/F/H -> 1100kv) especially considering you are waiting for a 6s capable ESC (MMM). I run my 1515/2y (smooth can) with 10s1p A123 (comparable to 8s lipo) and it reaches around 30000rpm under load (eagletree) with Badlands on gras with a 1:13 gearing. With lighter racing tires i see around 32000rpm. Now if you run it with 6s max you will shoot for 25000rpm. No doubt this also can be geared to 35-40mph. Should make it very driveable as you have to gear it very low to reach speed.

Battery pack seems to be a 6s pack, right? judging by it's dimension you will have some good runtimes.

All in all a perfect racing setup (low RPM turning motor, thus not as agressive as high rpm revving motors. With its attached fan and relative low voltage the motor should run ultra cool. I wouldn't expect high Amp peaks too, so the ESC will have no hard time and will run cool too. All this will result in low mAh consumption, giving you long runtimes.)

With your front protection, sideguards in combination with your body chances are low that stones are sucked into the fan of the motor.

Thumbs up. I like it.

Looks really awesome, great work!!

I like the look of those 'H' motors, got one on the way myself. Do you think you could post some more detailed pics of the endbell fan looking 'into' the motor?

thanks
jordan

Nice one! Makes me wanna post some pics of my "updated" XT8
http://www.rc-monster.com/forum/showthread.php?t=7993
It came a long way since then, lots of mileage, lots of tweaks...

Thanks othello! You've basically just stated all the reasons for my setup to a "T" :intello: The battery is indeed a 6s made by NeuEnergy and it's a 3900mah. Going with the low kv motor was done for the exact reasons you stated - longer run times and cool temps for racing. I plan on running it with a 15t pinion for starters and then adjusting from there if needed. My calculations tell me that the 15t pinion setup will be slightly faster than my previous brushless CRT so that's perfect.

I will also be attaching a small air filter at the rear end of the motor to eliminate any dust getting into the motor. I'll keep you all posted on that.

Thanks jordan! I'll see what I can do - the best photo I have so far of the end bell is the one already posted. Maybe I can get a better shot of it for you tonight. If I remember :lol:

Thanks Daf - dude, I gotta tell ya, yours was one of the sweetest conversions I've ever seen and helped me think through a lot of what I was trying to do for mine. Thanks for leading the way!

And you definitely need to update your thread with pics if you have them - I would love to see the latest.

Here's the best I can do for you:

http://i189.photobucket.com/albums/z.../EndBell02.jpg

http://i189.photobucket.com/albums/z.../EndBell01.jpg

Now Sower, come on! It only takes 4 screws to get the centerdiff/motor assembly off...

just kidding mate! :lol: But your "here's the best I can do for you" made me smile.

Nice motor though.

And yeah, I hear you, next time my truck is clean I'll snap some new pics.


Daf

Dude, you're hilarious - and you're actually right. I should have just pulled the dang motor out!! :lol: Oh well, I was heading off to work this morning and my car was running in the driveway :mdr:

I'll try to remember next time!

That looks nice. Have you added some type of foam to the back so it won't suck up any rocks?

Not yet, but it's in the works! :mdr:

Sucking up rocks? Man, you got something mixed up there :lol:

Most motors with fans in them will act like a vacuum and it will suck debris isnide them if the holes aren't covered. Might even get the rocks you are thinking about too :lol:.

Well, depends on the neighborhood :rofl:

thanks for the pics sower, appreciate all the 'effort' you put into them :lol:

hmm... i thought the endbell would be sealed and the fan over it. Keep us updated on the filter you're going to make for it, as im probably going to have to rip off your design :whistle: :wink:

thanks again
jordan

That’s absolutely beautiful!

Stupid question here; how you do tell which Neu motors include the end-bell fan? Is it obvious via the part-number or is this an accessory item for all 15 size motors?

The Neu's with fans have an 'H' on the end. They are actually supposed to be used as heli motors. If you go to CC and build a 15xx Neu, you'll see a heli version option, that includes the fan.

Check this out: http://www.neumotors.com/20061222/HeliMotors.html

Ok guys, here's the latest. I agonized over it, but after 3 hours of wrenching, I finally pulled the two motor screws out so I could get a better pic of the endbell.

I also have a shot of the new "air filter". Basically a cut out piece of felt. Hope you enjoy!

http://i189.photobucket.com/albums/z...8/IMG_3389.jpg

http://i189.photobucket.com/albums/z...8/IMG_3392.jpg

That is what I'm talking about. That looks awesome.

Thanx for your big effort. I wonder why they covered a big part of the air intake holes with this "white shield". Doesn't make sense for me as it hinders air to get inside and will make the fan loud: not very efficient.

Did you make a testrun to check airflow with and without filter? Since you will run your motor with low rpms, airflow too will not be very high.

Thanks guys - by the way, you know I'm joking about my "effort", right? Took me about 2 minutes to pull the motor out. :mdr:

Anyway, I haven't done any testing on this motor yet since I'm waiting for the MM to come out over the next week or two. But since it's such a low KV motor that will be running on 6s, I don't think it will have any trouble. My last Neu setup never got much hotter than 120 so this one should stay at 100 or lower. We'll see.

And that shield you see inside is actually metal and spins with the shaft - for what it's worth.

You should be fine. It's better to restrict the air just a little then to have a pebble ruin the motor. I really don't think much air will be restricted and if that was the case most of the Nitro or our one IC engines wouldn't run at all.

Air filter on an electric motor now:intello:
Just like on a nitro:lol:

Good job!

I know - pretty funny, eh? :lol:

MMM Platform
 

Ok, I've got my MMM coming today so last night I had to build a platform for it. I decided to mount it over the steering servo and make the platform out of the left over CF from making my battery "tray". I think it turned out pretty nice - check it out:

http://i189.photobucket.com/albums/z...PLatform02.jpg

http://i189.photobucket.com/albums/z...Platform01.jpg

http://i189.photobucket.com/albums/z...Platform03.jpg

Battle Tested - Results
 

Well I've given the XT8 the full shakedown at the track so I thought I would post some pictures (dirt and all :lol:) as well as the data collected from the testing. Basically it looks like I'm getting 25 minutes of run time in racing conditions if the track isn't watered down. Haven't tested it yet in the high traction but I'll let you all know. Temps at the end of the run were 100 degrees for the motor, 95 for the battery, and 110 for the ESC. I know . . . the ESC temp is tough to really guage in that Fort Knoxx casing, but that was the best I could get. Ambient temps weren't too hot though - right under 80. Here's some photos:

http://i189.photobucket.com/albums/z...8/IMG_3592.jpg

http://i189.photobucket.com/albums/z...8/IMG_3594.jpg

http://i189.photobucket.com/albums/z...8/IMG_3595.jpg

http://i189.photobucket.com/albums/z...8/IMG_3597.jpg

Thats pretty decent results.

I've wondered about temping the MMM too, guess you can just about see the fins through the slots in the case.

Where do i get a Neu with that fan endbell, straight from Neu or what? And i don't mean to get off subject, but can i get some pics of that red Ferrari above your workbench:mdr:?

I got mine from Diversity Model Aircraft @ flydma.com. It is technically a heli motor when it has that endbell fan configuration and Mike doesn't carry them. I'm sure you can contact Neu for one also.

Ah, the TT-01 Ferrari - my son would be stoked you're asking about it. He loves that thing. I'll see if I have any other pictures of it although I don't think I have any here at work. :oops:

Amain sell the fan versions too however they are more recommended for Helicopters. Risk is obviously getting debris and dirt in the motor on a car.

Normal objective is to seal the motor rather than blow stuff into it.

That's an awesome quote there! :lol: On that note, my "air filter" is working excellent. Just a piece of felt cut to fit as shown in some of the past photos seems to do the trick. Not sure anyone really needs to run the heli motor though. A properly setup system shouldn't need it.

Outstanding job Sower!... :party:
Great conversation you've got there.. I was wondering if you knew the answer to the following question.

Can I convert my XB8 buggy to this XT8 Truggy by simply incorporating the lower and upper arms and swapping out the drive axels??

Or is the chassis to short / not wide enough, etc, etc just bite the bullet and get one??

Thanks for your time and great build.. :yes:

Shaun.

Thanks Shaun! I'm thrilled with it so far. In fact this last weekend I raced it in a 15 minute main and it performed excellent. There were a lot of people interested when I finished in 2nd place. :yes:

As far as a conversion, I don't think it's doable. Here's a link to the specs on the XB8:

http://www.teamxray.com/teamxray/pro...ria=0&catName=

And here's the specs on the XT8:

http://www.teamxray.com/teamxray/pro...w%20XRAY%20XT8

Hope that helps.