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Extended CRT.5 - MetalMan Style
Last night I started work on extending my CRT.5, after finally getting a sheet of 1/8" thick 6061-T6. The extension is a standard 1.5" over stock, to use stock center-rear dogbone in the front. The chassis also has the motor/diff offset 1/4" from center to the right side, and the chassis is 1/2" wider than stock (to let the battery have more room to lay down).
Servo will be an Airtronics 359, battery is a 3s 4000mah 20C, and I hope to throw a Neu 1509/1Y smooth can into it (but 9L to start). The chassis took 4 hours to make, but still needs servo mounts, battery mount, chassis cutouts (to reduce weight), and chassis bracing. I'm looking at making a battery holder based off of Serum's recently posted design. |
Sounds very cool. But you give us this info without any pics...?!?! :smile:
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Sound cools. I'm also interested in Serum's battery design. I think if there was some sort of system on the truck with a few plugs, and then a housing to which the battery gets secured and plugged into. Then the housing itself can be attached to the module on the truck, and secured via a body pin.
This way, you can have say, 2 or 3 housings per truck (and then just switch out batteries within the housing, if you need to). This way you only need a few housings, and not one housing per battery. I look forward to seeing it in person. :yes: |
There's nothing too spectacular yet, but here are pics of the chassis:
http://img.photobucket.com/albums/v1...o/IMG_6702.jpg http://img.photobucket.com/albums/v1...o/IMG_6705.jpg http://img.photobucket.com/albums/v1...o/IMG_6708.jpg You can see stock braces, but those will go away when I figure out what exactly I am going to do for bracing. So far I'm thinking of a single full-length chassis brace that will connect at the current rear chassis brace position, and will be secured to the chassis where the stock rear brace mounts, at the middle of the chassis, and at the front. |
You could make the braces look like the bomp proof truck, mini style.
Sounds like a good idea to tie the front and rear bulks to the center bulk. It will make it stronger up and down as well as torsionally. Thinking about something like this for my mbx conversion to an on road car, like the ultra gtp. |
Its looking good MM
Did you get your plate from onlinemetals.com? A 7075 plate would only cost a little more and you wouldn't need chassis braces. |
My inspiration for the chassis brace actually came from BPP, from a couple years ago. This will be the first time I will try it, though.
The plate was originally 1/8" x 6" x 48", and I got it through Speedy Metals on Ebay for $20 shipped. I've gone with Speedy Metals and this same deal for a couple years now, and for the price, have been very pleased. |
I too have used speedy metals with great results. I also need to pick up some more 6061 1/8 for my aftershock conversion.
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must have been a pain to machine! what did you used to cut it?
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Scroll saw, and drilled with drill press. The cutting is slow, and not as precise as I would like, but it gets the job done pretty well (as you can see). This is the same way I make all of my parts.
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Looks goos so far :smile:. Did you put kick up in (bend up) the FR ?. You could also make two short braces & connect them to the center diff mount from the FR top plate & the RR bulk area to stiffen up your chassis, but remember some flex in these cars is good. It is possible to make the car to stiff.
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The front has kickup, that matches the stock chassis. It is actually looking like I will have to make at least two braces to brace the truck well, as a single full-length brace wouldn't fit properly and would require too much work to make possible.
I managed to finish the servo mount, and I must say, I haven't seen anything like it before :yes:. |
This truck is getting close to finished. Servo's mounted up, the chassis brace is completed and mounted (although I need to shorten the screws on it), the battery tray is done and just needs to be mounted, and all the electronics are mounted.
Unfortunately this battery tray was not designed with the same style as Serum's quick-release tray. That would have taken too much time/effort for me at the moment to design/cut, so I went with a design I've used before: http://img.photobucket.com/albums/v1...o/IMG_5562.jpg This one is better thought out and more sturdy, not to mention better looking, and it will mount directly to the chassis by 4 screws. Velcro will still hold the battery in from the top. The front of the battery holder has a bent "arm" to keep the battery from sliding forward, and there will be a velcro strap in front of that to keep the "arm" from breaking. The chassis brace is a two-piece design, with a 1/4" thick polycarbonate rear brace, and an 1/8" thick 6061 aluminum 3-point brace. The aluminum brace attaches behind the center diff to the rear brace, in front of the center diff to the chassis via aluminum angle, and below the front top plate via aluminum angle. The polycarb rear brace allows the chassis some flex, but overall the chassis has virtually zero chance for flexing. Pics would be up, but I'm at school and won't be home for a few hours. |
Looks good - but where's your Neu?
I look forward to seeing it in person tomorrow. :mdr: |
Dang! Thats sweet! Chassis looks awesome!!!!!
Is that the stock wing? And whats the specs on that batt? |
Yea, its a stock wing. I'm not sure about the battery...seems to be his 4S impulse one...
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Nice, 4s!!! Rocket!:na: |
Yea the FlightPower 3700's are smaller than I thought...much smaller. (my Evo30 4500's are LONG though)...
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Yeah
And the wing looks not too bad with that body..... Is anyone using a bigger wing? IMO the stock one is too small really..... IDK, im weird I guess.... |
Yes. you are weird. :lol:
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The battery is a 3s 4000mah 20C, about the same size as a 6cell NiMh battery, just longer.
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I'm looking forward to showing the .5 to you in person :yes:. |
Kind of random
But the crt looks just like your MT2 in the 2nd pic lol..... What center diff fluid are you running MM? |
Right now it's 5k in the center. The nitro guys are using 2k and are still wheely-ing, I just went thicker because these motors have more torque than nitro engines :yes:.
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I wanna see it too! I really haven't paid attention to the CRT .5 conversions so far, but this one really does look great.
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You'll get your chance (hopefully sooner rather than later). We should do a whole new "SoCal bash" in Saugus/Santa Clarita, with track bashing and rock crawling.
Took the .5 to the track today, along with BP_Revo and his .5 and mwry13 with his Kyosho 7.5. The CRT .5 did very well, except the suspension is still a bit soft. Surprisingly the Step Pins hooked up excellently. I didn't have any problems with the truck, aside from losing body pins... But I fixed that. And nothing broke, although I did manage to lose a flange pipe and lower screw that hold the bottom of the knuckle to the front c-hub. |
How much running did you get in after I left? Did the screw hold in very well without the kingpin spacer (flange pipe, whatever).
I'll have to re-solder that plug of mine that popped out. Hardest part should be clearing the bullet connector of all the wire before I put new wire in, but otherwise it'll take longer to heat the soldering iron if anything... I'll also better mount my battery tray and add another layer of foam padding so I stop messing up my batteries... |
I dumped the batt that I had, and the screw held without any issues (thanks again for the screw!). Then I went through a WHOLE pack on the Hyper 8 - the buggy tired me out after 20mins of straight driving.
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No problem - thanks for the M3 nuts! (and letting me use your castle link)
Yea I didn't actually sit there and run through a full pack at any time. (I actually haven't ever done that with a lipo). Its just too much driving. 40 minutes of runtime with my G2R when it had the MA 8K's and the 6.5...took me like 3 sessions to dump one of those packs...but at least I knew I could run a hell of an enduro race lol... YGPM btw. |
Travis; A phonecall for your; one devistated, yet indignant M3 nut, he likes to know who the F put him there..
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Anything new MM?
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I broke the upper and lower right front arms on Saturday after work when I clipped a wall going ~20mph (trying to get around parking blocks quickly, but wasn't paying enough attention). Other than that, it's been running great so no need for any improvements :yes:.
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Cool!
Any more pics? |
Nothing has changed since the pics in post #14 on the first page of this thread. Are there any specific angles or views of something in particular that you would like me to take?
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More pics of it with the body on would be sweet:mdr:
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MetalMan,
I was thinking of getting one of those Tekno battery boxes for my CRT.5 (RCM ext chassis), but it looks like it sticks out a lot over the edge of the chassis? Does this cause any problems with the body? Does anyone know if the RCM battery box is narrower than the Tekno? Oops, my bad this was supposed to go on ssspconcepts crt.5 post. I'm looking at too many posts at one time. Of course if anyone has an answer to my question it would be appreciated. |
Laying the battery flat on a CRT.5 will pretty much always result in it hanging off the chassis a bit if you're using some sort of battery holder. My custom chassis has about 3/4" more width to mount the battery than the stock chassis does, yet it still hangs over just a bit. I couldn't say if that's the case when using the RCM chassis and Tekno or RCM battery holder, as I don't own any of those :wink:.
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MM, how long is that pack in mm's?
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It's about 140mm.
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