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-   -   CRT.5 build - would opinions on my setup choices (https://www.rc-monster.com/forum/showthread.php?t=7478)

VintageMA 08.30.2007 03:29 PM

Good support from Horizon Hobby - they are arranging a RMA for the charger.

jhautz 08.30.2007 05:30 PM

Quote:

Originally Posted by VintageMA (Post 115380)
JHAUTZ - I'll post some pics on this thread as I am building. A few questions for you if you've thought out some build issues.
1 - What are you going to be using for the battery mount? This is the one place my customization and craftmanship skills always struggle.
2 - Do you think I should get a UBEC as well for the 4S A123? I was going to try the BEC in the MM - but I know I've read a lot that the MM BEC gets hot even on 3S LiPo.

I typically just use some velocro on the chassis and the pack, then strap it down with a gorilla maxx strap. I havent had any issues with it yet. If it were lipo I would make some sort of box out of Carbon Fiber angle stock or aluminum or plastic to protect the cells more.

Yes, use a UBEC for sure. A cheapo will due just fine for this small truck. Just get a $15 one from one of the flyer websites.

Sorry for the delayed response. I didnt catch that you asked a question at the bottom of the post.

Quote:

Originally Posted by VintageMA (Post 115408)
jhautz - What servo are you going to use. I picked up the HiTec HS-5245MG, but I've seen some threads on here about people overheating them with too large tires.

I've always had very good luck with HiTec digital servos, and I am planning on making the jump to 75MHz FM to DSM2 when the Spectrum DX3R radio comes out this fall - so I wanted something solid that I could run at a higher frame rate.

I'm using the same one. Just ordered it a few days ago. Should be here soon. On the plus side the CRT.5 showed up yesterday. (grin)

VintageMA 08.30.2007 10:37 PM

The buggy should hopefully arrive tomorrow for the weekend.

I guess I am still missing the UBEC - can you send a link to one?

Any idea what you are going to use for the diff fluid? I've been reading 3K f/3K c/ 1K r is a popular starting point - but I am wondering if it would be better to go go with the standard 3/7/1 used for buggies - I'm never sure where to start with that as I mostly just bash and don't race.

jhautz 08.30.2007 10:44 PM

Just look around. there are alot of places that sell em. Mike has a higher end one in his store.

VintageMA 08.31.2007 02:40 PM

Just got the CRt.5 in today - WOOHOO!!

Thought this was cool. I ordered it from A Main Hobbies and it came with a 2nd set of wheels :)

Let the fun begin.

BrianG 08.31.2007 04:02 PM

Yeah, mine did too. They have different hub mounting so watch out before you glue the tires on there!

jhautz 08.31.2007 05:27 PM

Quote:

Originally Posted by BrianG (Post 115908)
Yeah, mine did too. They have different hub mounting so watch out before you glue the tires on there!


Different hub mounting????

What do you mean? I thought it was like the Losi or AE cross pin style.

BrianG 08.31.2007 06:21 PM

One set is the cross-pin style, the other uses the hex hubs...

VintageMA 09.04.2007 10:44 AM

3 Attachment(s)
Yeah - I see that - that's kinda a pain in the butt with different types of wheels - I can't really see using the ones with the cross-pins.

Probably going to put all the nitro stuff that came in the kit up for sale on e-bay (just the muffler piece alone is $50 online) so that'll make up for some of the expense on other parts.

Here's a few pics of what I've done so far. The motor mount isn't great (just some L-arms from Home Depot cut to fit along with velcro tape and velcro straps - but seems to be holding well for some trial runs) - I just don't have the tools or the skilz to do some of the sweet work some of the guys here do.

Buggy seems to be running okay. A few initial thoughts
- the shocks seem very soft, I wonder where I can get some replacements that are a little firmer and the right size.
- I started with a 13T pinion and the motor was running pretty warm but the ESC was cool - I'll try to gear up a little to even that out.
-max Amp draw was recording right about 50A using a 3S lipo pack (still haven't gotten the replacement A123 charger yet)
- I need an antenna mount because it's just hanging loose right now

Pluses - I am very impressed with this buggy for $250. I could easily see this little guy put my LST2 on the shelf for a while.

With Mike's motor mount the whole project was made very easy.

I want to use a plastic spur gear - but I think I'll wait to see if Mike ever has one just for this buggy - I don't want to drill too many holes in the chasis.

VintageMA 09.04.2007 10:48 AM

Oh yeah - one more complaint (or whine) is that with the motor mount and servo setup it is impossible to change a pinion w/o first either removing the servo or removing the whole center diff assembly.

You just can't get to the bottom screw with the servo in the way.

BrianG 09.04.2007 12:52 PM

Quote:

Originally Posted by VintageMA (Post 116522)
Oh yeah - one more complaint (or whine) is that with the motor mount and servo setup it is impossible to change a pinion w/o first either removing the servo or removing the whole center diff assembly.

You just can't get to the bottom screw with the servo in the way.

Yeah, that does suck. I thought about making some sort of quick-release for the servo since that would probably be easier to remove quickly than the CD.

VintageMA 09.04.2007 01:14 PM

Just fyi - I meant to say BATTERY mount. Mike's motor mount rocks!

"Here's a few pics of what I've done so far. The motor mount isn't great (just some L-arms from Home Depot cut to fit along with velcro tape and velcro straps - but seems to be holding well for some trial runs) - I just don't have the tools or the skilz to do some of the sweet work some of the guys here do."

jnev 09.04.2007 07:49 PM

It looks great!! Nice job on it! What Hacker motor are you running in there?

VintageMA 09.04.2007 08:35 PM

Quote:

Originally Posted by jnev (Post 116634)
It looks great!! Nice job on it! What Hacker motor are you running in there?

Hey, thanks. It is a Hacker B50 8L (3019kv) motor. Very solid, in my opinion not quite worth the money ($180) but I already had the MM esc. I would place it somewhere halfway between a Feiago and a LMT/Neu. Strong power, but you can feel the pull much more when you use a LMT.

Still a lot of tweaking to do........ but that's just part of the fun.

cemetery gates 09.04.2007 10:34 PM

Looks good! The crt.5 is a great truggy to convert, you will love it.

Its funny how much different my crt.5 looks than others. With the ext. chassis, 1/10 2.2 rims+ tires, full size servo and larger wing+ body its a completely different truggy. I really need to post up a thread of my own, just waiting for the new lipo to arrive (TrueRc 4s 4.2Ah custom pack).

Bye


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