Looking for a buggy project

[BrianG]

Thanks!

I just tried it around the house a little. Still too cold out to really put it through it's paces. I may take it to work later today (depending on temps) and do some drifting on the packed snow/ice in the parking lot.

[jhautz]

Very clean job Brian. It looks nice and balanced. Let us know how she runs.

Nice! I like how you ran the wires. Looks very clean. Very Nice! I glad you were able to squeeze the Quark in there too, it is really a great controller with the Neu motor. It's my favorite combo.

I modded my new Quark in my CRT. It's just great. I wanted to wait until the warrantee was up, but it was thermaling and since I modded it, now it goes forever and no thermals. I can't say enough good things about it.

Very nice. Hope we get to see a vid of it. Good job!

[Sylvester]

Glad to see its finished Brian! NICE work!

[Serum]

Keen conversion Brain! :) tight and sexy! I am using my Festool wood router with a 45 degree bit (with bearing) to make 45degree chamfer on aluminum. perhaps you can do something with that info..

[BrianG]

Thanks guys! I'm glad it's finished too!

I was hoping for a slightly cleaner wire routing, but I ran out of room. But I was able to put all the excess wiring, the UBEC, and the capacitor (for the UBEC) in a little box under the ESC. The steering servo wire was VERY long, but instead of shortening it, I wrapped it around an itty-bitty space under the receiver.

The Quark is silky smooth so I'm glad I chose it over the MM. I set the neutral range to narrow and now slow speed control is impressive IMO, not that I'll be going slow much. :)

Serum, what do you think I should chamfer? Unless I find a weakness in the current design, this project is done, but I like to keep new ideas in mind for future projects.

Brian, my Jammin buggy is very similar to the Hyper 8. I was wondering what was involved in mounting your battery packs the way you've done (very neatly).

Are they bolted into the chassis only? Are you using spacers to raise the chassis side to make them level with the dust guards? How much height clearance does it leave below the canopy?

[BrianG]

Yes, the battery trays are bolted only to the chassis. I didn't want ANYTHING on the plastic dirt guards, especially something as volitaile as Lipos. Don't need to be dragging my Lipos over dirt and rocks if the dirtguard breaks! :026:

Anyway, I used some nylon bar stock as a spacer because it is light, easy to work with, and self threads easily. I think I got it from McMaster Carr. It's about 10mm thick and about 20mm wide IIRC. 10mm is the perfect height to clear the dirtguard "nibs" (the little protrusions that the screws go into). Below is a pic of what I mean - the screw placement in the final design is a little different than this, but you get the idea:



As far as canopy clearance, I'm good. The shallowest part of the body is right at the edge of the sides, and the batteries don't go over that far. I still have about 3/4" or more of clearance at the worst spot. However, I did raise the body mounts about 6mm to gain a little wire clearance, so make that about 13mm without the raised body.

[BrianG]

Well, after playing around with the buggy a little outside (difficult to find dry pavement with all the snow melting around here - but I'm not complaining!), I am quite happy with it. It is VERY fast...almost too fast from what I calculated. That got me thinking a little and then found that I got the 2d rather than the 2.5d! Lol, that would explain the difference in speed! I may have to drop from a 14T to something a little smaller like a 12T or 13T for cool running this summer.

You should be pushing over 50+ mph with the 2d; you think the quark could handle such a hot motor? Also, was it a shipping error that got you the 2d or you mistakenly ordered it?

BTW your buggy looks really good!

Bye:018:

[BrianG]

Thanks! No, I ordered the 2.5. I think it was a simple shipping mistake (I verified my order). Unfortunately, I didn't notice it until I started questioning why it was going so fast. lol. I obviously soldered it up and ran it so I can't just exchange it. No biggie really.

I think the Quark will be just fine, especially since I've added a little extra cooling. I'm more concerned about the batts heating up under the extra load in the heat of summer. I emailed Mike asking what he thought. If it will run a little hot, I'll just see if I can order a smaller pinion to reduce the motor load a little.

Edit: Wow, I already got a response from Mike! He says I should be fine. He's running the Quark with the 1515 1y in his Maxx with no pack heat issues. So, I think I'm all set.

[jnev]

Sounds good. So about how much did this system set you back... like the 125B and Neu 1512/2d. Also, are you using a UBEC? And from what cemetary said, it'll be pushing 50mph, what kind of run time(s) are you getting?

Mike is making a motor mount for me right now for my 1/8 buggy, so I am still deciding what system to run in it.

Thanks

[BrianG]

I don't even want to think about how much this cost me; I'd have to shoot myself! :002: You can probably get a pretty close figure by adding up the parts from the RCM store, then add the base kit. Then, there's the metal stock used for some of the custom parts. Not to mention the time. Ugg. Makes me cringe just thinking about it.

Yes, I'm using a UBEC. The UBEC, capacitor (for the UBEC), and any extra wiring is located in a custom box under the ESC to keep everything tidy. :)

I haven't run it enough in one shot to get a runtime figure yet. I was outside for about 10 minutes at a guess and the batts didn't dump, and they were at a storage charge of about 3.8v/cell. Hard to say. I'm hoping for a solid 25 minutes. If not, I'll just pick up the 2.5d later and use the 2d in my Revo since it has more gearing options.

[jnev]

Cool. Once you do get a full run time, do you think you can PM me the run time, or post it here? One last question, lol (sorry for so many)... with the 2.5d and everything else the same, do you think that the speeds would be able to remain between 45 and 50mph? Will the run times also be significantly longer than the 2d? I was tryign to use your speed calculator, but wasn't sure what to put for gearing, or tire diameter of a 1/8 scale buggy tire.