FWD-GT TOP SPEED CAR

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romulus22
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FWD-GT TOP SPEED CAR

Post by romulus22 »

After many years of wanting to pull this off. And finally actually starting on it. I am now to a point to where I feel like I can show you what I've had envisioned in my head. I'm still a little ways out. Couple more pieces to fabricate. More parts in the mail still. Temporary hardware just holding it in shape. The reason I chose FWD for a top speed car goes back to my experience with my old Tamiya FWD new beetle. After getting bored with the car I would stick two stick packs in there wired in series, throw in a 10t mod or whatever it was. That thing was a missile that was so easy to go fast in a straight line with. As long as I was on the throttle it went straight as I wanted it to. So that leads me to this car. But ill let the pictures do the talking.

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And some of the behind the scenes that I've been holding back on posting till I had more to show. The cardboard rectangles represent the battery placement. I will have a litte holder and Velcro that hold them in. The plan is start on 4s and move up to 6s.

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And the chassis cutout. I've cut little parts with a dremel before and it was kinda time consuming. Not this time :mrgreen:

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Thanks for looking guys. I'm really excited about this project. Just wish I didn't start on it so late in the year.

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Re: FWD-GT TOP SPEED CAR

Post by Jedi Master »

Look forward to seeing this progress! Awesome! 8)
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Re: FWD-GT TOP SPEED CAR

Post by GoMachV »

Looks great! If you ever get bored with fwd just add another trans and motor

I always wanted to build this:
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Re: FWD-GT TOP SPEED CAR

Post by Phin »

Pretty sinister looking speed demon you're building there. :twisted:

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Re: FWD-GT TOP SPEED CAR

Post by Diamond Dave »

What Castle motor is that one? I can't read the can, 4000Kv? Looks like it is going to be a serious land rocket.

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Re: FWD-GT TOP SPEED CAR

Post by justinspeed79 »

Wow, it's beautiful! 8)

I hope you were wearing a mask when you cut that carbon! Not that I really have any right to talk, I don't wear one as much as I should. :roll:

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Re: FWD-GT TOP SPEED CAR

Post by LoboNYC »

Two Words....

LAND MISSILE

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Re: FWD-GT TOP SPEED CAR

Post by proffesso »

http://www.fastestrc.blogspot.com.au/

and fastrc are good (although old now) highspeed run cars.

ive got a hpi speedrun 10l that I need to finish off too
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Re: FWD-GT TOP SPEED CAR

Post by romulus22 »

The motor is a 4600kv. It's max rpm is 100,000 rpm and 6s technically achieves higher. But I know the aerodynamics will be holding the car back before I reach those kinds of RPMs.

And when I was cutting this, I can't tell you how fast and smooth the cutoff wheel went right through this stuff. I would guess it took less than 5min to cut the chassis out. I do still need to do a little filing inside the front suspension openings. But the long cut looks and feels just as smooth as the factory outer edges that the sheet came with. I also was expecting a little chattering or hopping. It literally slid right through like it was cutting butter.

justinspeed79 wrote:
I hope you were wearing a mask when you cut that carbon! Not that I really have any right to talk, I don't wear one as much as I should. :roll:
I held my breath as I was making a cut. That works the same right :mrgreen:

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Re: FWD-GT TOP SPEED CAR

Post by Sixtysixdeuce »

That's a pretty cool build!

However,
The plan is start on 4s and move up to 6s.
4S is gonna toast that can in short order, 6S even faster. Per a conversation with the manufacturer, those Castle 540 motors are designed for 2S, can handle 3S in lightweight applications. ESC is irrelevant.

Part #.............CMS-4600
Price..................DISCONTINUED
Input Voltage......12 NiCad/NiMh MAX
........................3s LiPo MAX
Size...................1.4" dia. x 1.7"
Weight
(w/wires)............7.0 oz (198.4g)
Shaft Size...........Standard 1/8" (3.2mm)
Bearings..............Oversize ABEC-1 front and rear
Connector Type....4mm gold connectors
Note...................Motor wires OK to shorten


http://www.castlecreations.com/products/cms36-4600.html

I don't even know of any 550 cans that can take 6S
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Re: FWD-GT TOP SPEED CAR

Post by romulus22 »

I knew the can was technically a 3s max. Guy I got the advice from when purchasing the combo ran his on 4s all the time with no issues at all. The 6s was a plan if the 4s doesn't achieve the speed I'd like. I honestly don't know much about these motors but I don't plan on bashing like some would in a big heavy vehicle with big tires. My temps should stay relatively low making 10 second runs every 10 min or so. Ill be surprised if the car goes past the 4lb range. With the higher gearing on 6s the load will also be less. We'll see I guess but you may be correct.

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Re: FWD-GT TOP SPEED CAR

Post by terry.sc »

The problem of using a higher voltage than the motor is rated at is nothing to do with the load on it from the gearing and chassis weight, but entirely due to the maximum speed the motor can run at. Spin the motor at a faster speed than it is designed for and you can end up with the rotor magnet attempting to escape the can by going through the motor windings. It is why Castles 5700 motor is their 'fastest', because while they also make a 6900 and 7700 motors, running those on 3S like you can with the 5700 would destroy them.
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Re: FWD-GT TOP SPEED CAR

Post by romulus22 »

The 4600 motor on 6s is 102,120rpms. The can has a max rpm of 100,000. I highly doubt I would max spin the motor while the car was driving. On 4s it would only be running 68,000 RPMs

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Re: FWD-GT TOP SPEED CAR

Post by romulus22 »

Been slowly working on the front end over the past couple days. Got a couple packages in the mail today. The body came from an ebay seller who does all the work, I absolutely hate trimming and painting bodies. But he applied every decal too so I have to remove the residue still. Here's a couple updated pictures of what she'll look like for the most part.

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No clue what standard 1 battery touring cars weigh but I threw it on the scale to see about where ill be. After its all said and done it will still be under 4lbs

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Re: FWD-GT TOP SPEED CAR

Post by justinspeed79 »

Looking good. Direct linkage steering?

I have never actual weighed it, but I think my TC5 is about 4 lbs, give or take. That's with a 5800 2s2p and a fairly heavy body. Body is probably half pound by itself.

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