LiteSpeed: My speed record attempt car... - Page 3 - RC-Monster Forums

vassmar · 03.29.2008, 08:52 PM

Bad luck about the body. I am running a pancar body on my car atm, the orange on in the ava. But i think it's generating abit too much dowforce for really high speeds. So I actually ordered the Dogde Charger HS from Stormer earlier today hehe.

Looking forward to those updates

lincpimp · 03.29.2008, 10:08 PM

Hmm, the only body I found that would work well over 50mph was a 200 lola body. Can't remember who made it, maybe proline? Anyway it worked great, up to 80 or so. That was on a windless day, on a windy day it made so much down force that the rear shocks could not keep the chassis off the ground! Oh well, my quest for speed was ultra budget, a tamiya tt-01 with a bearing kit, and a 380c 6s motor on 3s lipo with a mm. Pretty low tech, but it easily did 75, and had more to go. I just need to find a larger area to test it.

Dagger, your idea looks great, I had a stock version of your chassis and just could not make it work, it was all over the place. I could have spent more time on it, but decided to get into converting nitros!

lutach · 11:16 PM

These might be good.

http://www.shopatron.com/product/par...7260.17959.0.0
http://www.shopatron.com/product/par...7260.17959.0.0
http://www.customworksrc.com/Product...002-1057795266
http://www.mcallisterracing.com/racing/page10.html (Some awesome bodies)
http://www.mcallisterracing.com/racing/page8.html

03.30.2008, 03:32 PM

Remember at high speeds the drag is so much that the rigity of normal lexan shells will be insufficient and will need some reinforcing or a whole new shell made in carbon.

I have to say that you have got me thinking about making an top speed car now out of an old tc3 chassis i have sitting around doing nothing.

Mod Man · 03.30.2008, 03:54 PM

Quote:

Originally Posted by chilledoutuk

you have got me thinking about making an top speed car now out of an old tc3 chassis i have sitting around doing nothing.

World recored 134.4 MPH set with a lightly modded TC3 chassis.

Matt

Dagger Thrasher · 03.30.2008, 07:55 PM

Thanks for the links there Lutach! Unfortunately I've checked out most of those bodies already, and most of them aren't really aerodynamically suitable...either too much downforce or too much lift/drag. The Oval shells you've pointed to would be fantastic, but they're all slightly "skewed" for oval racing...so in a straight line could cause weird stuff to happen lol. Thanks for the effort though.

Vassmar, you copy cat...lol, just kidding man.

LincPimp: Thanks man. Hopefully with the inclusion of an undertray and the rear diffuser, it should stay glued to the ground with a less aggressive-downforce shell.

Chilled: Don't worry, I've been considering that. I may use some carbon tubing to add support to some more critical area...but it depends on the shell of course. I have another shell in mind which might be up to the task.

Again, thanks for all the support guys! I have a bunch of parts on the way, so I'll post an update when they get all fitted up.

lutach · 03.30.2008, 08:10 PM

Quote:

Originally Posted by Dagger Thrasher

Thanks for the links there Lutach! Unfortunately I've checked out most of those bodies already, and most of them aren't really aerodynamically suitable...either too much downforce or too much lift/drag. The Oval shells you've pointed to would be fantastic, but they're all slightly "skewed" for oval racing...so in a straight line could cause weird stuff to happen lol. Thanks for the effort though.

Vassmar, you copy cat...lol, just kidding man.

LincPimp: Thanks man. Hopefully with the inclusion of an undertray and the rear diffuser, it should stay glued to the ground with a less aggressive-downforce shell.

Chilled: Don't worry, I've been considering that. I may use some carbon tubing to add support to some more critical area...but it depends on the shell of course. I have another shell in mind which might be up to the task.

Again, thanks for all the support guys! I have a bunch of parts on the way, so I'll post an update when they get all fitted up.

Check into the oval shells. Some of them are not skewed for oval racing. Nic used an oval shell in his 160mph Intimidator.

Mod Man · 03.30.2008, 08:19 PM

Quote:

Originally Posted by lutach

Check into the oval shells. Some of them are not skewed for oval racing. Nic used an oval shell in his 160mph Intimidator.

Yup, I have two of those "Bullet Wedge" bodies here new and untrimmed for sale.

Any takers?

Matt

Revracer · 03.30.2008, 08:57 PM

i was looking into building a f103gt into a speed car before, but went against it since 2wd on such a light car with so much power would be dang near impossible to drive... actually looked into making an aluminum chassis to make it heavy enough to give hard traction but never did anything about it. and i was looking at pictures on tamiyausa.com of the f103... and the gt seems to have a graphite or cf chassis?! or is it just a look thing? not all pieces are, but it looked like the top piece deffinetly was... what about an outrunner. literally a direct motor to wheel drive? that and a big nasty 5 or 6s lipo under a 1/8 lola body.with some seriously stiff springs.

Dagger Thrasher · 03.31.2008, 12:57 PM

All of the McAllister oval shells are skewed with exception to the velodrome shell; I emailed them to check. Annoying, but true. I wonder what shell Nic used (Mod Man, sorry, I'm not sure if you're being serious or joking there?...hard to tell through text lol). I do have another shell that I'm looking into though, which may do the job.

RevRacer, yep...it'll be tricky. But with the right tyres and gyro - even if dialed out at high speed - it should be controllable (Nic demonstrated that with his Intimidator which can't be much heavier...and without a gyro I believe). The stock F103GT uses a material called CSC...at least, something very similar. It's kind of half-way to carbon fibre, with it using fibre glass for every-other layer, instead of carbon for the whole sheet. It's cheaper, and almost as rigid as carbon...but also a fair bit heavier.
An outrunner isn't a bad idea, but it'd require a complete re-engineering of the rear end...and would also mean that I can't have a diff. The current setup should be still quite efficient, and much easier to make. Thanks for the idea though. :)

lutach · 03.31.2008, 01:59 PM

Quote:

Originally Posted by Dagger Thrasher

All of the McAllister oval shells are skewed with exception to the velodrome shell; I emailed them to check. Annoying, but true. I wonder what shell Nic used (Mod Man, sorry, I'm not sure if you're being serious or joking there?...hard to tell through text lol). I do have another shell that I'm looking into though, which may do the job.

RevRacer, yep...it'll be tricky. But with the right tyres and gyro - even if dialed out at high speed - it should be controllable (Nic demonstrated that with his Intimidator which can't be much heavier...and without a gyro I believe). The stock F103GT uses a material called CSC...at least, something very similar. It's kind of half-way to carbon fibre, with it using fibre glass for every-other layer, instead of carbon for the whole sheet. It's cheaper, and almost as rigid as carbon...but also a fair bit heavier.
An outrunner isn't a bad idea, but it'd require a complete re-engineering of the rear end...and would also mean that I can't have a diff. The current setup should be still quite efficient, and much easier to make. Thanks for the idea though. :)

Nic used the one from Custom Works.

Mod Man · 03.31.2008, 04:02 PM

Nic used the Bullet Wedge body from Custom Works (one of his sponsors). And yes I am totally serious. I have two new bodies I am not using. :)

The Bullet Wedge is totally symetrical.

Matt

Dagger Thrasher · 03.31.2008, 04:09 PM

Hmmm, ok. That's tempting, and thanks for the offer, but I'm thinking that the Bullet Wedge might have a bit too much downforce for LiteSpeed once it gets up to speed? The Camaro Open shell that Lutach linked to looks less aggressive in terms of downforce, so that could be an option, and there's also another low-drag shell that I'm looking at getting but waiting for more info on.

You wouldn't think that sorting out a shell would be such a hassle lol! But at these speeds, every detail matters I guess... :)

Revracer · 03.31.2008, 04:15 PM

wait your planning on using a neu with 4500w right? thats what your "litespeed" thing says... thats over 6hp... the car stock weighs only 2.67lbs... thats a power to weight ratio of like 2.258hp:1lbs... thats unheard of. how will you get power down. its a sick idea but i think your looking at way too much power. the perfect car would have a 1:1 power to weight ratio... what kind of gearing are you going to be using? and can the f103 take any standard 48p gear?

Dagger Thrasher · 04:44 PM

The thing is, the motor can chuck out 4,500W (very roughly for a short time period) if it *needs* to, to achieve a certain speed (like to get those last few mph out if it hits over 140). For most of the acceleration curve the motor will suck quite a bit less current as it's under less load, making less power as a result. I should be able to use some programming tricks on the React to get acceleration a bit more manageable, and the F103GT can take a variety of 48P spurs. The tyres will spin before a spur strips, so that shouldn't be an issue. :)

By the way, the motor pod plates have been re-designed a bit to lower cost (Metal Man, you were right in saying I should enlarge the radii lol) and also to get rid of some mistakes in my design lol: