New hi-speed project

[snellemin]

I believe that if you would put a better rear spoiler you would be ok. That and/or a rear diffuser. That car is too heavy to lift off at those speeds.

[suicideneil]

What about a front wing too, like some buggies have- that would keep the front glued to the road.

[snellemin]

It wouldn't need one if it's the porsche body. It' has a front lip allready.

[gimpygolden]

I use a Mclaren GTR body and it is still loose and all over the place at half the speed your talkin about

[lincpimp]

On my 10th scale high speed project I tried all kinds of bodies. I can safely say that supra, saleen s7, firebird, focus, nsx, and most other kinds of street car bodies are not good over 45mph. My car was very light, and those bodies had hardly any front downforce, even lowered till they touched the ground. I could get up to around 40 and the front would just get light and I would loose it. I finally settled on a lola 200mm nitro body, with the wheel wells not cut out. It had enough downforce that a windy day would cut the top speed down by 5 or 10 mph! Also cause the chassis to scrape the ground, shock limiters are a must! Plenty of traction at 75mph. I could drift it with complete control at 50mph too. excelllent body for straight line speed. I also made some side body posts to keep the flex to a minimun. Only issue was the lack of air low unpder the body. I put a fan on the mm and it was fine.

[snellemin]

Would a wide dragster type body fit on your 1/10th? Plenty of downforce with those bodies.

[lincpimp]

It may fit. I am really happy with the lola body. I will use some fuel tubing as a shock limilter, and add some preload clips to stiffen it up. I need to find a larger area to run, as the car had more than 75 to give, just ran out of road! I have a feeling that on a calm day it should do 80.

[Mod Man]

I have not read this entire thread, but I can tell you that 6S with a 1512 will not be enough to hit 100 mph. My TC4 (126 mph) would not break 94 mph with a 1512 on 6S no matter what I tried. I went to a 1515 on 12S and BINGO, 108 mph on the first wound out run.

Also, stock bodies have major problems above 90 mph.

What you will find is 80 mph is not hard to hit with modern motors and packs. 90 is tougher to hit and requires actual engineering to achieve. 100 mph is an order of magnitude harder and requires some significant effort and aerodynamic R&D. 120 is EXTREMELY difficult to hit! That will require well over 3000 watts, and some crazy tires (Personally I like BSR radials). Oh, to break 100 you will need at least 1300 feet, 800 feet to accellerate, and 500 feet to stop. Radio range fast becomes an issue as well as line of sight.

You guys here on RC-Monster are at an advantage because you are already used to running big power systems. I am glad to know there are top speed guys here.

Matt

Mod Man is the mac daddy of high power, exotic, and wild RC related toys. :D

Take a look at his last high speed car project.

Hi Matt :)

[Mod Man]

A few pics.

Oh, top speed is crazy expensive! I bet it costs me around $20 for every full throttle run when you consider pack wear (I toast packs even on 12S), tire wear, mechanical wear overall, and the occasional encounter with nature.

Matt

[Mod Man]

Hey Aragon! Dude, fancy seeing you here!

I am not trying to hijack this thread, though. Just very excited to see other top speed guys pushing for triple digits.

Matt

[Mod Man]

Originally Posted by Aragon

Mod Man is the mac daddy of high power, exotic, and wild RC related toys. :D

Take a look at his last high speed car project.

Hi Matt :)

You will notice I mentioned hitting 115 on 6S in that thread. That was a reading from a VSM. Apparently I had alot of wheelspin because I finally got a radar gun and found my actual top speed on 6S was 94.

Matt

[jhautz]

Holly #!@@!$&%!! Thats a serious speed setup you have there. Whats the top speed you have hit with that?

Where do you run that thing at those kinds of speeds. I cant find a parking lot big enough and smooth enough to do much over 70. I just run out of room. Any of the lots that are big enough arent anywhere smooth enough.

[Mod Man]

Hey Man! I am up in McHenry! You ough to swing by this summer and check things out.

I run on the street outside my neighborhood (a stone's throw from my house). The street is 1500 feet long, straight and pretty smooth.

I have seen 108 mph on the radar gun and 126 on my VSM. However, with the current setup and gearing, I have not had it full throttle. I run out of road (or nerve) at that magic 108 mph mark. Typically the Eagle Tree shows 80% throttle at 108 mph and 3600 watts. Oh, it accellerates with an innitial burst of over 2 Gs and a continuous 1.3 Gs to 100 mph. It actually accellerates like a top fueler. I cannot believe teh stock FT TC4 diffs and gears tolerate it!

It is geared at 1.9 to one. The wheels spin at nearly 40,000 RPM at full throttle!

On one run, the radar registered 108mph while the VSM registered 140 mph of wheel spin!

You gotta love brushless power!

Oh, I have a vid of it running 90 mph on you tube. You can search under "90mph RC car". The car was no where near its current setup when that was shot. But, you will see it run and you will see my street.

Matt

[suicideneil]

Dude, wow. That things got more gadgets bolted to it than a F1 car....