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        Discussion [150 mph?]maybe? questions! for getting me there

#1 mr. arthur1234 Aug 06, 2007 04:01 PM

[150 mph?]maybe? questions! for getting me there
 
hello my racing friends:D

my name is arthur and i like racing (duh?!).
i have a couple of cuestions for high speed,,,,,,

will a ducted fan help (gets more power when it goes faster)...
what tipe of car body do you reconmend...tires etc.......

i'm thinking about custom chassisch (or something :P srry) :rolleyes:

any wais arthur

#2 mr. arthur1234 Aug 06, 2007 04:41 PM

got some plans ready first some sleep :P

#3 noishi Aug 07, 2007 12:42 AM

i think a ducted fan could help get you moving faster, but given the limited amount of thrust and amount of power needed to move the car to 150mph, i dont think its really worth all the work. besiads that, a ducted fan is slow to get the car to its max speed, and likely will require alot fo room. look for a thread around here called carbon fiber supercar or something. it should help you get going in the right direction

#4 mr. arthur1234 Aug 07, 2007 02:20 AM

Quote:

Originally Posted by flyinazn10
i think a ducted fan could help get you moving faster, but given the limited amount of thrust and amount of power needed to move the car to 150mph, i dont think its really worth all the work. besiads that, a ducted fan is slow to get the car to its max speed, and likely will require alot fo room. look for a thread around here called carbon fiber supercar or something. it should help you get going in the right direction


tyvm for your reply... when i was thinking last night i thoughed about that car and with super much brushless power i should be able to move fast...

#5 ronmeister Aug 07, 2007 12:37 PM

I suppose it's possible.
The setup is definitely going to be MASSIVE with a crazy expense on batteries among the other parts.
Also, the wheels and tires will have to be some HIGH end ones so they don't fly apart at those speeds.

Ron

#6 turbored21 Aug 07, 2007 02:37 PM

the thing about goin super fast 150mph in scale is 1500mph if its 10th :P is aerodynamics traction and stability.. then you deal with power .. youll need alot of rpm and alot of hp to get it up to those speeds

you really should have a look at helimodman's threads his car is one of the best ive seen yet.. and its gettin better daily.. you can learn alot from that man

#7 Heli Mod Man Aug 11, 2007 05:35 AM

From my perspective, 150MPH is possible. However, no RC car has achieved that yet (an a number of us are working very hard on it). So, 150 is obviously a very difficult mark to achieve. But, again, I think it is possible. The current world record holder (Nic Case) is a friend of mine. He has been in the 140s in testing, but hasn't topped that mark in competition yet.

Here is my take on what you are looking at;

#1 You need HUGE horsepower.

#2 You need extremely stable and slippery aerodynamics with modest downforce.

#3 You need high end foam or cap tires.

#4 You need a very good grasp of power systems and matching components.

#5 You need to be able to do the math required for gearing, KV to pack matching, etc.

#6 You need HUGE time to build the car and even more time to test it.

#7 You need a large amount of cash (maybe $3000 or so) to get the best equipment possible.

#8 You need long distance to run the car. This is one very difficult item because not everyone lives near a long, straight, smooth road.

#9 You need 1200 feet of radio range. This is also very tough because as far as I know, only the Futaba 2.4 ghz FAAST system achieves that without modding the radio.

#10 Did I mention needing LOTS of time and cash?

Oh, beyond that, you need a huge amount of patience and tenacity. You also need to like the car, but not love the car. The reason for that is, you need to be willing to open up the throttle. It is one thing to build the car, it is entirely another thing to successfully drive it at that speed.

Lastly, a ducted fan does not have the accelleration needed to push the car to the speed needed without running out of radio range and line of sight. The car needs to accellerate at 1.5 Gs throughout its run to achieve 150 mph without losing sight of the car.

Those are the challenges. What are the rewards? Well, very few people have exceeded 100 mph and only a small handful that have topped 110. It is an elite, close knit group. I am very excited to see another top speed contender working on a car. I would merely suggest driving the wheels rather than using a fan or turbine. That will give you the accelleration you need.

Of course, you could always use a rocket engine. ;)

I wish you the best of luck. If you have any questions, PM me or ask here. I will be glad to help you in any way I can.

Cheers!

Matt

#8 mr. arthur1234 Aug 12, 2007 02:32 PM

i was thinking a fireworks arrow(without bomb)
haha that should get me there

#9 mr. arthur1234 Aug 12, 2007 02:34 PM

hello all ,

i am givind a go at it !
i shall make an chassis and steering set up.
power shal be an rocket, dont know if it then really counts but i chose an rocket because of financial resons....

but first im tuning mu multiplex easyglider,,,, after a couple of months (when i have more money) is shal start this project :)

#10 speedy-biker Sep 07, 2007 03:03 PM

how about a pulse-jet?
lots of noise and massive power and relatifly low cost...?
fuel might be a problem and offcourse the noise...

Jacar

#11 ronmeister Sep 09, 2007 03:38 PM

Lots of noise yes, relatively lost cost yes, but massive power, nope!
Just ear bleeding sound with no power to show for it :p

#12 _HypnoToad_ Sep 12, 2007 11:09 PM

if ya wanna shell out alot of money buy yourself an NEU motor.

#13 Associated Freak Sep 14, 2007 10:45 AM

Quote:

Originally Posted by Heli Mod Man
From my perspective, 150MPH is possible. However, no RC car has achieved that yet

Not exactly true... I've seen teather cars break the 200 mph barier... but then again... u dont have to steer it! :D As for a true driveable R/C on-road car i belive that 130ish is the best anyone has done thus far... KEEP AT IT GUYS!

#14 Heli Mod Man Sep 14, 2007 01:45 PM

134.4 to be exact.

Tether cars take a long time to reach top speed. I have less than 5 seconds to break 100 or the run is a waste because the car will run out of sight very quickly. Tether cars can take their time accellerating.

You will notice I said "Possible" not achieved yet. I have run 125mph with 140mph of wheel spin.

The big issue is run up distance to get up to speed. Accelleration is very important in this.

Matt

#15 turbored21 Sep 14, 2007 06:31 PM

well nic actually made an unconfirmed 160mph run and busted a spur or something if i remember correctly and couldnt make the return pass for the record.. it CAN be done.. its a matter of $$ and time and injinuity


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