Electric & Nitro Dragsters

[studysession]

Anyone using a dragster for their project?

If you go electric - 2wd has less drag. It is pleanty long enough to help with handling and there will be room for MANY cells with next to no mods.

Curious if anyone else using these or not.

[mgs9]

Mine is sorta like a dragster but shorter for handling reasons. I just barly started it. It will have duel eletric motors, and the rear part of the chassi is aluminum, but its not a pan. I dont know how to explain it but the the plates are vertical (2 parallel plates).
I have an auto cad drawing of it at my school, ill try to post them tomarrow. I dont have auto cad on this computer so ill save it to a floppy but in paint so i can open it on this computer.

[studysession]

Sounds cool.

I have been using touring cars so far for my testing. I am getting an electric dragster to play with and see what it can do. The wheel base is right about 14 inches. I will compare it to the touring cars in handling and performance.

I was talking to a guy who races them in the US. When doing RC drag racing they 135 feet which is 1/10 of a quarter mile. His was clocked 1.61 seconds doing 85MPh on the 135 ft strip that they race at. He was using a brushed motor on a micro switch.

For those who do not know, micro switches are just on off switches. They do not use an ESC. Just hard wire the batteries to the motor and use a servo for on or off. So it is full power ALL the time.

After listening to this guy back in the US, I figure there are most likely people out there that will use drag cars for the speed record attempt. I am curious how many dragsters will show up at this competition.

Good stuff!

[mgs9]

I didnt got to school of friday, so I dont have the auto cad pics.
I have been looking and i cant find what i need for the drive train. My drive shaft is perpendicular to my rear drive axle and i need somthing like a drive train like on the tc3 but i need it like a 1;1 ratio. Any help would be appreciated.

[studysession]

Are you thinking of using this in the Car Action challenge?

If so, I dont think a 1:1 ratio is what is needed. A lot will depend on the motor you use and if it will turn the gears fast enough at that high of a ratio.

I would like to see pics and might be able to give you some input.

[mgs9]

no sry i accendently posted it i wasnt finished with the post its actily like a 2.5:1 ratio.

[studysession]

A lot of those kinds of parts, I just make on the mill and lathe. I am taking a machining class to help me get better at it. I have made custom adaptors for different motors and drive shafts to allow those kinds of gear ratios on almost anything.

Problem is having the motor that will get it up to speed fast enough before it is out of range from the radio. So you need fast acceleration as well.

If you got that kind of low gear ratio, what kind of motor are you thinking about using?

[mgs9]

Im not sure.Probly these brushless motors that i saw for an air plane. The looked realy good though, 5500rpm Per volt i calculated it and if I run 12 volts on them i will get 66000 rpm. I forget what site it was on ill try to find it. I will also be running duel motors for added torque. Right know i have two realy crappy motors for testing and measuring, 2 scorpion 20turns. The only down side to the duel motors is the extra batteries im going to need, witch means more wait.
I dont know if ill make it to the FCC but ill try, if i do make it thats what ill run.

[studysession]

Brushless motors have a max RPM limit. You have to check the specs on the motors and see. Some of the plane motors only go upto 16 - 20 thousand RPMs no matter how many cells you hook up.

[mgs9]

I dont know much about brushless motors. It said 6-10 cells so i wounder if it will increas to 10 cells? With 10 cells it would still be 55,000 rpm. Here the site I realy have no clue if they would work or not. Never mind any way i just relized theye were 480's.

[studysession]

There are advantages of putting more cells. More cells will give it more starting power when under a heavy load. But once the maximum RPMs of the motor has been reached, it will not go any faster. The extra cells just gives it more power to push at that point.

[studysession]

Look at the Lehner motors -

They have the low end torque and the high RPM's. Best of both worlds.

[mgs9]

Do you know of any good brushless motor sites? Thoes plane ones were only 480's I need like 540 or bigger.

[studysession]

All your answers will be answered by searching here:
http://www.radiocontrolzone.com/foru...play.php?f=335

Here is a resource for Lehner motors
http://www.bk-electronics.com/catalo...75d8 67a76f44

[mgs9]

Hey thanx. Are you going to run in the FCC?

[studysession]

Yes - I was sponsored to try to break the world speed record before that was announced. That just pushes me to do it sooner.

[mgs9]

oh cool. who were you sponsored by? I think it would be hard to gat a sponsor. I asked my local hooby shop if they ever heard of the WFCC they didnt know.

[studysession]

By a few different manufactures.

It is not always easy getting sponsorships. A lot has to do with your experience.

[mgs9]

Do you race pro, my brother has a freind that races for team losi, they saw him racing at a track some how and thought he was realy good.
I was looking at that one site you sent me and how muck diffrece is there between the "LTM basic" and the "LTM series 2280"? Im a cheap a$$ so i would get the "LTM BASIC" if theres not to much differnce because there like $100 cheaper.

[studysession]

I have a 5300 basic - it is a great motor. It is fast and have loads of torque. Depends on application on which motor you want.

Now for beating the world speed record, you need the right motor for your car. Everyone's setup is different. So I cant say this motor will definately or a different motor will definately work. You and I can have same car and set them up so differently that we need completely different motors to run.

[mgs9]

true. I was on ebay to see if i could find any brushless motors for cheap but know body realy had any. I think mabey 4 things came up.

[jimbow]

that would not be the smartest thing to use a dragster.
1. dragsters are frickin huge. hugeness = heaviness.
2. everyone associate dragster spoilers with speed. not true. dragsters are made to haul ***** off the line. the spoilers only keep the thing planted. i think i would use a modded touring car chassis. since you can use as much space as u need to get movin, you dont need the hauliness off the line, and therefore you dont need as much downforce.

[Fastcar]

Originally Posted by jimbow

that would not be the smartest thing to use a dragster.
1. dragsters are frickin huge. hugeness = heaviness.
2. everyone associate dragster spoilers with speed. not true. dragsters are made to haul ***** off the line. the spoilers only keep the thing planted. i think i would use a modded touring car chassis. since you can use as much space as u need to get movin, you dont need the hauliness off the line, and therefore you dont need as much downforce.

All I can say is wrong!!!!

[studysession]

For the worlds fastest RC car - I don't think you would get a brushless motor good enough off EBay. Sorry.

As for dragsters - they are really light. Are they the right car for the job - that we will have to see. I really want to know who is trying to use a drag car in their project.

[cool head]

megatech has a new dragster, looks very easy to mod. and looks like it could reach triple digits fairly easy with a high end 21 and some custom gears.
http://www.megatech.com/product_deta...ce.php?ID=7810