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FG 1/5 scale drag car

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Old 07-31-2007, 08:48 PM
  #26
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Default RE: FG 1/5 scale drag car

I'll try to get a good picture this weekend at the drag strip or at our practice track.

If it will go 3 seconds or quicker I would be amazed. I guess my F1 did do 3.5 at 37mph.
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Old 07-31-2007, 09:15 PM
  #27
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Default RE: FG 1/5 scale drag car


Quote:
ORIGINAL: Taildrager

Your pro to type drag car looks like something out of the late 80's Why not do it right if your going to do it at all.
Wow.. A bit dickish?
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Old 07-31-2007, 10:20 PM
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Default RE: FG 1/5 scale drag car

Well, I never replied to this the first time around, but I guess I always liked the 80's style cars. The first time I went to the drag strip with my Dad was in a 65 Shelby Mustang that happened to be brand new at the time and I raced through the 70's and 80's. My personal best was about 9.90 at about 130mph on a bike. The 80's old school was good for me.
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Old 08-02-2007, 10:32 PM
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Default RE: FG 1/5 scale drag car

M.R. Ogle,
Here are a couple pictures of my car, will they work to photo shop?
Hope that the weather holds for the race this weekend, they are talking rain.
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Old 08-03-2007, 12:57 AM
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Default RE: FG 1/5 scale drag car

That'll work....


You're gettin' pretty crossed up during your burnout, though...
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Old 08-03-2007, 07:49 AM
  #31
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Default RE: FG 1/5 scale drag car

Wow! is that cool! You must have that down you did it so fast.
I see a new backdrop for my desktop. Thanks.
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Old 08-03-2007, 05:15 PM
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Default RE: FG 1/5 scale drag car


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ORIGINAL: M.R. Ogle

That'll work....


You're gettin' pretty crossed up during your burnout, though...
Very nice - love your work.
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Old 08-07-2007, 09:50 PM
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Default RE: FG 1/5 scale drag car

I spent the day Sunday at Mn. RC dragway. Just to see how it all worked they let me make a couple of runs with my car. It turned 3.4 at 41mph, and I think it needs some lower gearing yet.
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Old 08-07-2007, 11:55 PM
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Default RE: FG 1/5 scale drag car

Right on!!! Just shave a couple tenths with gearing, and it'll be right there!! I'm getting ready to take mine back out to test, too... I'd be just fine with a 3.4 first time out!!!
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Old 08-18-2007, 06:07 PM
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Default RE: FG 1/5 scale drag car

After I ran the car I realized that I need to gear the car down. I located the parts from a WCM dealer and I've been trying to figure out the top speed of the car with the lower gear. A math wiz friend of mine came up with this equation, does anyone have a easier way.

Here we go : peak RPM 20,000 divided by gear ratio (42/22=1.91) (20000/1.91=10471.2) divided by final drive (78/16=4.875 )(10471.2/4.875=2147.93) which is the RPM of the rear axel. Now we need to figuare out the roll out of the rear tire, my tires are 7" tall so we take 7x3.14= 21.98. Then take RPM of rear axel (2147.93x21.98=47211.50 then divide by 12to get feet instead of inches =3934.29) then multiply that by 60 to get minutes per hour (3934.29x60=236057.5) then divide by 5280 to get miles per hour (44.70mph).

Considering when I do the same equation with my present gear ratio I get a top speed of about 70mph, which I know the car will never pull in 132ft. What does everyone think, did we miss step or does it seem accurate.
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Old 08-18-2007, 06:38 PM
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Default RE: FG 1/5 scale drag car


Quote:
ORIGINAL: warren528

FG PERFORMANCE RC,
Did you guys try this car, seen like it should hook pretty good with transbrake and rear tires. I would like to try your car against my modified 1/5 scale in 132' or more.
Warren528
Do you drag at Zephyr with Reggie?
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Old 08-18-2007, 06:43 PM
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Default RE: FG 1/5 scale drag car

I've seen many, many different formulas and calculations over the years to try to predict on-track performance... and let me say this... they simply don't work...unless you're running in outer space with no gravity, no friction or parasitic drivetrain drag, at "peak" rpm, and with no pesky air molecules to slow you down. Which you're not.... not even considering the engine's changing torque curve in just a 132-foot run.

Run the car, make a gear change... run it again... that'll tell you whether you're going the right way or the wrong way. No amount of time behind the calculator will ever be able to figure out your ET or speed that you'll actually get on your time slip.

Believe me. I guessed wrong the first time out with my car, so i re-geared my car three times... just read the time slip. and kept bumping up the foinal drive ratio until the ET stopped dropping and the mph stopped climbing.

There's NO SUBSTITUTE for real track time.
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Old 08-29-2007, 07:51 PM
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Default RE: FG 1/5 scale drag car

You interested in making the wheels and tires for the open market?
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Old 09-16-2007, 11:08 AM
  #39
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Default RE: FG 1/5 scale drag car


Quote:
ORIGINAL: Paul Songas

The track link is www.mnrcdragracing.20m.com

We run the standard 132 foot track.

I thought 264' was the 1/4 mile scaled down to 1/5.

Anyways just asking...
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Old 09-16-2007, 12:05 PM
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Default RE: FG 1/5 scale drag car

Our track is 1/10 scale.
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Old 10-02-2007, 09:36 PM
  #41
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Default RE: FG 1/5 scale drag car

Last time I ran the car I could tell it was geared for too much top end 20/42. So I regeared it to a 16/78, and now it jumps off the line. With the two speed should have about a 55mph top end.
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Old 10-03-2007, 04:14 PM
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Default RE: FG 1/5 scale drag car

Here's what I've done in research for gearing on the 23CC drag cars:

I think I'm getting there, figuring out the correct final drive ratio for my car. It has two primary gears, then pulleys from the halfshaft to the rear axle.

15/48 gears 16/72 pulleys..... (14.4:1) way too low, car spun it's tires hard but topped out at 65 feet.

15/48 gears 21/48 pulleys... (7.31:1) too high, stripped rear belt (at Minnesota).

21/40 gears 16/72 pulleys... (8.55:1) Better, ran at Chicago like this (best of 3.15 ET).

20/44 gears 16/72 pulleys... (9.9:1) Will try this ratio next time out

20/44 gears 14/72 pulleys...(11.3::1) May also try this combo. May be good on a treated track where the tires stay hooked up, and will work the clutch real hard.

This is what I've tried so far. I'm surprised that the sweet spot is so narrow on these motors, but they're pulling 25 pound cars through a centrifugal clutch, so you gotta pay close attention to what the car's telling you.

Of course, with a two-speed, you'll have more options, and you can gear low to come off the line hard, then shift up as to not run out of steam halfway down track. My car ran 3.15, which was pretty good, but Guy Hilleary was way under three seconds with his, best of 2.78, I believe.
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Old 10-03-2007, 07:51 PM
  #43
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Default RE: FG 1/5 scale drag car

Saw you gear ratio, it really helps me see how I want to gear my car, because my first gear is very simular to your original gearing, which spins the tires way to hard so you have to drive it off the line. 16/48 primary gearing and a 16/78 final drive. so now for 2nd gear I'm going to try a 24/40, which seems to pull a pretty good top end speed. I hope it doesn't rain on Sunday so I can get to the track to try it out one more time before the end of the season.
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Old 10-03-2007, 08:15 PM
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Default RE: FG 1/5 scale drag car

Yeah... That's a big ratio spread between first and second (3.0 to 1.6:1), so listen to make sure the car gets "on the pipe" before it tries to shift into that tall second gear, otherwise, you'll keep the engine kinda "bogged" below it's optimum power-producing RPM range throughout the entire pass.

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Old 10-08-2007, 08:32 PM
  #45
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Default RE: FG 1/5 scale drag car

Well I went to the drag strip this weekend and they let me make quite a few runs. Thanks Paul. It took about 2 or 3 runs to get the 2 speed dialed in, by the end of the day the last two runs were 3.28 @ 39.8 mph and 3.15 @ 40.58 mph. I think I can lower the second gear down a notch to get better times. Not bad for only the second time at the track. They have one more weekend this season but I won't be able to make it so we will have to wait for next year. I guess it's time for a new winter project.

Mr Ogle in your video of awhile back there was a couple of altereds, you wouldn't happen to have a couple of decent pictures would you? I used to have the real thing and it would be fun to make a RC version.
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Old 10-08-2007, 08:39 PM
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Default RE: FG 1/5 scale drag car

That's right in there!!! 3.15 is a haulin' pass. Must've felt pretty good on that one!


This is a better pic, and where i got the body:

http://www.legendaryreproductions.com/default.aspx
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Old 10-08-2007, 10:11 PM
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Default RE: FG 1/5 scale drag car

FG,, Sounds like your getting the Car Dialed in.. I'v been keeping an eye on this thread with you and Mike,,,You will have to check out My cars if you like Altereds...I have a company called Nitro Rage RC,,, I'll post a few pics here of 2 of the cars I make.. We are selling our Alky burning Blown Injected 48 Fiat We ran in Nostalgia Drag Racing..{{ Thats a Full Size Car}} I built that too.. Mike knows about my cars He even helped me get started with help on were to Buy Foam Rubber for my Tires and Other things... Oh and I will be running a 1/4 scale Funny car next year along with the cars I sell and Build... John. P.S. I might be building 1/4 scale cars too along with my 1/8th and 1/6th scale cars....
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Old 10-09-2007, 08:11 PM
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Default RE: FG 1/5 scale drag car

Mr. Ogle,
The altered you built looks great, It appears to be the same chassis you run on your funny car? I looked over the web site and couldn't tell which body you used? As far as the engine is that something you made yourself or is it something you bought?

Nitro,
Your cars are almost a work of art. What size nitro motor are in those? Do you sell the bodies or misc. parts?
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Old 10-10-2007, 08:14 AM
  #49
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Default RE: FG 1/5 scale drag car

Okay... You asked...

The supercharger and scoop are from a 1/8 scale "Muscle Machines" RC toy car...
http://archives.musclemachines.com/r...e_ab/index.asp

The engine ""block" is some folded-up thin aluminum sheet.

The two valve covers are clear plastic acrylic drawer organizer inserts from The Container Store, sprayed silver inside and with some chrome mylar tape applied:
http://www.containerstore.com/browse...3&PRODID=61551

The plug holes are 1/4" rubber grommets from Radio Shack, as is the red plug wire.

The exhaust pipes are silicone 1/8 scale exhaust tips...
http://www2.towerhobbies.com/cgi-bin...?&I=LXRHS9&P=7
Rubbery so they won't break off.

The belt pulleys are 1:10 scale F-I car wheels, the belt is an elastic child's belt, the magneto was built from another 1/12 scale car wheel and a film canister cap.

And you're probably laughing by now.... But, hey... It looks like an engine to me...


The Body is from Mike Casey's Legendary Reproductions:
http://www.legendaryreproductions.co...ategory=bodies

I just chopped the hood out, just used the body and grille shell.

And, yes, I swap bodies between the funny car and the altered... twice the fun!
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Old 10-10-2007, 09:26 PM
  #50
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Default RE: FG 1/5 scale drag car

Ingenious!
I figureed it was a bunch of odd ball parts but that shows a lot of imagination.
It looks great and I think its something I would want to build this year. I have acouple of engines and motor mounts and I'm building a rear axel with WCM parts, did you use 1/2" aluminum?
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