2014 Cars coming along

[resullivan]

So me and my son are building 4 cars this year.

1. His scout car
2. An outla... oops I mean open division car :sigh:
3. A test car
4. A "pro" car for proxy racing

All 4 have been cut out. 1-3 are pretty much done. I will take pictures of all of them, but here are a few of the scout car. A H frame was cut out and berch plywood was used as a veneer. The front bar was intended to be left, but broke during the cutting process. I was going to leave it, but the veneer was a little raised on the nose since it had nothing to hold on to. We cut a small bar and CA glued it to the front then sanded it flush with the bottom of the car. The fenders are balsa. There is a decent amount of flex in the car. I really question if it matters are not, but I am considering adding balsa in the middle to strengthen the car. Anyway, here are the pics and there will be more to come.

Rough cut and sanded fenders:

Underside of car:

Top of car:

Car with test wheels:

The initial intent was to use monokote to cover entire car as seen above. After one try it was apparent that wouldn't be possible (at least not with my monokote skills). We ended up removing the fenders and using monokote on the body, and my son spray painted the fenders. We used a sealer, a primer, and cheap paint. The monokote didn't go on as easy as last year. We tried a couple of times, but just ended up being ok with a few wrinkles.

 

[GravityX]

Coming along good. The rear fenders are a little big, will you be sanding them down some? You may also want to fill some of the empty space with some dense foam to help reduce body flex and/or vibrations.

 

[resullivan]

Do you think the fenders are to long?

 

[AC Designs]

I am no expert but I had a Street Pro car that had long fenders on the back and it was fast. But after trimming them off the top of wheel I picked up about .005 to .007. But that could have also been that I used a different re-prep process also. So it's up to you if want to cut them back or not.

 

[resullivan]

Like so they don't extend over the wheel? More like the front fenders?

 

[AC Designs]

Yes, mine extended back like yours. I raced it twice with exteded fenders on the back. Don't get me wrong it was fast.But, when I took and cut them back it was faster like said. Here are the times for MOTM race.

Aug with extended fenders 2.9607
Sep without extended fenders 2.9488
Nov without extended fenders and new re-prep process 2.9438

Those are all average times.

 

[OPARENNEN]

Do you think the fenders are to long?

I found out that large long fenders slow the car down due to air current.
In reality, the rear fenders should be not larger than the front.
John's new fenders (non-wood) are the same size for both front and rear.
Also, if you look at some indy and Formula 1 cars, the air deflector in front of wheels is pretty small.

 

[AC Designs]

I found out that large long fenders slow the car down due to air current.
In reality, the rear fenders should be not larger than the front.
John's new fenders (non-wood) are the same size for both front and rear.
Also, if you look at some indy and Formula 1 cars, the air deflector in front of wheels is pretty small.
__________________

+1 that is so true. The F1 cars deflectors are way smaller thamn on the Indy cars.

 

[resullivan]

Those are some big differences. I guess we still have some work to do. I am glad I didn't do both sets of fenders (for scout and SS cars).

 

[AC Designs]

If you look at my profile picture the car on the far right is the one that had the extended fenders on the rear.

 

[resullivan]

Probably going to go halfway between what they are currently and what the front ones look like. Also, going to make it so they don't cover rear wheels.

 

[~JBD RACING~]

All those post are very interesting A/C design...

 

[AC Designs]

JBD I see you want some also. I had a buddy tell me about the fenders. But, I can see where this going and it is going no where. LOL

 

[~JBD RACING~]

A/C DESIGN Your gonna get all you want in Feb .. You better hold on!!

 

[AC Designs]

Now that is funny. At least someone has a sense of humor.

 

[resullivan]

Here are a few more pics. This first one is the car above with the fenders removed. The monokote does not look nearly as good as last year. I don't think I did a good job of keeping it tight. It doesn't look as bad as this picture. Not sure if we are going to redo.

This is what I am calling the test car. Nothing fancy going in this car just to see how it compares to the others.

This is an open car which has razor wheels and needle axles. My idea was to do a see through/invisible car. This is monokote as well.