How to do a thin car/ balsa fill

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sporty
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How to do a thin car/ balsa fill

Post by sporty » Sun Nov 09, 2014 2:00 pm

I cant recall, when the last time I seen someone post how they do it.

Adding balsa into a super thin, hollowed out car.


using a pinewood derby block from the official kit ! and a dremel and a cutter disk.


While I am not very good at good try cuts with a dremel and I no longer own a scroll saw.


here ya go.

I took a full block and marked out, where I wanted it cut out. I did not cut the block to 1/4 thick yet.

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I did drill the axle holes, before cutting out the bottom of the wood.


However. I just cut the block to 1/4 thick

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I had to go back and dremel a bit more.

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1/4 thick balsa.

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the sides of the frame are 1/8th thick.

I used elmers glue and some super glue gel. Once dry I will start removing some of the balsa.

Out of time for now.

Sporty



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sporty
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Re: How to do a thin car/ balsa fill

Post by sporty » Tue Nov 11, 2014 8:54 pm

I need a smaller hole saw, but it worked, but one piece looks a little ruff.

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adding on some balsa fenders.

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Its only your imagination and your kids, that can limit to what you build.

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Sporty



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sporty
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Re: How to do a thin car/ balsa fill and picture of a car !

Post by sporty » Tue Nov 11, 2014 9:02 pm

It might not be as fancy, but if you cant afford to buy a thin framed car with balsa or rules do not allow you to buy that, but you can still use a bsa kit and buy some 1/4 thick balsa to do it.

Don't worry about being as fancy or pretty as a store bought one, nothing says pride, when its your own work !.

And in the end. it can still look great.

Some r/c monokote covering. r.c small iron with sock needed to bond monokote.

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Flat top with 1/2 fender / sides. Does not have the fancy 1/2 shaped cut out by the wheels, but still not bad in the end.

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Sporty



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Re: How to do a thin car/ balsa fill

Post by whodathunkit » Tue Nov 11, 2014 10:36 pm

Neat car there Sporty!

And keep posting the tips on how to apply the monkote covering will you!
Been thinking about useing the monkote on some more builds & I could use some more
good tips & pointers though.


What type of automobile can be spelled the same forwards & backwards?

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Re: How to do a thin car/ balsa fill

Post by LightninBoy » Tue Nov 11, 2014 11:15 pm

NICE!!!

That's exactly how I do my balsa fills in that I fill the void completely with balsa then cut out (with a scroll saw in my case) the balsa in the shape that I want.

BTW - I recommend a covering up those balsa holes on the bottom side too with monokote, packing tape, or whatever.



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sporty
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Re: How to do a thin car/ balsa fill

Post by sporty » Wed Nov 12, 2014 1:00 am

LightninBoy wrote:NICE!!!

That's exactly how I do my balsa fills in that I fill the void completely with balsa then cut out (with a scroll saw in my case) the balsa in the shape that I want.

BTW - I recommend a covering up those balsa holes on the bottom side too with monokote, packing tape, or whatever.
I already used white monokote on the bottom forgot to get a pic.



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sporty
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Re: How to do a thin car/ balsa fill

Post by sporty » Wed Nov 12, 2014 1:01 am

whodathunkit wrote:Neat car there Sporty!

And keep posting the tips on how to apply the monkote covering will you!
Been thinking about useing the monkote on some more builds & I could use some more
good tips & pointers though.
I had a good tip one years ago. Lost on here somewhere.



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Re: How to do a thin car/ balsa fill

Post by Laserman » Thu Nov 13, 2014 11:02 am

Lowrider!
That looks awesome!
I bet it is quick too!



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Re: How to do a thin car/ balsa fill

Post by Vitamin K » Thu Nov 13, 2014 1:07 pm

This is really a great way to get a light body that's rigid and crush-resistant. I bet if you paint the inner balsa with CA glue you'll get even better strength.



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Re: How to do a thin car/ balsa fill

Post by Noskills » Fri Nov 21, 2014 2:27 pm

I have been making a few cars just like this with the exception that I do not fill the hollow car with balsa but I but a balsa top on it. (1/16th I think). I also slant the front down and put a separate piece of balsa on that (wood putty in the groove between the pieces). I coat the whole thing in CA glue, sand and prime. Thats how i did this one and it was our fastest to date. I hope to take this style car (stock wheel base in the example), bring the wheelbase to 5 inches, add some fenders and pick up some speed. (Thats my plan for my scout car-have yet to ask my son what he wants to do)

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Re: How to do a thin car/ balsa fill

Post by roosclan » Thu Jan 29, 2015 5:44 pm

Interesting idea to fill it with balsa. I use my scroll saw to cut out the frame, but we then cover the top and bottom with 1/64" or 1/32" birch plywood from a hobby store. I prefer the 1/64" for weight saving and ground clearance. We leave the body hollow except for the tungsten cubes. Been doing it this way for almost 5 years. This year we used 1/32" basswood, but I don't like how flimsy it is. The cars didn't seem to flex much, but the 1/64" plywood is sturdier even though it's thinner (I just can't find it anywhere within a reasonable drive). Here are the boys' cars from 2010:
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Re: How to do a thin car/ balsa fill

Post by whodathunkit » Thu Jan 29, 2015 6:20 pm

Neat looking cars roosclan!
Is the braceing rod metal or something?


What type of automobile can be spelled the same forwards & backwards?

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Re: How to do a thin car/ balsa fill

Post by roosclan » Thu Jan 29, 2015 9:14 pm

whodathunkit wrote:Neat looking cars roosclan!
Is the braceing rod metal or something?
carbon fiber bar. Since then, I leave the wood connecting the front axles (since the rules say the wheelbase must not change and all 4 wheels have to be on) so I don't need the bar.


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Re: How to do a thin car/ balsa fill

Post by Scrollsawer » Thu Jan 29, 2015 9:19 pm

I remember seeing these pics. on DT from a couple years back. If I recall, it's some type of rigid, lightweight supporting rod.

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Re: How to do a thin car/ balsa fill

Post by sporty » Thu Jan 29, 2015 9:33 pm

Carbon fiber rod.



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