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Post by mike68 on Jan 5, 2013 12:35:41 GMT -6
Jonathan and I started work on his 2013 PW derby car. We went with a thin wedge design. Utilizing the 2.5oz tungsten canopy we milled out a pocket behind the rear axle slot and used tungsten cubes to bring it up to 4.5oz. The wheels and axles bring it up to 5oz. We taped the weight in place to take a few pics. Attachments:
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Post by mike68 on Jan 5, 2013 12:38:45 GMT -6
another pic Attachments:
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Post by mike68 on Jan 5, 2013 12:39:19 GMT -6
and another Attachments:
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Post by mike68 on Jan 5, 2013 12:39:51 GMT -6
last one Attachments:
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Post by Murph on Jan 5, 2013 14:26:00 GMT -6
I like the wedge weight! Looks cool!
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Post by mike68 on Jan 7, 2013 7:56:32 GMT -6
Nearly all of the weight is in the back of the car, should be pretty fast. We also have my daughter Abigails car for the sibling race, hers is similar except no tungsten canopy so we will mill out another pocket forward of the rear axle for more weight. I have 3 cars for the adult derby: My ducted fan car from last year I am going to tweak it a little, a modified car using extended wheel base (3 wheels touching), a 3.5oz tungsten canopy and lead weight (going to weight it around 7oz total) and a stock class car which will be like Abigail's.
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Post by Murph on Jan 7, 2013 22:22:07 GMT -6
Got a picture of your fan car? That would be cool to look at!
Murph
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Post by mike68 on Jan 8, 2013 5:28:56 GMT -6
The fan car is equipped with 2 five volt 3 farad capacitors. When the car is staged and the switch pushed in power is routed from the battery to the capacitors. When the pin drops power is routed from the caps to the fan. Provides max current to the fan and it automatically shuts down at the end of the track when the caps fully discharge. Car ran a best of 2.29 last year. The other car is Jonathans which was fastest in his den with a 3.00. We are working toward a good showing this year. Attachments:
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Post by mike68 on Jan 10, 2013 13:10:35 GMT -6
the weight is epoxied into the pocket, going to wood putty over it and smooth it out. Going to be primed and painted this weekend. Goal is to start work on axles and wheels as well this weekend.
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Post by mike68 on Jan 18, 2013 5:24:58 GMT -6
car was primed and sanded twice with dupli-color sandable primer and shot with dupli-color lacquer. Final preps and assembly this weekend. Pic to follow.
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Post by Murph on Jan 18, 2013 10:24:34 GMT -6
 Looks good and nice work! Thanks! Murph
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Post by mike68 on Jan 20, 2013 13:59:54 GMT -6
had to have flaming cobra on the hood Attachments:
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Post by mike68 on Jan 20, 2013 14:00:36 GMT -6
side view Attachments:
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Post by mike68 on Jan 26, 2013 16:15:33 GMT -6
update on the flaming cobra car. Jonathan won 1st place for the Bear den and in the process his car generated the fastest time in the pack. Average over 3 runs (one in each lane) was 2.91 seconds on a 30ft wooden track. His fastest run was a 2.88. Pictures to follow
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Post by mike68 on Jan 27, 2013 10:31:51 GMT -6
Jonathan with his trophy and certificate Attachments:
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Post by mike68 on Jan 27, 2013 10:35:00 GMT -6
Jonathan and Abigail with their cars and trophies. Abigail won 1st place in the Sibling race, Jonathan 1st in the Bears and overall champ. Attachments:
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Post by renner on Mar 22, 2013 13:45:09 GMT -6
That's great! We ended up with an identical result. Older son won the scout class and younger son won the family class. We also have a three way race-off between the best cub scout, best sibling, and best girl scout. My boys went 1-2 in that as well. I'm a very proud dad! Attachments:
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Post by topspind on Mar 25, 2013 17:31:08 GMT -6
Nicely done! What was the COM on the flaming cobra once you put wheels on it?
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Looks good and nice work!
