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F1, kinda sorta scratchbuilt


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#1 gc4895

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Posted 11 June 2017 - 09:55 AM

At the track I frequent we hold an annual F1 race on the flat track with some pretty simple rules- mainly chassis has to fit under a retro F1 body and 16D or Hawk motor. This year I borrowed the center section of a JK 21 Indy car and went all "retro" around it (see attached).

I wanted to incorporate as many of the design features of the chassis I could, hence the pan I made is limited by the original pan stops at the front of the chassis and the design incorporates the stops at the back by using a "bite bar" set-up. The pan basically rattles like those I put on my Retro F1 cars. The only difficulty was getting all the pieces to fit well since I used .063" brass pans and the steel chassis is .032". Consequently, I had to pay careful attention to making sure the pan would not drop below center chassis height. The brass in the middle is only a weight and is fixed in place. The only major modification I made to the JK 21 was opening up the motor box to drop the Hawk as low as I could. This is geared 9/43 in 72p gears.

I guess the only reason I put this onSslotblog is because it works so darn well! The astute racer will notice I'm employing the new Red Fox guide (thank you, Mike Swiss of Chicagoland!) and yes, I think this really helps. The chassis weighed out at 56 grams bare and with the lead on the front on the track weighs in at 108 grams. It's fun and actually pretty driver friendly, which in my case, is required.

Anyway, I really am enjoying the result of this project. While some strict Retro builders may view this as a "Frankenstein" chassis, I found it an interesting challenge to take the best of flexi and try and meld it together with some Retro technique. As always, YMMV.

 

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  • MSwiss, Tex, Half Fast and 5 others like this
Mark Bauer




#2 Ramcatlarry

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Posted 11 June 2017 - 10:14 AM

Not 'franken' at all. Some rulesets allow 'anthing ' to modify a stamped chassis to compete with a spring steel car. This is what I would encourage as a good "Indy Lights" class. JRL in spring steel has been held back too long as a full open Euro class in 1/24 scale.


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#3 JimF

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Posted 11 June 2017 - 10:59 AM

When is this year's race? And... apparently they allow the American Hawk arm?


Jim Fowler

#4 Samiam

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Posted 11 June 2017 - 11:20 AM

Very innovative use of spare parts. More MacGyver than Frankenstein.


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#5 gc4895

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Posted 11 June 2017 - 12:24 PM

June 18 this year. As for Hawks, Chinese, Japanese, whatever you please.
Mark Bauer

#6 gc4895

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Posted 11 June 2017 - 12:40 PM

Also, about Hawks. After testing both American and Chinese, on the flat track I can't identify any measurable difference. They both are very good performers but this is on a track, for me anyway, that doesn't reward horsepower. My best time ever on this track was with a new JK Mini Brute, hardly a motor I would call high performance. It's about negotiating all those turns rather than straightaway speed.


Mark Bauer

#7 JimF

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Posted 11 June 2017 - 07:51 PM

Drat!... same weekend as our Retro race at Motown.


Jim Fowler

#8 Bill from NH

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Posted 11 June 2017 - 07:54 PM

Mark, 12-15 years ago one west coast track, maybe Vallejo, had an annual F1 race where a flexi center section, usually a Champion Turbo-Fflex, was used with handmade brass pans. These were the days before JK and Champion F1 pans were available. I forget what motor they ran. Your JK chassis above reminds me of an updated version of these cars. Darryl Vance was one individual involved back then.


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#9 gotboostedvr6

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Posted 11 June 2017 - 08:37 PM

Mark,

That's badass, bro.

Did you do any laps with a 16D in it? An FX can should fit.

The extra weight of the 16D might be of use...

Dave


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#10 MSwiss

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Posted 11 June 2017 - 10:59 PM

Very nice.

The minimotors make an affordable, anglewinder F1, very doable.

Tony P always says the ones, back in the day, were duds, but I bet the pictured one, and 100% scratchbuilt ones, will work great.

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