189 replies to this topic

[tonyp]

Interesting and it should be very light.

[MSwiss]

Akitani,
Nice clean work, but one mild critique.

You went with the heavy duty hinge assembly which is good, but your
body mount tubes only have .250" of solder area.
Having the rest of them exposed probably doesn't help.

I would brace those with something like some .047-.062 piano wire "L's".

[Steve Deiters]

Now that is one imaginative chassis. Simple in design, but well thought out execution. It will be interesting to hear how this one runs.

[j-slot]

Akitani,
Nice clean work, but one mild critique.

You went with the heavy duty hinge assembly which is good, but your
body mount tubes only have .250" of solder area.
Having the rest of them exposed probably doesn't help.

I would brace those with something like some .047-.062 piano wire "L's".

Mike,

Thanks for your advice. I also understand its necessity.
After the test run, I might have to add some reinforcement.

Akitani

[MSwiss]

Maybe "L's" too in the inside corners where the hinge wire is butt-soldered to the edge of the pan.

You started with a very light design so you have plenty of leeway to add weight/bracing.
On the Gerding Kings, the cornering speed is very high and the crashes are that much harder.
You can't make your car too strong.

BTW, what is the weight of the bare chassis as shown?

Also, I'm real impressed with your main rail design. Not a monorail or a two-railer. It's a "rail and a halfer".

[j-slot]

BTW, what is the weight of the bare chassis as shown?

Also, I'm real impressed with your main rail design.
Not a monorail or a 2 railer. It's a "rail and a halfer".

This "rail and a halfer" bare chassis weight is 47g.
Complete car might be about 95g??

[68Caddy]

Way Sano Akitani, love it what is the wheelbase and the guide lead on the car?
Looking forward for the test and other new builds of yours.
I sure hope that you will make it to BPR one of this days with Haruki.


Nesta

[j-slot]

Way Sano Akitani, love it what is the wheelbase and the guide lead on the car?
Looking forward for the test and other new builds of yours.
I sure hope that you will make it to BPR one of this days with Haruki.

Nesta

Nesta,
3.85 wheelbase and 4.75 guide to rear axle. Total weight (include body) is 96g.


I wish I could go to BPR with some Tokyo racers in the near future.

Akitani

[Keith Tanaka]

I wish I could go to BPR with some Tokyo racers in the near future.

Akitani

Akitani-san, outstanding workmanship.
Hopefully someday the Tokyo D3 racers can come to BPR with Haruki. That would be nice to meet the Japanese racers.


Keith

[68Caddy]

I hope that you will make it over here, and I hope that we can make it over to Tokyo and race on your race way one of this days!
After all my girlfriend still have family over there and I always wanted to check out the historical places.
Also your body painting is way sweet and thanks for replying.


Nesta

[usadar]

Hello D3 racers,

Kamosita-san built 5 Porshe 908 Spiders with Hanada chassis for prospective D3 racers here.

4 of them are now sold.

Kamo has just sent me a picture of another set of READY TO RACE D3 Can-Am cars with Hanada chassis.

Ti 22's are different from 908's in that their chassis has thicker motor brackets(.047 against .032) than 908's.

I hope these RTR cars help newly coming D3 racers join our racing program here easily.

Haruki

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[usadar]

Tokyo D3's track is a King Track by Gary Gerding.


This Gerding King, G13, is a very smooth and fast track, loved by racers here.

Japanese weather, however, moves track surface, especially that of the straight.

Gary has given us a very good instruction to adjust the track surface, but sometimes we fails to find bumps at the straight.

D3 F1 cars are open wheel car with no down-force.

Can-Am cars never have a problem at the straight but sometimes F-1 cars de-slot at the bumps, hitting the sides of the bank badly.

When I was practicing for our last Tokyo D3 race, my F-1 car, built by John Gorski, hit the bank side badly, breaking the rear section of the car.

We adjusted the track surface and we had no problem at the straight during the race.

Today I fixed the F-1 car, replacing the rear section of the car by Hanada F-1 motor-bracket and brace pan.

The guide-tongue was also damaged, so I tweaked it to proper position and soldered a brace by Mike Swiss.

I will test the car on Sunday.

Good Racing,

Haruki

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[Tex]

I love those Porsche's!

[j-slot]

Today, we had a practice day for the fourth Tokyo D3 race at CSW.

My new Can-Am car ran pretty good, but Kamo's new ultra lightweight car (only 88.8g!) was much faster than mine.
It clocked under 4.5sec. on Orange lane. Kamoshita-san seems to be aiming for TQ'er again.


Here is Kamo's chassis.





AKITANI

[slotcarone]

That is just AWESOME!!!!!! Very creative design and beautiful workmanship!!!

[Keith Tanaka]

Akitani-san, Kamo-san's lightweight design is very interesting.

Some of the BPR D3 builders have tried very lightweight Can Am cars for the King (typically less than 90 grams). They are light and go fast, but the challenge is making them as driveable as a heavier car and as robust to withstand wall blasts. It's a difficult challenge, but always interesting to see what designs work.

It's great to see the Tokyo D3 racers try different chassis designs. That's what D3 retro scratchbuilding is all about.


Keith

[MSwiss]

Did he try it on Red or Black?

What body does he run?

Also, what may run all alone on the track , may not handle in traffic where
other cars are creating dirty air.

[Tex]

Akitani-san,

First, let me thank you for showing your Can-Am cars; I totally missed seeing the Sunoco and Pennzoil bodies previously!

Next, let me echo Mike's praise of your chassis(s)! I LOVE seeing variety and ingenuity put to good use! Bravo!

[j-slot]

I think my car (96g) is not too light for the KIng track. It has performed good as same as my other over 100g cars.

Kamo-san's 88g car (TSR LolaT160 body) might be hard to drive keeping fast lap time constantly without danger of de-slot on the side lanes.
As Tanaka-san and Swiss-san said, its ability for the race by eight cars is an unknown quantity.

Anyway, our experience of the retro racing is only less than six months.
We are trying and testing anything now.

Thank you very much for your interests, evaluations and useful advices.

This is a draft of my next chassis.....


Akitani

[j-slot]

Here's another new Can-Am chassis for the King track.





Wheel base 3.850"
Guide lead 0.950"
All rails .062" wire
Nose weight and pans .062" brass
Slick 7 retro guide tongue
Hanada .047" motor bracket
Bare chassis weight is 48 grams, complete car will become 97 grams.

Akitani

[miko]

Akitani,

Very, very nice. I love your original designs. Hope to see more!

Miko

[Roger U]

Such interesting designs and beautiful craftsmanship, the chassis' are very nice!

[usadar]

I would like to post some pictures of chassis built by Kamoshita-san.

This is one inspired by Tony P.'s build.


The following is a chassis he built for a BPR racer.






The next is what I asked him to build with Chicagaland Raceway Versa-Bracket.


Akitani-san has been building a lot of new builds, which he will post here soon.

You will find more nice builds by our Tokyo D3 racers at the Tokyo D3 race reports by Keith.

I hope I will post my future build here soon.

Haruki

[MSwiss]

Very nice work.

The one on the bottom is especially interesting.

To take full advantage of the brass plate under the motor as a heat sink, put some sort of heatsinking compound between the motor and the plate.

It's the stuff they use between electronic components and the frame in a full size automobile.

Koford sells it as part #M295.

It's a bit sloppy to use but I think it will be worth the effort.

[usadar]

Hello Mike,

We did not know the brass plate under the motor worked as a heat sink.

Thanks a lot for a good information and instruction.

We like your brass nosepieces and steel braces that Kamo is using for his builds.

Good Racing,

Haruki