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There is no Fuel tank on that drawing... perhaps it was an early concept before they built any... The truck also looks like a Flexcoil not a HTC like on the production units...
Or a long a$$ worm that hits all 3 axles , and then no idlers needed between the wheels .
... inventive , adaptive , ingenious , clever minds . ...
I think I have a new solution for y'all. Instead of using a cannibalized Kato truck, we can use brand-new gears from existing tooling. I talked to Jason at Rapido and he said the he can supply the delrin gears from any of his models in bulk. In addition, he's also able to get the worms and wheels for me. This is really great! I'm thinking that the flexicoil truck from the FP9 will be a fine starting point, and then I can rearrange the gears to a flexicoil arrangement by changing the gear case dimensions. I can also move the worm down to the very end of the truck and give us some more room for the motor. Motor-wise, I'm not so happy about throwing a gizmoszone motor in here because the worms that I am planning for won't fit those shafts. Making them fit will require an adapter. In addition, the 3V rating of the motor is a problem in my mind. I know you can get around it, but I would rather do it right. I really like the NWSL lineup of motors, and now with the ability to move the worm to any place inside the hood I think there's enough space for a motor that is 10mm on the flats, 12mm diameter, and 20mm long. That's without a gearhead, but the NWSL motors are purpose-made custom motors and from my testing they have a very good speed curve. They use these things on the stanton drives in HO with only a worm. The FP9 also has a compound worm gear, so that should slow things down a bit as well. I can work on making a decoder that will fit in the limited space that we have. I should add one more thing... the minimum quantities for turned stuff (the worm and wheels) is 1000 parts. I don't think this is an issue though... the wheel figure can be divided by six and the parts are probably cheap enough that having stock of worms wouldn't be a huge deal. Could always use them for other projects, and now that I have a source for gears I can make just about anything. This solution will make it so that the Kato stock of SD40-2 trucks doesn't die every time that they are released. David
Not sure if anyone saw this post... looks like everyone took the route of taking apart old stuff for parts. I can continue to develop this if anyone thinks that there would be interest, but if you guys don't see any worth in it I will abandon it.