Hey Carmatic, welcome to the discussion!
This will take me a while to digest.
But I am VERY interested in your ability to invent new solutions in the realm of gearing. You see, I have a "holy grail of gearing" problem in front of me, which I have still not solved. So prepare yourself to be recruited! :lol:
Continuously Variable Transmissions intended for bicycles... we have. NuVinci, by Fallbrook Technologies. 0.5 underdrive to 1.75 overdrive. I'm running two of them IN SERIES on one of my Kinetic Kontraptions.
To be continued.
motskyroonmatick wrote:Wow Carmatic!
When you bring a vehicle to the playa-- I definitely want to check it out.
Now you have me thinking about making the pedal powered golf cart I am working on dual powered. --WIND--
BTW I recently drained the gear oil out of my club car transaxle replacing it with 5-30 motor oil to reduce oil drag. I noticed no improvement but hopefully in ways that are not measurable by feel there is an over all improvement.
Now on to looking for vertical axis turbine designs for inspiration. :)
Tiahaar wrote:Impressive transmission Carmatic! And welcome from me to the boards also! Yes I agree with Elliot, this looks like a novel way to get differential steering, that is varying the amount of power by some means that is diverted to each side of the drive wheels/tracks. Are you planning a vehicle build? Keep us posted here!
As a side, the former TerraKrawler is about to loose its tandem pedaller attachment (going to a new KSR project). I still think that it is a workable machine, just needs more horsepower...like say a donor 12horse riding mower engine? Heaven knows the 2080 chain could take the output!
Carmatic, I think I got so far as to understand that you are trying to improve on what-I-seem-to-remember-we-called the Bob Durst steering system. The magenta gear on the left side would correspond to Bob's figure-8 chain -- reversing the direction of that side's motion.
But this brings us to the other engineering challenge I mentioned earlier. What I really need is a transmission with a range closer to 2000 (two thousand) percent, and light and cheap. I'm thinking chain gang. I have one now, four gears and plenty range, but I have to stop and remove one chain and install a different chain in order to change gears.
Gemini -- it's 6:30 AM. I ought to go back to bed!
Elliot wrote:Thanks, Carmatic, I'll try again. But I may never grasp this.
ibdave wrote:My Head Hurts now...
dragonfly Jafe wrote:A person powered tracked vehicle can work (BioTrak was a partial success).
If I had cut all the overhead superstructure for the turret and the turret (with flame system) it would have been 30-50% lighter. A bigger torque arm was needed for steering (or more gear inches) - my original design of a 3-person crank (with 4 hand-holds) would have been much better (abandoned due to time constraints). The biggest issue was not bringing certain key track suspension parts, which allowed the track to wander in turns resulting in de-tracking. A more vigorous track alignment system (rather than just relying on the road wheels) would have helped.
I still have all the parts - BioTrak may yet roam the Playa!
I've thought about pedal pwered tracks. Can you gear each track? A skid steer would seem a bit much for such little horsepower.
Oldguy wrote:I remember driving a M113 armored personell carrier in the army, where each track not only had its own accelerator but its own brake. We could also stop the machine, put one track in reverse: and then accelerate in a spin in the same spot. A nice tactic if you didn't want to be shot in the ass, where the personell door was. The crew could bail out the top from their own hatches, and passengers out the door.
We could steer while moving forward by speeding up one track or braking the other, or use a combination of both speeding and braking. We could also put up a lot of dust similar in effect to smoke, in dry soil.
Perhaps separate gearing and braking for each track might be possible in a chain driven vehicle. Or use pinion(?) gears and solid drive shafts like the old BMW desert rat bikes. Just brain storming here... Ever see a paddle boat with separate pedals for each side with a lever to switch to one rower or two? Think tracks instead of two paddle wheels.
Wikipedia wrote:Sun: The central gear
Planet carrier: Holds one or more peripheral planet gears, of the same size, meshed with the sun gear
Annulus: An outer ring with inward-facing teeth that mesh with the planet gear or gears
TomServo wrote:Why did they make tanks so difficult? You for hire, when I hit the lotto?
carmatic wrote:TomServo wrote:Why did they make tanks so difficult? You for hire, when I hit the lotto?
as i understand it, Oldguy drove an armoured personnel carrier, not a tank.. but maybe the skills are transferrable?
TomServo wrote:With a revolving turret, its a tank. Armored Personell Vehicle is almost the same. Same propulsion. Tank is just a prettier name. Artistry in excess
carmatic wrote:...steering can be made easier if your vehicle is wider
carmatic wrote:TomServo wrote:With a revolving turret, its a tank. Armored Personell Vehicle is almost the same. Same propulsion. Tank is just a prettier name. Artistry in excess
the thing is, just like a license to drive a car isnt a license to drive an 18 wheeler, a tank might require different training than an APC... the devil is in the details, see... the control layout might be different, there are different things you can and cant do, different procedures an equivalent manuever ...
theCryptofishist wrote:ibdave wrote:My Head Hurts now...
Mine, too. I don't know why I open this thread.
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