Deleted
Deleted Member
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Post by Deleted on Sept 13, 2014 8:14:22 GMT -7
what length shutdown are folks using?
anything special like "dynamic braking" or reverse polarity braking?
steel bar stock in place of the rails?
personally I use steel bar stock as my complete shut down with a space between the bars that serves as a slot.
my powered section of track is 12 feet (with 10' 3.75" timed) and the shut down is 6 feet.
I am thinking of shunting (dynamic braking) or reverse low voltage polarity which I have used on other tracks i have built and sold.
short shut downs make me worry a bit about very fast cars.
they are a tad more expensive and cannot take the beating a Matchbox can.
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Post by dave632 on Sept 13, 2014 8:35:57 GMT -7
My current shut down is about 3' with lots of cushioning. It stops cars OK that have run as quick as .394 for the 15' 2". I like your idea of using bar stock as it seems the magnetic drag would quickly stop the cars. Dynamic braking and or LV reverse polarity would work too but I think the bar stock is the best idea. I think I will experiment with the dynamic braking and the LV reverse polarity however.
My worst accident so far was one car that left the slot jumped over the 4" retaining wall and hit the ground. Outside of the body coming off it sustained no damage.
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JW
Pro Stock
you can follow my YouTube channel @jwmoor
Posts: 168
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Post by JW on Sept 13, 2014 11:25:14 GMT -7
Mine is 20.7' timed with 5.9' (26' overall) and I tried everything from neo's under the track between the slot to pillows but found airbags work the best. Ya real simple, just take 3 or 4 plastic grocery bags put one inside the other, slip the combined bags over the end of the track and attach with elastic on both sides. Sounds silly but works great even when i crank the voltage to way over 26v. lol
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Deleted
Deleted Member
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Post by Deleted on Sept 13, 2014 12:19:15 GMT -7
Took my airbag system just a little further. Plastic trash bag inserted into a pillow case. Open end of bag and pillow case is attached to a small piece of plywood. Cut 6" dia hole in plywood to mount a 6" muffin fan from a PC. Nice and quiet. Fan is a 12vdc will I have connected to a variable power supply. This allows me to adjust the airflow and therefore control the pressure into the bags.
Alan @ R&D Racing
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shut down
Sept 13, 2014 14:07:41 GMT -7
via mobile
Post by pceng on Sept 13, 2014 14:07:41 GMT -7
My current shut down is about 3' with lots of cushioning. It stops cars OK that have run as quick as .394 for the 15' 2". I like your idea of using bar stock as it seems the magnetic drag would quickly stop the cars. Dynamic braking and or LV reverse polarity would work too but I think the bar stock is the best idea. I think I will experiment with the dynamic braking and the LV reverse polarity however. My worst accident so far was one car that left the slot jumped over the 4" retaining wall and hit the ground. Outside of the body coming off it sustained no damage. DAVE ! DAVE ! DAVE ! ............... .394 ! holding out on us there, slick......... lol. Hope that was a MM/PS for next season......... just say yes........ it will drive some crazy. Lol....... Peter |
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Post by dave632 on Sept 13, 2014 17:25:20 GMT -7
Yes it was a MMPS but with a lexan body. I put a 55 Chevy body on it and it slowed down roughly .01-.02 None of my 4 gears could come near that even running at 50 volts. That is one of the cars I will run next season. I will guarantee as I gain experience I will be more competitive. Just purchased the TM3000HO timing system so I can see the times at different locations on the track. Here is the car that ran that number. I am not much of a fan of lexan bodies but I did just order a modern Camaro and 55 Chevy body made out of lexan.  |
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