Dyno for Rc Cars

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mikedealer
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Dyno for Rc Cars

Post by mikedealer »

i remember years ago, readding a rcca car article and someone made or sold or had a dyno, that would measure "rear wheel power" off a car. it basically hooked up the same way a regular car does, onto 2 metal cylinders and the power was measured at the rear wheels. i remember the car having special wheels in the rear to test the power, but it was a very cool thing..

has anybody ever seen one, heard of one or otherwise used one.. i would be interested in something like this.. i have motor dynos, and found them ok.. but i would like to see with the gearing hooked up, how much power is being used/lost

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Re: Dyno for Rc Cars

Post by mrlexan »

The wheel and the lack of traction was the first thing that popped into my mind. I guess you could try to do it with non spiked tires, but the key would be taking as much friction out of the rolling cylinders as you possibility could. I guess you could go with a direct belt or geared system if you were innovative enough and had the math skills. Anything is possible.

Personally, I don't recall seeing anything in the magazines, so I can't help there.
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mikedealer
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Re: Dyno for Rc Cars

Post by mikedealer »

yea i remember them using a special tire (large hard rubber) to test, but it was the same rim, i think they did it on a lunchbox and a onroad car, just to show what it was capable of. im sure it wasnt terribly accurate and thats why we dont see em really.. but thought it was a cool thing

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Re: Dyno for Rc Cars

Post by mrlexan »

It does sound like a cool idea, I would like to see the article myself.
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mikedealer
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Re: Dyno for Rc Cars

Post by mikedealer »

if i had to guess, i would say its a 87-88 issue, probably leaning toward 88 though.. article was on on road racing i think, i really forget.

what i remember was the rolling tubes where lightweight plastic with a metal bar and spacer at the end of tubes, and i think it had a magnet at the end and a sensor that calculated the rotation. i dont remember it being terribly complex, meaning it didnt read throttle curves or anything like that, rather just top end rpm speed, kinda cool

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Re: Dyno for Rc Cars

Post by Bongo Fury »

Hey Mike, I think I saw it too, so I don't think you are dreaming, at least no more than normal. :mrgreen:

Of course the traction is an issue, just like full scale. So you just tie the car down tighter than just gravity I guess, as long as you don't bind anything up. Probably with special hard tires as mentioned. The roller material/coating selection could help.

Not terribly complex to build, except for generating the back torque in the dyno and generating accurate readings. Probably generate torque with a variable load on a slave motor? Would take some $$ for a good load cell and readout device, or possibly a homemade strain gage/bridge set up (calibrated) to get accurate readings. Or adapt a traditional motor dyno perhaps? Certainly need a speed reading or it's essentially useless.

This is kind of down my alley, one of my day job thingies is a significant test lab. If I only had more time and money......course if that was true, I probably would be playing less with TOY cars..... :wink: :mrgreen: On the other hand, at least this way I'm still alive!

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Re: Dyno for Rc Cars

Post by wyldbill »

parms/pse made one strictly for pan cars called the THOR chassis dyno. they were made in 20 amp and 30 amp models and had a pan car axle/tire jig out the back the the test car sat on. i haven't seen one in years sometimes there is one on ebay evry now and then.

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Re: Dyno for Rc Cars

Post by mikedealer »

that was it i believe!

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Re: Dyno for Rc Cars

Post by JK Racing »

I actually used a chassis dyno at the Encino Thunderdrome race (many years ago) when I ran pan cars. It would use the battery in your car, jump it directly to the motor and give you the top end/efficiency you could attain.

Still didnt help me that day....LOL, I finished in the lower 20's overall. :oops: :oops:

It was a really neat set up though.
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fastang
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Re: Dyno for Rc Cars

Post by fastang »

I just found one of the PSE ones at a hobby shop! So what are these things worth? This one is used, no box, no instructions. I asked the guy what he wanted for it and he said $100. He didn't even know what it was so maybe he would go lower. I know its been sitting there for ever. I'm not really interested in it but if one of you wants me to pick it up I will and ship it out to you? Let me know

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Re: Dyno for Rc Cars

Post by marty slater »

i would like to hear more on this also
1 more oldie to bring back into the light
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