Dynos that actually measure torque?
 

What dynos have been made that actually measure toque? It seems most motor checking equipment (even those that call themselves a dyno) only measure things like amp draw, rpm, and the like.

I believe the tekin dyno like that pictured below measures torque but are there others?

http://www.rctech.net/forum/attachme...o-000_0674.jpg

Re: Dynos that actually measure torque?
 

It's a load dyno...the tekin wasn't very good, but some people could tune with it.

A dyno that measures torque needs a torque sensor. Very few had em, mainly the turbo dyno...all the others just use complex formulas to determine the torque using the things they can measure (rpm,amp draw, etc).

The turbo dyno isn't perfect though, most 30t and higher motors can trip the torque sensor max with ease.

Later EddieO

Dynos that actually measure torque?
 

There is the Fantom Dyno Facts Machine, but they're hard to come by and generally expensive when you find them.

Re: Dynos that actually measure torque?
 

Fantoms are easy to find. You can typically find them on eBay for $100 or less, hobbytalk and rctech pften see them for around $100 every so often. Fantom made a lot of them, so there plenty out there to be had. It's a flywheel style dyno So the torque is measured by formulas not by a sensor.

Later EddieO

Re: Dynos that actually measure torque?
 

Hmmm, I haven't fired up TEDROCKZ's Turbo Dyno in a while. Fun stuff. Sounds cool. But yeah all my 35 turns hit the max of 15.9

So what's the best dyno for crawler motors?

Re: Dynos that actually measure torque?
 

Your truck:)

I use a combo of all of them to test what I need.

I've been working on a custom unit but finding machinist time to get parts made isn't easy.
Later EddieO

I had no idea Fantoms were so common. Last time I looked, they were much less so. It's been quite a while.

Re: Dynos that actually measure torque?
 

Sadly, my truck doesn't have a printer port.

Re: Dynos that actually measure torque?
 

Blah. Drive the thing. Can't tell? Isn't better. Eventually you come across something that is best. Like the Axle Buster in my Losi. Ridiculously better than anything else brushed in the thing. Better for your application? Not necessarily.

Re: Dynos that actually measure torque?
 

Strap to full size mustang dyno :lmao:

Re: Dynos that actually measure torque?
 

What do you need a printer port? :)

But there is a way to dyno in the truck and print it....

Later EddieO

Re: Dynos that actually measure torque?
 

Customers might like to have something more than "it's awesome, trust me!"

Chassis dyno? Data logger?

Re: Dynos that actually measure torque?
 

I have not sent out a dyno sheet with a crawler motor since 2008....

A data logger would function as a in truck dyno pretty much....

Later EddieO

Re: Dynos that actually measure torque?
 

Maybe the data logger is the best way for me to go. I have wanted an Eagle Tree for a while anyway for my planes. I could build a jig to hold a motor with a brake/flywheel for out of the truck testing besides being able to use it in the truck.

Re: Dynos that actually measure torque?
 

You'll find that even if you provide the data, most either don't care or don't know what it means. On top of that, you will find that the things people really wanna know like start up and drag brake are not really measurable without making up some test that again very few people would understand and would have no comparison from other brands of motors.

Later EddieO

Re: Dynos that actually measure torque?
 

It should be no sweat to make a dyno to measure static torque (only).
- Something like a servo arm fitted on the motor axle.
- Some scale or similar to measure the force applied by that arm at a know distance from the axle centre.
- A voltmeter.
- An amperemeter.
- A regulated power feed.

This way the stall torque can be measured, as well as the no load voltage and current.
Any other torque value can be intrapolated from there.

Re: Dynos that actually measure torque?
 

There is more to it than providing customers with data I guess. As I make revisions to my design I see it being very helpful to have comparative evidence. If one revision is only slightly better it might not be obvious which revision is better or it might not be obvious to me that although two revisions feel the same one might use more wattage to accomplish the same performance. I want to make sure my customers are getting the best product I can possibly provide. I have a bunch of motors from various manufactures so comparative data would be possible there as well. In addition to my products my wife wants to start winding armatures so she will want data to help her hone her technique.

Re: Dynos that actually measure torque?
 

If you are feeling froggy, I have a full dyno brain with display available. You would need a load cell with op amp, power supply, two ESCs, and a slave motor. It can be ran in voltage or amperage mode, amp limit is 100 , voltage limit is 150.


Your wife is in far a long journey! Winding is the most difficult part to jump into, it takes more practice than all the rest. I only wind 20 to 30 a week myself and its barely enough to keep the skills sharp.

Re: Dynos that actually measure torque?
 

John,
I just replied to your last email and added some questions about the dyno. Thanks again for all the help.

My wife seems really excited about winding and I believe she will be fairly good at it after a while. Certainly better than I would ever be. I'll keep doing cad work/machining and let her do that stuff!