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Old Feb 01, 2003, 02:37 AM
omega blood is offline
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Will work for planes
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Motor test stand.


Here is my motor test stand that I just finished building. It's made of plastic has a current and voltage meter built in to it and scale on top that's removable. 'Gator clips attach to the motor and read the vitals. An adjustable clamp on top holds the motor and will accommodate a variety of sizes. Here are some pics of it.
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Old Feb 01, 2003, 02:39 AM
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here's another.
Old Feb 01, 2003, 02:40 AM
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Last one.
Old Feb 01, 2003, 07:20 PM
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Test Stand


My test stand is an Astro Whatt meter and a clamp to hold the motor to my bench. Works 100%. Tex.
Old Feb 02, 2003, 12:38 PM
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Re: Test Stand


Hi

If you want to make a PC controlled motor tester, you can find a good construction in some of the latest issue af german magazine: Elektro Modell, or at:http://www.dero-modelltechnik.de look in "dokus"

Soren
Old Feb 02, 2003, 06:55 PM
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Got helium filled wings?

a capitol idea


that is a wonderful stand that does more tests than a clamp on the edge of the table
you are sure the thrust is accurate when transfered to the scale?
simple yet adaptable...I like it
when may we purchase plans as imitation is the best form of flattery
can the motor pedestal be adapted for pusher props?
smart work
thanx
allen
Old Feb 02, 2003, 09:01 PM
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Re: a capitol idea


Thanks Air boss,
Quote:
Originally posted by airboss

you are sure the thrust is accurate when transfered to the scale?
simple yet adaptable...I like it
allen
No, but it gives me an idea at to the thrust. 1 It's a chep $3 scale. 2 I'm sure the long arm gives it more leverage. It could probably be modified to use a fish scale ,but I've seem plenty stands that are similar.
The clamp can take a motor on either side so yes it will take pushers.
As far as plans you dond't need any. It's very simple. I built it from stuff I had laying around. But I'm sure it can be buit from 30-40 dollars at the most.
I can give you more details, pics, and info on how to build one if you are interested in making one.


Thanks for the link Soren. Makes me wish I took german in high school.
Last edited by omega blood; Feb 02, 2003 at 09:23 PM.
Old Feb 03, 2003, 03:01 PM
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Re: Re: a capitol idea


Quote:
Originally posted by omega blood
Makes me wish I took german in high school.
You and me both. I mean, "Si, mi tambien!"
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Old Feb 03, 2003, 10:23 PM
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Got helium filled wings?

thrust scale


hope you could send one more picture?
would like to see top view of motor clamp
that's all as rest can be copied from great set of pictures
think i will use fish scale on mine to set up chart for thrust comparisons
ish spreche nein deutsch bitte
thanx
allen
Old Feb 04, 2003, 09:19 AM
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Once you've discovered the static thrust of a settup, what do you do with it?

You can have tons of static thrust that won't fly an airplane, and vice versa. Tex.
Old Feb 04, 2003, 02:39 PM
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Saberjock, it's information for use, future use and compirason against other planes.

Here's the pics airboss.
Old Feb 04, 2003, 02:40 PM
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here's one more.
Old Feb 05, 2003, 12:36 PM
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Omega: I am truly curious as to what use you can make of the information. I wasn't trying to belittle the endeavour. It's just that determining the static thrust has never produced anything meaningful to me.

For some, gathering data can become a pastime in itself. If there is some correlation between a static measurement and flight performance (other than perhaps determining an ability to hover) I'd sure like to learn it. Tex.
Old Feb 05, 2003, 10:01 PM
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A static test is not completely useless. It can be thought of as an inexpensive dynamometer. So, for the same prop and gearing two different motors can be compared to see which is doing more work. If one puts out more thrust static, it will also put out more thrust dynamic if everything else is constant.

I have a test stand for micro setups. It pivots on 2mm id ball bearings. BTW, if your arms are unequal in length, take the ratio of the lengths of the two arms and multiply your measured thrust by that.

I also have a wind tunnel. With this I can evaluate similar CF props that I have molded. One is more flexible. The advantage of the stiffer one comes through in the static test, and is also verified at a number of different wind speeds in the dynamic tests. The relationship is in the same direction, but the dynamic test gives me the slope of that relationship.

The purpose of any test is to draw conclusions. For the right type of problem a static test can allow you draw conclusions and make a decision. If a wind tunnel doesn't cause you to reach a different conclusion, then for that test it didn't make any difference (but it would be nice to know that in advance).

For some collecting data, or reaching conclusions is half (or more) of the fun. Others build CNC cutters etc. Sometimes the journey is also what is enjoyable.

Gordon
Last edited by Gordon Johnson; Feb 05, 2003 at 10:08 PM.
Old Feb 05, 2003, 10:19 PM
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Got helium filled wings?

how long will it fly


i just compare props and motors to figure out which combo uses more watts or produces more thrust
take a 400 can and put 9x5 dd, then 9x6, and so on
tells me when i reach limit of motor
a few times i have used static to test lubricants by running motor stock then adding lithium to bearings and write down change
then used polymer additive, etc.
now have longest lasting brush motors
have secret sauce that runs super hot or freezing cold and could not have determined without static tests
static is good to give idea of running conditions but not without limits
static is good to figure out flight times for altitude flyers
set timer to static test's limit and when it goes off bring that baby down before you lose control
do you know how long your setup will run to the minute
with static test i know {and have fudge factor from dynamic flight time difference}
enjoy
allen


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