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Old Apr 02, 2012, 08:07 PM
kingkyle is offline
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Whats wrong with my thrust setup


Before everyone laughs I know the scale is too big, but I did some calibration tests and it reads very accurately from .25lb up to 10lbs with weight tests.

My ARC 36-65-1 with a Wemo fan and a CC 125 lite, TGY 2200 30-40c only made 4.2lbs of thrust @ 92 Amps and 1900 Watts.... is this close? I ran this setup in my Mirage and it was moving pretty well. Is the setup totally wrong to get a rough idea?



THanks!
Kyle
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Old Apr 02, 2012, 08:20 PM
scatsob is offline
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The fan is probably a little close to the scale and is there an intake lip on it? If not that will affect thrust quite a bit.
Old Apr 02, 2012, 08:46 PM
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Originally Posted by scatsob View Post
the fan is probably a little close to the scale and is there an intake lip on it? If not that will affect thrust quite a bit.
+1...

make base bigger and move further away from scale deck
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Old Apr 02, 2012, 10:13 PM
tom bacsanyi is offline
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Yes, move the fan up around 4 inches or more from the scale and add the wemo inlet lip. Glue or tape the lip in place because it will try to go foreward and then double back and be digested by the fan. Don't ask me how I know.
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Old Apr 03, 2012, 06:59 AM
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A couple things I would suggest is change your connectors to at least 5.5mm on the batt and 4mm on motor. Use heat shrink not electrical tape. Don't plan on accurate readings using 12 gauge on a meter and 10 gauge on everything else. A 2200 40c ain't gonna make it, your over the output at 92amps when your batt is barely good for 88 amps, you'll burn the battery.
Old Apr 03, 2012, 10:26 AM
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Quote:
Originally Posted by ApexAero View Post
A couple things I would suggest is change your connectors to at least 5.5mm on the batt and 4mm on motor. Use heat shrink not electrical tape. Don't plan on accurate readings using 12 gauge on a meter and 10 gauge on everything else. A 2200 40c ain't gonna make it, your over the output at 92amps when your batt is barely good for 88 amps, you'll burn the battery.
wow, I've been thinking about the gauge wires. Do I cut the 4mm males off my ARC motor and then solder 5.5's on ?

ALso please explain the battery situation. how do you know what amps a battery can produce? Do I need a larger capacity pack? I tried running the same test with a larger 3000mah skylipo 6s 40c and got the same results.

Thanks guys!
Last edited by kingkyle; Apr 03, 2012 at 10:38 AM.
Old Apr 03, 2012, 11:16 AM
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Originally Posted by kingkyle View Post
ALso please explain the battery situation. how do you know what amps a battery can produce? Do I need a larger capacity pack? I tried running the same test with a larger 3000mah skylipo 6s 40c and got the same results.

Thanks guys!
Check the C rating of a battery before you buy. These are often exaggerated or flat out misrepresented, but it's a good place to start. The current a pack can deliver is the C rating multiplied by its capacity.

To use your Skylipo as an example, it is a 3000mAh 40C battery. Multiply 40C times 3000mAh (3Ah) is 40x3 = 120A. This is generally considered max continuous, you can peak over for short periods of a few seconds.
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Old Apr 03, 2012, 11:17 AM
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Originally Posted by kingkyle View Post
wow, I've been thinking about the gauge wires. Do I cut the 4mm males off my ARC motor and then solder 5.5's on ?
That would work fine, just do one at a time so you don't cause a short!
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Old Apr 03, 2012, 03:33 PM
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Thanks for all the help everyone! added the lip "with tape" and also moved the fan up 2 more inches... its now 5" from the scale. Plus I forgot that I didnt have the spinner cone on, so I added that. Jumped up to 6.8lbs of thrust and 6.6 sustained! Now i'm going to change over all my wire to 10guage and all connectors to 5.5
Old Apr 04, 2012, 07:53 AM
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Kyle, the motor wires would be OK with the 4mm connectors but I'd look into the battery connectors. Should you change the motor connectors then simply un solder the pins, don't cut them off. The varnish insulation is baked on the wire and difficult to clean correctly.


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