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Author Topic: Is Turnigy 3548 700 Good for New Project  (Read 493 times)
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Ministick7
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« on: May 19, 2018, 04:38:23 PM »

Hello,
I bought a 1980's era RC plane. It has a 72" wingspan x 13" chord flat bottom airfoil wing. Usable wing area 6.14 cubic feet. All up weight will be about 5.7 pounds. If my math is correct, that is about 15 ounces per square foot. With that wing loading, will a Turnigy 3548 700 motor and a 3700mAh 4 cell 45C battery be sufficient to easily rise off ground and fly in 10 MPH winds? Thank you. I have the motor, battery and 60 Amp ESC from an earlier project that was never started. (By the way, the plane had 22 sub C NiCad cells and 4 AA NiCads for a receiver pack. If it flew with all that weight and a geared Astro motor...)
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Ministick7
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« Reply #1 on: May 19, 2018, 05:11:46 PM »

Or...do I just keep the geared Astro motor and go with LiPo? Some people online really like these motors. I cannot seem to determine which model this one is. No label. It had 22 NiCads in series for 26.4 volts. Any idea which motor this is? I would like to get specs. on it. It is swinging an 18 x 10 wooden prop. It would be pretty cool to run the old brushed geared motor in this old vintage-looking plane.
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Ministick7
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« Reply #2 on: May 19, 2018, 05:40:12 PM »

It looks like the answer is to keep the geared Astro motor. It looks like it might be a 60 size. Should easily fly this big boy. It has an Astro ESC Model 204. I may have to try that combo. Need a separate receiver battery pack, though.
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Konrad
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« Reply #3 on: May 21, 2018, 10:27:26 AM »

If it helps the Astro 60 had 4 brushes. The model aircraft you describe should make a nice sport model at 450watts (80 watts per pound). Most sport models with the brushed Astro's ran around 20 to 25 amp.  So with 22 cells (26.4 v) x 25 amp = 660 watts you should have a rocket ship by yesterday's standard.

Most of us ran the Astro 60G Sport wind  13T (P/N 662G) on 30 cells when  using the 18X10. If this is an Astro 60G Pattern wind 11T (P/N661G) 22 cells might be a good fit for 18 x 10.

Spec's for the Astro 60 13T motor are Kv=293, Kt 4.27, Ohms 150 mOhms, Io 2 amps.

There is a very slight chance that it is an Astro FAI 60 6T. But I don't think Astro ever sold this with a gearbox.

I think an Astro 40G with a super gearbox  would have more than enough power. Heck, even the Astro 25 will work with the proper selection of gear ratio , prop and cell count.

There is nothing wrong with the high quality Astro brushed motors. Just take the precautions appropriate for brushed motors (timing and spark suppression).

FYI: That 3548-700 looks to be "equivalent" powerwise to a Slimmer 0.32 CID engine. Yes, it has the power to fly your bird.
« Last Edit: May 21, 2018, 11:41:53 AM by Konrad » Logged

Cut it twice and it's still too short!
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