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Old 08-30-2012, 06:50 PM   #1
squidger
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Default Any Ideas anyone.

Have just built a Multiplex dogfighter and decided to use the running gear out of an existing model. The existing model is an Edge 540 32 inch wingspan foamy. I have no idea what the esc is rated at so decided to keep everything together as it was flying OK in the edge.

Battery............4s 1800 mah
Motor..............Unknown KV
esc.................Unknown
prop................7x6

Have put it on a meter and it's pulling 30 amps and 450 watts with a 7x6 prop.
I would love to know what this translates to in terms of thrust. The dogfighter weigs in at 750 gramms so it should be ballistic with this setup.

Have tried various 3s set ups but not knowing the esc rating have stuck to max 30 amp loading. Best 3s setup was 30 amps and 320 watts with 8x6 prop.
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Old 08-30-2012, 08:18 PM   #2
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You might try here: http://www.badcock.net/cgi-bin/powertrain/propconst.cgi

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Old 08-30-2012, 08:33 PM   #3
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Originally Posted by squidger View Post
Have just built a Multiplex dogfighter and decided to use the running gear out of an existing model. The existing model is an Edge 540 32 inch wingspan foamy. I have no idea what the esc is rated at so decided to keep everything together as it was flying OK in the edge.

Battery............4s 1800 mah
Motor..............Unknown KV
esc.................Unknown
prop................7x6

Have put it on a meter and it's pulling 30 amps and 450 watts with a 7x6 prop.
I would love to know what this translates to in terms of thrust. The dogfighter weigs in at 750 gramms so it should be ballistic with this setup.

Have tried various 3s set ups but not knowing the esc rating have stuck to max 30 amp loading. Best 3s setup was 30 amps and 320 watts with 8x6 prop.
Also try www.motocalc.com. Free for 30 days, then $39 USA.

If you know the prop RPM, that would be a great help. With motocalc, you can create a "fake" motor that matches the RPM reached with the prop you have tried.

DennyV
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Old 08-30-2012, 10:29 PM   #4
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Heres another one: http://personal.osi.hu/fuzesisz/strc_eng/index.htm

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Old 08-30-2012, 11:25 PM   #5
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Thanks for the inputs. I really need to know the motor KV before I can get any of these calculators to work.
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Old 08-30-2012, 11:30 PM   #6
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Found out it's a 1400 kv motor so that gives a nearly 2:1 thrust to weight ratio and top speed of 120mph. Can't wait for the maiden on Saturday weather permitting.
Also the esc is rated at 35 amps so will try a 9x6 prop when I can get one and hopefully may achieve 400 watts on 3s.
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Old 01-31-2014, 01:18 AM   #7
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squidger, I'm curious to see how this set up worked out. I've had my eye on these and wonder how they are.
Thanks,
Joe
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Old 01-31-2014, 08:34 AM   #8
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Looks like a fun little model. I'm not sure about 120mph top speed? I'm calculating a rough pitch speed of 70-75mph on 3s and 95-100mph on 4s. Top speed in level flight will be a somewhat less. Still fast for a small model though.
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Old 01-31-2014, 08:55 AM   #9
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The set up works well.It's pretty quick but not 120mph. You need to be on the ball at the launch cause it rolls left about 45 degrees when you punch the throttle. Friends have the same model with 3s setup that are just as quick but roll more violently when throttle banged open. If you cruise past straight and level then open throttle wide she banks left about 45 degrees so need to be ready for it. Roll rate is quick with not a lot of aileron movement. She flies like shes on rails. You can slow her down with no problems at all so easy to land.
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