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Old Jan 25, 2013, 10:36 AM
potshot is online now
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Vertical approach specialist
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Help!

Motor substitution advice needed


I came across an old Cobweb airframe that was popular in the 2005-7 time frame.There are no electronics, servos or motor. The bare airframe weighs only 68 grams with control rods. I need to select a motor for it.

According to an old thread, owners used these motors: Hacker A20-50S, LensRC 22.7mm 17T and Python 30. The Hacker is 29g but I can only get sketchy info on the others. It appears that a BW 1300 KV might be a good one to try. I also have 15, 17 and 19 gram motors on hand. For power I'm thinking maybe 2S 400-500.

Anybody care to advise or comment?
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Old Jan 25, 2013, 11:30 AM
whitecrest is offline
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Here's a review from 2006. They suggest MPJet 22/7-60D, 7x4 APC slow flyer, 8-amp ESC and a 2S 340mAh lipo.
Old Jan 25, 2013, 12:00 PM
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Go REALLY light if you can. Too much weight and the wings POP on you.
It's quite fragile, almost completely an indoor sort of plane.
Old Feb 02, 2013, 11:21 AM
Dr Kiwi is offline
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Motrolfly 2203-1600 v2 (18g, ~1645Kv) would be good with a 7x4 APC SF.. just 4.50A (33W, 215g thrust @ 29mph).

http://www.subsonicplanes.com/Motrolfly_Motors.html
Old Feb 02, 2013, 08:07 PM
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Thanks, Dr. Kiwi. That looks like a nice unit. I appreciate the suggestion.

I have already installed a 1300 KV BW and am going to maiden it tonight in a golf dome. The BW balanced it nicely; the battery is just a touch forward of the CG, so I'm hoping for an uneventful maiden.


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