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Old Jan 25, 2013, 09:36 AM
Vertical approach specialist
potshot's Avatar
Northeastern Illinois
Joined Mar 2009
1,085 Posts
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, 10:30 AM
Frequent Flyer
whitecrest's Avatar
Orleans, MA
Joined Feb 2007
2,071 Posts
Here's a review from 2006. They suggest MPJet 22/7-60D, 7x4 APC slow flyer, 8-amp ESC and a 2S 340mAh lipo.
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Old Jan 25, 2013, 11:00 AM
Registered User
flydiver's Avatar
United States, WA, Seattle
Joined Jan 2007
5,211 Posts
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.
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Old Feb 02, 2013, 10:21 AM
Registered User
Dr Kiwi's Avatar
Chattanooga, Tennessee, United States
Joined May 2003
27,197 Posts
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
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Old Feb 02, 2013, 07:07 PM
Vertical approach specialist
potshot's Avatar
Northeastern Illinois
Joined Mar 2009
1,085 Posts
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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