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Old Jun 05, 2001, 08:43 AM
Registered User
Central NJ
Joined Mar 2001
708 Posts
400 speed Wing surface area/loading ?

These 400 speed motor setups are heavy, especially when you add the battery packs needed to power them.... I tried to put a 400 system on a Walmart foamie plane with 600 mah nicads but it proved alittle too heavy.The Walmart wings are rather slender but I had hoped large enough.The same plane with a 280 speed system is proving to be a better flyer...how do they keep those heavy 400 speed systems in the air ? Is there a minimum wing surface area needed to keep a 400 speed system flying ?
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Old Jun 05, 2001, 09:08 AM
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Quebec, QC, Canada
Joined Mar 2001
104 Posts
Quote:
Originally posted by Feodosia Flyer:
flyer...how do they keep those heavy 400 speed systems in the air ? Is there a minimum wing surface area needed to keep a 400 speed system flying ?
Either by having lots of wing area or by moving it quickly. Stinger 400 pylon racers have only 75sq.in. of wing. Most of the S400 warbirds have 160-180sq.in. Most of the geared, high-wing monoplanes will have 250-300sq.in.

Heavy is a relative term. I've never seen S400 systems as "heavy" but in the _right_ model, I guess they are "heavy."

Cheers --- Larry


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Old Jun 05, 2001, 10:32 AM
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Central NJ
Joined Mar 2001
708 Posts
Ah, ok I think I am beginning to learn something here..I am used to Litestick-type motors and 280 sp setups, so the 400sp and the larger battery pack seemed " heavy " to me...
So if you fly a smaller wing surface then you have to use a high-speed race type engine. My plane has a sort of small wing surface area ( I will measure it again ) and the 400sp was geared...that must have been the problem...when I put a 280 motor in the plane and a lighter battery pack it started to fly. Guess I need to get a large-wing 400 speed plane to fly this geared setup then....hhmmmm another plane purchase looms ominously on the horizon...
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Old Jun 06, 2001, 01:10 AM
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Ste-Therese, Qc, Canada
Joined Mar 2001
69 Posts
FYI, I've seen a nice profile scale model of a Spitfire in recent (less than 12 months ago) issue of Flying Models. The model has about 200 sq. inch wing area and 36" span. It flies with either direct or geared Speed 400 motor. It is designed to be built quickly out of balsa sheets. I plan to build it Real Soon Now (yeah, right)
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