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Calculating Drag

Old 12-03-2005, 11:29 AM
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kkumar
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Default Calculating Drag

Hello all

Where can I find information on wingtip, flap and aileron drag? (how to calculate them based on my wing design) I already have my induced and profile drag... but i need to account for all drag.

Also, my total drag at takeoff (without accounting for the wingtip, flap and aileron losses) is .857 lbs. To overcome this, i'd need a static thrust of well over a pound to take off. The power consumption for the static thrust would be roughly 150-160 lbft/s. I've found motors to supply the horsepower necessary (http://www.gws.com.tw/english/product/MOTOR/MOTOR.HTM) motor name: EM300 and EM350

but i can't find batteries to run the motor at that power (not to mention the servos)

Which scares me becuase my drag number is not complete







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Old 12-03-2005, 11:50 AM
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tonystro
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Default RE: Calculating Drag

ORIGINAL: kkumar
Where can I find information on wingtip, flap and aileron drag? (how to calculate them based on my wing design) I already have my induced and profile drag... but i need to account for all drag.
kkumar,

Probably best to search and/or ask the folks in the Aerodynamics forum! Here is a linke to one thread that might be helpful http://www.rcuniverse.com/forum/m_25...tm.htm#2599369

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Old 12-04-2005, 11:17 AM
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Fastsky
 
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Default RE: Calculating Drag

Generally speaking if you have an idea of what the total weight of the plane will be then its not too hard to find a matching power plant that will haul it down the runway and be able to attain takeoff speed. That is assuming that the plane is designed half decent, ie. reasonable size wing area and control surfaces vs. total weight of the plane, then it will probably be flyable at least. I would think that trying to find a powerplant based soly on drag would be very difficult. If this is your first plane then I suggest you buy your first plane as a kit and at learn to fly it at an RC club. After a 3-4 planes then may be ready to try one of your own designs. [8D]
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Old 12-05-2005, 02:04 PM
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kkumar
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Default RE: Calculating Drag

I posted in the Aerodynamics forums....got a lot of info there.

Fastsky - i intend to do exactly that.

Thanks
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