R/C Combet Test Aircraft Designs  
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R/C Combet Test Aircraft Designs - 4/9/2008 3:39:25 PM   
Yishht87


 

Posts: 87
Joined: 4/5/2008
From: Geneva, SWITZERLAND
Status: offline 		Well, hi.

I think that the airplane will definitely fly. I found a very useful and quite an accurate online aerodynamics calculator on www.RCAdvisor.com . This is a very nice calculator which is meant for electric airplanes- but suites gas airplanes as well. I hope there will soon be an update to the calculator with gas engines . If you want to go there, become a member of the site for FREE and then you can use all the features of that calculator. That calculator counts drag ans lift and their coefficients, and all the other things like zero lift angle, wing loading and all that. So, here is what I came up with:

Airplane Dimensions:

Wingspan total = 147.9 cm

Length total = 123.2

Height total = 31.4 cm w/o rudder

Specifications:


Airplane Efficiency at 100 % Thrust at 60 km/hour:


Wing Loading = 28.464 oz/ft^2

Wing Lift = 2.5 kg

Thrust = 1.468 kg

Wing Reynolds Number = 109.906 k

Total Drag = 0.108 kg

Climb Rate = 320.088 km/hour or 88.913 m/sec


Airfoil Efficiency at 100 % Thrust at 60 km/hour or at .49 % Mach Speed:


Lift Coefficient = 0.404

Drag Coefficient = 0.025

Pressure Drag Coefficient = 0.019

Zero Lift Angle = -2.195


Guys, please tell me is the height of my airplane okay? Because I have small doubts on that if 31 cm will be okay for a 1.5 meter span wing. Will it be okay or should I make it smaller? Keep in mind the airplane will have to fly with a .50 and max .60 gas engine.

Thank you,
Yishht.

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_____________________________

Theory and dynamics is all bullsh*t. You only know it flies when you fly it...
       Post #: 1

RE: R/C Combet Test Aircraft Designs - 4/9/2008 3:54:01 PM   
Montague



Posts: 4606
Joined: 4/19/2002
From: Laurel, MD,
Status: offline 		I think you're putting a lot of effort into building a wood airplane that might get all of 30 seconds of flight time before being totally destroyed. At the very least, you won't survive your first mid-air. Combat is really hard on airframes. Balsa just doesn't hold up.

As for the design, I think your vertical tail is too small to get solid directional stability in a tight turn. I'm also fairly sure that you're not going to turn very well with that airfoil, but that's just based on eyeballing it.


_____________________________

Kirk Montague Adams
RCCA 560

(in reply to Yishht87)
       Post #: 2

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