Replies to This Discussion

Permalink Reply by Chris McNair on November 10, 2010 at 8:28pm

Nice looking rendering! What program are you using?

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Permalink Reply by William Gross on November 10, 2010 at 8:32pm

Thanks alot, I built it in Rhino and rendered in Keyshot2

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Permalink Reply by Hamish on November 12, 2010 at 1:29pm

yeah if you're getting it laser cut go for the wortman, its lovely

generally, the more cambered (curved) the aerofoil, the more lift its going to produce but at the cost of more drag.
And a thicker aerofoil will generally stall gently and at a higher angle of attack than a thin one.
I dont know, I guess people get paid good salaries to refine these things so choosing the perfect aerofoil is probably beyond the scope of anyone here lul

and as for the elevators or ailerons question, what do you mean ? you definitley need elevators and probably want ailerons for this plane

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Permalink Reply by Joel on November 12, 2010 at 6:06pm

I'm building a wing ATM. I was planning on only ailerons(its a flying wing). Why would I also need elevators? Seems like with a flying wing since there is no tail that ailerons would suffice.

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Permalink Reply by Hamish on November 12, 2010 at 6:21pm

true, this guys not making a flying wing tho :3

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Permalink Reply by Joel on November 12, 2010 at 6:25pm

Oh, sorry, was looking at most of his pictures which look like a flying wing. Now i see that he is planning more.

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Permalink Reply by Hamish on November 12, 2010 at 5:27pm

hey why don't you tell me the max. weight, desired stall speed (or landing speed) and desired cruise speed and i'll see what i can come up with.

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Permalink Reply by William Gross on November 12, 2010 at 6:32pm

Im hoping for this plane to be about 25 Oz. and be capable of carrying a 7 cell lipo as well as the ardupilot components inside. Speed does not need to be very high as I want this to be a slow, loiter capable vehicle that can stay up as long as possible.

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Permalink Reply by bGatti on November 12, 2010 at 6:35pm

Then you want a glider with long wings, and essentially flat lower wing etc...

There are two options, High ground cover (ie to photograph as much area as possible) , or loiter.
Small and long wings respectively.

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Permalink Reply by Hamish on November 14, 2010 at 7:27am

okay for a 25 oz plane with a stall speed of 10 MPH (pretty slow) i came up with

for a wortman fx 60-126 wingspan 80in average chord 6.6in (area=530in^2)

at a guestimated 40 mph max speed, this wing will have a turning radius of 7.1ft lol, i dont know how long it would sustain that though!

the wing's pretty huge but then again the stall speed is small too, for a 15 mph stall, same airfoil
span = 58in average chord = 4.8in (area=279in^2)

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Permalink Reply by William Gross on November 14, 2010 at 9:59pm

Thanks a ton for your help Hamish. Ill take those numbers and see what I can put together, Ill let you know what I come up with.

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Permalink Reply by wayne garris on November 17, 2010 at 1:29pm

@ william
I use XFLR5 , freeware CFD ! works great for me . a word of warning for the FX 60-126 . it has a high moment coefficient ( Cm ) = -0.144 . in plain terms it will create a forward pitching force that will increase with speed . this must be counteracted with a properly designed tail .

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