wanting to build a werid looking ariplane ( need some info)

[extremeflying]

im thinking of building an airplane that will look just like a flying triangle but with the flat side being the nose of the airplane
i need some info on the flat wing with no curves . will airplanes fly with flat wing ?? i'll post a pic of the design as soon as i finish drawing it.

[extremeflying]

here is the design. i have not decided on the wingspan and the motor or battery yet but this airplane will be elevon control and the im thinking of using is "Futureboard" and balsa for the moving parts i dont know if u guys have it in the states some help deciding would be good but keep in mind that $ is the problem

[natoquick]

With enough thrust, you can get anything to fly, so yes, you can use a flat plate as a wing. Also, at very small scales, flat plate airfoils are more effective than a "conventional" airfoil. The problem I see is that the elevons would have very little effect, since the airflow would not be flowing over the elevons, it would more or less be flowing alongside the elevons. if you can flatten your triange, making it isocoles-shaped, it would work a little bit better.

[Scott MacAfee]

If you take a look in the 3D forum you will see that almost all of the small planes are flat plte wings, mostly for saving wieght. They fly great, I can say so myself.

[extremeflying]

isocoles-shaped ?? what does it look like ? and what do u mean by flattening my wing ? the future board is already flat
what motor would you recommend ? im thinking a 480 and what size for the prop and do u have the formula the calculate everything i need like Esc , battery,prop,motor

[Scott MacAfee]

Like this:

[Scott MacAfee]

This type of plane is very sensitive to cg changes, so watch out. Would you prefer brushless, lipo, brushed, ni-mh, ni-cd? How long do you want it to fly? How fast? Waht type of flying do you want it to do?

[natoquick]

Oops, somebody beat me to the punch.

[Scott MacAfee]

I dont know much about non-brushless and non-lipo setups so anyone can help.

[extremeflying]

may be 5-7 mins flight time fast would be nice and the flying i'll be doing is basic aerobatics loops rolls im thinking of using ni-mh

[extremeflying]

im not going against your design but im just curious about this other design i have. will this design even turn ? how do u think it will fly ?

[coaxial-gyro]

Use a heading hold gyro .

[extremeflying]

no comments at all on this ?? im just wondering how it will fly nobody thought of this design b4 ?

[extremeflying]

Here is my work in progress

[peterangus]

ex'g

Experiment with small chuck gliders. It's quick, and gives confident answers.

You will find that you need some trailing-edge reflex, and a well-forward CG.

The chuck glider will need a bit of dihedral. A controlled model may be OK with none.

[Sparky Paul]

The color is correct. Don't forget the black edging..
This one got as far as the chuck glider stage, but hasn't been fully assembled as a flier.

[extremeflying]

here is my spec
wingspan: 65.5cm
lenght:61.5cm
i want this plane to be as cheap as possible i wanna how cheap i can go and still get this thing flying nice
i already estimated the cost of the whole plane check this out:
futureboard: about 29 baht which is about 72 cent
Thai made ESC : 400 baht or $10 usd
2 micro servos: 1200 baht or $30 USD
motor480 : about 300 baht or $7.50 USD
battery 1800 mah ni-mh: 600 baht or $ 15 USD
or stuff about $10 the rx i will pull out of my zagi
estimated total cost : $72.5
if i does't fly i'll just get a eurotyphoon fuse for another $35

[extremeflying]

i dont know all these words
could you explain "Black Edging" and Chuck gilder" ??
and some more questions what is the vertical fin that holds the rudder called ?
how do i mount the motor on the board ?

[Sparky Paul]

Extreme, the plane I made resembled a traffic control sign we have here, that's the reason for the "YIELD".. and these signs are safety yellow with black edging.. just an example of my perverse sense of humor.
It's just a sheet of balsa cut to the shape, to toss (chuck) in the air to find where the c.g. might be.
As noted on the image, it's fairly far forward.
The vertical fin that holds the rudder is called.... the vertical fin...:)
The motor can be gumbanded to the frame. It needs only enough support to keep it from rotating against the propellor rotation when the motor is running.
.
I presume the baht is the currency for Singapore?

[BMatthews]

There was some talk on one of the forums a while back about leading edge controls and the outcome was that it was a very bad idea. Stick with rear controls.

Yes the motor can be rubber banded into place or tied in with those nylon zip ties or a number of other methods. Just be sure you use some little bits of triangle stock or similar to cradle the motor so it doesn't shift around. A stop block on the forward edge is also a good idea in case the vibration lets the motor creep forward despite the rubber bands or zip ties or whatever. Basically you want the motor to sit in a side to side and back to front cradle so it cant shift around.

[DaveGherardini]

WOW MOM,, im still busting a gut on that one,

[extremeflying]

baht is for thailand $1 is about 40 baht
i will give this a shot and see how it goes and i might change th location of the control surfaces and try again.

[kdwzagi]

hi

Here is my work in progress


your design has intrigued me so i have used your photo and a simple cad prog to find the Mac and show some sample c of g positions

i think you are going to have lots of trouble getting this wing to balance as most of the weight looks to be behind even a rearward c of g

i think you will have to put a nose on the front to shift the motor forward

peter angus has the best idea, make some small chuck gliders first to see if it will fly

all the best


kev