Radio Control Plane Made from Bamboo Sticks

I don't think we can possibly tell from the information provided.

I would suggest you need to look at appropriate aerofoil sections for model planes, it look to me that your wings are virtually flat. A quick look on Google brought up that link which looks useful.

I think matching the propeller shape/size to the motor will also be critical.

Del

ya the wings are flat. i have trimmed the propeller & made it of 8x2cm. i have connected propeller to a small gear box of 1:3 the propeller shown is old i have modify propeller. is the air foil section is important? because when i used the rubber band for this plane the plane was flying.

Where is the centre of gravity when the motor & batteries are mounted?

Right, he didn't mention a power source, did he? Given that, the motor pictured should carry the craft all the way to the crash site.

no i will adjust the centerof gravity. but the matter is that motor will produce that much thrust that plane will fly? if u have some formulas / pdf then plz give me!

Oh my goodness! Propeller at 15,000 RPM?

Make the prop longer (as long as it can be and clear the ground when fuselage is horizontal), increase the prop chord and pitch by 50% +/-, and REDUCE the RPM of the motor to something like 600 RPM to start. Experiment from there.

You and I have discussed the airfoil of the primary lift element (wing) before; have you made those improvements? Del the Cat also has concerns about the wing profile. It does not look as if you have lengthened the wings yet, nor have you created an airfoil, counting on angle of attack (AA) for lift. It appears more than 50% of the thrust generated will be required to overcome parasitic drag from the AA of the wing alone.

It also appears the Center of Pressure is forward of Center of Gravity. JohnDg has a good question: how will motor and battery affect this? For a good explanation of why this is important, review this Wiki article on Aerodynamic Center.

I see nothing in your material list about radio receiver, servos and linkage, and control battery. Have you discovered some components that have no mass?

currently i m collecting the material. after that i will assemble it battery pack i am using is 2 li-ion battery each of 500maH 3.2v 15g! i dont know how to calculate profile of airfoil shape so i havnt used it? if u know the plz tell me? thanks!

As you note in your OP, we have been watching your project for 2 months now. I believe you have decided (for one reason or another) to build yourself every part possible. From that, I assume you wish to build your propellers yourself. (Note I said propellers... as in more than one. You will have to experiment). A home made prop is why I urge you to REDUCE the RPM of your powerplant... bigger blade area and a steeper bite angle, and swing it SLOWER!

This link discusses propellers for gas engine planes, but still has good information for review. One thing not mentioned there is propellers are 'handed' for rotation. When facing the airflow, if the top of the propeller moves to the right it is a Right Hand and if to the left it is Left Hand. Another way to say it is, as viewed from the front of the plane, a right hand propeller turns counterclockwise and a left hand propeller turns clockwise. Be CERTAIN to match the hand of prop with the rotation of the motor!

Have fun, and be safe! Let us know how it goes.

Here are some possible engine/motor choices: http://www.vintageglowengines.com/

(It looks as though Cox inherited the Thimble Drome concept and have now added some electric motor options to their line-up.)

i will do what u have suggested to me & as my plane gets fly i will definitely inform u all!

thanks all above members for helping i will come to u all again if i fail!

I admire your attempt. Don't make this rocket science. If you can spend one evening on line, you can find catalogs of model kits and, "Almost Ready to fly," kits

From these and UTUBE videos you can get a really good idea of what works, and what engines are being used with what sized airplanes. Start there. No calculations needed.

finding ur self increase ur knowledge & nothing is greater than knowledge!

ya thanks i will go for ur suggestions.

i am finding it on google!

How come someone gave you a GA when you asked 4 Qs.
Del

Coz there int a GQ button, init?

nothing here makes sense to me...

And here I thought I was the only one! Glad to know I'm in good (answer) company!

I'm sure I'm highly influenced by the culture that I was raised in, and I want to give a lot of slack for the differences, but...

For myself, I built rubber band balsa wood kit planes that were superior to what I'm seeing, (similar to this)and in public school with paper airplanes learned the basics of aerodynamics, degrees of freedom, and balance (COG). I also bought the .049 engined plastic stuka that was string controlled. I've also built many styrene model airplanes, kites, etc... and a full fledged RC plane. the list goes on. I also have a simulator, in preparation for the day when I become a full fledged RC 'real' pilot.

I'm not seeing an awareness of these fundamentals in the model. Probably bamboo is harder to work with, but one would think that if one is turning to bamboo, that an understanding of existing technologies (balsa, rubber bands, airfoils, etc) would be prerequisites, before turning to innovation and substitution of materials... ?? don't you think. I admit that the engineering mind wants to study these things, but the model doesn't even look to have symmetrical wings, to me. so at the very least, there are construction quality issues.

Here is an example of someone else's scratch built plane.. but at least it is symmetrical.

Chris

ps... here is an interesting old site I came across.. although there is some sort of IE certificate problem with the site.

You can put a thrust source (engine) on a rock and it will fly.

What is the thrust of the motor-prop comination?

What is the thrust-to-weight ratio?

What is the wing-loading? Get it too light and you have a glider. Get it too heavy and you have a rocket.

Just looking at the picture, I'd guess that the plane is tail-heavy. Remeber: Aplane that is nose-heavy flys pooly, while a plane that is tail-heavy flys once.

go to nitroplanes.com for a good tiny motor, go to amazon.com for a lithium ion battery,

put some cord airfoil onto the wing and remove the fatty tires and go for simple thin low drag disc's for wheels, balace the plane for cg just a smidgen in front of the chord of the airfoil, chord is the thickest part of the airfoil, cg is so when you stall it it will automatically dip the nose and speed back up to start flying again, airfoil is better then angle of attack for small planes with little power as the flight lifting surface provides lift rather then the whole wing acting as a horizontal rudder, look at the single surface wings used on some ultralight airplanes for ideas, the little motors are super strong for the size now, and li battery will give more power than imaginable for this app, may give carbon fibre tubing a look for spars,

good luck
Mitch ret peugeot mech

thanks to all my above friends who have spent time to solve my problem. i will try my efforts & if got success then definitely inform u all. Thank Once Again!