Yesterday I received propellers, adapter from rcbazaar.

Please see the attached pic for propeller adapter. I ordered on 2.3 mm adapter. I belive rcbazaar has missed sending me the screw to tighten the adapter shaft on the motor shaft. There is one hole on the adapter shaft(as marked by arrow in pic) but there is NO SCREW!!!

I am in search of a tiny screw at home which can fit there. Is there any other way of installing the adapter on the motor shaft?

Thanks.

Yesterday I received propellers, adapter from rcbazaar.

Please see the attached pic for propeller adapter. I ordered on 2.3 mm adapter. I belive rcbazaar has missed sending me the screw to tighten the adapter shaft on the motor shaft. There is one hole on the adapter shaft(as marked by arrow in pic) but there is NO SCREW!!!

I am in search of a tiny screw at home which can fit there. Is there any other way of installing the adapter on the motor shaft?

Thanks.

nadia, it is called grub SCREW look carefully, what you think is a hole could be a SCREW , it is a SCREW without a NUT (Very rare but true)

Thanks for the reply augustinev.

I think you are spot on. There is a hole on the adapter shaft but I cant look across it because its black from inside. Because of this the motor shaft is not going in. Could you please tell me in detail how to install the motor shaft into this adapter? Which screw-driver should I use?

Thanks.

Dear nadia, i would first prefer to look at the hole carefully. U may also use a torch, and you will get to know what type of screwdriver you need to loosen it.

Secondly, if you havent started your build, ill prefer you to change the material.. I have used several materials for planes(Free Flight when i was unaware of this forum), cardboard was one of the worst material i found. Reasons:
1.It was very difficult to join using any material. Even good joints break as it is made up of fibres, which are not very strongly bonded to each other.
2.Cardboard cracks,loosing its stiffness if you want to bend it in curves.(I failed during making of airfoil)
3.Its much heavier than other cheaper alternatives available.
4.Finally, repair to cardboard planes is much difficult, and you will feel like giving up soon.

You need right tool for the right screw, do you have a  Hex Screw driver, have you heard of Alan Key ? very small one will fit in it, get it form a hardware shop. happy screwing

Quote from: augustinev on December 14, 2011, 06:37:32 AM
happy screwing

Thanks a lot augustinev

It was indeed a grub screw and its hex shaped head was too small to be noticed from naked eye.

I have now fixed the adapter shaft onto the motor shaft. But a few older posts in this forum suggest that the motor shaft chould be flattened a bit(using a tool) for better grip. is that true?

I have ordered 3s lipo from HK but will take 2 weeks to arrive. Is there any way I can test the motor attaching with cellphone batteries, 12V DC adapter? I am curious to know how much thrust my motor can generate.

cheers.

Quote from: augustinev on December 13, 2011, 07:26:02 PM
nadia, it is called grub SCREW look carefully, what you think is a hole could be a SCREW , it is a SCREW without a NUT (Very rare but true)

Wrong "thread"!

Where can I find depron and foam dealers in delhi.

Is it sold at stationary shops?

depron goes by the name of BioFoam in Delhi, you get it in Pahargunj area - look for Gokal Chand in some of my earlier posts for exact address

Hi,

After a little research I have got hold of 2 24"x24" coro sheets. I was trying to get 36"x24" but coro sheets are available generally in 2x2 only.

As this is my very first airplane I have tried keeping things very simple. I have come up with a simple plan with the help of which I can cut the coro sheet to give it a shape of an airplane. Please see the attached image for details(The measurement are just indicative, not accurate).

Details:

Wing span        = 24 in
Wing chord               =  8 in
Length of fuselage   = 20 in
tail                  = 10 in x 3 in (approx)
vertical tail              = ??(not decided yet)
planned AUW      = 300-350 grams

The motor I am going to use is a brushed speed 400 motor with 3s 11.V 20C Lipo.

I have read a few other posts for understanding of basic aerodynamics . The problem I see with this plan is that the angle of attack  is going to be zero as the fuse and the wings are going to be in the same surface. Is this really going to be a problem? The motor I am going to be a brushed one and is not expected to produce much power. Experts, please let me know your opinion?

Thanks.

Nadia! Keep the angle of attack as stated in the plan.As the angle of attack is increased, your plane will keep going up continuously, and also increase drag, ie; more thrust required to achieve desired speed. I mean your plane wouldn't be able to fly level. Continuous pitch inputs will be required then. However in RC planes, it is desired to have or not have angle of attack more than zero.
Keep the wings level with respect to the fuselage(As you shown in drawing). Don't worry.

I request senior members to correct me if I am wrong.

Thanks.

350 grams AUW on a 24" wingspan?  Have you calculated wing loading?  Seems ot me to be on the high side which means you want this to fly like a warbird, not floating in  gently or slow flying? 

The specs of my airplane(to be) are (all are approximate):
Wing span = 40"
Wing chord = 8"
length of the fuselage = 24" without adding tail section
horizontal tail =  The area should be around 70 sq inch
vertical tail = I have not started this yet and need expert advice for this. My coro boards are over. I may have buy new one for this.

When I started on the build I thought it will be easy to keep the weight under 350 grams. But I now fear that I have crossed this limit especially after the introduction of cycle spokes(4 for dihedral and 2 for landing gear). I have not weighed the overall assembly but my gut feeling is that it will be a little less than 500 grams. I am using a speed 400 brushed motor with 11V Lipo. I used a 7x5 SF propeller from HK. The motor and propeller combination is generating about 280-300 grams of thrust.

NOTE: I intend my model to be either a free flight on or a control-line one. I dont have any wireless things at the moment. So I am saving weight there.


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Build log:
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I have started the build and have finished a few things. Attached are the pictures of what I have tried building so far:

I have not followed any plans but have tried copying others on the forum. My airplane is a pretty simple and basic design.


PIC1) In order to add a little dihedral to the 2 wings I have used 2 light weight cycle spokes(1 made by welding 2). length of each will be 24". As the platform I used a lightweight hard cardboard ruler. I used epoxy to fix the cycle spoke between 2 plates of cardboard ruler pieces having straight grooves. As a result the wing now is a separate unit and is completely removable.

PIC2) I made wings in a hurry. Each wing is profiled by three pieces of dense thermocol each 7" long. I made the profile curve on the thermocol piece by sanding it. To join the wings and thermocol I have used strong double sided tape. There is visible difference in the profile of wings. But I cant help it anymore.

PIC3 and PIC4) This is how I intend to make my airplane look like. The wings would be removable and could be fixed with the help of rubber bands.

PIC5, PIC6 and PIC7) This is a lightweight landing gear. I made this by hammering 2 light cycle spokes into a soft wood block and then applied a little fevicol and fixed it. I made a groove on the wood block so that the cycle spoke does not move in either direction. I have employed wire insulation and electric tape so the wheel rotates smoothly and straight.

PIC8) i tried giving the tail a little profile by folding the corner part onto the centre. Experts, please advise
   -(i) Do I need more tail area?
   -(ii)Should it have a profile at all?

PIC9) This is my motor mount which is screwed on a piece of cardboard ruler and then onto the base of fuselage. I have used a lightweight aluminium holder which has 2 screw points.(In the picture I have a dead weight attached in there at the moment for flight tests. Please ignore that.)

pics continued...

pics continued...

Consider the RC option.  Going free flight is kind of risky considering all the work you've put in it.  At least try 2 servos (rudder and elevator). and the Hobbyking TX/RX.  Vineet may have one for you.

If my airplane has 280 grams of thrust and 500 grams of weight, will my model fly? Wing span = 40, chord = 8.
An earlier post says we need 60% to 70% of thrust(relative to the weight of the model)  to fly.

If not then can the experts please pass on suggestion about reducing weight of the airplane?

Thanks.