It Should Fly GREAT also  , i have a small doubt in one small corner of my small mind of its capability.

Sandeep

You should apply 3M 2 inch or 4 inch tape span wise on the wing to remove the warps. And add more ribs to ensure a clean and constant camber for the wing. Why did you cut the wing into sections. Not enough foam or only strips?

Wonderful build. I am sure it will fly as good as it looks.

Quote from: tg on September 10, 2009, 12:46:35 PM
You should apply 3M 2 inch or 4 inch tape span wise on the wing to remove the warps. And add more ribs to ensure a clean and constant camber for the wing. Why did you cut the wing into sections. Not enough foam or only strips?

I have to cut the wings into section as i have to slice my 6mm depron into 3mm, since my blade is not such long to slice the entire width, i have to cut them into sections.

Yup, the best/worst part of a scratch build is finding the right tool and material for the job.

Right now, am finding it difficult to comeup with suitable material for firewall that can sustain a 550W 42mm outrunner weighing about 140gm..... I wonder if I would be able to takeoff... 

Here are the final built Pics of Blazy Bee:
1.

2. Thanks to Subu, who made the wing for my Blazy bee..... 

3.

4.

5.


Maiden will be on 2nd
Video will be posted on 5th Oct.
Sandeep

what is the AUW ?

  , i don't have option to check the AUW.. will try with my local shop here..

Aaaaahh!!! feels good to be back to the build log after a long gap. Well as I write I do see a lot of new icons/smileys.

Anyway, finally ordered Lipo from HC. Was wanting to know about A123 cells and how to program the ESC for these, but for the lack of knowledge ordered Lipos instead. Have also ordered TowerPro ESC after seing the pictures of them on Subbu's space shuttle log.

So the order looks like this
  2 x 3AH batteries
  2 x 40A Esc - one extra just in case!!!!
  11x7 props
  50W charger
  charge bag
  4 mm bullet connectors - and some more bits and pcs.....

So another long wait for the materials to arrive - I don;t think they have dispatched it yet.

In the mean time, back to building the cub. Its taking up quite a lot of time and the joins are not as smooth as what we get in balsa models. This is the first time I am building a foam model and more than half the time I am wondering on the strength and trying to add some more material to it. At this moment, my main concern/fear is that I may be over engineering the model to an extent that it becomes too heavy to take off - that would be painful.  I guess I should try to get hold of a balance to check the weight of the model - am thinking of a spring balance but wonder where I can get one.


BTW, Sandeep. Good to see the finished version of Lazy Bee - did you manage to maiden it yet?

Pankaj

Yes Pankaj , i maiden the blazy bee..but unfortunately due to low height of Vertical stabilizer...it wobble in air and crashed badly.....i have put new vertical Stabilizer and will try this Saturday again.... hopefully it should fly now....

OK,

One of the primary requirements that I had while starting on the scratch build was the 2 part wing system that could be assembled or disassembled easily. I took me a while to figure out how I could do this.

On its own, the wing assembly is not complete, but have got the base with reinforced carbon. The load carrying  spar is a 6mm x 6mm square carbon tube. The leading edge is has a 2.5mm fiber rod

Closer inspection of the wing join...

I have done is cut 4 pcs of 2 inch length of 5mm carbon tube. The outer has been reinforced by a strong silk thread with epoxy. This was done to increase the friction between the surfaces as well as to provide extra protection to the small carbon pcs.  Inside the two tubes, have inserted a reinforced fiberglass rod with enough traction that it fits tightly. These have then been joined with epoxy to form the 'male' part of the connector.

Once the 'male' connector was ready,, applied grease to extender fiberglass rods and slipped in the other 5mm tube. This entire contraption was joined by epoxy all the while holding the wing at an angle to form the dihedral.

So, now after drying, when I just join the wing using these connectors.... I get the following....

I shall now put the ribs on this base and cover it with 3mm biofoam......

On the fuse, the basic form has taken place, I shall now work on putting on the wheels and also giving shape to the cowl.. For the engine mount, I do have an X mount supplied with the motor. In order to install it, I have a 6x6mm carbon tube connected to a small laminated sheet (used for mounting the electrical switches at homes). The drills are in place to accept a self thread screw to attach the X mount.

For housing the servos in the parcel tray, I have first pasted a balsa sheet on the parcel tray with large holes to accommodate the servo housing. The servo itself has been installed on a smaller piece of balsa then the entire setup has been screwed to the parcel tray. Well I could have used less balsa on the parcel tray but what the heck........

Good going Pakaj. This is one of the "neatest" build I have seen in RCindia. Keep it comming.

-Ismail

Been busy building the model....

For wings, I have used fiberglass rods as spars and thermocol ribs, then have covered with a 2.5mm bio foam sheet. The top surface was first heat treated with a blow drier to give a rough shape to te aerofoil...

finally glued the top layer for form the wing... At the base, cut out a small square for a pc of balsa to act as the tray for the servo

Some more of the fuse being built.. The cowl and the nose assembly

finally all the pcs together...... Tried to check the weight, but since I do not have a kitchen scale at home, tried with a contraption of balancing against a 600ml pet bottle filled with water (so the wt should be around 650gm) the model with motor,wheels and servo is almost the same wt. The only thing missing is prop, esc and battery.... so the all up wt should be within 1200gms which was the target set at the start.....

  

What prompted you to add this type of wing tips ?

Actually, I could not figure out a way to gradually taper the wing tip, so next best I could do was to build a block and file away to glory 

Instead of that you could have continued the upper surface of the wing all the way to the end and taper the under side instead. Thats done on virtually all ARF trainers. The wing has a level surface end to end and the taper is on the lower surface.

Dear Pankaj, Gr8 work............. but looks like u have really complicated a very simple build model! The bee is not a model basically designed for durability...... except the original Clancy's balsa bee. Urs looks ready for battle. Gr8 effort but seems way too heavy!

Pankaj

Great build...could you please post some pics of the fuse internal ribs or bulkheads...also where did you get those landing gears from..Waiting for the video.