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« on: March 17, 2014, 06:53:55 PM »
ashJR7202
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Its been long time since I post anything on RCI!!!!!

Was building bigger Alula so thought of making it my entry for sweepstake!!! Drool

After enjoying night flying with my earlier 50” Alula, I decided to make bigger one.
http://www.rcindia.org/electric-planes/biofoam-50%27-alula-powered-swept-forward-flying-wing/
Last one was KfM2 airfoil, and now wanted to make full airfoil, MH45. So decided to do hotwire Cut with HD thermocol.
It is actually swept forward wing having really good flying characteristics. Planning for completed 66” wingspan this time…
Hotwire cut was totally unexplored area for me, so started building bow…
But thanks to Rahul Roy, I borrowed is Bow and his complete setup for hotwire cutting…
Bought few HD and normal Thermocol, wasted almost 4-5 sheets while practicing, u need 2 people to operate it!!!  Bang Head Bang Head

Draw scale diagram of airfoil in Corel Draw and then Laser cut airfoil on 3mm veneer Ply, as u can see it in picture!!!!
Used my earlier plan as guideline for the new bird.
Using HD thermocol, after cut both wings are weighing only 170gms


1.jpg
Scratch built 66” Alula using HD Thermocol, my entry for Sweepstakes
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« Reply #1 on: March 17, 2014, 06:55:15 PM »
ashJR7202
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Some wastage and finally was able to succeed

5.jpg
Re: Scratch built 66” Alula using HD Thermocol, my entry for Sweepstakes
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« Reply #2 on: March 17, 2014, 06:56:10 PM »
ashJR7202
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SOme more

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Re: Scratch built 66” Alula using HD Thermocol, my entry for Sweepstakes
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« Reply #3 on: March 17, 2014, 06:57:22 PM »
ashJR7202
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Finally was able to cut it

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Re: Scratch built 66” Alula using HD Thermocol, my entry for Sweepstakes
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« Reply #4 on: March 17, 2014, 06:58:14 PM »
ashJR7202
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Here is 2 piece wing

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Re: Scratch built 66” Alula using HD Thermocol, my entry for Sweepstakes
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« Reply #5 on: March 17, 2014, 07:36:42 PM »
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awesome work on the wings!! keep it up!
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« Reply #6 on: March 17, 2014, 10:06:19 PM »
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Beautiful!
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« Reply #7 on: March 17, 2014, 10:23:28 PM »
rastsaurabh
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Very good .... thats a huge wing. how are you planning to strengthening it ? covering with glass fiber? or paper ....

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« Reply #8 on: March 17, 2014, 10:39:14 PM »
utkarshg13
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Very beautiful Clap Clap
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« Reply #9 on: March 17, 2014, 11:49:21 PM »
shobhit17
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lovely log of the construction..... Have loved the Alula a lot for sometime..but am at a loss of how to build it.... can you please share your drawings and methods with us here please....
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Well I been into aeromodelling since I was in School....  had won the "WINGS Open" at "Bombay" (as it was known then) in 1985 for control line aerobatics (was doing my graduation at that time) and had received a big gold trophy....  Mr Bhivandiwala organised it and gave good awards.
Our team had won the following medals:-
1.   Gold for Control Line Aerobatics
2.   Silver and Bronze for Control line speed
3.   Bronze for Free Flight Glider
Sharma Models helped us train to win the medals
 

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« Reply #10 on: March 17, 2014, 11:56:07 PM »
VC
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Look at the cross section of those wings!!! This guy is a master cutter.
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« Reply #11 on: March 18, 2014, 09:45:53 AM »
rastsaurabh
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A tip for hot wire cutting... i am sure you must be having issues at the trailing edge.. it must have been too thin....

Keep the trailing edge of the template little out if the HD foam, say 1/2 centimeter... you will get very clean trailing edge.
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« Reply #12 on: March 18, 2014, 09:47:14 AM »
shobhit17
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Yes VC.... I too saw this and am happy that there is someone who can teach at least me how to cut HD thermocol...  I stopped cutting HD Thermocol when I spoiled 2 wings.  I am back to sanding out HD thermocol...
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Well I been into aeromodelling since I was in School....  had won the "WINGS Open" at "Bombay" (as it was known then) in 1985 for control line aerobatics (was doing my graduation at that time) and had received a big gold trophy....  Mr Bhivandiwala organised it and gave good awards.
Our team had won the following medals:-
1.   Gold for Control Line Aerobatics
2.   Silver and Bronze for Control line speed
3.   Bronze for Free Flight Glider
Sharma Models helped us train to win the medals
 

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« Reply #13 on: March 18, 2014, 09:49:00 AM »
shobhit17
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AshJR.... do let us know how do you cut thermocol.... detailed pictures and a tutorial on how to do it... it will be of great help to many of us including me...
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Well I been into aeromodelling since I was in School....  had won the "WINGS Open" at "Bombay" (as it was known then) in 1985 for control line aerobatics (was doing my graduation at that time) and had received a big gold trophy....  Mr Bhivandiwala organised it and gave good awards.
Our team had won the following medals:-
1.   Gold for Control Line Aerobatics
2.   Silver and Bronze for Control line speed
3.   Bronze for Free Flight Glider
Sharma Models helped us train to win the medals
 

Read
« Reply #14 on: March 18, 2014, 10:14:08 AM »
ashJR7202
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Thanks guys!!!

Hey VC, thanks for the complement, seems like u forgot me, was away for sometime!!  Giggle

@rastsaurabh, I am planning to use aluminum C channel as spar and also planning to make it detachable 2 pieces, let see how it goes   Head Scratching
@shobhit17, about drawing it is posted in my earlier thread, link mentioned in the 1st post. you can use it to make your own bird. full PDF and A4 also attached in that thread.
These wings are cut using hotwire cut and believe me I wasted almost 3 HD sheets and 4 Normal Thermocol sheets while practicing... Bang Head Bang Head
lekin Kida mara nahi....i wanted to do it.....no matter what!!  >Cheesy >Cheesy

For hot wire cutting, I think Rahul Roy has created some good thread..let me check

found it:  Hats Off
http://www.rcindia.org/electric-planes/my-experiment-with-a-scratchbuilt/
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« Reply #15 on: March 18, 2014, 10:14:48 AM »
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Fellow modelers have a look here ....... a tutorial for hot wire cutting ...

http://www.rcindia.org/for-sale/wing-core-made-of-high-density-thermacol/msg154985/#msg154985
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« Reply #16 on: March 18, 2014, 10:32:48 AM »
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Ashish what are the plans for the tail? I honestly hope you up-size it by atleast 20% compared to the last build.
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« Reply #17 on: March 18, 2014, 11:06:11 AM »
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Good to see you Ashish back posting here
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« Reply #18 on: March 18, 2014, 12:41:13 PM »
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Re:

Great wings ..... Good going ... All the best
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« Reply #19 on: March 18, 2014, 01:49:17 PM »
ashJR7202
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Hey Rooster thanks!!! how u doing man...long time!!!! any boat for Sweepstake!!!
@SLS, ya i can try that!!! but chances are, that it might look out of proportion!!!! if i increase surface, can also put rudder.... can think of it!!!! but as per our discussion earlier, I need to figure out how to make airfoil on tail....will that really help!!!
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« Reply #20 on: March 18, 2014, 06:56:54 PM »
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Thanks Ash... guess I reverted back to good old sanding block and gave up the hot wire cutter... I was using a bamboo bow with the Guitar E string and my inverter battery as power source. Lets see how it goes the next time.... But still you please give ur expert tips on the issue of hotwire cutting to us... Thanks for the info on the plans.. Will surely look at them.
regards
Shobhit
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Well I been into aeromodelling since I was in School....  had won the "WINGS Open" at "Bombay" (as it was known then) in 1985 for control line aerobatics (was doing my graduation at that time) and had received a big gold trophy....  Mr Bhivandiwala organised it and gave good awards.
Our team had won the following medals:-
1.   Gold for Control Line Aerobatics
2.   Silver and Bronze for Control line speed
3.   Bronze for Free Flight Glider
Sharma Models helped us train to win the medals
 

Read
« Reply #21 on: March 19, 2014, 08:38:02 PM »
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Ash, I did some searching but was not able to find anything that supports the theory of having a symmetrical airfoil on a vertical stabilizer would be of any significance. So i guess a simple strong tail with a smoothed out leading edge should be fine.
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« Reply #22 on: March 19, 2014, 09:05:05 PM »
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Well... dear SunLikeStar.... the symetrical aerofoil on the fin is given so that it has equal forces from both the directions... of you give semi symetrical it will produce a directional force (lifting force) from that side of the aerofoil... well all aeroplanes have a strictly symetrical aerofoil.... For you if you wish you can just keep the fin straight and round off the edges.....  This way it though it will not be an aerofoil but will give the desired stabilising effect.  This may have higher skin friction drag but it is OK for a model...... for an aeroplane it will be terrible.
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Well I been into aeromodelling since I was in School....  had won the "WINGS Open" at "Bombay" (as it was known then) in 1985 for control line aerobatics (was doing my graduation at that time) and had received a big gold trophy....  Mr Bhivandiwala organised it and gave good awards.
Our team had won the following medals:-
1.   Gold for Control Line Aerobatics
2.   Silver and Bronze for Control line speed
3.   Bronze for Free Flight Glider
Sharma Models helped us train to win the medals
 

Read
« Reply #23 on: March 20, 2014, 09:06:07 AM »
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nicely done !
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« Reply #24 on: March 20, 2014, 11:03:05 AM »
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the symetrical aerofoil on the fin is given so that it has equal forces from both the directions... of you give semi symetrical it will produce a directional force (lifting force) from that side of the aerofoil
We already know that we require fully symmetrical or a flat surface. And I'm pretty sure no one would want to use a semi symmetrical airfoli as a vertical stab. But what we were actually interested in is the kind of airfoil (as in which fully symmetrical airfoil) used and the impact of different airfoils on flying characteristic. Not to mention the a flat surface with rounded edges is also a fully symmetrical airfoil. Even better is a rounded leading edge and a tapering sharp trailing edge. And after all I have a couple of very good gliders and both have vertical stabs with rounded leading edge a slightly thinner trialling edge. I wonder if there is a name to this airfoil.
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