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« on: August 14, 2009, 03:48:58 PM »
merog
Scratchest Aeromodelling ;)
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Hi guys,

I thought this is (Beginners Zone) the most suitable place to post this build log. Actually this is the model called "Trainer One", designed by an US guy, but from Blue cor! And that exact building is somewhat difficult to us, the INDIANS with all the stuff available in our market! So, I started to modify it a little bit and started to build!

You can see the original hot thread of 'Trainer One' here: http://www.rcgroups.com/forums/showthread.php?t=383687 (Plans are also available there)

Here we go:
This is a complete foam plane based on our Favorite THERMACOL (Technically, its an half inch EPS sheet). The plane is 34 WS, 3Ch (Throttle, Rudder and Elevator), Tip dihedral (3") Trainer.

Other specs I wish to incorporate are (I have selected from my collection of RC stuff):
Motor: GWS 12-R-XC Brushed (http://www.gwsus.com/english/product/MOTOR/MOTOR.HTM)
ESC: GWS ICS100 Brushed (http://www.gwsus.com/english/product/speedcontroller/speed%20controller.htm)
Prop: GWS EP3020 (http://www.gwsus.com/english/product/propeller/propeller.htm)
Receiver: Some 6 Channel Hitech (But only 3 ch are required)
Battery: I am gonna use EP Kokkam 11.1V 650mAh 3S, but it will be better if 2S 7.2v is used!
Servos: One is GWS micro and other one is Park zone Micro servo (Which I wanna use from my scratch)
Landing Gear: Custom landing gear (I have composed from scratch).

Tools required (As an INDIAN):
Hot wire Foam cutter (It is easy to make one; If not no problem, one craft cutter will do the thing, but should do cuttings with care, to get smooth surfaces)
Bamboo skewers or Sticks of approx 0.5mm dia
Hot glue (I got one easily in our market of Vizag)
Fevicol SH (White glue)
Araldite (Epoxy; but unfortunately it needs overnight)
Other Misc. items like packing tape (Cello tape)..etc

See the pics of those stuff, and I hope you enjoy this build, which I can post regularly, parallel to my Step wise build. I think I can answer any doubt about these steps.

DSC02826.jpg
"Indian Trainer" Build Log: An Excellent Indian Material Based Trainer
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« Reply #1 on: August 14, 2009, 03:55:17 PM »
merog
Scratchest Aeromodelling ;)
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So, let us continue to build the body first. We can have the tiled plans from the link I have given you in the beginning at RCG. So, I took the half inch EPS (thermacol) and nicely cut the wing with flat bottom airfoil, and all other parts like Fuse, Stab by using Hot wire Foam cutter. See the pics!

I have hinged the control surfaces of Ruder and Elevator with Packing Tape (Cello tape). Remember to cut one of the surface to 45 degrees slant angle!

DSC02770.jpg
Re: "Indian Trainer" Build Log: An Excellent Indian Material Based Trainer
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« Reply #2 on: August 14, 2009, 03:59:42 PM »
merog
Scratchest Aeromodelling ;)
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Actually all the previous steps were done two days back, but I started to post today! And today I have marked for cutouts for the equipment on board!

Here are the pics!

Stay glued till it flies! And any doubts are really appreciated, as they may keep me thinking about most practical bugs to fix!

Let me see how all you guys feel up to now!

DSC02822.jpg
Re: "Indian Trainer" Build Log: An Excellent Indian Material Based Trainer
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« Reply #3 on: August 14, 2009, 11:19:02 PM »
sahilkit
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nice one merog will be keenly watching  Smiley

best

sahil
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« Reply #4 on: August 15, 2009, 05:34:05 PM »
PankajC
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Learning to Fly



Merog,

How do you manage to make a hotwire cutter?

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« Reply #5 on: August 17, 2009, 07:45:47 PM »
merog
Scratchest Aeromodelling ;)
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Dear Pankaj,

The hot wire cutter is a simple Bamboo Bow of 34inch approx. with guitar steel string (ask for guitar steel E) connected to a 12V 3Amp power. Thats all it does the thing.

If you want me to get you some pics of it, give me a day or two, as am very busy at work these days!

Regards...//MEROG
Merog,

How do you manage to make a hotwire cutter?


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« Reply #6 on: August 17, 2009, 07:53:44 PM »
merog
Scratchest Aeromodelling ;)
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Guys, welcome back...

I forgot to tell you the modifications I have done, apart from the plans there in RCG. They are as follows...

1. I have made it a wing with solid flat bottomed airfoil, so, obviously need to flatten the upper surface of the fuse where exactly the wing will be placed.

2. The battery slot, I made it in such a way that the batt. sets horizontal to the ground (you ll see it in pics later)

3. Changed the servo positions...

4. Ooops, forgot, the main thing is we need to cut the motor and prop grove according to our requirement!

Thats all, these are the modifications.
Am going for the next post for the building process...

Stay glued.... Wink//MEROG
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« Reply #7 on: August 17, 2009, 08:03:36 PM »
merog
Scratchest Aeromodelling ;)
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Guys,

Now, lets start with the wing. Am attaching all the pics of most possible details, hope they may explain better, as 'one picture speaks thousand words'!

Unlike in the plan, I took the wing in 3 pieces (not 4), to decrease the weight by avoiding glue!

And when attaching the tip pieces for tip dihedral, take the angle to cut at the tips of the middle main piece as shown in the images. Hope the images explain well. If not understood, please post,  I'll clear!

And try to avoid the Hot glue. Be patient, and apply fevicol only and wait! It reduces lot of weight!

And when it is glued and placed to get fit, the dihedral should not be disturbed. The set up for that is in the pic, have a glance!

DSC02846.jpg
The Wing
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« Reply #8 on: August 17, 2009, 08:08:25 PM »
merog
Scratchest Aeromodelling ;)
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The pics continued...

DSC02856.jpg
The wing... contd...!
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« Reply #9 on: August 17, 2009, 08:11:46 PM »
merog
Scratchest Aeromodelling ;)
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When we glue it set it up to settle... pics contd....

Remember the height at the tip is 3", which gets the enough dihedral!

DSC02857.jpg
The wing... contd...!
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« Reply #10 on: August 17, 2009, 08:24:27 PM »
merog
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Guys,
So, nice wing was made!

Now this is the time to up with the Fuse. Stab is attached again with the Fevicol and a grove at the bottom of the fuse is made with the help of Soldering iron. But should be very careful that it should not be deviate from exact center of the thickness of the thermacol!

And I have made the control horns out of Mobile SIM bearing Cards (I think you got it), or the used credit or debit cards can be used. And the push rods are too in the pic.

While installing the control horns, care should be taken such a way that the hole of the horn comes exactly above the hinge of the elevator/rudder! For that, use a scale as shown in the pic.

That's for now, up to this post, am going to another post to continue!

Stay Fevicoled  Wink


DSC02868.jpg
The stab and fuse!
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« Reply #11 on: August 17, 2009, 08:31:44 PM »
merog
Scratchest Aeromodelling ;)
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Folks,

now lets do build the most stronger part, the Bamboo Chasis, bearing wheels and tail dagger!

Here, to stick the wheels very tight and strong, I have made a slit in the bamboo stick, inserted the wheel holders' upper tip in that and Hot glued and twined!

Then the tail dagger is of the bicycle spoke, twined and hot glued.

Remember the total length of the Bamboo base stick should exactly be the total of the Fuse with stab. And should fit good in the grove.

Then I put the Bamboo chasis with the Wheels and Tail dagger in the grove and Hot glued.

That's again for now...

DSC02875.jpg
The Bamboo chasis!
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« Reply #12 on: August 18, 2009, 05:22:55 AM »
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Neat man. keep the updates and post your maiden. All the best.
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« Reply #13 on: August 18, 2009, 07:49:57 AM »
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Good going  Clap
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« Reply #14 on: August 18, 2009, 09:35:44 AM »
merog
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Friends...

Hope you are enjoying my post! As no body is posting some doubts to clarify I feel that I could explain very good! And friends, I forgot to tell you another important modification, that is: As this plane is to be equipped with the pusher prop, the motor should be connected reverse. No problem with the function. It plays well, just reverse the polarity, thats it! Orelse the planne goes backwards and hit something (happenned to me before when I was testing one! Cry, which had broken the plane).

Ok, lets have a glance at how the mounts are made on the fuse. Have a glance at the pics, they could explain you how. I have used tooth pics for motor and wing and again Mobile SIM bearing card pieces for the screw mounts for servos.

And according to the pdf plan, we need to place a bamboo stick at the cockpit!

Stay (bamboo)sticked Wink.... till another post!

DSC03040.jpg
Mounts for Servos, Motor and Wing
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« Reply #15 on: August 18, 2009, 09:42:13 AM »
merog
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Guys,

Now lets install the wing. As I wanted to make it detachable, I have fecilitated it with the tooth pick mounts, so it can be rubber banded. But we need to support it with Bamboo sticks. So, we need to hot glue them under side. But still no problem, if it to be transported, it can still be removed carefully, but need to hot glue again at the tips of bamboo, underneath the wing.

Here are the pics. So, finally the airplane's body will look like this. When we place on the ground, along with the wing, it should stand balanced. If not, need to check out the orientation of the wheels.

It is getting HOT! Is in't it?

DSC03049.jpg
Wing installation!
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« Reply #16 on: August 18, 2009, 09:58:56 AM »
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merog what is your target AUW Huh?

1.the fuse has to be covered with clear tape to give it a very good strength and cover the wing as well !

2.the battery mount section in the fuse's front part is too week please reinforce it !

3.smooth your horizontal leading edge surface!

nice to see the thing coming to life.

best

sahil

 
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« Reply #17 on: August 18, 2009, 10:03:48 AM »
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and reinforce the wing center top section with two small pieces of wood to give the foam some strength and prevent the rubber band from damaging the wing

sahil
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« Reply #18 on: August 18, 2009, 11:57:22 AM »
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Excellent build.. Clap

I love to have the braces on the tail feathers like you did. It always proves to be worth it.

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« Reply #19 on: August 18, 2009, 01:55:16 PM »
merog
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Dear Sahil,

Thanks for all your suggestions. But I have taped the rubber band portion of the wing, to protect it from tearing, but the tape is invisible as it is transparent.

AUW should be less than 300g, as the motor/prop has a thrust of 300g max. Lets see how it will perform!

Thank you very much once again...//MEROG
and reinforce the wing center top section with two small pieces of wood to give the foam some strength and prevent the rubber band from damaging the wing

sahil
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« Reply #20 on: August 18, 2009, 01:59:08 PM »
merog
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Guys,

Now lets go on to the next level. The installation of the on board equipment. And sahil is right. He want me to reinforce the body to have good strength. But let us see, how it does naked!

Here are the pics of completed airplane, with everything RTF.

DSC03053.jpg
Installing on board equipment!
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« Reply #21 on: August 18, 2009, 02:06:10 PM »
merog
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Friends...

Now as am so anxiuos to test it's functionality and balance on land, let me test it!

So...

Shut all the windows (as it may sounds like hel!)

Shut all the doors...

Switch off the fan...

Here we GOOOOOOOOOOO.......



Thanks for watching. As it is raining here today, I need to find another day wothout much wind and rain, and with good weather to take off! Here in our city Vizag, as it is a beach city, all the days are WINDY!

Please stay glued to watch it flying REAL!
Hope you enjoy!

MEROG
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« Reply #22 on: August 18, 2009, 02:28:59 PM »
sahilkit
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Quote
as the motor/prop has a thrust of 300g max. Lets see how it will perform!

is this the power setup you are using ??

http://www.gwsus.com/english/product/powersystem/edp50.htm

then it can produce only 60grams of thrust at 7.2volts with a EP3020 prop

in the video did you give full power at the end ?? if so then.....lets see what other could say

bye

sahil


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« Reply #23 on: August 18, 2009, 02:33:34 PM »
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oh in the video was the fuse twisting while testing servo movements or cam effect ?

sahil
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« Reply #24 on: August 18, 2009, 04:12:50 PM »
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great work merog bhaiya just sand the rudder to v type end and the elevator too


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