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« on: July 23, 2012, 11:35:20 AM »
umeshk
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HI
I am beginner scratch building a Big Beaver Foamy.
I am new to the hobby with a little knowledge of electronics.
The specs of my home built are

Airframe weight 390 gram.
Expected AUW around 800 gram ( excluding battery )
Wing Span 62 inch Chord 7.5 inch

Motor  Turnigy G10 1100 Kv Brushless outrunner ( http://www.hobbyking.com/hobbyking/store/__14403__Turnigy_G10_Brushless_Outrunner_1100kv_.html )
Esc Hobby King 40A
Servos 4 nos. 9gram ( Ailerons 2, Rudder and Elevator )

Can you experienced modeler please suggest me a good lipo battery ( specs and brands ) for this setup..
I am very confused which batteries to buy. Please suggest should I buy from Hobby King or some local Hobby shops
How good are the Indian Batteries ( IndPower ) etc
I want a decent flight time ( around 10 to 15 mins )

Other question is about the motor
Is this motor sufficient for the current configuration or is over rated..

Thanks in advance for your valued suggestions..

regards
Umesh
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« Reply #1 on: July 23, 2012, 03:12:26 PM »
shadman_alam
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Post some pics..
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« Reply #2 on: July 26, 2012, 01:27:20 PM »
umeshk
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Hi friends,
I am new to the hobby with a very little knowledge of electronics or aviation. I decided to scratch build some model and found Big Beaver to be very attractive and easy for my first model, though I was advised to start the hobby with some slow flyer trainer.
This thread cannot actually be called  a build log because I havent been logging progress of my home built .. but I had to do this coz every time asked the seniors for help it was difficult to do so without looking at pictures.
So in the Hope of getting support from experienced flyers and modelers heres the pictures...
Now on I will be logging the progress of my build on a regular basis ..

thanks

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« Reply #3 on: July 26, 2012, 02:28:29 PM »
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Great Finish, Material looks very good, what is it ( pink foam ?) and where u get it? pl provide details and more pictures.
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« Reply #4 on: July 26, 2012, 02:33:55 PM »
rastsaurabh
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Dear Umesh,

What is the material you used Huh? how strong is it??

And very nice finish you have given.
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« Reply #5 on: July 26, 2012, 03:43:12 PM »
umeshk
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Thanks..
The material is Extruded Polystyrene also known as Pink Foam or Styrofoam ..  manufactured by Owens Corning company. It is easily available with stores who sell insulating material like glasswool etc. Its a very popular material with aeromodelers the world over because of its light weight, ease of use and strength.
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« Reply #6 on: July 26, 2012, 05:07:37 PM »
VinayakR
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It is easily available with stores who sell insulating material like glasswool etc.


Hi Umesh,

Can you please provide shop details where you bought it from india ?  Drool

May not be helpful for me but defiantly help enthusiast from Rajasthan. Salute

-Vinayak.
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« Reply #7 on: July 26, 2012, 05:13:46 PM »
umeshk
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This is available at Daksha Enterprises, Gopal pura bye pass. Ph 9414060994. But they keep 40mm and 50mm thick only.. You will have to hotwire split them to desired thickness..
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« Reply #8 on: July 26, 2012, 05:22:34 PM »
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Thanks  Salute
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« Reply #9 on: July 29, 2012, 11:15:43 AM »
umeshk
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Time to fix wings... but stuck with Dihedral...
Can any one please suggest me the Dihedral angle...
the wing is  29" from root to tip and the span is 64 inch.

thanks
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« Reply #10 on: August 09, 2012, 11:52:04 AM »
umeshk
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My Big Beaver now Almost Ready To Fly...
« Last Edit: August 09, 2012, 01:35:31 PM by rcpilotacro » Logged
 

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« Reply #11 on: August 09, 2012, 11:58:35 AM »
umeshk
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My Big Beaver now Almost Ready to FLy...

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« Reply #12 on: August 09, 2012, 12:03:54 PM »
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your motor is capable of only upto 3Cell,
1. 1800mah 3S will keep the weight down and give you enough power,

2. what i am curious about is your pull-pull, change over to a cobblerís thread instead of this steel wire.

3. also change your 'Z' bend on the elev, the bend isn't clean. It will slip in when moved.

PS
Who is maidening? depending on who might have some tips (Since i own TT Beaver)
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« Reply #13 on: August 09, 2012, 12:10:58 PM »
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That's a big one! All the best for the maiden.

Do you have any pictures at all for the hot wire process? I have some blue sheets lying around but haven't dared slicing them for fear of destroying them. They are in 25 mm and 50 mm thickness and I want to slice them into 5mm sheets.Your help will be appreciated.
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« Reply #14 on: August 09, 2012, 12:18:01 PM »
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Completely agree with rcpilotacro. Better straighten up the z bends before you maiden her or else you are asking for trouble. This baby is going to smash into a few pieces on impact. Here are two videos that may be of help:



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« Reply #15 on: August 09, 2012, 12:37:54 PM »
umeshk
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Thanks VC for the wishes..
Unfortunately I didnt keep a picture log of the build but you can find a lot of resource on youtube for slicing...
I used the thinnest guitar string which is a nichrome wire and power supply from the transformer of my old stereo system. Marked 6mm  on either sides along the length of a 50mm sheet and screwed two long strips of wood ( for guide ) on either sides. Tied curtain hooks for grip on the ends of the wire and applied power. that was the easiest I could device. Youll need to sand it for a uniform finish ( the reason for 6mm marking insted of 5 )
I carved out the airfoils using the same technique ... .. though one wing was destroyed in the learning process..
believe me , once youve mastered the technique .. its the easiest and an instant method to make airfoils..
My best wishes ... go ahead coz 5mm sheets was impossible for me to find.. and if you slice a 50mm youll have loads of foam to work with..

Umesh
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« Reply #16 on: August 09, 2012, 12:49:04 PM »
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nice build @umeshk

@rcpilotacro and @vc - I feel the z bend seems to be just ok on the servo side (just the bend), the linkage to the control rod surely has a high chance to slip (unless changed or at the least glued). Were you pointing at that? I could not notice any z bend on anycontrol horn on the elevator surface, or did you mean the z bend is too wide for the hole on the servo arm and will slip within. I know I've just confused what I'm trying to say so here's a picture. Let me know if I'm missing something. Sorry if I'm being dumb but unless I ask, I'll remain dumb. Cheesy


I agree with the wire on the rudder/tailwheel servo, it might just flop when pushed.



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« Reply #17 on: August 09, 2012, 12:53:37 PM »
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the bend will slide into servo horn if doesn't have clean 90 deg, also the bottom bend should not be too long either. Umesh, i also noticed you rudder hold down servo screw is missing. did you just keep it there put some glue and thought it will do? i suggest screw it in Wink
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« Reply #18 on: August 09, 2012, 01:01:51 PM »
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Aha! I see what you mean.
+1 on the screwing it in. healthy for the servo as well, keeps it aligned.
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« Reply #19 on: August 09, 2012, 01:30:32 PM »
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a screw or two is always healthy Wink

PS
since the whole thing deals with your beaver topics merged
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« Reply #20 on: August 09, 2012, 04:21:40 PM »
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I feel it would be little tough to get CG right.....might have to add lot of weight along with motor.
Try putting a iron sheet as motor mount rather than adding other weights it will give strength and weight both!!!!
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« Reply #21 on: August 09, 2012, 04:49:51 PM »
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Thanks rcpilot, VC, Girish and  guys for the help and suggestions ...
The wire for the pull pull is thin steel wire with vinyl insulation . Its a very tough wire for its thickness , is used for semiprecious jewellery bead strings.. I could save a few grams but the wire was too thin for the push rod stopper so I has to attach small wire pcs at the end.. any suggestions ??

I am surely going to screw the servos and replace the wire holding bamboo pushrod with a piano wire . I didnt have one and I was in such hurry to test my setup that I used whatever was available ( A hair clip ) . Thanks for sharing the Z band clip. Please check the Z band and servo positions for ailerons and advice.

I couldnt find anyone in Jaipur for the maiden and I haven flown anything in my life except paper planes. So I am looking for some used autopilot and  a simulator.

once again thanks for your valuable suggestions...

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« Reply #22 on: August 09, 2012, 05:00:36 PM »
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Thanks Saurabh...
where exactly should be CG.. Should it be 35% from  LE..
The chord is 7.5" .. is 2.6"OK  ??
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« Reply #23 on: August 09, 2012, 07:09:58 PM »
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CG at 20% Chord, autopliot and such gizmos wont do, i hate to see this beauty crashing. get someone experienced to maiden this beauty
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« Reply #24 on: August 09, 2012, 10:14:49 PM »
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Gusty Boss, why for this plane CG at 20% against 35%?Huh? did not understand???

If its 20% then its more problem setting CG.... Umesh I tell  you, you've done fantastic job on this plane.
want to advice a few points......
1. Do not be in hurry to fly this plane - no matter what .....
2. The plane built is very good BUT the structure and material will NOT sustain even a slightest of jerk & it will be into pieces.( no spar in wings or wooden support in fuse....in-fact your motor mount should have been a block of foam with screw studs to fix plywood)
3. In worst case be prepared for it
4. As i see youve invested into getting horns, clevis etc.... don't do a "chalta hai" job with control rods and z bends
I have searched and waited for these things a lot..... go to tirpolia bazar cornor shop when you turn from chaura rasta to tirpolia ( towards choti chopar) {other will not understand what i am writing } there is a hardware shop which sells only wires ask him to give you steel wire used for pulling electrical wires inside contudes (in a new house construction). and he will give you the control rods !!!!!!!!!! (steel wire 0.8mm dia).
5. Dont let them lose in fuse ... use a empty refill to guide them by sticking small piece os refill on the fuse base. This will give them some guide and restrict stray movements.
6. Check , counter check & again check CG {most important} see videos on how it should be..
7. Find a experienced person to fly.....or atleast who knows how these things can fly...... you would be surprised to see what we normally think on how to use TX sticks actually the movements are just like pulses to control surfaces very slight movements... any first flyer would make mistake and over control the elevator or aerilons.
8. Knowing this much and making a good ( as people say) scratch model I could not fly my own plane for more than 20-30 sec when I took it in mid air... it is tough for first timers.
8. I am sure once you crash it you will lose interest in this hobby by not getting any o/p after so many efforts.
wait and try improvising search material and means to strengthen it.

OR if you think it is possible ..... keep this plane as it is ... make yourself a smaller plane ( make some thing like a chotu SPAD (search in this forum or ATOM from HK) experiment and learn how to fly then take onto your big plane.
At first this may look weird advice but trust me it will let u have fun with your plane.....
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