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« on: July 17, 2012, 05:03:01 PM »
SideWinder
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I wanted to make a YAK 54 3s 12" approx size plane, but im confused about the specs required?

http://www.genebond.rchomepage.com/plans/yak54-36%20full.PDF

I have reduced the plan to 29%.
Im going for a small size becoz of space constraints, have to travel a lot to fly my shikra.

What i have in mind is

7.4V 350mAh 2cell,Approx Weight (g): 22.0

2812 Brushless Motor 1600KV,Max watt (W): 103,Thrust: 470g, Weight (g): 22

Speed Controller 18 amp, Weight: 18g

9g Micro Servo, approx-45-50 gms

and rest of the auw would include the cf tubes, body, connectors,Rx etc

so total auw im expecting around 200-250gms.

Is the setup feasible for 3d?
What size prop should i use with that motor?

Most of the items are from AEW
http://www.aeroworks.co.in/index.html.


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« Reply #1 on: July 19, 2012, 01:17:54 PM »
SideWinder
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any help?
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« Reply #2 on: July 22, 2012, 02:41:48 PM »
topalle
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there are many websites with calculators...pls. use them
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« Reply #3 on: July 22, 2012, 05:18:47 PM »
rastsaurabh
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I have reduced the plan to 29%.
Suggest to go for min 18Inch


7.4V 350mAh 2cell,Approx Weight (g): 22.0 (OK)

2812 Brushless Motor 1600KV,Max watt (W): 103,Thrust: 470g, Weight (g): 22
Suggest this- AX 1806N 2500kv Brushless Micro Motor (19g)
Less amp motor for longer flying and reduce weight on low amp ESC

Speed Controller 18 amp, Weight: 18g
For the above motor 10Amp ESC reqd

9g Micro Servo, approx-45-50 gms
Will be too big for a 12" or 18 inch Plane ( have alook at planes on Hobby king they give wing span with servos)

and rest of the auw would include the cf tubes, body, connectors,Rx etc
Need to see the RX weight & the pushrods the push rod stopper is also a weight....

so total auw im expecting around 200-250gms.

Is the setup feasible for 3d?
What size prop should i use with that motor? 5x3 Prop

Most of the items are from AEW
http://www.aeroworks.co.in/index.html.
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« Reply #4 on: July 23, 2012, 11:06:10 AM »
SideWinder
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@ Topalle PLEASE let me know exactly which calculators are you talking about, most of the ones i found are either too complicated or inadequate.

@ Saurabh

Why do you suggest 18"? Any particular reasons?
I would really like to stick to small size, unless its completely unfeasible.

The motor you referred generates a thrust of  225g (6.4A ,5X3 prop), since im building a 3D plane, thrust to AUW ratio should be 2:1 as far as I read.

And about the 9gm servos, becoz i thought it may become a head heavy plane and pitch down and also becoz the servos smaller than this one have micro JST connectors which cant be connected to Hobby King 2.4Ghz Receiver 6Ch V2 (13grams).

My primary concern using my motor was torque roll, otherwise it seems to be fit.
And i havent understood the concept of wing loading, how to calculate wing area, if someone can point me in the right direction, would be really helpful.

EDIT:
I found the answer about wing area / wing loading,

http://www.airfieldmodels.com/information_source/math_and_science_of_model_aircraft/formulas/straight_tapered_and_delta_wing_area.htm

http://www.airfieldmodels.com/information_source/math_and_science_of_model_aircraft/formulas/wing_loading.htm


« Last Edit: July 23, 2012, 01:29:18 PM by SideWinder » Logged
 

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« Reply #5 on: July 23, 2012, 02:28:37 PM »
samlikespad
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SideWinder, The original GeneBond design for a 30" yak54 has a recommended AUW of 7 to 8oz which is somewhere close to the weight you have in mind. Now, even without using any calculator, you could see that the wing loading will be way too high when you reduce the original plan but with with the same AUW of the bigger plane. I have built both the 30 and the 36" versions of this design and really enjoy flying them to learn 3D. A 30" is not that big a size to carry around in a car.

9g servos are recommended for the 36" version while 5g is recommended for the 30" size. Your 12" to 24" range requires micro motors/esc/servo combos to keep the AUW to the minimum.  Good luck with the build!
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