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« on: February 28, 2018, 09:08:43 AM »
Sreekumar VR
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Hi everyone, I'm new to this field. I'm building an RC plane. The motor I'm using is Avionic 1350kv. As per it's test results, it provides 790 gm pull when using 8x6 propeller. My model weights around 650gm. Can I have a perfect flite ?
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« Reply #1 on: February 28, 2018, 09:22:14 AM »
kiran rc
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What type of model are you building? For a typical trainer model the ratio of T/w can be low.
However, your setup has more than 1:1, so it should be good to go at half the throttle.Thrust to W ratio depends upon several factors, especially the Aerofoil/ wing design.
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« Reply #2 on: February 28, 2018, 10:46:41 AM »
Sreekumar VR
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My model is builded with 2mm balsa and thermocol, it is in the building stage, not yet completed.. here is the picture

IMG_20180228_104353_931.jpg
Re: Thrust to weight of an RC plane
* IMG_20180228_104353_931.jpg (59.29 KB, 800x602 - viewed 142 times.)
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« Reply #3 on: February 28, 2018, 10:51:49 AM »
Sreekumar VR
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What type of model are you building? For a typical trainer model the ratio of T/w can be low.
However, your setup has more than 1:1, so it should be good to go at half the throttle.Thrust to W ratio depends upon several factors, especially the Aerofoil/ wing design.

Thanks for the valuable information
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« Reply #4 on: February 28, 2018, 12:06:04 PM »
AL HAM SHARI
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Nice plane btw,
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« Reply #5 on: February 28, 2018, 12:50:45 PM »
Sreekumar VR
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 :)tnx
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« Reply #6 on: February 28, 2018, 01:17:16 PM »
Karthick Ashwath
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For a trainer plane, the thrust ratio is definitely more than enough. Grin
If you want to know more about this, check out K K Iyer's Tech Talk.
http://www.rcindia.org/electric-power/iyer's-tech-talk-how-much-power/
Hope it helps!
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« Reply #7 on: February 28, 2018, 01:37:19 PM »
Sreekumar VR
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 Salute
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« Reply #8 on: February 28, 2018, 06:51:19 PM »
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Nice framework there in your plane buddy.  Smiley

I agree to the earlier comments. With your setup you shouldn't have any problems if it flies within a trainer portfolio.

Edit: Do you plan to post a build log of your build?  Drool
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« Reply #9 on: February 28, 2018, 09:44:37 PM »
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Sure, I'll upload it soon.. Thank you
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« Reply #10 on: March 14, 2018, 07:21:15 PM »
Sreekumar VR
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My newly designed Dream flier D16, finishing awaited..

IMG_20180314_191857_581.jpg
Re: Thrust to weight of an RC plane
* IMG_20180314_191857_581.jpg (38.8 KB, 800x450 - viewed 78 times.)
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« Reply #11 on: March 14, 2018, 07:50:24 PM »
AL HAM SHARI
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Great
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« Reply #12 on: March 14, 2018, 08:48:59 PM »
K K Iyer
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My newly designed Dream flier D16, finishing awaited..

Don't add finish (ie, weight) now. Wait till after test flight.
Remember a golden rule: Simplify and add lightness!
Best of luck.
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« Reply #13 on: March 16, 2018, 09:53:34 PM »
Sreekumar VR
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Now I'm little tensed, it weighs 750g now.. Everything fixed, motor thrust 790 g.. How my plane behaves in air,? TTW ratio 1.05. Please reply

IMG_20180316_220253_444.jpg
Re: Thrust to weight of an RC plane
* IMG_20180316_220253_444.jpg (64.51 KB, 749x515 - viewed 64 times.)
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« Reply #14 on: March 17, 2018, 08:17:22 AM »
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Thrust thrust thrust!

Forget this obsession!

Look first at wing-loading & wing cube loading! Consider the type of model - glider, trainer, aerobatic, pattern, 3D, scale

That will tell you how your model will behave in the air. Accordingly decide your thrust/weight requirement
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« Reply #15 on: March 17, 2018, 08:49:59 AM »
prabal276
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@ Sreekumar VR
As Sanjay sir said, do not worry about the thrust
 If that plane is built well, it will fly well.
Some of my smaller planes used to fly excellent with a T/W of 0.75
Fly it first
Do check the wing loading.
Please post your plane's dimensions and AUW weight.
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« Reply #16 on: March 17, 2018, 08:58:24 AM »
Sreekumar VR
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Here is the details,

IMG_20180317_085006_948.jpg
Re: Thrust to weight of an RC plane
* IMG_20180317_085006_948.jpg (21.83 KB, 800x415 - viewed 54 times.)
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« Reply #17 on: March 17, 2018, 09:02:25 AM »
prabal276
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Well, looks like your plane will be a Hotshot. It will need atleast 60-75% throttle all the time. It will be fast. The wing loading is quite high for a trainer.

IMG_20180317_085405.jpg
Re: Thrust to weight of an RC plane
* IMG_20180317_085405.jpg (33.2 KB, 433x277 - viewed 38 times.)
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« Reply #18 on: March 17, 2018, 09:06:07 AM »
Sreekumar VR
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Wing dimensions..

IMG_20180317_090242_519.jpg
Re: Thrust to weight of an RC plane
* IMG_20180317_090242_519.jpg (60.01 KB, 450x800 - viewed 23 times.)
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« Reply #19 on: March 17, 2018, 09:11:44 AM »
prabal276
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There you go:
The plane will fly fast and be quite aerobatic in nature. You'll have to fly it these are only predictions. Make a new one if you area beginner. Probably a FT Old Fogey.

What airfoil is it?

Screenshot_2018-03-17-09-03-37.jpg
Re: Thrust to weight of an RC plane
* Screenshot_2018-03-17-09-03-37.jpg (67.43 KB, 450x800 - viewed 18 times.)
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« Reply #20 on: March 17, 2018, 09:26:56 AM »
Sreekumar VR
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I used 2mm balsa used for fuselage, and wing frame, covered with paper coated thermocol sheet, (sanded).
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« Reply #21 on: March 17, 2018, 09:30:40 AM »
prabal276
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I am asking about the Airfoil.
Please tell the Airfoil type.
You made it by hand but you may have used some shape for reference. I want to know that shape. I.e CLARK-Y,  NACA etc.
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« Reply #22 on: March 17, 2018, 09:38:21 AM »
Sreekumar VR
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This is a miniature of piper arrow.. And I referred it's airfoil, given below

images (2).jpg
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« Reply #23 on: March 17, 2018, 09:45:10 AM »
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Well,
Looks like a symmetrical Airfoil.
That plane is a fully aerobatic sport plane. Will be very agile. With throttle, the speed will increase and to gain altitude, you will need to increase AoA. Completely opposite to a trainer.
It also looks as if you did not do the research before building the plane. If you would have, you wouldn't have put a symmetrical airfoil.
Can you make a bigger wing? With a flat bottom Airfoil perhaps?
Or build a tested beginner plane like the FT simple Cub or the FT old Fogey.
Keep the plane for later. Perhaps, when you are more experienced.
Regards
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« Reply #24 on: March 17, 2018, 09:55:58 AM »
Sreekumar VR
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Ok, sir. Let me do a test flight with this model.. I hopes something good..  Do you think this model is OK??  Huh?
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