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Old Mar 25, 2011, 09:45 AM
Just shut up and build!
Sri Lanka
Joined Mar 2010
652 Posts
Help!
What radio gear from Hobby King for a 20 inch (40 cm) Cessna 180 type model?

I have been looking for radio gear for a first model,
For example this model: http://www.rcgroups.com/forums/showthread.php?t=841748

http://www.hobbyking.com/hobbyking/s...idProduct=9042

So far I have located the following on the Hobby King web site:

TX and RX

HobbyKing 2.4Ghz 6Ch Tx & Rx V2 (Mode 2)(THROTTLE ON THE LEFT)

Servos: Hobby King 3.7g / .4kg / .10sec Micro Servo

What battery ESC and motor should I use?
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Old Mar 25, 2011, 12:23 PM
Power Wheels Guru
UNGN's Avatar
Southlake, TX
Joined Jan 2008
7,327 Posts
Quote:
Originally Posted by knlever View Post
I have been looking for radio gear for a first model,
For example this model: http://www.rcgroups.com/forums/showthread.php?t=841748

http://www.hobbyking.com/hobbyking/s...idProduct=9042

So far I have located the following on the Hobby King web site:

TX and RX

HobbyKing 2.4Ghz 6Ch Tx & Rx V2 (Mode 2)(THROTTLE ON THE LEFT)

Servos: Hobby King 3.7g / .4kg / .10sec Micro Servo

What battery ESC and motor should I use?
5g HXT Brushless
GWS 5030 or 6030 prop
Plush 6A ESC
350/360 2S battery
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Last edited by UNGN; Mar 25, 2011 at 08:23 PM.
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Old Mar 25, 2011, 07:02 PM
Just shut up and build!
Sri Lanka
Joined Mar 2010
652 Posts
Thanks but I need more specifics. Is this ok?

C1818 Micro brushless Outrunner 3500kv (9g) $9.99 9g

http://www.hobbyking.com/hobbyking/s...idProduct=5377


TURNIGY Plush 10amp 9gram Speed Controller

http://www.hobbyking.com/hobbyking/s...idProduct=4204

GWS prop

GWS EP Propeller (DD-5030 127x76mm) (6pcs/set)

http://www.hobbyking.com/hobbyking/s...dProduct=10033

Rhino 360mAh 2S 7.4v 20C Lipoly Pack

http://www.hobbyking.com/hobbyking/s...idProduct=7301
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Last edited by knlever; Mar 25, 2011 at 07:18 PM.
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Old Mar 25, 2011, 11:04 PM
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flashkick's Avatar
United States, UT, West Jordan
Joined Dec 2008
2,531 Posts
that speed control is overkill. the turnigy plush 6amp is plenty. and the hxt 5gram motor is also great.
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Old Mar 26, 2011, 06:19 AM
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Sweden, Västra Götaland, Partille
Joined May 2009
493 Posts
"What radio gear from Hobby King for a 20 inch (40 cm) Cessna 180 type model?"

Is it 20 inch or 40 cm?
20 inches is 50.8 cm, its quite a difference at this scale.

Regards/

Tommy
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Old Mar 26, 2011, 09:31 AM
Just shut up and build!
Sri Lanka
Joined Mar 2010
652 Posts
20 inch, 50 cm careless again, sorry

UNGN, thanks for the updated links, nice motor and esc, nice price

Just to confirm the charger: http://www.hobbyking.com/hobbyking/s...idProduct=7637

I can use my own dc adapter? Any concerns about the quality of the DC output - noise, voltage fluctuations etc?
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Last edited by knlever; Mar 26, 2011 at 09:37 AM.
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Old Mar 26, 2011, 12:43 PM
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UNGN's Avatar
Southlake, TX
Joined Jan 2008
7,327 Posts
I use a DC power supply from an external hard drive. As long as you don't try to charge batteries at an Amp-hr rate greater than the power supply, you'll be fine.

This is only a concern with really large batteries.
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Old Mar 26, 2011, 06:48 PM
Just shut up and build!
Sri Lanka
Joined Mar 2010
652 Posts
Thanks. The Hobby King receiver weighs 13g according to this:

http://www.rc-radiocontrol.com/hobby...eceiver-6ch-v2

Whatever I get, weight has to be within the ranges specified below for trainers. Or I could calculate wing cubic loading of a model that flies slowly enough.

The Cessna 170 at the bottom of the page weighs in at 86g and has a span of 24 inches. Assuming a wing area of 24 x 4 = 96 inches and the weight of 3 ounces, plugging it into the calculator below gives a cubic loading of 5.5 and wing loading of 4.5 oz per sq in / 13.5 oz per sq dm and it flies slowly. Keeping this cubic loading for my model should give the same sort of slow flight.


Cubic wing loading calculator

http://www.ef-uk.net/data/wcl.htm
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Last edited by knlever; Mar 26, 2011 at 07:16 PM.
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