beyondforce

Hi guys,

I'm new to building R/C planes (but not to aviation - I'm a pilot). I need help with selecting the right motor and prop.
The plane min. specs:


Motor: Pusher
Total Weight: 1.5 - 2.5 kg
Wingspan: 2000 mm
Flying style: Slow flying


I look forward to your guldens.


Cheers/Beyondforce

jaka

Hi!
It all depends what type of airplane it is? "Slow flying" can mean different things to different people. Any pictures?
But a guess is: 3,5cc -6,5cc engine depending on what type of plane you have and the low wing loading you wanted.
9x4 APC for 3,5cc (.21) engine, 10x4, 10x5 or 11x4 for a 4,6cc (.28) and 11x5-11x6 for a 6,5cc (.40 ) engine.
APC , RAM and Graupner G-Sonic makes the best "props" on the market, the last two brands in some cases better than the APC.

beyondforce

Thanks, I going to build surveillance drone. But first, I need to make a proof of concept.
Since I'm new to RC planes, I need to know which motor I should start with. I need a motor with enough thrust, which can handle around 2 kg plane (maybe more).

jester_s1

There are many well proven designs out there. Check them out and see how they are powered. No good innovator starts out with nothing but an idea. They all use the knowledge that's already been gained.

Most drones are electric to reduce vibration. It's possible to have wet power for a camera plane, but you'll have to build a vibration dampening mount for your camera and probably soft mount the engine too. That's a pretty big engineering hurdle by itself, not to mention the extra weight.

jaka

Hi!
Have you flown an R/C plane before?

beyondforce

A real airplane counts? I'm a Pilot.

JollyPopper

My Feedback: (6)

The general consensus over the years has been that almost nothing from flying real airplanes translates to flying radio controlled models.

beyondforce

I see where you are going with it. I guess the way to know, how I will handle an RC plane

jaka

Hi!
Sorry! But if you only have flown full size airplanes before you are not going to be able to fly an R/C plane.
To fly an R/C plane is a little bit trickier.

Insanemoondoggie

Get a simulator, it's a great teaching tool and you can experiment with many different options.

jaka

Hi!
A simulator is fine but could not be compared with "the real thing". You need a high wing trainer and time (a year or two) to be capable of flying an R/C model... safely.

beyondforce

I am planning on building an electric plane!

jester_s1

Electric is standard for camera carrying planes. You'll still need the piloting skills, and being a full scale pilot doesn't qualify you for that. It may help, but RC flying and full scale flying are not the same. Start with a trainer plane and get an instructor. Then move on to better performing planes that are designed ofr carrying cameras.

The drone craze has created a new kind of RC hobbyist that most of us believe are detrimental to the hobby. It's the guy who wants the plane and wants to see it fly, but doesn't want to learn anything about how to fly it. I'm not saying that's automatically you understand, but it does look like there is a tinge of wanting to skip the training process and get into the air as quickly as possible. The flight controllers that have come out in recent years have made it possible for people to fly with basically no skill at all, which is fine until something goes wrong. For responsible piloting, you need flying skills. Don't skip that process just to try and save some money and time. Enjoy learning and challenging yourself. Then when you have good control skills, put any plane you want to in the air.

mikeyost12

Just out of curiosity, I just bought a Goldwing Suhkoi, running it on a Saito 180..... What size prop would be suggested for that size motor and that plane?

jaka

Hi!
A 17x8 18x6

kmeyers

I went to Tower hobbies site and found a 2 meter electric sailplane here is what they list:

This is the Radio Controlled, Brushless Electric Powered,Almost Ready to Fly Vista BL Sailplane from Tower Hobbies.
[TABLE="width: 100%"]
[TR]
[TD="bgcolor: #f0f0f0"]FEATURES[/TD]
[/TR]
[/TABLE]
Construction: Built-up balsa and ply, prehinged tail surfaces and
factory installed control horns, spacious interior for installation
of standard or micro servos
Wing: One-piece with plywood wing joiner, wing attaches to fuselage
with #64 rubber bands
Covering: High-quality heat-shrink film
Motor: Factory installed 1000kV brushless
ESC: LiPo compatible 30A
Propeller: 12x6.5" plastic two-piece folding design
Spinner: Plastic, black in color, 2" (51mm) diameter_
Battery Hatch: Quick access under wing
Warranty: Tower Hobbies guarantees this kit to be free from defects
in both material and workmanship at the date of purchase. This
warranty does not cover any component parts damaged by use or
modification.

[TABLE="width: 100%"]
[TR]
[TD="bgcolor: #f0f0f0"]INCLUDES[/TD]
[/TR]
[/TABLE]
ARF Vista BL Sailplane with Propeller, Spinner, #64 Rubber Bands,
ESC, Brushless Motor, Prop Adapter, Decals, Instruction Manual

[TABLE="width: 100%"]
[TR]
[TD="bgcolor: #f0f0f0"]REQUIREMENTS[/TD]
[/TR]
[/TABLE]
Radio: 3-ch minimum (elevator, rudder and ESC control)
Servos: Two standard or two mini with at least 35g of torque
Battery: 3S 11.1V, at least 1800mAh
Charger: To match selected battery
LiPo charge bag
Building and field equipment

[TABLE="width: 100%"]
[TR]
[TD="bgcolor: #f0f0f0"]SPECIFICATIONS[/TD]
[/TR]
[/TABLE]
Wingspan: 78.5" (1995mm)
Length: 41" (1040mm)
Wing Area: 678 sq in (43.7 sq dm)
Wing Loading: 7.5 - 8.0 oz/sq ft (23-24 g/sq dm)
Airfoil: Flat bottom
Center of Gravity (CG): 3-1/8" (80mm) back from the leading edge of
the wing measured at the fuselage sides
Control Throws: High Rate Low Rate
Elevator Up & Down: 5/8" (16mm) 3/8" (9.5mm)
Rudder Right & Left: 1-1/2" (38mm) 1" (25mm)

jxs 09/02/14

ir/jxs

This is very close to what you may start around.

jester_s1

mikeyost12- It's considered bad etiquette to ask an unrelated question in someone else's thread. You should start your own thread about your Sukhoi.