RC Groups

RC Groups
    Electric Motor Design and Construction
        Discussion want to build a 24 inch plane

#1 romanxdsouza Aug 31, 2012 06:07 PM

want to build a 24 inch plane
 
hi guys,im new to rc airplanes want to build a 24 inch plane slow stick,for easy transport dont want to go bigger in size,need plans with sizes for fuse,wing.elev, rudder,wing post,dihedral PLEASE HELP GUYS
ive got a, futaba transmitter t6ex and a r6106hf futaba recievers Size: 0.85 x 1.53 x 0.48" (21 x 39 x 12mm)
Weight: 0.24 oz (6.7g)
Voltage Range: 4.8 - 7.4V

motor Brushless motor BLM5055-8T 0.4 kg static thrust (with 8x6er propeller)
100W power class (9A / 3S)
Hochweritge Koyo or SKF
Complete with drivers, installation material and 3.5 mm gold plated plug
Tremendous torque
Weight: 29g
1360 RPM / Volt ,-,

esc -Magic Seed Brushless ESC 18 A,Dimensions: 34 x 22 x 7mm
Weight: 18g

, flight battery SLS APL 2200mAh 2S 7.4V 30C +60 C TRX

#2 C₄H₁₀ Aug 31, 2012 06:46 PM

The gear you have is quite large for a 24" plane unless you don't mind it being rather heavy and fast. You'd probably need a minimum of a 7" prop to get any useful power out of the motor on 3S, which is almost a third of the target wingspan.

Take this plane, for example. It's got a 22" span and weighs 3 ounces. It has a ten-gram motor swinging a 4.5" prop, 250mAh 2S lipo, and a 6A ESC. It's small and slow enough to fly in a small park, but only barely.

http://static.rcgroups.net/forums/at...rret%20010.jpg

#3 jackerbes Aug 31, 2012 09:50 PM

I think that is a 270 gram 1500 Watt motor, I don't think a 24" wing span is going to be enough airplane to fly that motor.

http://www.modellbau-berger.at/antri...b202/index.php

Jack

#4 MagnusEl Sep 01, 2012 02:25 AM

The one he have is probably this: BLM2822-27T
I agree with C₄H₁₀, too heavy motor for such small plane.

#5 jackerbes Sep 01, 2012 07:41 AM

OK, the 29 gram motor might be OK for a Blu Baby 24, the part drawing for that can be seen here:

http://www.rcgroups.com/forums/showa...0&d=1209747379

With that much power I would go with the stronger 24" KFm2 wing and the plans for that are here:

http://www.rcgroups.com/forums/showa...4&d=1220529756

And post #1 here has some other plans for the BB 24:

http://www.rcgroups.com/forums/showt...hp?t=%20681556

Jack

#6 romanxdsouza Sep 02, 2012 06:37 AM

thanks for your replies ,how about this plane guys .simple split stick
http://www.rcgroups.com/forums/showthread.php?t=254490

yes magnus the motor i hav is BLM2822-7T,http://www.modellbau-berger.at/antri...2530/index.php

carbon prop 6.5 x4,http://www.wiredrc.com.au/shop/prope...propeller.html,

battery- http://www.stefansliposhop.de/liposh...-trx::951.html

ESC- it is the Magic Seed Brushless ESC 18 http://www.simprop.de/Seiten/Modellb...Speed10_18.htm

servos- http://www.servodatabase.com/servo/jamara/5g-digi

#7 jackerbes Sep 02, 2012 07:05 AM

The motor you have might still be a bit much for that SSS build. That has a 3 oz./85 gram AUW and in that build used a 12 gram GWS reduction gear drive. That drive had an input power of 5 to 7 Watts or so. Your 29 gram motor will be be about twice as heavy and 7 to 10 times as powerful.

If you scale up the components (wing thickness, fuselage stick size, servos, battery, etc.) to better match your motor it would probably work.

Jack

#8 romanxdsouza Sep 02, 2012 07:16 PM

should i give it a try jack im going to use v shaped dihedral for wings,and wing post like the hangar rrat,im worried abt the battery weight ,what u mean by" scale up the components "" pls advise im new in the field,

#9 romanxdsouza Sep 02, 2012 07:24 PM

only option left besides sss is gws slow stick.problem is im workining on a cruise ship need to travel with the plane every trip once built,so need somthing easy to travel with especially with security level these days,tgats why was planin on 24 inch wing

#10 jackerbes Sep 02, 2012 09:49 PM

Quote:

Originally Posted by romanxdsouza (Post 22623088)
only option left besides sss is gws slow stick.problem is im workining on a cruise ship need to travel with the plane every trip once built,so need somthing easy to travel with especially with security level these days,tgats why was planin on 24 inch wing

To scale it up would be to make all the parts proportionally larger. A 24" wingspan plane scaled up to a scale of 1.5:1 would become a 36" plane as an example.

It you strengthen the wing and fuselage it might work with your motor. I was just thinking that at 85 grams the materials might not be strong enough to handle the weight and flying stresses.

I can understand your concerns about portability with your job and the desire for it to be more portable.

If a flat, more rectangular form would be easier to store and transport you might want to consider a flying wing like the Divinity 42. That would store in an area that is about 12" x 44" and just 2-3" thick. And your motor would be a good choice for that plane:

http://www.rcgroups.com/forums/showthread.php?t=1023254

Can you fly already? The Divinity will fly slow and and is a very stable flyer too. If you have a little flying experience it will not be too difficult to fly. It would not be quite as easy for a new pilot to fly as the SSS or a smaller slow stick.

Jack

#11 romanxdsouza Sep 03, 2012 01:56 AM

never flew b4,looking to build a stick planes basicly and slow flyers.the electronic i pickd were from germany,should hav gone lighter.what u thing abt d GWS slow stick may hav to go to a 48 inch wing i think ive got the plan

#12 jackerbes Sep 03, 2012 07:47 AM

Quote:

Originally Posted by romanxdsouza (Post 22625609)
never flew b4,looking to build a stick planes basicly and slow flyers.the electronic i pickd were from germany,should hav gone lighter.what u thing abt d GWS slow stick may hav to go to a 48 inch wing i think ive got the plan

The slow stick is a good choice for a slow flyer like the SSS. The SSS as you posted the link to it is really more of an indoor plane. Or course you can fly it outdoors but outside you really need a day with no more than a breathe of air moving.

The SS is sold in 46" and 37" wing spans but you can build it in almost any size. I build a clone of the SS I called the KFoenix Stick that had a 48" Kline-Fogelman wing:

http://www.rcgroups.com/forums/showthread.php?t=1408747

You can get the square sticks in wood, fiberglass, CF and various sizes like 8mm, 10mm square. If you want to build to a smaller size for better portability it is not too difficult.

Your motor should work fine for a 48" or so SS build. It will have about 50-70 Watts of power will work well with slow flyer and park flyer type planes like the SS up to about 500-600 grams or so

If you have a plan and want to change the size, post it here or post a link to where it is. Maybe it can be resized to what you want to have.

Jack

#13 romanxdsouza Sep 03, 2012 08:39 AM

hey hi jack,this is the plan i found for the slow stick its neat,but i find the fuse 2 big and cant figure out the wing post sizes scroll down the page there is a drawing of fuse and wing post http://www.wattflyer.com/forums/showthread.php?t=16392

#14 romanxdsouza Sep 03, 2012 08:41 AM

i tried all electronics one servo dosent seem to be working now,tried on all channels on reciever

#15 jackerbes Sep 03, 2012 09:36 AM

1 Attachment(s)
Quote:

Originally Posted by romanxdsouza (Post 22627046)
hey hi jack,this is the plan i found for the slow stick its neat,but i find the fuse 2 big and cant figure out the wing post sizes scroll down the page there is a drawing of fuse and wing post http://www.wattflyer.com/forums/showthread.php?t=16392

Is that the drawing I have attached? It that what you want to use?

Jack


All times are GMT -5. The time now is 12:25 PM.