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Old Nov 13, 2009, 11:05 AM
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Belgium
Joined Oct 2006
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Drawing and designing a cessna 182 in Rhino

Hi,

I've started drawing a cessna 182 skylane in Rhino.
The 3D model is now finished. The nose still looks a bit weird and there is still
a bulb on the fin but I'll take care of that later.
First things first. As I do not really have a lot of experience in designing my own airplanes, I hope some of you can help me a bit.
Eventually I want to use this airplane as a trainer.
This is what I have so far:

Wing profile: NACA 2412
Angle of attack: 2.1°
wing dihedral: 1.6°
Fin and stab profile: NACA 0009
Angle of attack for stab: 0°
Wingspan: 1570mm (scale 1/7)

Hope these are good choices?
Are the angle(s) of attack and wing dihedral well chosen?

Considering this size, what would be a good electric setup (Lipo: 3 or 4 cells or more? at what capacity (mah) to give descent flying times).
Offcourse this can be estimated.

If some of you could help me to get this information right, I can adapt the 3D model and start drawing.
This is what I have so far:
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Last edited by Matd; Nov 13, 2009 at 06:40 PM.
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Old Nov 13, 2009, 06:55 PM
Registered User
Belgium
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By the way, is this the right subforum to post this thread?
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Old Nov 14, 2009, 03:21 AM
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East Anglia, UK
Joined Sep 2002
29,688 Posts
yes, this is the place.

Everything looks fine to me: with that dihedral ailerons mandatory, though it will probably turn on rudder also.

I'd take cross sections and re-loft that nose..

Its a straight 61" but you will probably be sheetng, so I would say it will be in the 3-5lb weight area, so 200-300W is probably about right for trainerish behavior.

Id go for 3s 3000 or 4s 2000 as the power pack. Sort of 20A-30A
KV around 800 (4s) to 1100(3s) prop around the 10x7 or 11x7 mark.

I've got a suitable engine drawn up somewhere..AXI 2826 IIRC.

Use that to get your bulkheads about right.
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Last edited by vintage1; Nov 14, 2009 at 03:35 AM.
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Old Nov 14, 2009, 04:24 PM
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Belgium
Joined Oct 2006
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Wow nice drawing, indeed usefull to draw up the bulkheads.
Thanks for the info!
The other cool thing is that I've just finished my home built lasercutter, so eventually this airplane will be laser cut.
At the moment, I'm building the Spitfire MKIX by Dave Philpotts as a "test" for what the laser can do. So far so good
I'll keep posting screenshots from the drawing.
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Old Nov 14, 2009, 08:07 PM
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Haole's Avatar
Hawaii
Joined Dec 2007
571 Posts
Sweet, another Rhino user! ...subscribed.

Carl
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Old Nov 14, 2009, 10:05 PM
It actually Flies!
Float Flyer's Avatar
Salmon Arm, British Columbia, Canada
Joined Feb 2006
548 Posts
It's looking good. Spend the extra time to get the nose right. You will find it makes it worth while. There is a fair amount of complexity in the C-182 nose bowl and good training. I still don't have my Jetliner nose perfect, but I am really glad I spent the extra time on it....

Keep goin' !!

FF
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Old Nov 15, 2009, 07:16 AM
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Belgium
Joined Oct 2006
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indeed probably a good idea to reloft the nose but it's not easy on this cessna.
For those curious or interested: here's a movie of the laser cutting some plywood (3mm).
I'm working on a fume extractor.
MOV04049 (1 min 41 sec)
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Old Nov 16, 2009, 03:14 PM
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United States, CO, Littleton
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Matd

I understand thats home built lasercutter! Nice you care to share some plans for it?

Roger
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Old Nov 28, 2009, 05:38 PM
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Belgium
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finally got to finishing the nose on the cessna.
Hope you like it better (tell me what you think please).
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Old Nov 29, 2009, 10:56 PM
Sink stinks
Montag DP's Avatar
United States, GA, Atlanta
Joined Apr 2005
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Quote:
Originally Posted by Matd View Post
finally got to finishing the nose on the cessna.
Hope you like it better (tell me what you think please).
Looks pretty good to me. Time to start making parts for it.
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Old Dec 01, 2009, 05:58 AM
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Belgium
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Ok,

now I can start cutting the surfaces.
But first:
I was thinking of sheeting the fuselage with 2.5mm balsa, the wing with 1.5 and the stab and fin in 1mm.
But I'm doubting if this is enough (Wingspan: 1570mm (scale 1/7)).
What do you guys think?
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Old Dec 01, 2009, 08:45 AM
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East Anglia, UK
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Quote:
Originally Posted by Matd View Post
Ok,

now I can start cutting the surfaces.
But first:
I was thinking of sheeting the fuselage with 2.5mm balsa, the wing with 1.5 and the stab and fin in 1mm.
But I'm doubting if this is enough (Wingspan: 1570mm (scale 1/7)).
What do you guys think?
More than enough.
Although you will need ribs and spars under that for the wing.
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Old Dec 04, 2009, 03:34 PM
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Belgium
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I'm working on the wing now.

this is how I want to make it:
http://www.stefanv.com/rcstuff/lt25/wing4.jpg
Some sort of I beam construction (10x3mm spars on top and bottom and 3mm balsa in between).

Is this a good structure? Or will it be too heavy?
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Old Dec 06, 2009, 07:21 AM
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Belgium
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the wing so far:

-wing spars are 3x10mm
-the balsa in between is 3mm thick
-ribs are 2mm balsa
-LE is 2mm balsa
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Old Dec 06, 2009, 12:14 PM
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Belgium
Joined Oct 2006
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I'm wondering what's the best way to construct the flaps and ailerons.
This is how it is now (So 2 3mm balsa pieces next to each other, one is lit up yellow, other is still brown):

Can I make it work the way it is now?
I'd lake to make them as invisible as possible to maintain the scale looks,
so maybe a built in hinge mechanism.
But I find it hard to find good pictures showing how other people have done this.
So if anyone has some suggestions?
thanks
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