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Old Mar 17, 2012, 04:46 PM
Where is the inspiration
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Moira
Joined Feb 2006
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Groove Armada DP

After starting a thread a couple of years ago
http://www.rcgroups.com/forums/showthread.php?t=1299094
The itch has continued.
I now have some sort of a design, but still with no section confirmed for wing, stab or fin.
I have worked on my likes of the dynamics and kinetics, and added a bit of my own.
The initial design is for a 2m, with the idea to have a 2.5 on the same fuz.

Fuz is kept small but not too small.

moment of the 2m is quite long about the same as a dynamic would be, but with the 2.5m wing its more inline with the kinetic,

Still not sure if it will be T or X tail. i like the way I have it now, but its an extra mould.

Please feel free to rip it to shreds, and all ideas on wing sections will be greatly appreciated.

Will
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Old Mar 18, 2012, 03:42 PM
ETS....Energy retention system
timbuck's Avatar
gold coast australia
Joined Aug 2008
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Looks nice will....subscribed..

So what's the deal..CNC. Mdf...corian..LG himacs...???

Tim
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Old Mar 19, 2012, 02:26 AM
Where is the inspiration
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Moira
Joined Feb 2006
815 Posts
Quote:
Originally Posted by timbuck View Post
Looks nice will....subscribed..

So what's the deal..CNC. Mdf...corian..LG himacs...???

Tim
Hello Tim

Depending on confidence and finance, I would love to make them out of a corian type of material, and cnc cut cavities. I had an offer a while back for some cheep cnc work, but the materials would still cost 1k for the lot. I am also considering using china to mill the cavities.

At the moment its all about wing stab and fin sections

After some feed back I will reduce the size of the fin by 10%.

The stab also needs a new plan form to bring it in line with the wing.

And it all needs a bit more finesse.

I also have access to 3d fluid dynamics with a bunch of university students, but unfortunately none of us know what we are looking for so still hoping to find some guidance with that.

William
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Old Mar 19, 2012, 07:53 AM
Deniable plausibility
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Derbyshire, UK
Joined Aug 2008
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Interesting Y'know, there are some very accurate patern making methods that don't require CNC milling if cost is an issue. Only downside is you'll not be able to have a curved LE.
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Old Mar 29, 2012, 01:21 AM
Where is the inspiration
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Moira
Joined Feb 2006
815 Posts
a Bit of an update

Been getting back in to this abit and attached is some ideas from a fuz perspective.
Trying to get the ratios between wing, stab and fin correct.

I quite like the sub fin Idea.

The canopy opening will be smaller then in the picture, with an insert to cover over that is screwed / glued in place. It will have the smallest hole required for your switch / plugs to power your model. and the canopy will cover the lot Flush. Only challenge here is to find a way to fix the insert to the fuz. My preference is lots of little screws.

Will
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Old Apr 26, 2012, 03:05 AM
Where is the inspiration
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Moira
Joined Feb 2006
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Spent some times putting a proper section on this model, and trying to smooth the fuz out.
SD8020 on the Fin
Choice fo sd8020 or RK40 on the stab
and at the moment RK40 on the wing
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Old Apr 26, 2012, 04:22 AM
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Leicestershire
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Why would you consider a cambered section for the stab, Will? I would imagine you are better off with a symmetrical unit, or your elevator trim will change dramatically with speed.

Z
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Old Apr 26, 2012, 04:51 AM
ETS....Energy retention system
timbuck's Avatar
gold coast australia
Joined Aug 2008
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Yes ?.
Symmetrical.
HT14 is a very popular tail foil.
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Old Apr 26, 2012, 01:26 PM
Where is the inspiration
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Moira
Joined Feb 2006
815 Posts
I still have a lot to learn about wing sections don't I.
The main reason for the rk40 on the stab was because I had it to hand after putting it on the main wing.
last night I put the SD8020 on because I thought that was more realistic.
I have down loaded the HT14 and will have a look at it.

I am still hoping to use a DP section on the wing..
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Old Apr 26, 2012, 02:11 PM
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It's not necessarily a no no. There were some pylon racers which used a very slightly inversely cambered section on the stab - arguably a lower drag method of achieving decalage. But pylon racers have a pretty good idea of the speed range they will be operating in at full bore, due to knowledge of the class/ motor performance etc. DS we don't really have an optimal speed range in mind - we just want maximum! So to have a cambered section on the stab isn't necessarily a no-no, just that it focusses the design to be optimal within a speed range.

Z
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Old May 01, 2012, 03:47 PM
Where is the inspiration
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Moira
Joined Feb 2006
815 Posts
bit of an update

I have a model that although it doesn't have the final section, the shapes are correct.

So I have been putting them into a CFD package to "Blow some air" over the model. But what a mission that is. There is a lot of learning going on. Loads of time on you tube watching videos. Just hope I can get there in the end, as its taking valuable design/ build / fix time.

Will
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Old May 01, 2012, 04:49 PM
ETS....Energy retention system
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gold coast australia
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Sounds great will.
Evolution is a wonderful thing.
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Old May 01, 2012, 04:55 PM
Where is the inspiration
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Moira
Joined Feb 2006
815 Posts
What I managed to do.

What does it mean, that's where the learning comes in.

Will.
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Old May 03, 2012, 02:29 PM
Where is the inspiration
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Moira
Joined Feb 2006
815 Posts
Last night was one of those downer days. Just loads going wrong.
The high-lights
1)After days trying to fix my D80 wing, and thinking it was nearly done, I managed to rip what was obviously only hanging on by a thread, aileron near off (From tip to horn) I had tried to repaired the wiper but the resin was old and didn't cure, so I was trying to remove it with a dreml type brass brush, and that was enough.

2) After spending hours trying to analyse another model, I saved and restarted my machine, only to the the file not work when I re loaded.

3) After starting work on a new design, again another couple of hours, "OK to Terminate" and that is all you can do, press OK and watch your work slip away.

Hopefully today will be better. But allot of catching up to do.
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Old May 03, 2012, 04:38 PM
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I.T! bang head!
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