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Old Jul 17, 2012, 07:08 PM
Registered User
Hemet California
Joined Jul 2009
734 Posts
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My second mold making project.

I had to show this on my favorite composite site, I learned so much here so I can have all this fun! Thanks to all of you that helped as this stuff is addicting.

The model is a F5D pylon wing designed by PaulS and Biber that I am trying to stuff with state of the art power set up. Will start test flying in about 6 weeks. I will post some finished pics then.

DE
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Old Jul 17, 2012, 07:15 PM
Just fly it!
wyowindworks's Avatar
Cody, WY
Joined Nov 2007
6,915 Posts
Sweet!
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Old Jul 18, 2012, 11:37 AM
Composites guy
North OC, Ca.
Joined Jun 2005
1,177 Posts
Nice back-up structure.
Store those carefully so you don't get any washout/washin.

Looks like a nice, slow airplane............ yeah.

Look up aeroelastic tailoring and think about your ply angles as you have a swept wing.

I recall I was not smart enough to get the ply orientations under control but think about what you want the tips to do when you pull 30 g around the pylon( wash in or out).

Cool
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Old Jul 18, 2012, 03:07 PM
Caution:Makes sharp left turns
Troy's Avatar
United States, CA, Lake Forest
Joined Feb 1999
6,004 Posts
Scott, the wing you see is a mule, the finished will be all carbon. Go Dave!!
I have a Hangar queen hanging in my office...
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Old Jul 18, 2012, 04:19 PM
Composites guy
North OC, Ca.
Joined Jun 2005
1,177 Posts
So, I assume it is a bit quick?

I assumed the wing was going to have carbon skins. The question is what do you want the wing to do when you are bending it? keep the angle of attack the same as the un-belt wing, not bend or something else?
The X-29 used this concept of aeroelastic tailoring by making a non-symmetic lay-up that induced a non-orthogonal [B] matrix in the laminate analysis. In the real world this will make the part curl when it is bent which limited the angle of attack(alpha) at the tips under high g loadings.

Since you KNOW you will be bending the wing alot, what do you want it to do in that mode?

If you just want it to be stiff and reduce deflection, ( I am assuming you are only pulling high positive G's), then the upper skin compression stiffness is important.( may consider a intersection of the main spar and drag spar- also consider what type of fiber on the compression side of the main spar- I may have a part(which crashed) which could be "donated" for a trial if you are interested that has some autoclave cured Hybor in it.

To keep the swept wing from torsional oscillations the angle of the fabric will be important.
You may or may not see this depending on the wing stiffness and sweep.


Sorry for the off-topic tangent. You boys and your silly toy planes.....


Scott
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Old Jul 18, 2012, 04:31 PM
One Idiot is plenty...
Dbox's Avatar
Planet Earth
Joined Jun 2005
5,119 Posts
Dave,I know why did You start this thread for .
You need this thread as inspiration for You to finally finish damn wing
....use to do same things myself
Awesome looking "hangar queen" Troy.
Yuri,wingless.....
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Old Jul 18, 2012, 05:08 PM
2012 NZ Speedcup - 231 MPH
DownUnderPilot's Avatar
New Zealand, Tasman, Richmond
Joined Mar 2006
1,942 Posts
Very cool project. There would be a market for such a plane, I'm sure it would sell well. Not many commercially available pylon wings! Yuri?
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Old Jul 18, 2012, 05:23 PM
One Idiot is plenty...
Dbox's Avatar
Planet Earth
Joined Jun 2005
5,119 Posts
Quote:
Originally Posted by DownUnderPilot View Post
Not many commercially available pylon wings! Yuri?
I would not have problems to put this wing in to production.
....But it is initially not my "baby"
Yuri.
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Old Jul 18, 2012, 07:05 PM
Registered User
Hemet California
Joined Jul 2009
734 Posts
Yuri, I took almost a year off to build my wife a car that I promised her ten years ago. Now I can build all I want and not feel guilty. Now its mubu full speed ahead!

Scott, Thanks. I could lengthen the drag spar to the main spar. I think I want everything to stay pointed in the right direction. I have gotten a suggested lay up schedule from the designer and it includes fibre oreintation. The good part is if it blows up I can make another.

DE
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Old Jul 18, 2012, 09:36 PM
One Idiot is plenty...
Dbox's Avatar
Planet Earth
Joined Jun 2005
5,119 Posts
3 stage two tones WOW !!!!
Your wife has to have matching manicure from now on
You hired Dave
Yuri.
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Old Nov 29, 2012, 05:47 AM
Aka: Tom Jenkins
ApexAero's Avatar
Palm Beach County, Fl.
Joined Aug 2008
4,400 Posts
Dave,
Your work is some of the finest I've seen, question on the ability for the prop to fold when mounted tractor rather than pusher. Will it work or interfere and get jambed on the LE?
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Old Nov 29, 2012, 02:16 PM
Registered User
Hemet California
Joined Jul 2009
734 Posts
Thanks Apex,
I tried a simple small wire that helped the prop out a little and then the sweep of the wing let it smoothly slide open.

This project has been tabeled for a while as PaulS who was part of the design team for the wing and sawtooth prop and I are working on a new F5D model, It is very different than anything out as of yet, fingers crossed.

DE
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Old Dec 02, 2012, 07:37 PM
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Schoolya's Avatar
United States, FL, Mayo
Joined Jul 2012
144 Posts
Is that all the info we get. I am working on a foam cored mubu now. Should i stop?
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Old Dec 03, 2012, 10:43 AM
Caution:Makes sharp left turns
Troy's Avatar
United States, CA, Lake Forest
Joined Feb 1999
6,004 Posts
I would keep building. I have my Mubu test airframe about 3/4 done but have been working on some other things for Dave and the project. I also had another project to finish ahead of the Mubu. I actually scratch built a Mubu way-back-when using foam cores and balsa skins and it flew well with modest power. I had a radio failure in flight which destroyed the model.

http://static.rcgroups.net/forums/at...Bumm%20027.jpg
http://static.rcgroups.net/forums/at...Bumm%20030.jpg
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Old Jan 01, 2013, 02:56 PM
Entropy is happening!
Jim.Thompson's Avatar
Bellingen NSW Australia
Joined Aug 2008
6,553 Posts
Nice piece of work in this plane.
Any progress reports?
I think it is a good inspiration for a sloper.

Jim.
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Latest blog entry: Yet another light plank!
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