Logo
Builders' Plan Gallery  |  Hip Pocket Web Site  |  Contact Forum Admin  |  Contact Global Moderator
October 16, 2018, 12:28:43 AM *
Welcome, Guest. Please login or register.

Login with email, password and session length
 
Home Help Search Login Register
Pages: 1 2 [3]   Go Down
Print
Author Topic: Composite Wing Builders Lounge.  (Read 4686 times)
0 Members and 1 Guest are viewing this topic.
edwinzea
Bronze Member
***

Kudos: 2
Offline Offline

Switzerland Switzerland

Posts: 23



Ignore
« Reply #50 on: April 07, 2014, 04:32:25 PM »

Dear Jim

nice that you started this thread. I had been fiddling with this idea for some time, but I was busy building the DLG planes for this season Tongue

West systems (slow) works really great for me, I was using carboline on my last built and it was a blast, check it on hyperflight of vladimir models. THis fabric is the future. But having build some DLGs on the past few years I think a glass over XPS should be enough.

And yes to T blades, it helps you transferring the force into the plane much better, and the arm is in a more confortable position during and after launch

EZ 8-D

Logged
dylan1024
Bronze Member
***

Kudos: 2
Offline Offline

South Africa South Africa

Posts: 34



Ignore
« Reply #51 on: May 13, 2014, 01:45:19 AM »

Hi Jim

I am looking at machining molds for composite wings, I used the coordinates for StanfoilBEmod2 but get some slightly odd results:

the flat on the leading edge is slightly concave and towards the TE the foil reflexes slightly then pulls in to the final TE thickness.

do you have any other info on this foil? LE radius? should it be a razor sharp LE?

Kind regards

Dylan Roberts
Logged
Richard Ewing
Bronze Member
***

Kudos: 2
Offline Offline

Italy Italy

Posts: 85



Ignore
« Reply #52 on: May 13, 2014, 07:51:13 AM »

Dylan,
You might check to see if the CAD software you are using has an option for smoothing that can be turned on or off.  I know I got some interesting results with one of the BE airfoils that had the flat facet near the leading edge when I had the smoothing function on.  Switching it off made the shape look much better, (the upper surface behind the LE radius changed from concave, to flat). 
Rick
Logged
dephela
Silver Member
****

Kudos: 2
Offline Offline

United States United States

Posts: 122




Ignore
« Reply #53 on: May 13, 2014, 08:10:36 AM »

I've used blades but gave them up for what I thought was a better launch just gripping the wing. Can someone post a pic of the T blades being used now?

Dennis
Logged

Dennis
sweepettelee
Platinum Member
******

Kudos: 19
Offline Offline

United States United States

Posts: 1,311


Simplicate & add more lightness. Keep sanding!



Ignore
« Reply #54 on: May 13, 2014, 10:20:05 AM »

Dennis,
Go to post 25 from Dec 13. Click link to T- Grip.
Logged

Leeper
dephela
Silver Member
****

Kudos: 2
Offline Offline

United States United States

Posts: 122




Ignore
« Reply #55 on: May 13, 2014, 02:01:09 PM »

Thanks Lee. I have two f/f dlg's without blades and one with. I think I still like without the blade. Next time I go out it will be with a glove and I will have tried all the ways!
Logged

Dennis
jim_buxton
Silver Member
****

Kudos: 3
Offline Offline

United States United States

Posts: 153


Topic starter
Fly more gliders!



Ignore
« Reply #56 on: June 02, 2014, 04:35:33 PM »

Dylan, sorry I kinda drifted off of this thread for awhile.  Did the advice you were given solve the problem?  The wing should look as the image shown.
Regarding throwing blades/pegs/gloves style...it is 100% user preference.  There is no right or wrong.  If you like it, it is right. 

I prefer no peg on smaller lighter models.  I can accelerate these with my wrist at the moment of launch with a flick of the wrist and get better launch height than I do with a peg.  The models I fly this way are my indoor models.  40-50 grams, 33 inch span or so. 

I absolutely need a peg on my 39" composite models that weigh around 120 grams.  I tried one without, then added a peg and tried again.  I picked up 20 seconds in dead air with the peg. 

Look at the 1.5 meter 9 ounce DLG's, every last one has a peg, and guys are throwing them 300'.

The standard outdoor sized FF glider at 36" and 80-90 grams is right in the transitional area where it might be better for some to use a peg, and better for others not to.  I strongly recommend you try it both ways and do some testing to determine what works best for you if you are in that range.
~Jim 
Attached files Thumbnail(s):
Re: Composite Wing Builders Lounge.
Logged

~Jim Buxton
Columbus Ohio
dylan1024
Bronze Member
***

Kudos: 2
Offline Offline

South Africa South Africa

Posts: 34



Ignore
« Reply #57 on: June 09, 2014, 08:18:35 AM »

Hi Jim

yea, we came right with the foil. we re-drew it from bits of info and your co-ordinates. set of wing molds to follow soon
Logged
dylan1024
Bronze Member
***

Kudos: 2
Offline Offline

South Africa South Africa

Posts: 34



Ignore
« Reply #58 on: September 16, 2014, 03:07:34 PM »

510mm span for each half. StanBEmod2 foil... or as close as we could get. Bottom surface mold is on the machine
Attached files Thumbnail(s):
Re: Composite Wing Builders Lounge.
Re: Composite Wing Builders Lounge.
Logged
dylan1024
Bronze Member
***

Kudos: 2
Offline Offline

South Africa South Africa

Posts: 34



Ignore
« Reply #59 on: September 21, 2014, 11:18:26 AM »

Rohacell 31 cores and Vlad 29g carbon. 57.8g
Attached files Thumbnail(s):
Re: Composite Wing Builders Lounge.
Re: Composite Wing Builders Lounge.
Logged
dylan1024
Bronze Member
***

Kudos: 2
Offline Offline

South Africa South Africa

Posts: 34



Ignore
« Reply #60 on: September 25, 2014, 05:25:42 AM »

Blake just popped second wing out the molds. This one is much lighter.
Attached files Thumbnail(s):
Re: Composite Wing Builders Lounge.
Logged
jim_buxton
Silver Member
****

Kudos: 3
Offline Offline

United States United States

Posts: 153


Topic starter
Fly more gliders!



Ignore
« Reply #61 on: May 04, 2015, 03:48:02 PM »

These are GORGEOUS!!!!  Since you have molds you must make more to recover some of the cost, correct?!?!
~Jim
Logged

~Jim Buxton
Columbus Ohio
F3KBlake
Bronze Member
***

Kudos: 2
Offline Offline

South Africa South Africa

Posts: 16




Ignore
« Reply #62 on: May 31, 2015, 02:49:30 AM »

Ok so who is going to design us a new airfoil for bagged and moulded wings? Or is StanBE Mod2 good enough?
Logged
Rewinged
Gold Member
*****

Kudos: 19
Offline Offline

United States United States

Posts: 652



Ignore
« Reply #63 on: May 31, 2015, 03:46:49 AM »

I think the answer might be somewhere between StanBE Mod2 and recent LD F1A airfoils.  Compare the RE of F1A and your glider; maybe that will be informative.  Also look at the airfoil Ken Bauer has been using for FF CLG and HLG.  Sort of in between.

Just guessing.  Tmat said that their studies couldn't find anything notably better than StanBE Mod2.

--Bill
Logged

Good air don't care!
dylan1024
Bronze Member
***

Kudos: 2
Offline Offline

South Africa South Africa

Posts: 34



Ignore
« Reply #64 on: May 31, 2015, 06:33:38 AM »

Would a flapped foil be worth looking at? Something similar to indoor where they rely on it flattening out for high speed launch and the camber pulling back in as it transitions to glide?
Logged
dephela
Silver Member
****

Kudos: 2
Offline Offline

United States United States

Posts: 122




Ignore
« Reply #65 on: May 31, 2015, 06:58:29 AM »

I've used Mark Drela's AG04 on my balsa winged planes and they seem to perform well. I have some cores cut, still mumbling to myself about bagging them.
Logged

Dennis
Tmat
Titanium Member
*******

Kudos: 67
Offline Offline

Canada Canada

Posts: 2,897




Ignore
« Reply #66 on: May 31, 2015, 10:27:59 PM »

Lovely work. How do you handle the leading edge. What's the materials and process?

Tmat
Logged

F1B guy...
But don't hold that against me!
F3KBlake
Bronze Member
***

Kudos: 2
Offline Offline

South Africa South Africa

Posts: 16




Ignore
« Reply #67 on: June 01, 2015, 06:27:19 AM »

When moulding the TernFree wing we just simply use a small bead of splooge top and bottom LE to join the skins together. The trick is the type of splooge. We use a product from Axxon called 9940. Its extremely tough semi rigid epoxy. Any splooge will do, except i found most epoxys cure hard and brittle rendering the LE hard and brittle. 9940 can take a lot more abuse before it splits. Chances are that if there is one fence post on the field your model will find it. Its nice to walk away from those moments and carry on flying.

Blake
Logged
-John-
Silver Member
****

Kudos: 2
Offline Offline

United States United States

Posts: 173



Ignore
« Reply #68 on: June 02, 2015, 12:49:58 PM »

Ok so who is going to design us a new airfoil for bagged and moulded wings? Or is StanBE Mod2 good enough?
One could always acquire the Profili software and do some runs(or mods) of selected airfoils to find out what might work well.
...I think the quest for the ultimate airfoil(s) has occurred since the beginning of flight.
Logged
Pages: 1 2 [3]   Go Up
Print
Jump to:  

Powered by MySQL Powered by PHP Powered by SMF 1.1.21 | SMF © 2015, Simple Machines Valid XHTML 1.0! Valid CSS!