Carbon Fibre D-box LE - RC Groups
Thread Tools
Oct 16, 2017, 12:15 AM
Registered User
Discussion

Carbon Fibre D-box LE


I'd like to make some larger gliders in the near-ish future and I'm looking at carbon fibre D-box leading edges. I have vacuum equipment etc, but the mould is a puzzler - it would be 2m long. I enquired about 2m machined moulds and frankly one of my cars would cost less (which says more about my car). So with a little searching I found the following:
http://www.cstsales.com/d-box.html
Do you think it would be reasonable to follow that process, but instead CNC a 2m piece of hardwood into the required profile: AG35 - AG38? - of course a left and right would be needed.
Sign up now
to remove ads between posts
Oct 16, 2017, 06:09 AM
I hate propellors
emufingers's Avatar
Quote:
Originally Posted by RaceMag
I'd like to make some larger gliders in the near-ish future and I'm looking at carbon fibre D-box leading edges. I have vacuum equipment etc, but the mould is a puzzler - it would be 2m long. I enquired about 2m machined moulds and frankly one of my cars would cost less (which says more about my car). So with a little searching I found the following:
http://www.cstsales.com/d-box.html
Do you think it would be reasonable to follow that process, but instead CNC a 2m piece of hardwood into the required profile: AG35 - AG38? - of course a left and right would be needed.
I have tried but failed to find a description of building a d box around a male form using peel ply over the male form ( wood as you suggest) Then thn cloth layers and stretchy plastic "strechlon" as the vacuum bag to give a good finish. The results were good. I'll keep looking.

Also you can buy preformed d box to order from http://www.clm-pro.com/accessories/carbon-kevlar-d-box you can order via Australian agent
http://glidergear.com.au/
Oct 16, 2017, 07:10 AM
Registered User
Thanks for your reply. I saw the CLM stuff but if you're building two 4m gliders, well that's quite a sum.
Oct 16, 2017, 09:52 AM
Registered User

Carbon Fibre D-box LE


Interestingly the CLM profiles look more like a formed V - flat with a rounded edge LE, not really a wing profile. Since the CF is quite thin, hence flexible, it is when fitted over a set of ribs that it then takes on the proper shape.
Oct 16, 2017, 01:01 PM
Registered User
Could It be possible to hotwire negatives, to mold the D-box into? Use the densest foam available, thin plastic between mould and cf, then vacuum.
Hotwiring could be done in 1m sections.

Lars
Oct 17, 2017, 02:45 AM
I hate propellors
emufingers's Avatar
found one version in free flight

http://www.gregorie.org/freeflight/cf_wing/cf_wing.html
Oct 17, 2017, 04:01 AM
Registered User
That's pretty much what I want to do.
Oct 17, 2017, 06:10 AM
Entropy is happening!
Jim.Thompson's Avatar
What is the intended planform?
Straight tapered panels? Or elliptical tips? Combination of both?
Not enough details supplied to provide you with much of an answer really.
Oct 17, 2017, 07:31 AM
Registered User
straight tapered panels at this point. Ava Pro (advanced bubble dancer really) style glider for first real ALES/F5j flying that does not break the bank. Flaps, Ailerons, polyhedral.
Oct 18, 2017, 08:46 AM
Rock Breaker
gazasmith's Avatar
Carbon sock I find easy to make LE Dbox with. I hot wire cores and hand shape tips using XPS foam. Then cut the LE of, make sure you remember the top, thread the foam into the sock carbon sock then work the sock tight. You can double layer the sock for more strength.

https://www.rcgroups.com/forums/show...5-Rock-Breaker
https://www.rcgroups.com/forums/show...r-Light/page13
These are made in moulds very robust planes.

Gaza


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Question carbon kevlar LE D-box repair balsabozo Thermal 9 Sep 18, 2007 10:50 PM
Discussion Trinity F3F Carbon or Carbon D-Box?? P-51flyer Slope 10 Jul 23, 2006 03:51 AM
Discussion Trinity carbon D-box or full carbon? ave Slope 47 Mar 14, 2006 02:40 AM
Carbon Fibre LE on Lite-Stick? Petermcc Parkflyers 2 Sep 22, 2001 05:58 AM