Re: Thrust Line & Bellyboard
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Marinus B. \(Ben\) Bosma <ben@...>
I'm not a composite engineer but I employ one.
.007 is a good number for thickness per ply but I can tell you that 12 layers of vacuum bagged carbon fiber is more structurally than you need. I would suggest that if you want some thickness you put a foam core in between 2 layers per side. Use an epoxy resin vs. a polyester and drill 1/16" holes in the foam on 1inch centers to create pilings between skins. Vacuum infuse. I'll run the analysis in the morning on a 24" X 12" against a 200knot sea-level breeze and see how close I am. A board that size is probably equal to the total drag of the rest of the airplane if not more. The format for that is w/w/fc.5/w/w where w=weave, fc=foam core If you can find a small patch of honeycomb all the better but that means laying up two plies and bonding them over a honeycomb to keep resin out of the cells. My personal favorite is end cut balsa for core material. -Ben N124BB (reverse engineering a Q1) _____ From: Joseph Snow [mailto:1flashq@...] Sent: Wednesday, March 02, 2005 10:09 PM To: Q-LIST@... Subject: Re: [Q-LIST] Thrust Line & Bellyboard Yes, that would give it a better contour. If a composite engineer could offer a carbon fiber layup schedule, that would be great. Otherwise, some of us newbies will not be able to duplicate the 6-pack. Aircraft Spruce says the carbon fiber bid is .007 thick. I am calculating that I would need about 12-13 layers. I can get 12 pieces from 1 sq. yd. of bid. I may have to "wing" it. Thanks for your help. Joseph ----- Original Message ----- From: Sam Hoskins To: Q-LIST@... Sent: Wednesday, March 02, 2005 9:04 PM Subject: RE: [Q-LIST] Thrust Line & Bellyboard I would do the layup on the unblemished belly. After that's done, then dig out the foam per plans. I have now idea about the orientation. Maybe one of our composite engineers could chime in. Sam http://samhoskins.blogspot.com/ _____ From: Joseph Snow [mailto:1flashq@...] Sent: Wednesday, March 02, 2005 7:20 PM To: Q-LIST@... Subject: Re: [Q-LIST] Thrust Line & Bellyboard Ok, that makes sense. I could cut out the 10" x 11" skin, remove 1/8" foam, then vacuum bag the layup. Any idea on orientation of the carbon fiber cloth, i.e., front to back, side to side, 45 deg. ? I have never used carbon fiber cloth. Should it be Uni or Bid? Joseph Quickie Builders Association WEB site http://www.quickiebuilders.org Yahoo! Groups Sponsor ADVERTISEMENT <http://us.ard.yahoo.com/SIG=129lkt5td/M=298184.6018725.7038619.3001176/D=gr oups/S=1705065618:HM/EXP=1109899209/A=2593423/R=0/SIG=11el9gslf/*http:/www.n etflix.com/Default?mqso=60190075> click here <http://us.adserver.yahoo.com/l?M=298184.6018725.7038619.3001176/D=groups/S= :HM/A=2593423/rand=326108325> _____ Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Q-LIST/ * To unsubscribe from this group, send an email to: Q-LIST-unsubscribe@... <mailto:Q-LIST-unsubscribe@...?subject=Unsubscribe> * Your use of Yahoo! Groups is subject to the Yahoo! <http://docs.yahoo.com/info/terms/> Terms of Service. Quickie Builders Association WEB site http://www.quickiebuilders.org Yahoo! Groups Sponsor ADVERTISEMENT ---------------------------------------------------------------------------- -- Yahoo! Groups Links a.. To visit your group on the web, go to: http://groups.yahoo.com/group/Q-LIST/ b.. To unsubscribe from this group, send an email to: Q-LIST-unsubscribe@... c.. Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service. Quickie Builders Association WEB site http://www.quickiebuilders.org Yahoo! Groups Sponsor ADVERTISEMENT <http://us.ard.yahoo.com/SIG=1294bvo96/M=298184.6018725.7038619.3001176/D=gr oups/S=1705065618:HM/EXP=1109905759/A=2593423/R=0/SIG=11el9gslf/*http://www. netflix.com/Default?mqso=60190075> click here <http://us.adserver.yahoo.com/l?M=298184.6018725.7038619.3001176/D=groups/S= :HM/A=2593423/rand=306412777> _____ Yahoo! Groups Links * To visit your group on the web, go to: http://groups.yahoo.com/group/Q-LIST/ * To unsubscribe from this group, send an email to: Q-LIST-unsubscribe@... <mailto:Q-LIST-unsubscribe@...?subject=Unsubscribe> * Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service <http://docs.yahoo.com/info/terms/> . |
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