Wednesday, March 18, 2009

First carbon fiber tube wrap

Last night I finally mustered the energy to lay up my first carbon fiber tube. In this case I reinforced a partially built booster for a 54mm minimum diameter craft. I roughed up the phenolic tube to better take the resin, followed Dave Triano's layup schedule to the letter, and ended up with the following structure:

In this oblique shot you can just see the heat shrink tape spiral:

Finally I placed this structure in my curing oven and let it sit for 90 mins:

Here's a close-up of the cured result:

Most of the structure is smooth but I picked a varied area for the blog. The Mylar film I used to smooth out the cured surface was not treated with a release layer. As a result some spots of higher surface energy didn't want to release the film so I've got some point defects to deal with (white flecks). Also, despite saturating the structure with resin, there are still some voids down to the fabric. I'm thinking I'll fill, prime, and paint the booster fully and hopefully the payload section will turn out better.  I can then leave the beautiful carbon fabric appearance on this upper section.  Overall I'm very pleased with this first effort.

I'll reiterate here that Dave Triano is my hero 'cause he chooses to share his wealth of composite material knowledge with the high-power rocketry community. Thanks, Dave!  Please consider buying his videos.

No comments: