Help Support RocketryForum by donating using the link above or becoming a Supporting Member.


Results 1 to 4 of 4
  1. #1
    Join Date
    4th July 2015
    Location
    London, UK
    Posts
    370

    good results with Easy Composites XCR CF skinning.

    I know we don't really do build threads here on the UK section of TRF , so this isn't one.. nevertheless, I've been working with Stafford based company Easy Composites' improved XCR CF skinning kit, and Im very pleased with the results, so I thought Id post up some pictures by way of recommendation. For this build Ive been wrapping 3 PML phenolic tubing with one layer of 2/2 3K twill. The materials are relatively easy to work with, particularly given that the resins are very low odour. I bought the larger 1.5 x 1m roll of the 2/2 3K twill, and bought the 1kg can of top coat, although the 500g base coat bottle was needed. Suffice to say I didnt use up the entire amount of either. Skinning is the simplest form of lay up, involving allowing the initial base coat to go to tack, then applying the cloth, then successive layers of top coat, which have to added at specific (and varied) points during the curing process, so you need to make sure you set aside sufficient time. It also involves progressive flatting, which is pretty laborious. The first few flatting sessions 120 400 grit are dry sanding (professional masks and goggles essential) and then after that, and the final layer of top coat, its wet sanding from 400 1200. However, the results are very pleasing. The instructions are very detailed and easy to follow, and theres also videos on the company website. They also run a very helpful technical advice line staffed by a very helpful actual real person. With careful measuring beforehand the seam can be kept straight and flat, and there were very few pin holes.


    The only point of departure I made from the instructions was the very last stage, where I didnt use the NW1 polishing compound (not sure why youd name a polishing compound after Camden Towns postcode but there you go..). Once Id finished wet sanding with 1200 grit I masked off and sprayed the roll pattern (a can of Fiat Red-Orange from Halfords), lightly sanded that once it was dry, then glossed it all with two coats of clear lacquer.

    The fins are 3mm ply sandwiched with the same CF, set in fin pocket dams. The thrust plate was made from 3 rings of laser cut ply, clamped and glued, then drilled for metric threaded inserts to hold the flanged retainer.

    I hope to scratch, scuff or otherwise ruin all this fancy finish at this year's Big Ears...

    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	cf wrap without resin.jpg 
Views:	69 
Size:	120.4 KB 
ID:	312969   Click image for larger version. 

Name:	cf with first coat.jpg 
Views:	67 
Size:	114.6 KB 
ID:	312970   Click image for larger version. 

Name:	thrusplate1.jpg 
Views:	69 
Size:	94.0 KB 
ID:	312971   Click image for larger version. 

Name:	thrustplate2.jpg 
Views:	59 
Size:	87.1 KB 
ID:	312972   Click image for larger version. 

Name:	thrustplate3.jpg 
Views:	64 
Size:	77.5 KB 
ID:	312973  

    Click image for larger version. 

Name:	booster section wet sanding.jpg 
Views:	68 
Size:	103.0 KB 
ID:	312974   Click image for larger version. 

Name:	seam.jpg 
Views:	73 
Size:	71.2 KB 
ID:	312975   Click image for larger version. 

Name:	complete.jpg 
Views:	86 
Size:	87.9 KB 
ID:	312976   Click image for larger version. 

Name:	complete retainer fitted.jpg 
Views:	78 
Size:	95.9 KB 
ID:	312977  
    UKRA #1895
    EARS #1329
    L1 6/9/15 Custom built LOC Fantom 438 CTI H125
    L2 3/4/16 Same custom built LOC Fantom w/ DD EXL configuration CTI J410

  2. #2
    Join Date
    4th July 2015
    Location
    London, UK
    Posts
    370
    As I'd hoped, I flew this rocket for the first time Saturday 29th at Big EARS on a CTI J270 to 3282 ft:


    As I started out that morning the Stones' 'Start Me Up' was on the radio, so I decided to name the rocket accordingly.
    A successful flight in general, though the booster sustained slight easily fixable damage which I think was probably a strike by the FWFG nosecone during descent. I'll fit a plastic NC for future flights on this size of motor, and keep the FG one for K motor flights. I thought I'd switched on the on board mobius at the pad...'thought' being the operative word here, so my son's iPod footage is the only record of the flight.

    I'm curious about the wobble visible shortly after leaving the rail. It straightens out as the rocket gathers pace.

    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	At rest after first flight.jpg 
Views:	55 
Size:	249.8 KB 
ID:	319005  
    UKRA #1895
    EARS #1329
    L1 6/9/15 Custom built LOC Fantom 438 CTI H125
    L2 3/4/16 Same custom built LOC Fantom w/ DD EXL configuration CTI J410

  3. #3
    Join Date
    20th February 2009
    Location
    Cayuga, Indiana
    Posts
    12,641

    good results with Easy Composites XCR CF skinning.

    Really great looking! Love the checkerboard fins!
    L3, TRA #11847
    Tripoli Indiana #132
    Tripoli Central Illinois #59
    Central Illinois Aerospace (NAR) #527
    Chicago Rocket Mafia, "Big Bucks" Dixon
    ___________________________________

    Quiet little voices creep into my head. -- We Were Promised Jetpacks

  4. #4
    Join Date
    4th July 2015
    Location
    London, UK
    Posts
    370
    Quote Originally Posted by dixontj93060 View Post
    Really great looking! Love the checkerboard fins!
    Thanks! Yes, as I said a while back on Eric Cayemberg's monster Loc thread, I don't think you can go far wrong with a black and red roll pattern..
    UKRA #1895
    EARS #1329
    L1 6/9/15 Custom built LOC Fantom 438 CTI H125
    L2 3/4/16 Same custom built LOC Fantom w/ DD EXL configuration CTI J410

Similar Threads

  1. US Composites
    By littlemisterbig in forum Techniques
    Replies: 18
    Last Post: 22nd March 2015, 08:26 PM
  2. Some good prices at CST Composites...
    By dixontj93060 in forum The Watering Hole
    Replies: 1
    Last Post: 10th April 2013, 07:52 PM
  3. US Composites
    By ben in forum Vendor Display
    Replies: 0
    Last Post: 8th May 2007, 09:10 PM
  4. Composites
    By Elapid in forum Scratch Built
    Replies: 23
    Last Post: 20th October 2004, 06:06 PM
  5. Good, Bad and Ugly paint results
    By DynaSoar in forum Techniques
    Replies: 2
    Last Post: 1st June 2004, 11:27 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •