Ye Olde Rocket Forum

Go Back   Ye Olde Rocket Forum > Work Bench > Scale & Sport Scale Rocketry
User Name
Password
Auctions Register FAQ Members List Calendar Today's Posts Search Mark Forums Read


Reply
 
Thread Tools Search this Thread Display Modes
  #131  
Old 08-07-2018, 09:28 AM
neil_w's Avatar
neil_w neil_w is online now
Mr. Cut-by-hand
 
Join Date: Nov 2015
Location: Northern New Jersey
Posts: 336
Default

Well, I first made an attempt to just sand the area (lightly!!!) and then paint. Didn't look as good as I wanted, so, after much internal dialog, I tried to do a little with the Tamiya white. That did not go well at all; as soon as I started I could see it was not going well. As feared, the repair area grew, and I'm not sure if I even improved any of the parts I was trying to fix.

At this point I will just repaint and call it done, whatever it looks like. I will have to practice this technique off-line so I'll be ready when needed in the future.
Reply With Quote
  #132  
Old 08-12-2018, 09:32 PM
neil_w's Avatar
neil_w neil_w is online now
Mr. Cut-by-hand
 
Join Date: Nov 2015
Location: Northern New Jersey
Posts: 336
Default Ugh

Well, I had a little... incident. It was hard enough to write up once, and I'm not up for doing it twice, so for those interested I'll just point you to the relevant posting on TRF: https://www.rocketryforum.com/threa...-6#post-1806473.

Enjoy (?).
Reply With Quote
  #133  
Old 08-19-2018, 08:57 PM
neil_w's Avatar
neil_w neil_w is online now
Mr. Cut-by-hand
 
Join Date: Nov 2015
Location: Northern New Jersey
Posts: 336
Default

I continue to lurch towards the end of this build.

Today I installed a new laundry shelf, and was able to get it in about 7.5" from the tip of the BT, which I think should just be enough. I then applied a patch on the inside of the body tube where I punctured it. See picture 1.

Then, in order to get the flap of BT to lay flat(-ish), I carefully trimmed the "inner" layers of it, corresponding to the inner layers of the rolled BT. Then I put a dab of TBII into the hole, and pressed down the flap. Because the hole was only about 3" from the end of the BT, I was able to squeeze it between my fingers (index finger inside the tube, thumb on the outside). Once the glue had set up, the flap was pretty flat. It's not beautiful but honestly it's less bad than I thought it would be. See picture 2.

Tomorrow I will apply a wee bit of touch-up paint onto the damaged area, and another coat around the base of my repaired fin (which does not look as good as I would like, to say the least). Then we're almost there.
Attached Thumbnails
Click image for larger version

Name:  Shelf-and-fix-1.jpg
Views: 21
Size:  180.8 KB  Click image for larger version

Name:  Shelf-and-fix-2.jpg
Views: 24
Size:  336.4 KB  
Reply With Quote
  #134  
Old 08-30-2018, 10:57 AM
neil_w's Avatar
neil_w neil_w is online now
Mr. Cut-by-hand
 
Join Date: Nov 2015
Location: Northern New Jersey
Posts: 336
Default Finished fixes

The paint fixes to my fin (with replacement decal) and the BT hole are now complete. A more skilled and/or dedicated craftsman could no doubt have done better, but I'll take it. I can at least say they look better than before.

Down to the last couple of tasks.
Attached Thumbnails
Click image for larger version

Name:  Fixes-final-3.jpg
Views: 21
Size:  151.4 KB  Click image for larger version

Name:  Fixes-final-1.jpg
Views: 21
Size:  54.8 KB  Click image for larger version

Name:  Fixes-final-2.jpg
Views: 18
Size:  87.3 KB  
Reply With Quote
  #135  
Old 08-30-2018, 12:23 PM
ghrocketman's Avatar
ghrocketman ghrocketman is offline
President, MAYHEM AGITATORS, Inc.
 
Join Date: Jul 2005
Location: Michigan
Posts: 8,800
Default

Just call it battle fatigue/weathering.
Now you just need to find an actual IRIS, and mangle the side of it with a small wart matching your model.
__________________
When in doubt, WHACK the GAS and NEVER touch the brake !!!
No Harm=NO Foul advocate

If you are NOT FLYING LOW in the left lane, you need to GET THE #$&@ OUT of it !

Yes, there is such a thing as NORMAL
, if you have to ask, you probably aren't
!
Reply With Quote
  #136  
Old 09-03-2018, 07:34 PM
neil_w's Avatar
neil_w neil_w is online now
Mr. Cut-by-hand
 
Join Date: Nov 2015
Location: Northern New Jersey
Posts: 336
Default Nose weight and eyelet

Finished up the nose cone today.

Previously I had hand-drilled a good sized and very rough hole in the shoulder. After wrapping the nose cone to protect it, I laid it gently in a vice. [picture 1]

After some fiddling I settled on about 2/3 oz nose weight to get the CG where I wanted it. This was achieved with a heavy eyelet (.17 oz) and two 1.25" washers (.25 oz each). I scuffed up the washers with some 50 grit and then cross-hatched with a hobby knife. I hope this is enough to give the epoxy some grip. [picture 2]

I filled the hole with epoxy (BSI 30 minutes) and put a layer on the nose cone shoulder. [picture 3]

I put on the first washer, than coated it with epoxy, laid on the second one, and then stuck in the eyelet. I finished things off by pouring a bit more epoxy in to the opening around the top of the eyelet. My objective is for all the pieces to be well-glued to each other, so the whole thing is one big mass and unlikely to come apart at ejection. I would prefer not to lose this particular nose cone.

Final result is picture 4.
Attached Thumbnails
Click image for larger version

Name:  Nose-weight-eyelet-2.jpg
Views: 13
Size:  819.6 KB  Click image for larger version

Name:  Nose-weight-eyelet-1.jpg
Views: 14
Size:  966.8 KB  Click image for larger version

Name:  Nose-weight-eyelet-3.jpg
Views: 12
Size:  779.6 KB  Click image for larger version

Name:  Nose-weight-eyelet-4.jpg
Views: 23
Size:  475.7 KB  
Reply With Quote
  #137  
Old 09-04-2018, 02:51 AM
blackshire's Avatar
blackshire blackshire is offline
Master Modeler
 
Join Date: Jan 2009
Location: Fairbanks, Alaska
Posts: 5,571
Default

NOW it's starting to look...dangerous (the same way an AIM-9L, or any pit viper does!). :-)
__________________
Black Shire--Draft horse in human form, model rocketeer, occasional mystic, and writer, see:
http://www.lulu.com/content/paperba...an-form/8075185
http://www.lulu.com/product/cd/what...of-2%29/6122050
http://www.lulu.com/product/cd/what...of-2%29/6126511
All of my book proceeds go to the Northcote Heavy Horse Centre www.northcotehorses.com.
NAR #54895 SR
Reply With Quote
  #138  
Old 09-05-2018, 09:51 PM
neil_w's Avatar
neil_w neil_w is online now
Mr. Cut-by-hand
 
Join Date: Nov 2015
Location: Northern New Jersey
Posts: 336
Default The discard pile

I once read an interview with a guy who built live steam locomotives from scratch. He recounted how someone from the town (or maybe it was the IRS, I can't remember) asked him what was the primary product of his metal shop. He replied "Scrap."

This build reminded me of that. Attached picture shows (most of) the discards from this build.
1) Full decal sheet ruined by contaminants in the clear coat
2) Tests of fabricating the body bands
3) Test piece for the final wing skirt construction technique, plus actuator fairing experiment and tail cone
4) Full set of wing cores, discarded because I realized I didn't need to use basswood and wanted to save the weight.
5) Two imperfect balsa wing cores.
6) First two experiments at fabricating the control fins with bulges.
7) Complete set of control fins, discarded because I decided I still hadn't gotten the shape of the bulge quite right. This set took a while to make, it hurt to chuck them, but the final set I used in the rocket is *so* much better so it was worth it.
8) Just another imperfect control fin
9) First test sanding an actuator fairing to shape.
10) Initial experiments fabricating the wing skirts with balsa. It came out OK but was a *huge* effort. Once it occurred to me to make the skirts from cardstock, I immediately abandoned this approach, and the end result is much much better as a result.

This rocket is about a hundred times better than it would have been had I not worked out some of the techniques first.
Attached Thumbnails
Click image for larger version

Name:  discards.JPG
Views: 16
Size:  869.9 KB  
Reply With Quote
  #139  
Old 09-05-2018, 10:52 PM
ghrocketman's Avatar
ghrocketman ghrocketman is offline
President, MAYHEM AGITATORS, Inc.
 
Join Date: Jul 2005
Location: Michigan
Posts: 8,800
Default

Sounds like WAYYYY too much work on a HOBBY rocket that could be destroyed on the first flight due to a cato, bonus delay, shotgun ejection charge, powr-prang, or failure to deploy.
I can understand if one is planning to compete in a scale contest or produce a kit.
Otherwise, nah.
__________________
When in doubt, WHACK the GAS and NEVER touch the brake !!!
No Harm=NO Foul advocate

If you are NOT FLYING LOW in the left lane, you need to GET THE #$&@ OUT of it !

Yes, there is such a thing as NORMAL
, if you have to ask, you probably aren't
!
Reply With Quote
  #140  
Old 09-19-2018, 09:58 PM
neil_w's Avatar
neil_w neil_w is online now
Mr. Cut-by-hand
 
Join Date: Nov 2015
Location: Northern New Jersey
Posts: 336
Default

Finished. Full photo set posted under Projects.

Thanks for following along.
Attached Thumbnails
Click image for larger version

Name:  iris-t-final - 1.jpg
Views: 15
Size:  680.9 KB  
Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump



All times are GMT -5. The time now is 10:40 AM.


Powered by: vBulletin Version 3.0.7
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
Ye Olde Rocket Shoppe 1998-2018