VansAirForceForums  
Home > VansAirForceForums

- POSTING RULES
- Donate yearly (please).
- Advertise in here!

- Today's Posts | Insert Pics

  #101  
Old 01-24-2019, 04:02 PM
9GT's Avatar
9GT 9GT is offline
 
Join Date: Jan 2010
Location: Southern Michigan
Posts: 1,631
Default

You can get dacron polyester fabric from just about any local fab store in various weights. When we were building the two Cozy MKIV's at my house, I would even find it on clearance once in a while in the Walmart fabric center for .99 cents a yard. If you use a fabric with a dyed pattern, it will sometimes bleed through though and leave the pattern on your fiberglass part!
__________________
David C.
Howell, MI

RV-9A: Under Construction.
RV-10: Completed 12/29/2013 SOLD 08/23/2016

"Donor Exempt" but donated through Dec. 2020
Reply With Quote
  #102  
Old 01-24-2019, 05:45 PM
MonkeyWrench MonkeyWrench is offline
 
Join Date: Mar 2018
Location: VA
Posts: 11
Default

Hi guys. One more question for you all. The term micro bubbles is used a lot. It seems like a generic term. It looks like it just means small glass bubbles. Is it safe to say that the 3M GLASS BUBBLES on ACS is the same thing as the generic micro bubbles?

3M GLASS BUBBLES
https://www.aircraftspruce.com/catal...es/bubbles.php

I'll be using West Systems (I did see Dan's original note on the pumping of the product). Will probably just poor it.

However, West Systems has all kinds of speciality 400 series fillers.
https://www.aircraftspruce.com/catal...stemManual.pdf

It seems that you can obtain the same level of finish as the West Systems 400 series fillers by using micro bubbles and varying the amount micro bubbles you add.

Thanks all!
__________________
Rich
RV-14A
working on empennage
EAA Chapter 186
Reply With Quote
  #103  
Old 04-12-2019, 05:32 AM
DanH's Avatar
DanH DanH is offline
 
Join Date: Oct 2005
Location: 08A
Posts: 8,736
Default

Sorry Rich, missed your question.

Microballoons are generally available in glass (white) and phenolic (dark red). They are the basic ingredient in almost all lightweight fillers.

The West line of fillers incorporate additional ingredients, most of which are equally common (for example, talc, styrene, and wood fiber). Obviously different blends impart different properties. In my opinion, those property changes are of little value to homebuilders. For sure the West blends are very expensive compared to stocking the shop with ordinary glass micro, flox, and cabosil.
__________________
Dan Horton
RV-8 SS
Barrett IO-390
Reply With Quote
  #104  
Old 06-05-2019, 02:05 PM
ksdflying ksdflying is offline
 
Join Date: Mar 2018
Location: Antioch, Tennessee
Posts: 81
Default

Wow. Just wow Dan H. Can't give enough appreciation to you for you posting this thread. This is just awesome.
Thank you for the details and the photos!!
__________________
Dan K. RV-8 kit purchased 2014, build started Jan 2018, Slow build Emp. done - March 2018, Slow build Wings done -Oct 2018, QB Fuselage started - Sep 2018...
Avionics Panel arrived! - Jan 2019. Beautiful job by the excellent Co. in Billings MT!
Setting avionics finally - April 2019. Engine in hand.
Prepping and waiting for final Finish kit to arrive - June 2019
VAF dues paid!
Reply With Quote
  #105  
Old 08-14-2019, 09:40 PM
czechsix's Avatar
czechsix czechsix is offline
 
Join Date: Mar 2006
Location: Spring Hill, KS
Posts: 344
Default How many plies to glass empennage tips to aluminum?

For those who have glassed in their empennage tip fairings to get the seamless look, how many plies and what ply weight worked well? I like the look but want to minimize weight, and this isn't structural....but a single layer of very thin glass might crack over time due to vibration and different thermal expansion rates between the fiberglass tip fairing and adjacent aluminum surface. So I'm particularly interested to hear from those who have been flying for a while (what has -- or hasn't -- held up over time?).

Thanks,
__________________
Mark Navratil
Spring Hill, KS
RV-8A N2D #80583 - built/flew/sold
RV-14A #140017 - wings complete, empacone in progress...
Reply With Quote
  #106  
Old 08-15-2019, 08:09 AM
DanH's Avatar
DanH DanH is offline
 
Join Date: Oct 2005
Location: 08A
Posts: 8,736
Default

Quote:
Originally Posted by czechsix View Post
For those who have glassed in their empennage tip fairings to get the seamless look, how many plies and what ply weight worked well?
No fabric plies at all. Tips bonded with Hysol, riveted wet, gaps filled with micro. Still doing fine at 875 hours.
__________________
Dan Horton
RV-8 SS
Barrett IO-390
Reply With Quote
  #107  
Old 08-15-2019, 12:05 PM
czechsix's Avatar
czechsix czechsix is offline
 
Join Date: Mar 2006
Location: Spring Hill, KS
Posts: 344
Default

Quote:
Originally Posted by DanH View Post
No fabric plies at all. Tips bonded with Hysol, riveted wet, gaps filled with micro. Still doing fine at 875 hours.
Wow, that's amazing...I'm really surprised that you haven't seen any hairline cracks show up where the micro meets the edge of the aluminum skin!

Thanks,
__________________
Mark Navratil
Spring Hill, KS
RV-8A N2D #80583 - built/flew/sold
RV-14A #140017 - wings complete, empacone in progress...
Reply With Quote
  #108  
Old 08-15-2019, 03:32 PM
DanH's Avatar
DanH DanH is offline
 
Join Date: Oct 2005
Location: 08A
Posts: 8,736
Default

Quote:
Originally Posted by czechsix View Post
Wow, that's amazing...I'm really surprised that you haven't seen any hairline cracks show up where the micro meets the edge of the aluminum skin!
So I'm told. It's an experiment, and may explode any minute.

So, more than a decade ago, why did I think it would work? Here's reality. The tips are cheap polyester glass. The coefficient of thermal expansion is about 14 microinches per inch per degree F. The coefficient for aluminum is typically around 13....no significant difference to drive cracking. Plus the polyester glass is inside the aluminum flange, and evenly bonded (i.e. evenly stressed), not fastened at individual points. I could have drilled out the pop rivets after the Hysol cured.

Check back in another 800 hours. I'll keep the crow in the freezer.
__________________
Dan Horton
RV-8 SS
Barrett IO-390
Reply With Quote
  #109  
Old 08-26-2019, 10:40 AM
MS19087's Avatar
MS19087 MS19087 is offline
 
Join Date: Nov 2006
Location: West Chester, PA
Posts: 597
Default Which Hysol is recommended?

Quote:
Originally Posted by DanH View Post
No fabric plies at all. Tips bonded with Hysol, riveted wet, gaps filled with micro. Still doing fine at 875 hours.
Dan - There are many Hysol variants out there- what is the recommended Hysol product for this application?

Thanks!
__________________
Mark
RV-9A; N91RV Sold
RV-14A; building
2019 =VAF= donor
Reply With Quote
  #110  
Old 08-26-2019, 11:56 AM
DanH's Avatar
DanH DanH is offline
 
Join Date: Oct 2005
Location: 08A
Posts: 8,736
Default

Quote:
Originally Posted by MS19087 View Post
Dan - There are many Hysol variants out there- what is the recommended Hysol product for this application?Thanks!
9430 is fine.
__________________
Dan Horton
RV-8 SS
Barrett IO-390
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 -6. The time now is 10:26 PM.


The VAFForums come to you courtesy Delta Romeo, LLC. By viewing and participating in them you agree to build your plane using standardized methods and practices and to fly it safely and in accordance with the laws governing the country you are located in.