Guestimating weight added by fiberglass

Guestimating weight added by fiberglass

Post by Stephe » Fri, 30 May 2003 20:29:57



How much weight is usually added when 2 layers of 6 oz. glass and a 1.4 ox.
veil are added to a 34" LOC 54mm Paper tube?

--
Stephen Corban
NAR# 81338
GYRO# 1
If you build it, they will come
www.geocities.com/ilrocketboy
Tripoli Quad Cities

 
 
 

Guestimating weight added by fiberglass

Post by Stephe » Fri, 30 May 2003 20:51:42


Also, does a 34" long piece of 54mm tube really weigh 9 oz.? More than it's
Phenolic counterpart?

--
Stephen Corban
NAR# 81338
GYRO# 1
If you build it, they will come
www.geocities.com/ilrocketboy
Tripoli Quad Cities

Quote:
> How much weight is usually added when 2 layers of 6 oz. glass and a 1.4
ox.
> veil are added to a 34" LOC 54mm Paper tube?

> --
> Stephen Corban
> NAR# 81338
> GYRO# 1
> If you build it, they will come
> www.geocities.com/ilrocketboy
> Tripoli Quad Cities


 
 
 

Guestimating weight added by fiberglass

Post by Larry W. Hardi » Fri, 30 May 2003 21:55:06


The weights of glass cloth are per square yard and do not include the epoxy
resin.
The holy grail of fiberglass layup is to achieve a 60/40 weight distribution
(glass/
epoxy) but 50/50 may be more conservative.  Figure how many square yards of
surface area you have and multiply by 13.4 to get the weight of the cloth only
and
then double that to get the weight of the cloth plus epoxy.  You'll only
achieve
this if you squeege out all excess resin or vacuum bag it.

My calculations are as follows :

LOC 54mm tube has an OD od 2.16" which gives a circumference of 6.754"
The 34" length gives a surface area of 229.65 sq-in or 0.177 sq-yd.  Thus we
should have a weigh of 0.177 sq-yd * 13.4 oz/sq-yd * 2 = 4.75 oz.

Larry Hardin

Quote:

> How much weight is usually added when 2 layers of 6 oz. glass and a 1.4 ox.
> veil are added to a 34" LOC 54mm Paper tube?

> --
> Stephen Corban
> NAR# 81338
> GYRO# 1
> If you build it, they will come
> www.geocities.com/ilrocketboy
> Tripoli Quad Cities

 
 
 

Guestimating weight added by fiberglass

Post by AkaZil » Fri, 30 May 2003 23:16:21


Aloha,
Precut your cloth after seeing how much is needed. Then add that same weight in
resin.

Take Care,
Larry

 
 
 

Guestimating weight added by fiberglass

Post by David Weinshenke » Sat, 31 May 2003 00:38:42


Quote:

> How much weight is usually added when 2 layers of 6 oz. glass and a 1.4 ox.
> veil are added to a 34" LOC 54mm Paper tube?

From some experiments I did ago with hand layups, approximately double
the dry weight of the cloth to get the total weight including the resin
too.

-dave w