## Glass finish weight

### Glass finish weight

Anyone have an estimate of how much weight a fiberglasss/epoxy, prime
and paint finish will weight?  Assume .6 oz/yd glass.

Pete Foss
Chief Flight Instructor and Webmaster
Skymasters RC of Michigan
http://www.geocities.com/CapeCanaveral/Lab/4031/

### Glass finish weight

|> Anyone have an estimate of how much weight a fiberglasss/epoxy, prime
|> and paint finish will weight?  Assume .6 oz/yd glass.
|>
|>
|> Pete Foss
|> Chief Flight Instructor and Webmaster
|> Skymasters RC of Michigan
|> http://www.FoundCollection.com/

How big a plane? I added about 12-14 oz to the weight of my
Royal B-17 (804 sq. inches of wing area) with that finish method.

Bob
--
-------------------------------------------------------------------------
Bob Klenke, Ph.D., Principal Scientist  Dept. of Electrical Engineering
University of ***ia
http://www.FoundCollection.com/.***ia.edu/~rhk2j      C***tesville, VA 22903-2442
-------------------------------------------------------------------------

### Glass finish weight

Quote:

> Anyone have an estimate of how much weight a fiberglasss/epoxy, prime
> and paint finish will weight?  Assume .6 oz/yd glass.

> Pete Foss
> Chief Flight Instructor and Webmaster
> Skymasters RC of Michigan
> http://www.geocities.com/CapeCanaveral/Lab/4031/

I use a rule of thumb that says that a properly applied glass finish
will weigh about twice as much as a film finish.  I have never measured
it but weighing other kits finished weight seems to bear this out.
Either way, the glass is much stronger and the finishes available are
fantastic.  I glass all my planes now.
--
Paul McIntosh
remove the <NOSPAM> from my e-mail
Please check my web site at:
www.dancris.com/~warbird

### Glass finish weight

Quote:
>Anyone have an estimate of how much weight a fiberglasss/epoxy, prime
>and paint finish will weight?  Assume .6 oz/yd glass.

I think it is more a function of skill than anything else. My first
attempts at fiberglass and paint were VERY heavy but I've seen others
do it reguarly at near the same weight as monokote.

I think vacuum bagging helps tremendously as it sucks out all the
extra epoxy.

Sorry this does not answer your question ... kind of raises a

Cheers,

Peter
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### Glass finish weight

Quote:

>|> Anyone have an estimate of how much weight a fiberglasss/epoxy, prime
>|> and paint finish will weight?  Assume .6 oz/yd glass.
>|>

>    How big a plane? I added about 12-14 oz to the weight of my
>Royal B-17 (804 sq. inches of wing area) with that finish method.

A little bit bigger.  I'm building a Stafford B-24 which is a 90" wing
vs the 77" Royal.  It's one of the reasons I picked it over the Royal
4 years ago when I started the plane.
Pete Foss
Chief Flight Instructor and Webmaster
Skymasters RC of Michigan
http://www.geocities.com/CapeCanaveral/Lab/4031/

### Glass finish weight

Quote:

>Anyone have an estimate of how much weight a fiberglasss/epoxy, prime
>and paint finish will weight?  Assume .6 oz/yd glass.

Pete,

Well, at least you are concerned with the weight! Many simply glop on
the glass and resin, and are surprised that the plane lands so hot and
glides like a brick.

The short answer is about a pound for an average .60 size plane,
depending on your skill. This is enough to cause a good flying plane
to fly like a brick.

Fiberglass is one of the main cause of the dreaded "weight
escalation". That's when you find that your engine is not strong
enough, so you put a bigger, heavier one. Of course, this requires a
bigger mount. At this time you often find that the landing gear are no
longer strong enough, so you put heavier gear. Now the hot landings
cause the screws to pull out of the mounts, so you have to put lots of
plywood there to beef it up. And on, and on.... and next thing you
know, you have a flying cow.

Nearly everyone goes through the glassing stage, and nearly everyone
goes back to shrink film. Wish I had skipped the fiberglass stage
myself....it brings back some not too fond memories. For example a
scrape or bruise is hell to fix looking decent.

Of course some war birds look best with fiberglass and paint, so if
you are a scale builder, do not be discouraged by my warnings.

Best of luck

Bob