Re: [bolger] Re: fibreglass on PVC

djost@...wrote:

> This is a really cool idea!
>
> What diameter pvc pipe would you use for a 23' mast? Will this mast be
> as strong as a laminated wooden spar?
>
> Cost wise, I know its more. But reliability and weight issues would
> tilt the scale towards this solution.
>
> David Jost
> Micro "Firefly" under 2 feet of snow!
>
>
> Bolger rules!!!
> - no cursing, flaming, trolling, or spamming
> - no flogging dead horses
> - add something: take "thanks!" and "ditto!" posts off-list.
> - stay on topic and punctuate
> - add your comments at the TOP and SIGN your posts

Pound for pound I have always been told that wood is stronger than
fiberglass in bending loads. Tension is where it shines.

HJ


--

_ _ _ _ _
% Harrywelshman@...
Hi All,
You guys may want to check out the below site for information on
building a fiber glass mast, using a foam core. it's a great source of
information covering construction as well as reinforcing the mast.
http://www.geocities.com/Yosemite/3387/mast.htm
I hope this helps,
Stan, Snow Goose
This is a really cool idea!

What diameter pvc pipe would you use for a 23' mast? Will this mast be
as strong as a laminated wooden spar?

Cost wise, I know its more. But reliability and weight issues would
tilt the scale towards this solution.

David Jost
Micro "Firefly" under 2 feet of snow!
Hi,
 
I am interested in trying this.  What weight glass cloth
would you reccommend?
 
Thanks in advance.
 
James Fuller
 
----- Original Message -----
Sent:Wednesday, February 07, 2001 4:00 AM
Subject:[bolger] fibreglass on PVC

How to make a fibreglass mast.  Masts are good for boats to ,say 16
ft. Select right length and diameter of PVC . wax  and polish with
mold release wax, then pva mold release.  wind first layer of 2 or 3
inch tape up the mast, then apply resin. wind next layerof tape
diagonally opposite to say 3/4 up the mast, 3rd layer to a bit over
1/2 way. If mast is stayless perhaps a 4th layer to 1/4 the hieght.
If a boom is going to press against an area this should be externally
built up. Epoxy resin would be stronger. us a fast hardener to reduce
slumping of the resin. When cured, soak in water to dissolve pva,
remove pvc pipe and seal ends with foam plug and fibreglass. these
masts are particularly light and strong.
   Meanwhile Waltzing matilda is crawling along due to me working
instead as this weekend I,m sneaking off to the coast to crew on
the 'Leeuwin' for an afternoon as they needed volunteer crew . 8 hrs
driving for 3 hrs sailing. bargain.
   Couple of new photos to amuse. She'se starting to look like a 1.5
metre boat.
   cheersfor now
   Paul Day  waltzing matilda. 



Bolger rules!!!
- no cursing, flaming, trolling, or spamming
- no flogging dead horses
- add something: take "thanks!" and "ditto!" posts off-list.
- stay on topic and punctuate
- add your comments at the TOP and SIGN your posts

How to make a fibreglass mast. Masts are good for boats to ,say 16
ft. Select right length and diameter of PVC . wax and polish with
mold release wax, then pva mold release. wind first layer of 2 or 3
inch tape up the mast, then apply resin. wind next layerof tape
diagonally opposite to say 3/4 up the mast, 3rd layer to a bit over
1/2 way. If mast is stayless perhaps a 4th layer to 1/4 the hieght.
If a boom is going to press against an area this should be externally
built up. Epoxy resin would be stronger. us a fast hardener to reduce
slumping of the resin. When cured, soak in water to dissolve pva,
remove pvc pipe and seal ends with foam plug and fibreglass. these
masts are particularly light and strong.
Meanwhile Waltzing matilda is crawling along due to me working
instead as this weekend I,m sneaking off to the coast to crew on
the 'Leeuwin' for an afternoon as they needed volunteer crew . 8 hrs
driving for 3 hrs sailing. bargain.
Couple of new photos to amuse. She'se starting to look like a 1.5
metre boat.
cheersfor now
Paul Day waltzing matilda.