glass weight for boat layup

[not2bright]

what size glass cloth should i use when i lay up my sport 20 and 1/8 scale hull?

Joel Hanson

 

[Climate Models]

You should use multiple layers.

I would say 2 layers of 10 Oz for the sport 20. Or one 10 oz. and one 6 oz. if you want it light.

1/8 scale should be a bit stronger. I would make it from 3 layers of 6 oz.

Others may have a different idea.

Peter R.

www.climatemodels.com

 

[Lake S.P.O.R.T.]

Another quick reference of cloth size other than just weight is the size of the weave. More than 1/8 inch weave and you are getting into a size cloth that is too heavy and will hold more resin than needed for an RC boat. I have been using 1/16 inch for years, cloth on cloth lamination with zero problems. Three other things to remember when laminating a boat. 1.The shape of what you are building can have a major influence on its strength. A deck with a lot of crown and feature lines will need fewer layers to add strength. A cowling that constantly curves and has no flat areas has "stand alone" strength and stiffness and will need no overlaps or additional bracing. 2. The deck and cowling are not slapping the water like the running surfaces, so any cloth overlaps and/or additional layers should be positioned in the running surfaces or in the long flats such as the afterplane bottom. Using lightweight cloths such as 6-8 oz. 2 to 3 layers with a couple more in the running surfaces would be a good start. 3. It is important to remove any excess resin from the laminate for a good strength to weight ratio. The first glass boat that I built, it took me a couple of hulls to get the best combination of strength and weight. Hope this helps.

Mark

 

[not2bright]

wow i thought two layers of 3 oz cloth would be ideal. i guess i was way off

Joel Hanson

 

[Pat Bristol]

If your using epoxy for your lay up ( no gelcoat ) I always start with a layer of 2oz cloth first. This will help so the weave from the heaver cloth wont print though to the surface and look like a checker board on your finished part.