how much foam?

[luisdeleon]

well it looks like i'm going to just defoam my ski so i don't know how much to get. Can anyone help? bare with me guys i am a newbie and this is my first sn build.


thanks

luis

 

[Matt_E]

You need 4-5 cubic foot of foam.
The 5 cuft kit of 3lb foam that US Composites sells is perfect.

 

[Frosty]

You need 4-5 cubic foot of foam.
The 5 cuft kit of 3lb foam that US Composites sells is perfect.

that's what i used on my SN a few years back... the back end felt heavy to me though. anyone ever use the 2lb kit? I was thinking about doing this on my new RN project, and adding a little extra reinforcement under the tray.

 

[Matt_E]

The difference between foaming with the 2lb and 3lb kit will be less than 5lbs.

 

[Frosty]

The difference between foaming with the 2lb and 3lb kit will be less than 5lbs.

really? that's it? aight cool...

 

[Matt_E]

2lb/cuft * 4.5cuft = 9lbs
3lb/cuft * 4.5cuft = 13.5lbs
4lb/cuft * 4.5cuft = 18lbs

 

[Frosty]

ok, so one more question then...

2 lb foams saves 4.5 lbs of total weight - but structurally how would it hold up against a rider's weight and pounding on it? i mean 4.5lbs is 4.5lbs... LOL

 

[Matt_E]

Several people have run with 2lb foam without any issues.
Proper mixing is the key.
I've seen 3lb foam that was absolutely ********ty because it wasn't mixed right.

 

[Mark44]

ok, so one more question then...

2 lb foams saves 4.5 lbs of total weight - but structurally how would it hold up against a rider's weight and pounding on it? i mean 4.5lbs is 4.5lbs... LOL

It will work fine like Matt said mixing is key.

Mark44

 

[sjetrider]

temperature and humdity place a huge part in the expansion rate of any foam. I have mixed in summer time the same as winter and had different results, can be frusterating for sure.

 

[Frosty]

Several people have run with 2lb foam without any issues.
Proper mixing is the key.
I've seen 3lb foam that was absolutely ********ty because it wasn't mixed right.

It will work fine like Matt said mixing is key.

Mark44

cool... thanks... what's optimum temp/humidity? I did my SN in the winter in the shop heated with a wood burning stove, about 85 degrees in there... low humidity...

 

[Matt_E]

Make sure both liquids are warm. If they're cold they are hard to mix and won't expand right.
I usually microwave both cups I am about to mix.

 

[Mark44]

DO NOT USE ANY KIND OF HEAT GUN ON THE FOAM. Bad things happen FAST!

Mark44

 

[sjetrider]

:dunno:The stuff seemed to work best in warm /humid conditions for me.

 

[Matt_E]

DO NOT USE ANY KIND OF HEAT GUN ON THE FOAM. Bad things happen FAST!

Mark44

LOL....I said microwave and warm, not heatgun and flame.:bigok:

 

[Crab]

They reccomend 70 degrees, worked great in my heated shop at that temp.

 

[Mark44]

o

LOL....I said microwave and warm, not heatgun and flame.:bigok:

LOL yea I know. LOL I gad a bad experience getting a heat gun to close to some foam while working on some foot holds.at:

Mark44

 

[Matt_E]

You make a good point. That foam is indeed very flammable.
Be careful.


Safety dance.

 

[D Slicker]

I used 2lb in my red ski but and using 4lb on my new one. I know it will cost me 5lbs but I want the added strengh.

 

[Matt_E]

It'll cost you 9-10lbs. :biggthumpup: