REFLECTOR: epoxy pump ratio

[Douglas Holub]

You got me curious, so I went and measured the weight ratio of the epoxy 
coming out of my pump. I pumped the handle 7 times simultaneously into two 
seperate dixie cups, then weighed them with a kitchen gram scale. The 
hardener cup weighed 54 grams; the resin cup weighed 111 grams. That comes 
out to .486 by weight. But then if you remember to subtract the weight of 
the dixie cups (3.5 grams) and calculate again, you get .470 hardener to 
resin.

I hope I can live with that (literally.) I always leave a little epoxy in my 
cups and give them the scratch test the next day.

Doug Holub
----- Original Message ----- 
From: "Steve Goldman" <steve at fatcatair.com>
To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>
Sent: Saturday, September 16, 2006 3:03 PM
Subject: Re: REFLECTOR: epoxy pump ratio


> lawrence epstein wrote:
>> is that ratio supposed to be by weight or volume??
>
> The measured ratio (.537) is by weight. So my understanding is that
> the volume ratio is 47/100 and by weight is 44/100. Not that
> I'm close to either.
>
> -- 
> Steve Goldman
> '77 Tiger N28531
> Velocity XL5-RG (T-3485hrs)
> Pittsboro, NC (9NC8)
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