Re: [ULF-1] Modern Adhesives vs Plan callouts

From: Member 72
Date: 2018-03-26 17:57 UTC-04:00
Message: #0543

Hi Austin,

Welcome to the Build forum!  We built all the airframe components on our ULF-1 NT/E (stands for new technology and electric motor powered) with System 3, T-88.  We searched far and wide and decided on this epoxy.  The only thing we did not like was the delta T on this glue.  When you heat it up (needs to be heated up a lot!), it loosens up.  Now this can come in handy when you make a mistake and have to take
something apart!  Saves having to rebuild a whole assembly in some cases.  We also liked that T-88 was a little bit more flexible when compared to West Systems epoxy.  We mixed up all our epoxy by weight using an electronic gram scale.  If you use too much hardener for example, the glue will set up way too soft.  Where we had to thicken the T-88 we used cotton flox which is structural.  We are using West Systems epoxy on all the fiberglass parts such as the spoilers and fittings.

Hope this helps!
Member 72 

Sent from my iPhone

> On Mar 26, 2018, at 4:23 PM, Member 111 <[email]> wrote:
> 
> Hi again everyone. 
> 
> I’ve noticed that the plans call for aerodux resorcinol urea formaldehyde glue in the construction of ribs and even the spar cap laminations. I’ve read of some other builders substituting T-88 for all adhesives in the aircraft, and wanted to get other ULF-1 builders’ take on the question. 
> 
> Also, several parts of the build manual call out “thickened” epoxy, but do not state the ratio of thickener to epoxy. The use of cotton flakes which I take to mean flox is also mentioned. Does Dieter intend to refer to what ratio system 3 or West Systems recommend? 
> 
> Austin
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