Today's Message Index:
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1. 07:20 AM - Control tube construction (Jack T. Textor)
2. 08:05 AM - Re: Control tube construction (Cuy, Michael D. (GRC-RXD0)[ASRC])
3. 04:18 PM - Re: Adhesive comparison test results (MikeD)
Message 1
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| Subject: | Control tube construction |
Freezing cold here, great day to work on the Piet. Where the control
stick ears or tabs fit over the control tube, the plans show a 3/8 piece
drilled for a =BC bolt that acts as a bearing which goes through and is
welded to the control tube. Do I drill the ears or tabs with a =BC hole
to fit over the bearing or drill them with a 3/8 hole to fit up flush
with the bearing? Assuming the tabs fit over the bearing they will have
to be spread apart to fit after the bearing is welded into the control
tube. Sorry this is not very clear.
Jack
www.textors.com
Message 2
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| Subject: | Control tube construction |
Hello Jack,
You drill the tabs for the bolt size of 1/4 inch to match the ID of the
drilled 3/8" OD bearing tube that you welded into your control tube.
I welded the 3/8" tube in place with excess length so I could custom
grind/saw/file/sand it to fit the corresponding gap or opening
in the tabs coming off my control stick. (s) Your question was quite
clear I thought !
Mike C.
Message 3
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| Subject: | Re: Adhesive comparison test results |
gbowen(at)ptialaska.net wrote:
> Mike, little off topic for wood laminations and Pietenpols but if you'd
> like to try a rubber modified laminating resin system (off the shelf), that
> has some of the best properties for handlaminates try Hexcel's (now
> HBFuller) 2315. Think Epoxical (now Endurance in St.Paul) making same
> formula. First it's based on a bis-F epoxy but this epoxy is pre-adducted
> with Hycar rubber. The liquid rubber precips out when cured and makes a two
> phase laminate. Our test, before HB Fuller bought-out the Resins group,
> indicated this was one of our best systems. I used it on my Cozy IV, 60 min
> gel time, kinda hot exotherm when floxed too thick, but best stuff for
> laminates that need to resist flex cracking. Scaled Composites used a bunch
> of it for their contract drones work.
> Gordon
That is exactly the type of adhesive system we used to make, and yeah the rubber
modifiers when used right sure do wonders for mechanicals. We used a variety
of aliphatic amine curatives, 3 in particular, blended in varying proportions
for different jobs, but in general so that cure rate was as rapid as possible
without excessive exotherm. The basic blends were epoxy resin (Dow 362), Hycar,
reactive diluent, wetting agent and defoamer, plus silica and fumed silica
in the structural adhesive variations, both flowable and thixotropic.
Now that I don't do that gig anymore, it's good to know a commercial system exists
with the same formulating goals in mind.
--------
Piet-builder-who-hopes-to-be-flying-next-summer
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http://forums.matronics.com/viewtopic.php?p=151375#151375
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