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Messages - D

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31
Hangar Flying / Cozy/other engine hardpoints on a Long EZ?
« on: October 07, 2005, 08:42:32 AM »
Waiter -- Nope, I'm starting from scratch.  I have all of the parts ready for bolting/bonding but all of my hand-wringing has kept me from drilling holes and mixing epoxy.  I have clamped those 1" extrusions in the chop saw a couple of times... but I chickened out and ordered the 1.5's before I made any sparks.

Drew -- Thanks for the link!  Have you seen/heard about anyone that has built/installed these things?  The second solution is certainly attractive if I stick with the "plans" route.

D

32
Hangar Flying / Cozy/other engine hardpoints on a Long EZ?
« on: October 06, 2005, 07:59:05 PM »
Thanks for the feedback, Waiter.

I figured the 1.5s were a "'cause it works!" mod for the bigger engines, too.  I certainly won't argue with the proven hours-in-service.  Those are more valuable to me than a paper analysis, anyway.

For clarity, I didn't intend to mess with the bolted/bonded joints between the spar and longerons.  :shock:   That's WAY above my pay grade.  I 'simply' wanted to chop the extrusions where they penetrate the firewall and incorporate nice, clean, flush, Cozy-like, firewall hardpoints instead.  You know... waste a bunch of valuable time/energy trying to make a "rounder" wheel instead of getting this bird nearer to first flight.   :wink:

I guess I'm off to install those 1.5s...

D

33
Hangar Flying / Cozy/other engine hardpoints on a Long EZ?
« on: October 06, 2005, 01:41:45 AM »
Hi all - I'm new to the list (as a builder) and am searching for insight on engine mount hardpoints, extrusions, and the like for my 320-powered EZ-to-be.

In pure bass-ackwards fashion, I immediately purchased 1"x1" Al angle to hang my engine per the plans... THEN I selected an engine (non-plans 320) and bought some 1.5"x1" Al angle.  Now, I have a pile of aluminum angle and a little voice in my head saying "Uhhrrr... maybe you oughta rethink this whole 'aluminum angle' thing."

After trading my bank account for extruded aluminum, I began wondering why the extrusion went from 1"x1" to 1.5"x1"?  Was it based on some arbitrary comment made by RAF folks long ago regarding bigger engines?  Is it backed up by any engineering/analysis?  Why not 2"x1", or 3"x1"?  Why not 4130 or another material?  Then I thought "Hey!  What sorta extrusions are the other non-235 designs using to hang their big engines?"

What I found was that the other designs (e.g. - Aerocanard, Berkut, Cozy) DON'T use Al extrusions.  Instead, they use embedded firewall hardpoints and bolts in tension to hang their bigger engines.  Embedded hardpoints, bolts in tension, a clean/updated design -- the voice in my head is pleased.

So... are there any "You gotta use Al angle because..." claims that I'm unaware of?  Have any Long/Vari folks replaced those Al angles with hardpoints & bolts?  Do any Aerocanard/Berkut/Cozy folks hate the hardpoint & bolt setup?  Any tips/hints/specifics on the layup schedule on those designs?  Should I be prepared to weld up a custom engine mount regardless?  Does anybody need some aluminum angle!??         :wink:

D

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