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From: Bulent Aliev <atlasyts@bellsouth.net>
Subject: Re: [FlyRotary] Re: Cowling and engine installation RV 7A
Date: Sat, 17 Feb 2007 18:37:19 -0500
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>

Al is forgetting again that we don't run no stinkin pistons :) Our  
engines are smooth unlike the old piston engine concept.
Buly
On Feb 17, 2007, at 12:31 PM, al p wick wrote:

> Absolutely NOT ok. So glad you asked the question. You can prove  
> this to
> yourself by shining adjustable strobe on the plumbing while the  
> engine is
> running. You will find the tubing bends significantly in response to
> various engine rpm. This will fatigue the tubing. This is called hard
> line plumbing. It increases your risk significantly. Ironically a  
> lot of
> guys will get away with it, some for a few years. It all depends on
> whether your plumbing length corresponds to natural frequency of the
> system. If you placed one or two supports on tubing, then that would
> limit which frequencies it responds to. Greatly reduce risk. Flexible
> line also dramatically reduces risk. I had a $million warranty  
> issue once
> where the engineer did the same thing you did. I use strobe at the
> science museum I work at to show patrons how things bend. It's so
> educational. I can rub my hand on metal bowl and it causes water to
> splash out of bowl onto patron's face. Just by controlling the rubbing
> frequency. I use strobe so they can see the metal deform from  
> vibration.
> My bowl has cracks in it now from fatigue.
>
> BTW, just excellent job on wiring. Lot's of wire ties control that  
> same
> vibration. Looks attractive.
>
> I'm a little puzzled by your plumbing routing. Why do you send that  
> line
> back to the other one?
>
>
> -al wick
> Cozy IV powered by Turbo Subaru 3.0R with variable valve lift and cam
> timing.
> Artificial intelligence in cockpit, N9032U 240+ hours from Portland,
> Oregon
> Glass panel design, Subaru install, Prop construct, Risk assessment  
> info:
> http://www.maddyhome.com/canardpages/pages/alwick/index.html
>
> Cozy IV powered by Turbo Subaru 3.0R with variable valve lift and cam
> timing.
> Artificial intelligence in cockpit, N9032U 240+ hours from Portland,
> Oregon
> Glass panel design, Subaru install, Prop construct, Risk assessment  
> info:
> http://www.maddyhome.com/canardpages/pages/alwick/index.html
>
> --
> Homepage:  http://www.flyrotary.com/
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