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Date: Sun, 18 Feb 2007 12:04:28 -0600
From: Dennis Haverlah <clouduster@austin.rr.com>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Cowling and engine installation RV 7A
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Correct - You got it right!
Dennis H.

Bill Schertz wrote:

> Al,
> His message says 'bypass line' , and from earlier discussions, some 
> builders put a bypass between high and low pressure with a small 
> orifice to bleed any air that might get in there without having to 
> develop full pressure. I see a flex fuel line going tothe other side 
> of regulator, which would be the high pressure supply, and the line 
> out the bottom looks like it goes back to the tank. The short line 
> just bypasses the regulator, and I assume has a small orifice to allow 
> pressure to bleed down.
>
> Bill B -- Am I correct on this?
> Bill Schertz
> KIS Cruiser # 4045
> ----- Original Message ----- From: "al p wick" <alwick@juno.com>
> To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
> Sent: Sunday, February 18, 2007 11:11 AM
> Subject: [FlyRotary] Re: Cowling and engine installation RV 7A
>
>
>> We have a strong tendency to make theoretical decisions. Why not pursue
>> the facts? There are a number of things you can do. If you could dig 
>> up a
>> strobe like I suggested, then you could actually see the tube bend. This
>> really improves understanding of what's happening.
>>
>> Another way to prove your theory is to ask the question "What do the
>> experts do in this situation?". Fortuntately, in this case we have
>> thousands of examples you can look at. Just go to local car dealer and
>> pop the hood of all the rotary Mazda's you can find. Hard plumbing fuel
>> lines is less expensive. Did they hard plumb, or did they install more
>> expensive hoses between components? Typically you will find they install
>> short length of rubber hose to reduce stress concentration of hard line.
>> You will also find they tie off all hard lines and wires every 6" or so.
>> This controls the frequency response of the components.
>>
>> Trying to save a life here Bulent, not trying to convert anyone to the
>> dark side. It looks like he's sending fuel return line directly back 
>> into
>> the fuel inlet. Very dangerous.
>>
>>
>> -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
>>
>>
>> On Sat, 17 Feb 2007 18:37:19 -0500 Bulent Aliev <atlasyts@bellsouth.net>
>> writes:
>>
>>> 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/
>>> > Archive and UnSub:
>>> http://mail.lancaironline.net/lists/flyrotary/
>>>
>>>
>>> -- 
>>> Homepage:  http://www.flyrotary.com/
>>> Archive and UnSub:   http://mail.lancaironline.net/lists/flyrotary/
>>>
>>>
>>
>>
>> -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
>>
>> -- 
>> Homepage:  http://www.flyrotary.com/
>> Archive and UnSub:   http://mail.lancaironline.net/lists/flyrotary/ 
>
>
>
> -- 
> Homepage:  http://www.flyrotary.com/
> Archive and UnSub:   http://mail.lancaironline.net/lists/flyrotary/
>