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Date: Fri, 21 Jan 2005 18:21:00 -0500
Subject: Re: [FlyRotary] Re: Pport/cold side injectors
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From: Jerry Hey <j-winddesigns@thegrid.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
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I would not decide based on today's  "speculations."   We need to do 
some real testing.   No  harm in putting injector bosses on the runners 
just in case.   Jerry


On Friday, January 21, 2005, at 06:07  PM, George Lendich wrote:

> Jerry,
> I wanted the injectors over the cold side, same as you - however there 
> is
> much compelling arguments to go to the hot side.
>
> I have decided to do an extended 180 degree bend (extended from the 
> engine
> that is) and shoot the fuel straight in, from the bottom of the bend.
>
> For your info.
> George (down under)
>
>> Ernest, that your analysis is impressive. I've just reread it again.
>> I'm committed to trying with the cold side injectors  but if it does
>> not work,  I will understand why.  The upside is that if they don't
>> work we can lay the   idea to rest,  accept hot side fuel as the only
>> way  and work on making it safe through proper shielding.   This is 
>> one
>> of the "little" things us p porters have to work out.    Thanks,  
>> Jerry
>>
>>
>>
>>
>> On Friday, January 21, 2005, at 11:04  AM, Ernest Christley wrote:
>>
>>> On Fri, 2005-01-21 at 10:23, Ed Anderson wrote:
>>>> Wow! Ok, Ernest
>>>>
>>>> Certainly sounds plausible that long runners would contribute to the
>>>> separation of the wheat and chaff.  I wish I could remember what my
>>>> professors taught me in those long ago days. Perhaps if I had day
>>>> dreamed
>>>> less and studied harder......Nah!!!
>>>>
>>>
>>> I took only one other thing away from that class.
>>>
>>> What has LEAD got to do with octane?  It's a metal.  It doesn't burn.
>>> Why would anyone put it in their gas?
>>>
>>> Well, it turns out, the light (less carbons per chain) molecules are
>>> easier to atomize (convert to a semi-gaseous state by spraying 
>>> through
>>> a
>>> small orifice).  If you want a nice compact carberator/intake system,
>>> you need lots of those short chains.  The down side is, those short
>>> chains don't have a lot of energy and tend to want to burn on there 
>>> on
>>> when exposed to the pressure inside a cylinder.  What you want is
>>> something that will atomize like the short chain, but burn smoothly
>>> like
>>> the medium length ones.
>>>
>>> Enter LEAD, stage right.
>>>
>>> Lead has four bonding points.  Mix some with your gas, and each lead
>>> atom will attach to one end of 4 different carbon chains.  Remember,
>>> the
>>> chain only burns when the end is exposed to oxygen?  Well, now one 
>>> end
>>> is locked down.  If the fuel started out as pure mixture of 4 carbon
>>> chains, and you mixed just the right amount of lead, you'll end up 
>>> with
>>> a batch of molecules shaped like a plus sign (+).  Each arm of the 
>>> plus
>>> will be 4 chains long.  The oxygen can only get at the ends, so this
>>> mixture will burn like 100 Octane (ie, 100% Octane).
>>>
>>> And my last point.  Higher octane is not always better.  High octane 
>>> is
>>> good for turbo applications, because is has a slower burn rate.  But
>>> you
>>> want the burn to occur so that the maximum pressure is in the chamber
>>> at
>>> the highest torque point of the cylinder/rotor rotation.  Not before
>>> and
>>> not after.  If you're running exceedingly high RPM in a non-turbo
>>> application, LOWER octane may actually produce more power.  In this
>>> situation, the higher octane stuff may still be burning well into the
>>> exhaust cylce.
>>>
>>> Now, I'm done.  My brain is empty.
>>>
>>>>>  Homepage:  http://www.flyrotary.com/
>>>>>  Archive:   http://lancaironline.net/lists/flyrotary/List.html
>>>
>>
>>
>>>>  Homepage:  http://www.flyrotary.com/
>>>>  Archive:   http://lancaironline.net/lists/flyrotary/List.html
>>
>
>
>
>>>  Homepage:  http://www.flyrotary.com/
>>>  Archive:   http://lancaironline.net/lists/flyrotary/List.html
>