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From: "Greg Ward" <gregw@onestopdesign.biz>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-2771470@logan.com>
Subject: Re: [FlyRotary] Re: New (old) guy on list
Date: Fri, 29 Feb 2008 18:33:38 -0800
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I have been working close with the Cozy Girrls, and getting some good input 
from Ed and Lancair also.  Consensus as of today is to run the hoses outside 
of the fuselage, and enclose them with a removable wrap of some sort 
parallel with the fuselage air flow.  Reasons for this are, imagine a 
radiator leak in the cockpit at 12K feet, and the resultant condensation 
(Chrissi), and with all of the existing plumbing in the cockpit adding more 
would be a pain (Lancair), not to mention cutting more out of the fore and 
aft spar, a definite no-no.  I should be able to do the lines at 1" and less 
than about 4-5 feet in length.  From what I am hearing, it would improve the 
CG due to adding the 20B, we will see.
It goes on......
Greg
20B Lancair in Progress


----- Original Message ----- 
From: "Ernest Christley" <echristley@nc.rr.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Friday, February 29, 2008 1:42 PM
Subject: [FlyRotary] Re: New (old) guy on list


> Greg Ward wrote:
>> MessageI would also be really interested in seeing some others cooling 
>> solutions.  I was told that 40% of the Lancair's drag is in the cooling 
>> drag, and I am contemplating a belly scoop A la' P-51, and have created 
>> controversy about how much that configuration will add to the drag 
>> factor.  In other words, I might get great cooling at a slower speed? 
>> Supposedly the P-51 configuration creates enough thrust to overcome 
>> around 90% of the drag created, but I would like to confirm that before I 
>> go through the process of designing and building the damn 
>> thing.......(:-)  Call me lazy...
>> Greg Ward
>> 20B Lancair in Progress
>>
> My survey of the studies and anecdotal evidence that I could find, 
> indicate fairly conclusively that radiators inside the engine cowl is 
> about the worst possible option when considering cooling drag.  However, 
> for many it is the only option, and for most it is by far the easiest 
> option.  The planform of my project is completely different than most, 
> giving me a relatively easy option of installing the rads and ducting 
> within the wing's 18" thick airfoil.  I'm not even fantasizing that I will 
> wind up with net positive thrust, just confident that it won't be quite so 
> negative.
>
> With a conventional planform, how would you seperate the hot tube from the 
> fleshy parts of the airplane?  Long hose runs will be heavy, especially if 
> you use 1" hose to keep a reasonable flow.  And the placement of the 
> weight could possibly play havoc with your W&B (it was actually a slight 
> improvement for my situation).
>
> One thing is very clear, though.  If you can make it work, it'll be one of 
> the sweetest looking Lancairs on any field it visits.
>
> --
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