Received-SPF: none
 receiver=logan.com; client-ip=68.230.241.27; envelope-from=steve@stevet.net
Mime-Version: 1.0 (Apple Message framework v752.2)
In-Reply-To: <list-1315004@logan.com>
References: <list-1315004@logan.com>
Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed
Message-Id: <31B7BDDB-EE47-4CE5-B312-B6494121220C@stevet.net>
Content-Transfer-Encoding: 7bit
From: Steve Thomas <steve@stevet.net>
Subject: Re: [FlyRotary] Re: More cooling Tests
Date: Tue, 25 Jul 2006 11:16:29 -0700
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>

Steve,

Do you have any information on how effective the ceramic coating has  
been?  Did you see any noticeable reduction in cowl temps as a result?

Best Regards,

Steve Thomas

________________________________________________________________________

On Jul 25, 2006, at 4:57 AM, Steve Brooks wrote:

> Bob,
> For your exhaust, you may want to consider ceramic coating.  I had my
> exhaust pipe coated by a company called Jet-Hot.  As I recall it  
> only cost
> about $50 to do mine, but it's only about 18" long, coming from the  
> turbo.
>
> Here is their web link:
> http://www.jet-hot.com/
>
> What I got was the Jet-Hot 2000 coating, which is good to 2000  
> degrees.
> Mine has held up very well, and shows no signs of deterioration.
>
> Steve Brooks
>
>
> -----Original Message-----
> From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]On
> Behalf Of Bob White
> Sent: Tuesday, July 25, 2006 1:30 AM
> To: Rotary motors in aircraft
> Subject: [FlyRotary] Re: More cooling Tests
>
>
> Thanks Dave,
>
> The fuel return to the tank is the next item on my todo list.  The  
> tank
> developed a leak so I have to open it up anyway.  It seemed like the
> right time to fix it.
>
> The exhaust system is a large can with a tube thru the middle that
> supplies cooling air (theoretically) so the temps on the down tube
> should be lower than normal for a rotary.  However, it's still too hot
> for this material, whatever it is.
>
> I hope I haven't given the impression that I'm flying yet.  This is  
> all
> taxi and static stuff. :(  I am getting pretty close though.
>
> I hope you are doing well.  I check your blog occasionally and I'm
> glad I don't have to deal with the temps shown in your July 13  
> photo.  I
> could probably get close in Phoenix some days.  Best of luck and hope
> the rest of your tour passes quickly.
>
> Bob W.
>
>
>
> On Tue, 25 Jul 2006 07:43:51 +0400
> "David Leonard" <wdleonard@gmail.com> wrote:
>
>> Hi Bob,
>>
>> I can tell from experience that even most stuff that is intended  
>> to go
>> directly onto exhausts will quickly desintigrate in the rotary.   
>> The stuff
>> that is supposed to be good up to 1400 deg will start falling  
>> apart after
> a
>> few hours.  That stuff you have will be done after the first flight.
>> Don't forget that your exhaust temps will go above 1600!
>>
>> I did find some exhaust wrap that was good up to 2000 deg. and it  
>> is good
>> for about 100 hrs before becoming a little brittle and falling  
>> off.  It
> was
>> worth it and made a big difference in my under cowl temps, but it  
>> was not
>> cheap.
>>
>> As for your fuel system....   I am sure SOMEONE has said this  
>> before (I
> have
>> not been reading the list very regularly because I am in Iraq), so  
>> let me
>> repeat for effect.  RETURN THAT FUEL ALL THE WAY TO THE TANK!    
>> One of the
>> great things about this high flow fuel injection system is that it is
>> possible to essentially eliminate ANY chance of vapor lock.  Vapor  
>> lock
>> HAPPENS even in certified planes.  It is serious. It can be  
>> fatal.  Route
>> that fuel back to the tank and it basically can't happen.... you  
>> have a
>> better system than a typicl lyc set-up.  Route that fuel back to  
>> the pump
>> and you may even be making things worse than a lyc set up.
>>
>> Sounds like you have decided to make a change, so this is just to
> re-enforce
>> that decision and send the message to anyone else considering the  
>> easy way
>> out for fuel return....
>>
>> JMHO, & congratas on getting flying by the way! cant wait to see  
>> it in
>> person some day..
>>
>> Dave Leonard
>>
>>
>> On 7/25/06, Bob White <rlwhite@comcast.net> wrote:
>>>
>>> I finished putting a layer of insulation around the exhaust  
>>> system.  I
>>> placed thermocouples in a few key locations.  One inside the
>>> insulation, one outside, and one on the fuel rail.  OAT was 80-85F.
>>>
>>> I ran the engine at 2200 rpm until the temps stabilized at 197  
>>> oil and
>>> water.  I increased rpm's to 3100 and temps went up to 200 oil  
>>> and 207
>>> water. They were still increasing very slowly.  I can taxi at  
>>> 3100 rpm
>>> or less and getting a little movement should help cooling.  Also,  
>>> when
>>> I reduced power back to 2200 rpm, the temps started decreasing.   
>>> So on a
>>> not too hot day I think the cooling will be OK for taxiing.
>>>
>>> The insulation is a layer of reflective insulation I bough at the  
>>> speed
>>> shop that is good to 1000F.  It has a metalized layer on each  
>>> side and
>>> some kind of fibrous layer on the inside.  (The stuff itches like
>>> fiberglass when you get it on you.)  At the end of the test, the
>>> thermocouple on the inside layer was reading 235F and the one in the
>>> same place on the outside of the insulation was 167F.
>>>
>>> I still don't have the fuel return to the tank.  It's going directly
>>> back to the fuel pump input.  So the fuel rail temps were getting
>>> pretty high.  The fuel rail was 145F and the engine was starting  
>>> to run
>>> a little rough, presumably due to incipient vapor lock.
>>>
>>> Next step is to open the tank and install the fuel return line.   
>>> I ran
>>> the line from the firewall to the wing root this afternoon, so  
>>> the easy
>>> part is done.
>>>
>>> Bob W.
>>>
>>> --
>>> http://www.bob-white.com
>>> N93BD - Rotary Powered BD-4 (first engine start 1/7/06)
>>> Custom Cables for your rotary installation -
>>> http://www.roblinphoto.com/shop/
>>>
>>> --
>>> Homepage:  http://www.flyrotary.com/
>>> Archive and UnSub:   http://mail.lancaironline.net/lists/flyrotary/
>>>
>>
>>
>>
>
>
> --
> http://www.bob-white.com
> N93BD - Rotary Powered BD-4 (first engine start 1/7/06)
> Custom Cables for your rotary installation -
> http://www.roblinphoto.com/shop/
>
> --
> 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/
>