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Subject: Re: [FlyRotary] Re: First lift off with single rotor
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From: Tracy <rwstracy@gmail.com>
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Date: Mon, 9 Jul 2012 16:09:41 -0600
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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Depends on throttle setting and mixture.   I see anywhere from 1450 to 1750.=
=20

Tracy

Sent from my iPad

On Jul 9, 2012, at 1:05 PM, "Bill Bradburry" <bbradburry@bellsouth.net> wrot=
e:

> Egts on my Renesis would be low at 1600. They consistently run in the 17s.=
 =20
>=20
> Bill B
>=20
> -----Original Message-----
> From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On
> Behalf Of Ernest Christley
> Sent: Monday, July 09, 2012 2:57 PM
> To: Rotary motors in aircraft
> Subject: [FlyRotary] Re: First lift off with single rotor
>=20
> Tracy wrote:
>> My guess is that it is not excess pressure that is the problem.   (we all=

> wish we had more MP available  : ).  =20
>> One possibility is  turbulence around the mouth of the carb,  had that
> happen on hod rods in my younger days.   I turned the air scoop on carb
> around backwards  and problem went away.  You running an air cleaner or
> other intake plumbing that helps smooth the airflow at the entry of carb? =
 =20
>> Better yet, go EFI which isn't sensitive this problem!
>>=20
>=20
> I could see this causing a blockage to airflow and the resulting mixture
> going rich, but unless Richard is starting LOP,
> how does that jive with the EGTs running up to 1600?
>=20
>> Tracy
>>=20
>> Sent from my iPad
>>=20
>> On Jul 9, 2012, at 10:36 AM, "Richard Sohn" <res12@fairpoint.net> wrote:
>>=20
>>>=20
>>> -----Original Message----- From: Ernest Christley
>>> Sent: Monday, July 09, 2012 11:12 AM
>>> To: Rotary motors in aircraft
>>> Subject: [FlyRotary] Re: First lift off with single rotor
>>>=20
>>> Richard Sohn wrote:
>>>> Cleared the ground for a brief period today. As far as the airplane is
>>>> concerned, everything is good. CG seems to be right on the spot. Much
>>>> better as it was 12 years ago at the first flight with the SOOB.
>>>> Here is the reason why it was not a flight. A few days ago when I
>>>> started high speed taxi, as soon as it picked up air speed, the engine
>>>> started to sputter and almost cut out totally. This was at the same RPM=

>>>> as at a run up, where it does not do that. With a wiggly tail dragger a=
s
>>>> the Avid is, there was no way reading enough instrument for making a
>>>> preliminary analysis. I recorded the instrument panel with a GoPro at
>>>> 2sec intervals.
>>>> Looking at the first pictures, the answer came up right away, increasin=
g
>>>> pressure under the cowl where the intake for the engine is located. Lik=
e
>>>> the EGT shot up over 1600 just before the sputtering started. Since my
>>>> radiator air is going to the outside of the cowling, there was no impac=
t
>>>> on cooling. Btw cooling is really good. At an OAT of 95F, oil and water=

>>>> stayed at around 170F no matter what I did.
>>>>=20
>>>> For todays runs, I taped the inlet around the prop hub shut. Sure
>>>> enough, the sputtering occurred at higher airspeed, and was not as
>>>> total, however, EGT was still going to around 1600.
>>>>=20
>>>> The conclusion is, I have to open the cowling exits a lot.
>>> I don't get it.  The pressure under the cowl sounds like it would be a
> good thing, because it sounds like it is enough
>>> to cause the engine to lean out.  If the cooling isn't a problem, why
> wouldn't you just enrichen the mixture to
>>> accommodate the extra air and accept the increase in power?
>>>=20
>>> Ernest,
>>>=20
>>> I am not using electronic fuel injection. My fuel system operates pretty=

> much like a carb with mixture control. In addition, I would not want to ha=
ve
> to adjust the mixture when changing the air speed.
>>> Your comment certainly reflects one advantage of EFI.
>>>=20
>>>=20
>>> Richard Sohn
>>> N2071U
>>>=20
>>> http://www.fairpoint.net/~res12/home.html
>>>=20
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>>=20
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>=20
>=20
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>=20
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