Received-SPF: none
 receiver=logan.com; client-ip=206.225.166.167; envelope-from=jwhaley@datacast.com
From: Jeff Whaley <jwhaley@datacast.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: RE: #1 rotor cutting out
Thread-Topic: #1 rotor cutting out
Thread-Index: AQHNCIe31pqW6iKBw0e6XrrdiuU5pg==
Date: Thu, 22 Mar 2012 23:58:45 +0000
Message-ID: <234B758DE9A64449BEB6BB5D1345CA7AF10D99@mbx026-e1-nj-6.exch026.domain.local>
Accept-Language: en-CA, en-US
Content-Language: en-CA
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: quoted-printable
MIME-Version: 1.0

Well Mark, I'm no expert but I always look at what I modified last for clue=
s to what might be wrong now.
Is it possible that 2:3 new TBs are working great and one is not?
Just a thought ...  Jeff


From: Mark Steitle <msteitle@gmail.com>
Subject: Re: [FlyRotary] Re: #1 rotor cutting out
Date: Thu, 22 Mar 2012 16:32:44 -0500
To: Rotary motors in aircraft <flyrotary@lancaironline.net>


Kelly,

Yes, the slide throttle is history, mainly because,

1) I concluded that the location of the primary injectors being upstream fr=
om the slide was causing puddling of the fuel and surging, and hence poor l=
ow speed/idle characteristics, although this was not a problem at mid to WO=
T.  I could have relocated the primary injectors but there were other issue=
s as well (see 2 through 5)

2) I suspected cross-feed from one port to the next during low throttle ope=
rations, although I couldn't verify that was happening I felt it may be con=
tributing to the rough operation mentioned above,

3) It dripped fuel upon shutdown, not a lot, but it caused me some concern,

4) the nature of the design prevented me from balancing the individual roto=
rs, and

5) it required a modest force to operate; the new TB's are silk smooth.

I located a triple-set of like-new 46mm 1 BBL throttle bodies from a Sea Do=
o or snowmobile that looked like  would work with very little modification.=
  It required a new throttle shaft to be fabricated since it was one piece =
and the spacing was wrong for the 20B, but Bob Darrah and his Bridgeport we=
re happy to help me with that.  I'm very happy with the end result.

The nature of the p-port necessitated the TB's to be located very close to =
the ports, else I would have gone with a larger single TB feeding into an a=
irbox like most have done.  Not sure that wouldn't work here, but I've read=
 that with the p-port engine the TB should be as close as possible to the p=
orts.  These TB's have the injector bungs cast into the body just downstrea=
m of the butterfly, exactly as I needed.  Low end performance has improved =
considerably.  I just need to figure out why the #1 rotor cuts out in mid-r=
ange.

Mark S.

This message, and the documents attached hereto, is intended only for the a=
ddressee and may contain privileged or confidential information. Any unauth=
orized disclosure is strictly prohibited. If you have received this message=
 in error, please notify us immediately so that we may correct our internal=
 records. Please then delete the original message. Thank you.