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Message-ID: <4BC4A54A.4040709@canardaviation.com>
Date: Tue, 13 Apr 2010 13:09:30 -0400
From: John Slade <jslade@canardaviation.com>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Fuel Burn Rate
References: <list-4219950@logan.com>
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 >What kind of RPM are you cruising at?
Typically about 5300.
 >Are you running any boost at cruise
Good question that I don't really know the answer to :(.
Boost comes automatically with throttle and I tend to concentrate on 
different inputs depending on which phase of flight I'm in (as you do in 
IFR). On take-off I'm on the boost gauge. I limit boost to 42 - 44 MAP 
with throttle. In climb I fly on the temp gauges, probably around 38 
MAP. At cruise it's kinda "is what it is" and not very relevant to 
operations unless it gets out of reasonable range. If I'm cruising at 
12,500 I'm probably at around 28 - 30 MAP and there's a bit of boost 
bringing my MAP up, but I don't know how much. I could calculate it, but 
haven't. I took a bunch of MAP and OAT readings at various rpm / 
altitudes, but I don't recall what they were. They should be in my web 
site somewhere.

 >I know you have had enough scares with the fuel system.
of my own making, yes, but I've always had a "spare" fuel system to fall 
back on and can claim zero glider time. Ed can keep his title. My last 
episode was caused by filter blockage on one side, made worse by my 
inadvertently turning off one set of injectors. This is the only way I 
can explain the doubled rpm indication. Knowing I had minimal fuel in 
the side that wasn't blocked, had a great controller on my side, and was 
surrounded by bad weather I decided to get on the ground NOW and didn't 
pay much attention to solving the problem. Lessons learned - remember to 
switch tanks every 1/2 hour. Be careful which switches you hit if/when 
the engine stumbles.
 
Regards,
John

David Moyer wrote:
> What kind of RPM are you cruising at? Are you running any boost at 
> cruise, or just using it more for takeoff and climb. Good plan on 
> keeping at least 5 gallons in each wing. I forget how much unusable 
> fuel is in the tanks, but that would still leave you with some margin. 
> I know you have had enough scares with the fuel system.
>
> Thanks for the info.