Today's Message Index:
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1. 07:03 AM - Re: Speeds vs. RPMs (flylightning)
2. 03:19 PM - EGT and CHT (GARY PENNINGTON)
3. 04:18 PM - Re: EGT and CHT (Tex Mantell)
4. 05:42 PM - Re: EGT and CHT (Mark Stauffer)
Message 1
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Buz,
We have a 62 56 here for sport that we could of used for testing, actually 2
of them and I forgot that they were here, I think I am getting old and
forgetful. Oh and we did get one of the 62 60s yesterday. We will start some
testing with the 56 first since blanks put it on already and than we will
get some numbers with the 60
nick
_____
From: owner-lightning-list-server@matronics.com
[mailto:owner-lightning-list-server@matronics.com] On Behalf Of
N1BZRich@aol.com
Sent: Tuesday, October 14, 2008 10:33 PM
Subject: Lightning-List: Speeds vs. RPMs
All,
Sometime within the last week or so I got a message directly to me
asking some questions about actual speeds vs. RPMs at 2,500 feet.
Unfortunately I deleted the message (not on purpose) and don't remember who
sent it. However, I did get a chance to run a few numbers on today's flight
and the specific results are below. So whoever asked the question, here is
your answer:
N31BZ was at 2,500 feet MSL, density altitude was 3,880', with an OAT of
77 degrees F.
2850 rpm = 150 mph true airspeed and 142 mph indicated. fuel flow = 5.0
gph
2950 rpm = 156 mph true airspeed and 156 mph indicated. fuel flow = 5.6
gph
3050 rpm = 163 mph true airspeed and 153 mph indicated. fuel flow = 6.4
gph
And for "World Record" Earl, 150 mph = approximately 130 kts
156 mph = approximately 136 kts
163 mph = approximately 141 kts
Now some other thoughts:
-Of course, true airspeeds will go higher as altitude increases, but the
person that asked the question wanted some figures at the lower altitudes -
specifically 2,500 feet. When I am on a trip at 10,000 feet or so, I
normally cruise at 165 to 170 true and burn about 6 gph up there. As I have
mentioned before, my cross country technique is to set my fuel flow and
accept what ever rpm and speed that gives me at the altitude I am at.
-For those of you that are still trying to decide if you want fuel flow, I
highly recommend it. Not only for cross country work, but for use as a
second "fuel quantity" system. Tell the EIS how much fuel you have when you
fill up and the fuel flow then subtracts that much as you use it and you
always know how much you have total (you must kind of guess which tank has
how much of the total). This method, at least for me, is much more accurate
than the fuel quantity gauges in the tanks.
-Your Lightnings (not EAB Lightnings that are set up to meet light sport
requirements) should be a little faster once you get the proper prop
installed and we all know that Nick is still working on that. For example
the prototype runs about one or two mph faster than 31BZ the way both are
currently equipped (gear leg farinings and Lightning style wheel pants), but
we are waiting on a 62FK60 for both planes. The prototype currently has a
prop that is marked as a 62FK58 but it measures closer to a 59 inch pitch.
N31BZ is still running a 64ZK55. Now if Sensenich will just send us the two
62FK60s that have been on order for the past 20 years or so.
-In any case, other than the correct prop, the key to going fast is building
your airplane light and straight, and attention to detail on the airframe
(clean up mods, getting the fairings and pants on straight).
-Perhaps this info will also be helpful to "rimorbod" (mcpc@wp.pl) since no
one really answered his question from about a week ago.
Blue Skies,
Buz
_____
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Message 2
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Hello everyone
Does anyone have info and/or photos of how and where to install the CHT
and EGT sensors?
Thanks in advance for your help.
Gary Pennington
Message 3
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Gary, go to the Jabiru web site and under tech tips it shows the CHT
install.
----- Original Message -----
From: GARY PENNINGTON
To: lightning-list
Sent: Wednesday, October 15, 2008 6:19 PM
Subject: Lightning-List: EGT and CHT
Hello everyone
Does anyone have info and/or photos of how and where to install the
CHT and EGT sensors?
Thanks in advance for your help.
Gary Pennington
Message 4
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Gary,
CHT
Remove the plug on the EXHAUST side of the head (as you look at a bank of
heads, i.e. 1,3,5 they are the plugs on the right. Same goes for 2,4 6.).
- Remove the washer and note the orientation (the beveled side goes
toward the head)
- Place the CHT probe on the spark plug and re-install the washer
- Torque the spark plug to 8 ft lbs
EGT
Measure along the exhaust pipe 120mm from the head - not the
flange on the exhaust pipe
Drill a #30 hole. It helps to punch the hole to keep the
drill from walking
Install probe using supplied hose clamp
Hope this helps.
Mark
From: owner-lightning-list-server@matronics.com
[mailto:owner-lightning-list-server@matronics.com] On Behalf Of Tex Mantell
Sent: Wednesday, October 15, 2008 6:18 PM
Subject: Re: Lightning-List: EGT and CHT
Gary, go to the Jabiru web site and under tech tips it shows the CHT
install.
----- Original Message -----
From: GARY PENNINGTON <mailto:pennington@q.com>
Sent: Wednesday, October 15, 2008 6:19 PM
Subject: Lightning-List: EGT and CHT
Hello everyone
Does anyone have info and/or photos of how and where to install the CHT and
EGT sensors?
Thanks in advance for your help.
Gary Pennington
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