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1. 03:23 PM - Re: [esqualtalk] Re: Pilot Report - Lightning (N1BZRich@aol.com)
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| Subject: | Re: Pilot Report - Lightning |
Dave,
Let me jump in here and ask a few questions. Do you have gear leg
fairings (Van's RV style)? Those alone are good for at least 10 mph if not more.
Do you have the latest style Van's RV wheel pants? Those will give you at
least another 10 mph - well 10 to 15 above not having any wheel pants on. I
am not sure what they would add over the stock Esqual pants, but probably at
least half of that. I never flew my airplane with Esqual pants on. So if the
answer to the above questions is no, they we have identified at least 20
mph. Another thing that cleaning up the gear legs and wheels will do it give
your engine additional rpm. With the lower drag profile with the fairings on,
the engine does not have to work as hard. Besides the 20 plus mph increase
in speed, you will probably pick up at least 200 rpm - if not more.
My airplane will run an easy 150 TAS at 5000 feet on 2850 rpm. At 3250
I am seeing 180 mph TAS along now (hot outside - density altitude more like
6700' when at 5000 msl), but last winter I was seeing 185 mph TAS when at
5000.
The big unknown for my airplane is how many mph is the Lightning cowling
worth. Once again, I never flew it with an Esqual cowling. What I do
remember is that at 5000' (last winter - and with a fixed 53 inch pitch) before
I
put on gear leg fairings or wheel pants my max speed was 165 mph TAS. Based
on what you are seeing, does that mean that the Lightning cowling is good for
15 mph. Maybe it is, but without us both using the same prop, it would be
hard to say for sure.
As to your EGTs, do all six exhaust have probes? I do, and some of them
are slightly closer to the exhasut outlet just because of the way the
exhaust manifold is shaped. My hotest EGT at 5000' last winter (OAT 53 degrees
F)
was about 1450 at 2850 rpm. It went up to 1475 between 2900 and 2950 rpm,
and then started down as rpm increased from that point. Remember, I don't have
a muffler, so that might have some impact.
Hope this helps some.
Blue Skies,
Buz
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