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bakerocb
Joined: 15 Jan 2006
Posts: 727
Location: FAIRFAX VA
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 Posted: Tue Oct 27, 2009 8:33 am Post subject: KIS TR-1 Air Speeds |
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10/27/2009
Hello Tim, You wrote:
1) "What altitude and RPM were you at 140 K?"
I was at 2,000 feet MSL. My RPM nudged above 2,800 RPM a few times (it was
bumpy) so I had to throttle back a bit. Then when I leaned the engine out a
bit the RPM went back up near 2,800.
I don't have enough nose down trim at higher airspeeds and heavier loads so
I had to hold a lot of forward stick pressure. When I anticipate flying fast
and with a heavy load I normally tape an aluminum trim tab on my elevator to
help out -- I had not done that yesterday. I'll try again one of these days
with the tab taped on.
2) "What is your max RPM and speed?"
Well it looks like my max RPM is very close to 2,800 RPM and I may have to
throttle back to keep it at that limit. Right now I would say that my max
speed is an indicated 140 knots. I don't spend a lot of time looking at high
speed numbers because I am not in a hurry to get anyplace.
I envision that my cross country cruise (if I ever do go any place) is going
to be at 2550 RPM with a fuel flow of 7.5 gallons per hour. Don't know what
that is going to yield in the way of airspeed -- maybe around 135 knots
indicated.
3) "PS: Anything new from Jesse?"
Nothing recent from Jesse.
OC
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bakerocb
Joined: 15 Jan 2006
Posts: 727
Location: FAIRFAX VA
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| Posted: Wed Oct 28, 2009 8:56 am Post subject: KIS TR-1 Air Speeds |
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10/28/2009
Hello Tim, You wrote:
1) "Are our props that much different?"
My Prince P-tip prop is 68 inch diameter with 69 inch pitch. I get a static
RPM of about 2,100 at full throttle. It would appear that you have a bit
more of a cruise pitch prop while mine is a bit more towards the climb pitch
side.
2) "My elevator trim tab is MAC driven and I can trim for level flight at
low and high power settings ......."
I don't have an elevator trim tab. My pitch trim is a MAC driven spring bias
system connected to the elevator push rod. The system could be adjusted a
bit to give me some more nose down trim, but even then I don't know if I
would have enough trim travel to cover my complete range of airspeeds. Since
I do most of my flying puttering around locally at low airspeeds (helps save
fuel) I live with my present trim system adjustment and tape on the
supplemental nose down aluminum tab when I want to go fast or have a heavy
load. I am usually flying locally at 2,000 RPM with a fuel flow of around 4
gallons per hour, this gives me 100 knots indicated. Down wind leg in the
landing pattern is at 1,800 RPM with 90 knots indicated.
3) "I extended my elevator the 1" as recommended by Rich and Vance circa
1996."
I also extended the trailing edge of my elevator.
'OC' Says: "The best investment we can make is the effort to gather and
understand knowledge."
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