Today's Message Index:
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1. 03:50 AM - Re: RotaxEngines-List Digest: rpm-prop-pitch-vne (Icrashrc@aol.com)
2. 06:39 PM - Re: RotaxEngines-List Digest: rpm-prop pitch-vne (John M. Goodings)
3. 10:42 PM - Re: Re: RotaxEngines-List Digest: rpm-prop-pitch-vne (Horizonspace@aol.com)
4. 10:49 PM - Rotax 912 Package For Sale (Stan Bearup)
Message 1
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| Subject: | Re: RotaxEngines-List Digest: rpm-prop-pitch-vne |
I think what you're missing is the RPM specs from Rotax. As I recall 5500rpm
is max continuous rpm. I think 5800 rpm is time limited to 5 minutes. Most
people seem to set prop pitch for max of 5500 to avoid the short time rating.
--> RotaxEngines-List message posted by: "John M. Goodings"
<goodings@yorku.ca>
Gentlemen: I don't understand your numbers for the Rotax 912S, 100 HP,
gear reduction 2.43:1. I am fairly new to this game, so I go by the book.
My Rotax manual says maximum rpm = 5800 on climb-out at full power (80
mph, 1700 ft/min on a cool day); cruise at 5200 rpm. I had the blade
pitch set at 19.75 degrees; at full power, the engine reached nearly 6000
rpm when hot; cruise at 5200 rpm was about 105 mph; this amateur-built
aircraft has a slow cruise because of its thick airfoil. So I increased
the pitch to 19.5 degrees; it now reaches only 5600 rpm at full power;
cruise at 5200 rpm is about 110 mph. Presumably, I should decrease the
pitch a tad to achieve 5800 rpm at full power when the engine is hot. My
point is, it is my understanding that blade pitch should be adjusted to
achieve full power at 5800 rpm, and cruise power should be 5200 rpm; it is
not good for the engine to run too cool. And yes - avoid the rough spot
near 4200 rpm on these engines; it is hard on the gear reduction drive.
Some of what I am doing does not seem to be in line with what others are
reporting on this Rotax Engines List. Please enlighten me.
John Goodings, C-FGPJ, CH601HD Zodiac with R912S, GSC 68" 3-blade prop,
Toronto/Waterloo
Message 2
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| Subject: | Re: RotaxEngines-List Digest: rpm-prop pitch-vne |
--> RotaxEngines-List message posted by: "John M. Goodings" <goodings@yorku.ca>
This note is primarily an answer to David Joyce. Thank you, David, for
your reply to my post. You are right; I made a mistake (one of many,
perhaps!). Originally, my prop pitch was 18.75 degrees (not 19.75), and I
increased it to 19.5 degrees, causing a drop in DYNAMIC rpm in climb from
near 6000 at full throttle (of course, I never ran it over 5800) to 5600.
It seems to me that 5600 STATIC rpm should give about 5800 dynamic rpm in
flight; this is what I would like to achieve. I believe my airspeed
indicator is close to correct, checked against the GPS. I have mounted a
pitot tube (under the left wing) which incorporates a static pressure port
underneath, scavenged from a Piper aircraft; it has been very satisfactory
from day 1. This static pressure port gives correct altimeter readings,
as checked against my transponder and encoding altimeter. This avoids a
static pressure port on the side of the fuselage; on some aircraft, there
seems to be great confusion as to just where to place it!
John Goodings, C-FGPJ, CH601HD Zodiac.
Message 3
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| Subject: | Re: RotaxEngines-List Digest: rpm-prop-pitch-vne |
I would suggest that you also calibrate your RPM gauge. The Rotax gauges
have been known to be off by as much as 20 percent. Use a handheld gauge set
for the appropriate number of prop blades and adjust for gear box ratio.
Message 4
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| Subject: | Rotax 912 Package For Sale |
Hi gang!
I have a complete Rotax 912 UL engine package that came off of a low
time
Kitfox V available for sale. It is in excellent condition with only 297
trouble free hours since new. Included along with the engine is the
exhaust
system, with heat shrouds and carburetor heat airbox, new radiator, oil
cooler, oil tank, complete ignition system in a firewall mounted
shielded
aluminum box, and a GSC ground adjustable three-blade propeller. I do
not
have a Kitfox mount, but other than that, this package is ready to
install
and fly. I purchased the package a few months ago with intentions to use
on
my Just Aircraft Highlander that I am currently building, but have since
decided to go with a 125 HP Franklin 4A-235 engine. I am asking $9,000
firm.
Cheers!
Stan Bearup
www.justkitplanes.com
Stan@justkitplanes.com
(208) 220-0837
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