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mtherr(at)yahoo.com
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 Posted: Wed Mar 29, 2006 8:01 pm Post subject: EA-81 RPM |
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I had a discussion with my machine shop this evening
about the way we use our engines. He was comparing
flying engine usage with (speed) boat engine usage.
Normally, I take off with 4500-4600 rpm (65 to 70
mph). Then, I cruise at 4300-4500 rpm. At level
flight, I get 4950 max rpm.
How is it for those of you guys using Soob engines on
CH601s?
The machine shop guy is telling me it is easier on
engine heads to rev at higher speed with less torque
and load than to be too much loaded at lower speed.
Michel CH601-HD; 177 hours since Oct 5, 2004
----------------------------
Michel Therrien CH601-HD, C-GZGQ
http://mthobby.pcperfect.com/ch601
http://www.zenithair.com/bldrlist/profiles/mthobby
http://pages.infinit.net/mthobby
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larry(at)macsmachine.com
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| Posted: Thu Mar 30, 2006 8:24 am Post subject: EA-81 RPM |
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Hi Michel,
I was told that the EA-81 Subaru has been revved supercharged to 10,000 rpm
and they hold together, so I take off at 4900 rpm, climb to altitude at
95 mph,
let off as EGTs climb thru 1400 deg f. I cruise at 125 if needed at
4800 rpm.
It does 5100 rpm maxed out with 17-deg on the prop, its top end is 133 mph.
Flying locally, I prefer low to mid range rpms of 4200 to 4500 to save
fuel at
105 to 115 mph. I think the Subaru will last longer if one conserves
rpms in
cruise, but don't understand a corelation between loading at low or high
speeds.
There doesn't seem to be any one rpm that doesn't work well in the
Subaru but
for the point where belt climb is noticed. Havn't had any of that of
lately.
Power loading would seem to even out if the mixtures are correct through
the full range. This is probably quite different from a Subaru in a car
where
power loading is linked more to inertia and the engine heads work more
against the tires on the street.
Larry McFarland - 601HDS at 85.8 hours
Michel Therrien wrote:
| Quote: |
I had a discussion with my machine shop this evening
about the way we use our engines. He was comparing
flying engine usage with (speed) boat engine usage.
Normally, I take off with 4500-4600 rpm (65 to 70
mph). Then, I cruise at 4300-4500 rpm. At level
flight, I get 4950 max rpm.
How is it for those of you guys using Soob engines on
CH601s?
The machine shop guy is telling me it is easier on
engine heads to rev at higher speed with less torque
and load than to be too much loaded at lower speed.
Michel CH601-HD; 177 hours since Oct 5, 2004
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kellymeiste(at)jcwifi.com
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| Posted: Sun Apr 02, 2006 10:45 am Post subject: EA-81 RPM |
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| Quote: | Normally, I take off with 4500-4600 rpm (65 to 70
mph). Then, I cruise at 4300-4500 rpm. At level
flight, I get 4950 max rpm.
How is it for those of you guys using Soob engines on
CH601s?
|
| Quote: | Michel CH601-HD; 177 hours since Oct 5, 2004
|
++++++++++++++++++++++++++++++++++
Michel,
I normally fly my Stratus EA-81 as follows:
Take off = 4,500 RPM
Cruise = 4,000 RPM (approx 95 MPH)
Kelly Meiste
601 HD (135 hrs)
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