Today's Message Index:
----------------------
1. 03:55 AM - rpm-prop pitch- vne (Airgriff2@aol.com)
2. 12:48 PM - Re: rpm-prop pitch- vne (Duncan McFadyean)
3. 02:02 PM - Re: rpm-prop pitch- vne (B Johnson)
Message 1
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| Subject: | rpm-prop pitch- vne |
Hi gang, we have been running our Allegro 2000 LSA at around 4800 rpm in
cruise with our 100 hp 912. We see 4750 climbing out. Yesterday the winds
calmed a bit so I opened it up (straight & level) and got 5280. By rights we
should bump 5500 at that point ,I beleive. I'm thinking of reducing the pitch
to
bring up the rpm but here is the dilemma. Where it is set now gives us a
cruise of 125 mph which is very easy to see the vne of 138 at times. If I
repitch, I'm afraid we will end up running at lower rpm's in cruise to avoid the
high
speeds. So if I adjust the pitch to see 5500 WO S&L I dont want to run all
day at 4500 or so to keep the speed under vne ? Mabey the solution is to leave
it where it is ? What do you think ?
Fly Safe
Bob Griffin
Albany NY
Message 2
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| Subject: | Re: rpm-prop pitch- vne |
Interesting.
What prop are you using and at what setting?
With a 912S I see the same rpm on climb out (90mph), but get just under
(165mph)Vne at 5500 rpm. Europa + Warp Drive wide chord 64" set at 20.5
degrees (at the tip).
What's wrong with 4500rpm? I rarely run above that! (although there
seems to be a rough patch at 4200 to 4400 on mine, so I avoid that).
Duncan McF.
----- Original Message -----
From: Airgriff2@aol.com
To: rotaxengines-list@matronics.com
Sent: Friday, April 28, 2006 11:54 AM
Subject: RotaxEngines-List: rpm-prop pitch- vne
Hi gang, we have been running our Allegro 2000 LSA at around 4800
rpm in cruise with our 100 hp 912. We see 4750 climbing out. Yesterday
the winds calmed a bit so I opened it up (straight & level) and got
5280. By rights we should bump 5500 at that point ,I beleive. I'm
thinking of reducing the pitch to bring up the rpm but here is the
dilemma. Where it is set now gives us a cruise of 125 mph which is very
easy to see the vne of 138 at times. If I repitch, I'm afraid we will
end up running at lower rpm's in cruise to avoid the high speeds. So if
I adjust the pitch to see 5500 WO S&L I dont want to run all day at 4500
or so to keep the speed under vne ? Mabey the solution is to leave it
where it is ? What do you think ?
Fly Safe
Bob Griffin
Albany NY
Message 3
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| Subject: | rpm-prop pitch- vne |
What is the VNE for the experimental Allegro??????
-Bruce Johnson
Building an LSA Sonex, fly w/ a good friend in a 912s powered StingSport.
_____
From: owner-rotaxengines-list-server@matronics.com
[mailto:owner-rotaxengines-list-server@matronics.com] On Behalf Of Duncan
McFadyean
Sent: Friday, April 28, 2006 2:48 PM
Subject: Re: RotaxEngines-List: rpm-prop pitch- vne
Interesting.
What prop are you using and at what setting?
With a 912S I see the same rpm on climb out (90mph), but get just under
(165mph)Vne at 5500 rpm. Europa + Warp Drive wide chord 64" set at 20.5
degrees (at the tip).
What's wrong with 4500rpm? I rarely run above that! (although there seems to
be a rough patch at 4200 to 4400 on mine, so I avoid that).
Duncan McF.
----- Original Message -----
From: HYPERLINK "mailto:Airgriff2@aol.com"Airgriff2@aol.com
"mailto:rotaxengines-list@matronics.com"rotaxengines-list@matronics.com
Sent: Friday, April 28, 2006 11:54 AM
Subject: RotaxEngines-List: rpm-prop pitch- vne
Hi gang, we have been running our Allegro 2000 LSA at around 4800 rpm in
cruise with our 100 hp 912. We see 4750 climbing out. Yesterday the winds
calmed a bit so I opened it up (straight & level) and got 5280. By rights
we should bump 5500 at that point ,I beleive. I'm thinking of reducing the
pitch to bring up the rpm but here is the dilemma. Where it is set now
gives us a cruise of 125 mph which is very easy to see the vne of 138 at
times. If I repitch, I'm afraid we will end up running at lower rpm's in
cruise to avoid the high speeds. So if I adjust the pitch to see 5500 WO S&L
I dont want to run all day at 4500 or so to keep the speed under vne ?
Mabey the solution is to leave it where it is ? What do you think ?
Fly Safe
Bob Griffin
Albany NY
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