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davemader(at)bresnan.net
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 Posted: Sun Jan 22, 2006 6:25 pm Post subject: Sensenich prop & not enough pitch? |
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After 20 hrs. on my newly completed rv6, I am undecided as to what to do as
far as changing the pitch of my Sensenich fixed pitch prop. At full throttle,
I am seeing 2850 rpm. and nearly 2450 static. I have an 0-360 with 9.5
compression pistons and supposedly it puts out close to 195 h.p. The tach has
been checked with an optical tachometer and is accurate. The climb rate right
now is close to 2000 fpm and top speed is over 210 mph. I like the
performance, just not sure I want to live with the higher rpms. I know I can
throttle back to stay under red line, but am I then limiting my horsepower?
Would my climb rate suffer much with more pitch? Anybody else had this
situation and repitched? Just looking for some feedback.
Dave Mader
2nd 6/20hrs.
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sportav8r(at)aol.com
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| Posted: Sun Jan 22, 2006 6:35 pm Post subject: Sensenich prop & not enough pitch? |
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Dave: repitching, like FP props themselves, is a mixed bag. I was running over redline too easily with my Sensenich after upgrading the O-320 to the 160 hp pistons, (2600 rpm) so I took it to Sensenich Prop Service in Lancaster, PA and added 2". Much less overspeeding in gradual descents from cruise, but a lower ROC and static now 2150-2200 depending on the wind, baro, etc, which is also down a good 50-75 rpm. The tradeoffs were exactly what I was told to expect. I get about 1300 fpm solo; plenty for me, but not much by RV standards. The red warning light for rpm no longer comes on much in 75% cruise, which makes the wife happier somoehow.
-Stormy
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ronlee(at)pcisys.net
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| Posted: Sun Jan 22, 2006 9:32 pm Post subject: Sensenich prop & not enough pitch? |
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| Quote: | I am seeing 2850 rpm. and nearly 2450 static.
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Full throttle where? 8000' density altitude? That is where I get
2700 RPM at full throttle.
Ron Lee
Do not archive
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davemader(at)bresnan.net
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| Posted: Sun Jan 22, 2006 11:47 pm Post subject: Sensenich prop & not enough pitch? |
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Ron
I guess I haven't figured density altitude. Full throttle at between 6 &
7000' on 40/50 degree days.
Dave
On Sun, 22 Jan 2006 22:31:04 -0700
Ron Lee <ronlee(at)pcisys.net> wrote:
| Quote: |
>I am seeing 2850 rpm. and nearly 2450 static.
Full throttle where? 8000' density altitude? That is where I get
2700 RPM at full throttle.
Ron Lee
Do not archive
|
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khorton01(at)rogers.com
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| Posted: Mon Jan 23, 2006 4:23 am Post subject: Sensenich prop & not enough pitch? |
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On 22 Jan 2006, at 21:24, DAVE MADER wrote:
| Quote: |
After 20 hrs. on my newly completed rv6, I am undecided as to what
to do as
far as changing the pitch of my Sensenich fixed pitch prop. At
full throttle,
I am seeing 2850 rpm. and nearly 2450 static. I have an 0-360 with
9.5
compression pistons and supposedly it puts out close to 195 h.p.
The tach has
been checked with an optical tachometer and is accurate. The climb
rate right
now is close to 2000 fpm and top speed is over 210 mph. I like the
performance, just not sure I want to live with the higher rpms. I
know I can
throttle back to stay under red line, but am I then limiting my
horsepower?
Would my climb rate suffer much with more pitch? Anybody else had
this
situation and repitched? Just looking for some feedback.
|
If you need to throttle back to keep the rpm where you want it, then
you are sacrificing a lot of power. In this case, a bit more pitch
should yield better cruise performance, as you would make more power
in cruise with the higher throttle opening that you could use. The
climb rate will decrease a bit, but it should still be quite
acceptable. Given that you spend a lot more time in cruise than you
do climbing, it may be worthwhile to sacrifice the climb to improve
the cruise.
Sensenich should be able to work with you to determine how much pitch
change is needed.
Kevin Horton RV-8 (finishing kit)
Ottawa, Canada
http://www.kilohotel.com/rv8
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