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lifeofreiley2003(at)yahoo
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 Posted: Sat May 27, 2006 8:41 am Post subject: Cruise Prop O320 |
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Anyone using a Sensenich 70CM()S9-0-81 Cruise Prop with an O320/160 hp
on an RV 7 0r RV 9?
Darrell
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tn3639(at)hotmail.com
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| Posted: Sat May 27, 2006 7:06 pm Post subject: Cruise Prop O320 |
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Darrel,
I asked the same qeustion and awhile back and this was the response I got
from a guy that was running an 79" on a 160hp 6A.
"I recently upgraded my 150hp motor to 160hp and have about 30 hours
since the rebuild. I started out with the 150hp prop (77") as I was only
turning 2150 on take off and 2470 cruise. However, that went up to 2350
on take off and well over 2650 cruise (could not use full throttle as
the prop is limited to 2600 rpm). I now have about 10 hours on the 79"
prop. I was measuring some numbers the other day - I can pull about 2630
at 5500' giving about 150 kt indicated (around 170 kt true), although
that is 30 rpm over the limit. At 2470 I get 137 kt indicated (around
155 true). I am thinking about getting an extra inch of pitch added to
the prop, but might stay where I am.
On climb I'm getting over 1000 fpm at about 1000 ft on a hot Texas day
(low 90s) at about 1500lbs - my CHTs get hot quickly so I can't sustain
that for very long. On the runway I am now getting 2300 rpm, so am
loathe to increase the pitch more as at 2150 the climb rate was really
poor (sometimes less than 500 fpm). However I might go for an additional
inch of pitch (to 80"), I would have thought 81" would really be a
cruise prop and not yield very good climb performance. I think I am
ready to sacrifice a couple of knots of cruise speed for better climb."
I resently put the 80" on my 160HP 6A and this is the results I am
experiencing as noted in an earlier posting..
"I recently put a new 80 pitch Sensenich propeller on my 160HP RV6A. I made
a cross country trip and here are my initial results. At 8500 at
approximately 60 degrees F, I was indicating 158 mph, 2530 rpms at WOT and
1680 lbs. After doing the math that wound up being 185 mph TAS and the
ground speed according to my GPS was 195 mph which would be about right as
there should have been a slight 5-8 knot tail wind component according to
Dans web sites wind calculator. After climbing to 9500 the results were
still 158 mph indicated, 58deg F, 2500 rpm at WOT which works out to 188 mph
TAS, 197 mph GPS ground speed. Again with the expected tail winds this was
right on. This is the first time I have been able to fly at WOT and the CHTs
and the EGTs were much more uniform.
All in all the new prop is doing exactly as advertised. Note: These are not
super picky test pilot figures, just what was noted during a flight from a
fly-in with my lovely bride taking notes"
Hope this helps
Scott
RV6A
160hp
| Quote: | From: Darrell Reiley <lifeofreiley2003(at)yahoo.com>
Reply-To: rv-list(at)matronics.com
To: RV-List <rv-list(at)matronics.com>
Subject: Cruise Prop O320
Date: Sat, 27 May 2006 09:35:48 -0700 (PDT)
Anyone using a Sensenich 70CM()S9-0-81 Cruise Prop with an O320/160 hp
on an RV 7 0r RV 9?
Darrell
---------------------------------
Yahoo! Messenger with Voice. PC-to-Phone calls for ridiculously low rates.
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| | - The Matronics RV-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RV-List |
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