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kbob(at)cox.net
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 Posted: Mon May 29, 2006 3:19 pm Post subject: 81" pitch on O-320 |
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I'll throw in my 2 cents, and some numbers, since I'm running a 6A with 81"
pitch.
Couple of specs: 9.2:1 CR, carb & Emag on a fresh O-320 rated 175HP (at)
2700RPM.
My performance is nearly identical to the 79" below on the O-320 160 HP,
except slightly higher speeds in cruise (~160kts or 195 MPH).
It runs about 2150 at WOT static runup, 2300 on takeoff, 2450-2500 at cruise
over 8000', 2600 in WOT 200-300 FPM descents.
In other words, it never exceeds the RPM limit except at lower altitude runs
(<8000') or diving.
Climb is 1000-1500 depending on wt. & density altitude. This is all done in
Phoenix where D.A. is about 3000'+ & solo I'm at 1500 FPM climb.
In return I get 7 GPH fuel burns, which is great economy, and even EGT's &
CHT's when WOT. I prefer WOT operation.
I would not change the prop unless I needed more climb rate, but have not
used a short runway where it is critical.
With this setup, a 3000' long runway is fine at 5000' DA & gross weight.
This combo returns about 750 FPM climb.
YMMV,
Kelly Patterson
N716K RV-6A PHX, AZ
61 hrs
| Quote: | Time: 08:06:11 PM PST US
From: "james frierson" <tn3639(at)hotmail.com>
Subject: RE: Cruise Prop O320
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
>
>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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lifeofreiley2003(at)yahoo
Guest
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| Posted: Mon May 29, 2006 4:15 pm Post subject: 81" pitch on O-320 |
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|
Kelly,
Thanks for the reply. I knew there had to be a few out there running this combo.
Darrell
do not archive
Kelly Patterson <kbob(at)cox.net> wrote:
I'll throw in my 2 cents, and some numbers, since I'm running a 6A with 81"
pitch.
Couple of specs: 9.2:1 CR, carb & Emag on a fresh O-320 rated 175HP (at)
2700RPM.
My performance is nearly identical to the 79" below on the O-320 160 HP,
except slightly higher speeds in cruise (~160kts or 195 MPH).
It runs about 2150 at WOT static runup, 2300 on takeoff, 2450-2500 at cruise
over 8000', 2600 in WOT 200-300 FPM descents.
In other words, it never exceeds the RPM limit except at lower altitude runs
(<8000') or diving.
Climb is 1000-1500 depending on wt. & density altitude. This is all done in
Phoenix where D.A. is about 3000'+ & solo I'm at 1500 FPM climb.
In return I get 7 GPH fuel burns, which is great economy, and even EGT's &
CHT's when WOT. I prefer WOT operation.
I would not change the prop unless I needed more climb rate, but have not
used a short runway where it is critical.
With this setup, a 3000' long runway is fine at 5000' DA & gross weight.
This combo returns about 750 FPM climb.
YMMV,
Kelly Patterson
N716K RV-6A PHX, AZ
61 hrs
| Quote: | Time: 08:06:11 PM PST US
From: "james frierson"
Subject: RE: Cruise Prop O320
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
>
>Anyone using a Sensenich 70CM()S9-0-81 Cruise Prop with an
O320/160 hp
>on an RV 7 0r RV 9?
>
>Darrell
|
"Do Not Archive"
Darrell Reiley
RV7A "Reiley Rocket"
N622DR Reserved
---------------------------------
Talk is cheap. Use Yahoo! Messenger to make PC-to-Phone calls. Great rates starting at 1¢/min.
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http://www.matronics.com/Navigator?RV-List |
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