The Murphy Builders Site

I have been doing flight tests on my airplane, followed
by calibration tests on my instruments. I get the following
stall speeds flying with a gross weight of 1550 lbs.

Reflex (6 degrees up) 58 mph
Neutral 55 mph
Flaps (6 degrees down) 54 mph
Flaps (12 degrees down) 53 mph
Flaps (18 degrees down) 51 mph

These are a bit higher than advertised in the Rebel literature
and I was wondering if others had experienced anything like
this. I calibrated the ASI with a water manometer so it should
be pretty accurate. No leaks in the system and one steam gauge
and one GRT EFIS which read 1 mph apart - steam lower.

Murphy advertises
Stall (No Flap) Power Off (mph) 44
Stall (FULL FLAP) Power On (mph) 40

The second thing that I would like a comment or two on as to
how much of a decrease in stall speed that one actually
experienced with vortex generators. Significant??

The third thing I was wondering if anyone out there is flying
with a Lift Reserve Indicator. What is your actual experience.
If anyone would like to read about LRI's, the following
web sites may be of interest.

Flying with a Lift Reserve Indicator

http://home.hiwaay.net/~sbuc/journal/li ... ve-pg2.htm

Place to buy an economical kit.

http://sites.google.com/site/lrikit/

Thanking you in advance for your responses. PS I like to
fly slow and sight see.





-----------------------------------------------------------------
List archives located at: https://mail.dcsol.com/login
username "rebel" password "builder"
Unsubscribe: rebel-builders-unsubscribe@dcsol.com
List administrator: mike.davis@dcsol.com
-----------------------------------------------------------------

I hate to sound ignorant, but, "da" what is an LRI?

Also I have a pair of Murphy extened wing tips that I am considering
installing on my Rebel. I have heard that they will lower the stall speed
a fair amount. On the otherhand I can assume that they will also
lower the cruise speed as well? Can anyone confirm?

Thank you Keith P. "Taildraggers forever"


On 12/13/2010 2:22 PM, gargus@comcast.net wrote to rebel-builders:

->
->
-> I have been doing flight tests on my airplane, followed
-> by calibration tests on my instruments. I get the following
-> stall speeds flying with a gross weight of 1550 lbs.
->
-> Reflex (6 degrees up) 58 mph
-> Neutral 55 mph
-> Flaps (6 degrees down) 54 mph
-> Flaps (12 degrees down) 53 mph
-> Flaps (18 degrees down) 51 mph
->
-> These are a bit higher than advertised in the Rebel literature
-> and I was wondering if others had experienced anything like
-> this. I calibrated the ASI with a water manometer so it should
-> be pretty accurate. No leaks in the system and one steam gauge
-> and one GRT EFIS which read 1 mph apart - steam lower.
->
-> Murphy advertises
-> Stall (No Flap) Power Off (mph) 44
-> Stall (FULL FLAP) Power On (mph) 40
->
-> The second thing that I would like a comment or two on as to
-> how much of a decrease in stall speed that one actually
-> experienced with vortex generators. Significant??
->
-> The third thing I was wondering if anyone out there is flying
-> with a Lift Reserve Indicator. What is your actual experience.
-> If anyone would like to read about LRI's, the following
-> web sites may be of interest.
->
-> Flying with a Lift Reserve Indicator
->
-> http://home.hiwaay.net/~sbuc/journal/li ... ve-pg2.htm
->
-> Place to buy an economical kit.
->
-> http://sites.google.com/site/lrikit/
->
-> Thanking you in advance for your responses. PS I like to
-> fly slow and sight see.
->
->




-----------------------------------------------------------------
List archives located at: https://mail.dcsol.com/login
username "rebel" password "builder"
Unsubscribe: rebel-builders-unsubscribe@dcsol.com
List administrator: mike.davis@dcsol.com
-----------------------------------------------------------------

Three good websites about LRIs which should answer your question are:

Flying with a Lift Reserve Indicator

http://home.hiwaay.net/~sbuc/journal/li ... ve-pg2.htm

Installing a Lift Reserve Indicator

http://home.hiwaay.net/~sbuc/journal/liftreserve.htm

Buying an economical LRI kit.

http://sites.google.com/site/lrikit/

Increasing the wing span will lower both the stall speed and cruise
speed.

-----Original Message-----
From: mike.davis@dcsol.com [mailto:mike.davis@dcsol.com] On Behalf Of
kpierson@dcsol.com
Sent: Tuesday, December 14, 2010 4:36 PM
To: rebel-builders@dcsol.com
Subject: [rebel-builders] RE: Stall speeds

I hate to sound ignorant, but, "da" what is an LRI?

Also I have a pair of Murphy extened wing tips that I am considering
installing on my Rebel. I have heard that they will lower the stall speed
a fair amount. On the otherhand I can assume that they will also
lower the cruise speed as well? Can anyone confirm?

Thank you Keith P. "Taildraggers forever"






-----------------------------------------------------------------
List archives located at: https://mail.dcsol.com/login
username "rebel" password "builder"
Unsubscribe: rebel-builders-unsubscribe@dcsol.com
List administrator: mike.davis@dcsol.com
-----------------------------------------------------------------