Rebel Cruise speed

[Wayne G. O'Shea]

Bruce as for part two of you message!!

I was out today on my 20" x 70" wheel skis and at 2450 I only get about 95
mph, with my 150 HP and WD prop. Mind you I <CAN> take off in less than 450
feet, out of 2' deep powder snow, with 26 gallons and myself aboard (or an
all up weight of about 1420lbs, including my two sets of snowshoes in the
back). I know categorically that a Super Cub can't do that on 10" wide
straight Federal skis (with plastic bottoms) as I had two of them in the
yard Monday afternoon. The 125HP SC used approx 1050 feet to get off and the
150HP used 800 feet when they left, and the150hp even cheated and used his
"back tracks" for half the take off run!!

Even on wheels in the summer I only see a maximum of about 100Knots wound up
at 2550/2600, but usually about 90Knots on the GPS on a calm day at
2450/2500. Sure I could pitch my prop a bit coarser, but I am in no hurry to
go anywhere (except maybe when a thunderstorm is chasing me!). Bob P's XWI
cruised pretty close to 104Knots with the power up at about 2550, if I
remember correctly, without any gear fairings and it's 150 HP x E2D and
Sensenich 74 x 56. Maybe Bob can give us the true number for XWI that he is
getting these days. Anyone that is getting much more than what you and I are
seeing must be running a really coarse propellor, or be like Steven that has
spent, many, many hours fairing everything right down to his filler necks.

I have wheel pants for mine and don't think they give me 10 MPH, maybe 5 at
the most but I have never really bothered to compare when they are on or
off. My gear legs are faired but I did make the cardinal sin of leaving the
rear tube round, unlike the way I fair them all now with a proper trailing
edge. SOME day when I find some spare time I am going to clean up the rear
drag brace tube and also add a trailing edge to my gear struts to make them
streamline and see how much I gain. The only thing that worries me about
taking out the drag is losing the ability to slide down the back side of
trees to land very very short. Make it tooo "slippy" and I won't be able to
land in the back field behind my mothers house anymore.

Cheers,
Wayne

----- Original Message -----
From: <Legeorgen@aol.com>
To: <murphy-rebel@dcsol.com>
Sent: Tuesday, January 28, 2003 11:55 PM
Subject: Re: Proseal

Wayne,

Just how yellow is the "old" Randolph slosh? The slosh in my tank was

white

in color but I believe was added to the wing in 95, so I assumed it was

the

old stuff. I thought the newer auto grade Randolph was introduced in 96 or
97. After testing pieces of the slosh coated aluminum it in a jar of auto

gas

I felt confident enough to start mixing auto fuel with 100LL. just very
recently.

On another subject. I have heard several builders claim 120 MPH cruise

speeds

at 75% (like MAM advertises) with the 0320 Lycoming and a 74x56 Sensenich
metal prop. My cruise at this power setting is 110 MPH. I have the spring
gear not faired, no wheel pants (don't want them) and a speed cowl. I find

it

hard to believe, from my own experience, that I can pick up 10 MPH with

wheel

pant spring gear faring and a few other possible drag reducers. Any

comments?

Bruce 357R

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[Rick Harper]

G'day Guys !

Forgot to mention ... I have made Balsa Leading edge shapes and
Trailing edge shapes and stuck them with clear silicon to my
undercarriage braces and stabiliser struts too ..... they've done 200
hrs so far and not even one stone chip ! ...

I used to have a shrouded tailwheel ... but since I've replaced the
tailwheel with a SCOTT 3400 (thanks Dave !), and now have NO shroud,
the plane is definitely travelling a bit slower .....I think I have to
make a new shroud / wheel pant for the tailwheel soon & get some more
cruise speed back !

The Rebel definitely seems to "hit a brick wall" at around 100 knots
.... but I was advised by my aircraft designer mate, that anything I
could do to reduce drag would give much more result than upping the HP
rating of the engine.... and he's obviously right !

Oh, and I also made flush mounting fuel caps ... to reduce drag also ...

It must work, as I can cruise at anything from 95 to 105 knots at cruise
settings on 18 to 20 ltrs an hour !

Rick & Wendy Harper
541R
----- Original Message -----
From: Wayne G. O'Shea
To: murphy-rebel@dcsol.com
Sent: Thursday, January 30, 2003 9:47 AM
Subject: Rebel Cruise speed


Bruce as for part two of you message!!

I was out today on my 20" x 70" wheel skis and at 2450 I only get
about 95
mph, with my 150 HP and WD prop. Mind you I <CAN> take off in less
than 450
feet, out of 2' deep powder snow, with 26 gallons and myself aboard
(or an
all up weight of about 1420lbs, including my two sets of snowshoes in
the
back). I know categorically that a Super Cub can't do that on 10" wide
straight Federal skis (with plastic bottoms) as I had two of them in
the
yard Monday afternoon. The 125HP SC used approx 1050 feet to get off
and the
150HP used 800 feet when they left, and the150hp even cheated and used
his
"back tracks" for half the take off run!!

Even on wheels in the summer I only see a maximum of about 100Knots
wound up
at 2550/2600, but usually about 90Knots on the GPS on a calm day at
2450/2500. Sure I could pitch my prop a bit coarser, but I am in no
hurry to
go anywhere (except maybe when a thunderstorm is chasing me!). Bob P's
XWI
cruised pretty close to 104Knots with the power up at about 2550, if I
remember correctly, without any gear fairings and it's 150 HP x E2D
and
Sensenich 74 x 56. Maybe Bob can give us the true number for XWI that
he is
getting these days. Anyone that is getting much more than what you and
I are
seeing must be running a really coarse propellor, or be like Steven
that has
spent, many, many hours fairing everything right down to his filler
necks.

I have wheel pants for mine and don't think they give me 10 MPH, maybe
5 at
the most but I have never really bothered to compare when they are on
or
off. My gear legs are faired but I did make the cardinal sin of
leaving the
rear tube round, unlike the way I fair them all now with a proper
trailing
edge. SOME day when I find some spare time I am going to clean up the
rear
drag brace tube and also add a trailing edge to my gear struts to make
them
streamline and see how much I gain. The only thing that worries me
about
taking out the drag is losing the ability to slide down the back side
of
trees to land very very short. Make it tooo "slippy" and I won't be
able to
land in the back field behind my mothers house anymore.

Cheers,
Wayne

----- Original Message -----
From: <Legeorgen@aol.com>
To: <murphy-rebel@dcsol.com>
Sent: Tuesday, January 28, 2003 11:55 PM
Subject: Re: Proseal

Wayne,

Just how yellow is the "old" Randolph slosh? The slosh in my tank

was
white

in color but I believe was added to the wing in 95, so I assumed it

was
the

old stuff. I thought the newer auto grade Randolph was introduced in

96 or

97. After testing pieces of the slosh coated aluminum it in a jar of

auto
gas

I felt confident enough to start mixing auto fuel with 100LL. just

very

recently.

On another subject. I have heard several builders claim 120 MPH

cruise
speeds

at 75% (like MAM advertises) with the 0320 Lycoming and a 74x56

Sensenich

metal prop. My cruise at this power setting is 110 MPH. I have the

spring

gear not faired, no wheel pants (don't want them) and a speed cowl.

I find
it

hard to believe, from my own experience, that I can pick up 10 MPH

with
wheel

pant spring gear faring and a few other possible drag reducers. Any

comments?

Bruce 357R

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[Walter Klatt]

I don't know what makes some planes go faster (or
slower), but I had quite a surprise a couple of weeks
ago, when I went flying with another local Rebel for
some aerial photos. Mine is on amphibs and is 150 HP,
and his is on wheels and 160 HP. What we found out, is
that he couldn't keep up to me, and wasn't even close
on top speed. Both of us had 2 people on board and
about the same fuel. He is running a McCauley 75 or 76
inch diameter prop, which seemed to be well matched, as
it got close to redline flat out in straight and level.
Anyway, it was hard to believe, so we figured it must
be his prop. Or maybe his engine just isn't putting out
the power. It may be that my reflex works better than
his as well.

Mine does 105 mph at 2350 and 125 mph flat out. Again,
this is on 1800 amphibs and 150 hp 0320.

Walter

-----Original Message-----
From: mike.davis@dcsol.com
[mailto:mike.davis@dcsol.com]On Behalf Of
Wayne G. O'Shea
Sent: Wednesday, January 29, 2003 2:47 PM
To: murphy-rebel@dcsol.com
Subject: Rebel Cruise speed


Bruce as for part two of you message!!

I was out today on my 20" x 70" wheel skis
and at 2450 I only get about 95
mph, with my 150 HP and WD prop. Mind you I
<CAN> take off in less than 450
feet, out of 2' deep powder snow, with 26
gallons and myself aboard (or an
all up weight of about 1420lbs, including my
two sets of snowshoes in the
back). I know categorically that a Super Cub
can't do that on 10" wide
straight Federal skis (with plastic bottoms)
as I had two of them in the
yard Monday afternoon. The 125HP SC used
approx 1050 feet to get off and the
150HP used 800 feet when they left, and
the150hp even cheated and used his
"back tracks" for half the take off run!!

Even on wheels in the summer I only see a
maximum of about 100Knots wound up
at 2550/2600, but usually about 90Knots on
the GPS on a calm day at
2450/2500. Sure I could pitch my prop a bit
coarser, but I am in no hurry to
go anywhere (except maybe when a
thunderstorm is chasing me!). Bob P's XWI
cruised pretty close to 104Knots with the
power up at about 2550, if I
remember correctly, without any gear
fairings and it's 150 HP x E2D and
Sensenich 74 x 56. Maybe Bob can give us the
true number for XWI that he is
getting these days. Anyone that is getting
much more than what you and I are
seeing must be running a really coarse
propellor, or be like Steven that has
spent, many, many hours fairing everything
right down to his filler necks.

I have wheel pants for mine and don't think
they give me 10 MPH, maybe 5 at
the most but I have never really bothered to
compare when they are on or
off. My gear legs are faired but I did make
the cardinal sin of leaving the
rear tube round, unlike the way I fair them
all now with a proper trailing
edge. SOME day when I find some spare time I
am going to clean up the rear
drag brace tube and also add a trailing edge
to my gear struts to make them
streamline and see how much I gain. The only
thing that worries me about
taking out the drag is losing the ability to
slide down the back side of
trees to land very very short. Make it tooo
"slippy" and I won't be able to
land in the back field behind my mothers
house anymore.

Cheers,
Wayne

----- Original Message -----
From: <Legeorgen@aol.com>
To: <murphy-rebel@dcsol.com>
Sent: Tuesday, January 28, 2003 11:55 PM
Subject: Re: Proseal

Wayne,

Just how yellow is the "old" Randolph

slosh? The slosh in my tank was
white

in color but I believe was added to the

wing in 95, so I assumed it was
the

old stuff. I thought the newer auto grade

Randolph was introduced in 96 or

97. After testing pieces of the slosh

coated aluminum it in a jar of auto
gas

I felt confident enough to start mixing

auto fuel with 100LL. just very

recently.

On another subject. I have heard several

builders claim 120 MPH cruise
speeds

at 75% (like MAM advertises) with the 0320

Lycoming and a 74x56 Sensenich

metal prop. My cruise at this power

setting is 110 MPH. I have the spring

gear not faired, no wheel pants (don't

want them) and a speed cowl. I find
it

hard to believe, from my own experience,

that I can pick up 10 MPH with
wheel

pant spring gear faring and a few other

possible drag reducers. Any
comments?

Bruce 357R

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[Bob Patterson]

Hi Wayne !

All last summer, I was getting 118 mph cruise with XWI,
at 2,450 rpm, with no fairings on the gear legs. I know from past
experience that a good job of fairing the gear will add up to 10 mph,
so I'd better do that !!

I had the Murphy WIDE wheel pants on FINR, over the fat
Dico tires - they added absolutely ZIP to the speed, but they
did keep mud off the wings ! Murphy also sell a NARROW LONG
wheel pant, to go over the NARROW 600 tires - these added about
5 mph to FPES ....

The thing I disliked most about both of those wheel pants
is - you can't stand on them !! This makes refueling and checking
the fuel caps a real pain, because you need a ladder or stool.

I believe that Brian Cross was cruising at over 125 mph with
his Warp Drive prop, and was very disappointed with the speed reduction
when he went to the 58" Sensenich. So much so that he had it repitched
coarser (62" ???) !! Please jump in here Brian .....
Not having to worry about losing a blade while cruising probably
eased the pain considerably ! ;-)

I don't think big speed differences are all that unusual -
I've flown different Citabrias (as they came from the factory),
that cruised 10 mph different !! The one that cruised well didn't
climb nearly as well as the other one - both had identical engines
and props ! Maybe it's the rigging ..... not that there's much
to change on a Rebel. Certainly, any effort at streamlining and
fairing will make a difference, as Steve's performance clearly
shows !

.....bobp

------------------------------------orig.---------------------------------
At 05:47 PM 1/29/03 -0500, you wrote:

Bruce as for part two of you message!!

I was out today on my 20" x 70" wheel skis and at 2450 I only get about 95
mph, with my 150 HP and WD prop. Mind you I <CAN> take off in less than 450
feet, out of 2' deep powder snow, with 26 gallons and myself aboard (or an
all up weight of about 1420lbs, including my two sets of snowshoes in the
back). I know categorically that a Super Cub can't do that on 10" wide
straight Federal skis (with plastic bottoms) as I had two of them in the
yard Monday afternoon. The 125HP SC used approx 1050 feet to get off and the
150HP used 800 feet when they left, and the150hp even cheated and used his
"back tracks" for half the take off run!!

Even on wheels in the summer I only see a maximum of about 100Knots wound up
at 2550/2600, but usually about 90Knots on the GPS on a calm day at
2450/2500. Sure I could pitch my prop a bit coarser, but I am in no hurry to
go anywhere (except maybe when a thunderstorm is chasing me!). Bob P's XWI
cruised pretty close to 104Knots with the power up at about 2550, if I
remember correctly, without any gear fairings and it's 150 HP x E2D and
Sensenich 74 x 56. Maybe Bob can give us the true number for XWI that he is
getting these days. Anyone that is getting much more than what you and I are
seeing must be running a really coarse propellor, or be like Steven that has
spent, many, many hours fairing everything right down to his filler necks.

I have wheel pants for mine and don't think they give me 10 MPH, maybe 5 at
the most but I have never really bothered to compare when they are on or
off. My gear legs are faired but I did make the cardinal sin of leaving the
rear tube round, unlike the way I fair them all now with a proper trailing
edge. SOME day when I find some spare time I am going to clean up the rear
drag brace tube and also add a trailing edge to my gear struts to make them
streamline and see how much I gain. The only thing that worries me about
taking out the drag is losing the ability to slide down the back side of
trees to land very very short. Make it tooo "slippy" and I won't be able to
land in the back field behind my mothers house anymore.

Cheers,
Wayne

----- Original Message -----
From: <Legeorgen@aol.com>
To: <murphy-rebel@dcsol.com>
Sent: Tuesday, January 28, 2003 11:55 PM
Subject: Re: Proseal

Wayne,

Just how yellow is the "old" Randolph slosh? The slosh in my tank was

white

in color but I believe was added to the wing in 95, so I assumed it was

the

old stuff. I thought the newer auto grade Randolph was introduced in 96 or
97. After testing pieces of the slosh coated aluminum it in a jar of auto

gas

I felt confident enough to start mixing auto fuel with 100LL. just very
recently.

On another subject. I have heard several builders claim 120 MPH cruise

speeds

at 75% (like MAM advertises) with the 0320 Lycoming and a 74x56 Sensenich
metal prop. My cruise at this power setting is 110 MPH. I have the spring
gear not faired, no wheel pants (don't want them) and a speed cowl. I find

it

hard to believe, from my own experience, that I can pick up 10 MPH with

wheel

pant spring gear faring and a few other possible drag reducers. Any

comments?

Bruce 357R

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[Legeorgen]

Wayne,

Your numbers sound more consistent with what I'm seeing on my 0320 E2D metal
Sensenich 74x56. I'm not complaining mind you. It's just after hearing others
claim more speed I began to feel like I was the lone dog trailing the rest of
the crowd. I do want to keep up with Bobp and company this summer when they
venture to the West coast and Arlington.

The Kitfox slips better than my Rebel (more rudder), but it needs to, because
it will float 10" off the runway for 500 feet before settling down. And if
your just 5 MPH to fast on your approach, well, you better have a good set of
brakes or a 1500 foot runway in front of you. The Rebel is much easier to
land on target because of its predictable high sink rate at 55 MPH approach.
The Fox would not have enough elevator to arrest that rate of decent and
flare properly. It's doable but requires much more attention to land than the
Rebel. The Rebel is much simpler and a more stable platform IMHO.

Bobp, I am interested in your numbers if you don't mind spelling them out.

Bruce 357R





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[Legeorgen]

Walter, have you checked your ground speed with a GPS?

Bruce 357R




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[Walter Klatt]

Yes, I fly with a GPS all the time. However, it was
some time ago that I checked my ASI speeds using the 4
direction average, but I do remember it was pretty
close. There were always some variances with altitude
and temperature, and I never did the scientific
accuracy check with known temperature, air pressure and
altitude.

I just recently installed an OAT gauge, and my GPS has
an E6B feature, so I may do that again one of the days,
and try to get an accurate calibration. So, at this
time, I will not proclaim 100 % accuracy of my ASI.

The guy in the other Rebel that I was flying with
always thought his ASI was reading low, until he flew
with me, and found that both of our ASI's had the same
readings in flight.

Bruce, you mentioned that you did 110 mph at 75%. What
RPM was that? Also, what do you get flat out straight
and level in RPM and speed? I assume you use reflex.
And what is your static RPM?

Walter

-----Original Message-----
From: mike.davis@dcsol.com
[mailto:mike.davis@dcsol.com]On Behalf Of
legeorgen@aol.com
Sent: Wednesday, January 29, 2003 9:20 PM
To: murphy-rebel@dcsol.com
Subject: Re: Rebel Cruise speed


Walter, have you checked your ground speed
with a GPS?

Bruce 357R



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[Legeorgen]

Hi Walter,

RPM at 75% power depends on my altitude. I was at 3500 feet MSL, without
looking at my chart, I believe was around 2550 RPM. I get a litter faster at
7500 feet MSL and 2450 RPM, which is also 75% power. The air is thinner at
7500 feet.

I do have reflex at 6 and 12 degrees but I believe it only really get 6 in
the 12 degree position because of give in the cable. My static is 2430 RPM.
Believe it or not, I have not tested my flat out cruise at full power but I
will do that next flight and report back. I believe it will be close to
redline.

Bruce 357R





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[Walter Klatt]

Are you sure it wasn't the other way around? I did some
high altitude cruising (9500 feet) last summer to get
over some mountains, and found that I had to run at
higher RPM's to keep the airspeed up. I have a fuel
monitor too, and remember that I had to increase
throttle and RPM to keep the fuel flow up. I didn't
check it, but am sure my true airspeed must have been
higher than my indicated. Now that I have my OAT, I
will have to try my GPS E6B next time I'm up there.

Will be interested to hear about your flat out speed
and RPM.

Walter

-----Original Message-----
From: mike.davis@dcsol.com
[mailto:mike.davis@dcsol.com]On Behalf Of
Legeorgen@aol.com
Sent: Thursday, January 30, 2003 6:55 PM
To: murphy-rebel@dcsol.com
Subject: Re: Rebel Cruise speed


Hi Walter,

RPM at 75% power depends on my altitude. I
was at 3500 feet MSL, without
looking at my chart, I believe was around
2550 RPM. I get a litter faster at
7500 feet MSL and 2450 RPM, which is also
75% power. The air is thinner at
7500 feet.

I do have reflex at 6 and 12 degrees but I
believe it only really get 6 in
the 12 degree position because of give in
the cable. My static is 2430 RPM.
Believe it or not, I have not tested my flat
out cruise at full power but I
will do that next flight and report back. I
believe it will be close to
redline.

Bruce 357R




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[Legeorgen]

Walter,

Yes, you are correct in that I had the RPM's and altitude backwards (call it
Brain fart, or something). At 7500 feet MSL all normally aspirated engines
will only produce 75% power, or something close to it, at full throttle and
2700 RPM. 75% power at sea level is 2450 RPM for my 0320 E2D 150 HP Lycoming.

Today at 4000 feet MSL and 35 degrees F I was able to get 115 MPH in cruise
before I hit 2700 RPM. This was checked with a GPS. I have to throttle back a
little to prevent exceeding maximum RPM. I have a 74X56 metal Sensenich that
I believe MAM advertises, for the Rebel anyway, at a 120 MPH cruise at 75%
(with this prop). MAM calls this a climb prop. And it is! But I don't come
near MAM's claimed top end cruise number. I can get about 100 or maybe 105
MPH at 75%. It will, however, climb at 1000 or 1500 FPM depending on Gross
weight.

I'm not surprised at these numbers or disappointed, Really, because most kit
manufacturers exaggerate their performance numbers. It's sort of a given. I
just find it difficult to believe some of the numbers a few other pilots
claim are really accurate. I think they either fudge a little or are reading
IAS and not checking it properly with a GPS.

Cheers,

Bruce 367R




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[Walter Klatt]

Hmmm, this sure doesn't sound right if you are only
getting 115 mph at full throttle straight and level.
Are you sure your GPS wasn't giving you knots?

This sounds a little like the other Rebel I mentioned
earlier that went flying with me. For some reason, his
didn't have any speed either. I figure it has to be his
prop, though. There is no way that a wheels Rebel
should be slower than one on amphib floats.

Having said that, I have not ruled out ASI error in
mine, and will check it again when I get a chance. We
had low clouds all weekend here, so didn't bother to go
up.

I do know airspeeds can get confusing when you are
dealing with IAS, CAS and TAS. I know some
manufacturers give their cruise and top speeds in TAS
at an optimum altitude for their airframe and engine,
which of course will always be much higher at altitude
than IAS. The only time TAS and IAS are the same is at
sea level and standard temperature and pressure. Of
course your IAS and CAS must be the same as well then.

Anyway, now that I have an OAT, I will look for a
chance to do some airspeed checking with my GPS and its
E6B feature. I will write down all the numbers, and
then see if I can figure out my CAS's and TAS's for a
few different IAS's and altitudes.

Your climb sounds about right, though. Right now, mine
will climb at 1100 fpm at 1681 pounds, but I have a
finer pitch prop (74 X 54), so that makes sense. I
assume when you said 1000 fpm you were at 1650.

Walter

-----Original Message-----
From: mike.davis@dcsol.com
[mailto:mike.davis@dcsol.com]On Behalf Of
legeorgen@aol.com
Sent: Sunday, February 02, 2003 6:26 PM
To: murphy-rebel@dcsol.com
Subject: Re: Rebel Cruise speed


Walter,

Yes, you are correct in that I had the RPM's
and altitude backwards (call it
Brain fart, or something). At 7500 feet MSL
all normally aspirated engines
will only produce 75% power, or something
close to it, at full throttle and
2700 RPM. 75% power at sea level is 2450 RPM
for my 0320 E2D 150 HP Lycoming.

Today at 4000 feet MSL and 35 degrees F I
was able to get 115 MPH in cruise
before I hit 2700 RPM. This was checked with
a GPS. I have to throttle back a
little to prevent exceeding maximum RPM. I
have a 74X56 metal Sensenich that
I believe MAM advertises, for the Rebel
anyway, at a 120 MPH cruise at 75%
(with this prop). MAM calls this a climb
prop. And it is! But I don't come
near MAM's claimed top end cruise number. I
can get about 100 or maybe 105
MPH at 75%. It will, however, climb at 1000
or 1500 FPM depending on Gross
weight.

I'm not surprised at these numbers or
disappointed, Really, because most kit
manufacturers exaggerate their performance
numbers. It's sort of a given. I
just find it difficult to believe some of
the numbers a few other pilots
claim are really accurate. I think they
either fudge a little or are reading
IAS and not checking it properly with a GPS.

Cheers,

Bruce 367R



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[yeom]

Hi Bruce,
Thought my figures may be of interest, 0-320 150hp with 74-56
sensenich at 2450 rpm a GPS reading of 103 Kts with the 8.50 tyres and 105
kts with the 8.00's this is at lower levels. I can flight plan on this

Cheers

Alister

----- Original Message -----
From: <Legeorgen@aol.com>
To: <murphy-rebel@dcsol.com>
Sent: Monday, February 03, 2003 3:25 PM
Subject: Re: Rebel Cruise speed

Walter,

Yes, you are correct in that I had the RPM's and altitude backwards (call

it

Brain fart, or something). At 7500 feet MSL all normally aspirated engines
will only produce 75% power, or something close to it, at full throttle

and

2700 RPM. 75% power at sea level is 2450 RPM for my 0320 E2D 150 HP

Lycoming.

Today at 4000 feet MSL and 35 degrees F I was able to get 115 MPH in

cruise

before I hit 2700 RPM. This was checked with a GPS. I have to throttle

back a

little to prevent exceeding maximum RPM. I have a 74X56 metal Sensenich

that

I believe MAM advertises, for the Rebel anyway, at a 120 MPH cruise at 75%
(with this prop). MAM calls this a climb prop. And it is! But I don't come
near MAM's claimed top end cruise number. I can get about 100 or maybe 105
MPH at 75%. It will, however, climb at 1000 or 1500 FPM depending on Gross
weight.

I'm not surprised at these numbers or disappointed, Really, because most

kit

manufacturers exaggerate their performance numbers. It's sort of a given.

I

just find it difficult to believe some of the numbers a few other pilots
claim are really accurate. I think they either fudge a little or are

reading

IAS and not checking it properly with a GPS.

Cheers,

Bruce 367R

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[Legeorgen]

Hi Walter/Alister,

I don't concern myself with TAS and CAS to much. It's to much work for what
it's worth. The differences are negligible for flight planning, for me
anyway, unless you're cutting your full reserves so low and you like living
that close to the edge. The last time I used and EB6 computer I was schooling
for an instrument rating. I forgot what it even looks like.

My IAS reads 115 MPH But my GPS always says 100 MPH. I have always assumed my
IAS was off but there is a possibility my GPS has switched to read Knots and
I've been fooling myself for 35 hours. The IAS and GPS read the same at 80
MPH. The spread begins at higher speeds and gets worse. I've been busy with
the FAA Circular 89-90 test regiment and am just now getting around to paying
more attention to my Air speeds and RPM's. I'll take a closer look at the GPS
on Saturday.

Thanks, Alister, for the performance numbers. I don't have a conversion
formula in handy but I do remember a 100 knots is close to 115 MPH, so that
would make sense.

Bruce 357R



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[Walter Klatt]

Hey, that's great, Bruce. At least now you will feel
better about your airplane knowing that it really is
faster than your Kitfox after all.

Walter

-----Original Message-----
From: mike.davis@dcsol.com
[mailto:mike.davis@dcsol.com]On Behalf Of
Legeorgen@aol.com
Sent: Thursday, February 06, 2003 6:47 PM
To: murphy-rebel@dcsol.com
Subject: Re: Rebel Cruise speed


Hi Walter, Alister and all,

I must confess and I do feel like and idiot.
I have been flying around with
my GPS on knots for 35 hours thinking I was
reading MPH and that my ASI was
simply off. I am happy to report that my
airspeeds are very close to what you
all have been saying, Walter, and I
apologies for doubting you all.

Today at 3500 MSL and 2575 RPM (75%power) I
was reading 125 MPH on my ASI and
GPS. Yippee!

Bruce 357R



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[Legeorgen]

Hi Walter, Alister and all,

I must confess and I do feel like and idiot. I have been flying around with
my GPS on knots for 35 hours thinking I was reading MPH and that my ASI was
simply off. I am happy to report that my airspeeds are very close to what you
all have been saying, Walter, and I apologies for doubting you all.

Today at 3500 MSL and 2575 RPM (75%power) I was reading 125 MPH on my ASI and
GPS. Yippee!

Bruce 357R



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