Today's Message Index:
----------------------
1. 04:32 AM - Re: 68/74 Sterba Propeller for Lycoming Powered Ta (Malcolm.Lovelace@coopertools.com)
2. 06:50 AM - Re: rigging (Mike Mears)
3. 07:51 AM - Re: rocker arm (DaveM)
4. 08:25 AM - Re: rocker arm (Eric Schlanser)
5. 06:43 PM - Re: 68/72 Sterba Propeller Perf Numbers (IslPilot@aol.com)
6. 06:57 PM - Re: 68/72 Sterba Propeller Perf Numbers (Jim Clement)
Message 1
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ilwind
| Subject: | 68/74 Sterba Propeller for Lycoming Powered Ta |
ilwind
--> Tailwind-List message posted by: Malcolm.Lovelace@CooperTools.com
Paul,
I have a Sterba 68/74 on my TW and depending on the OAT I get 2500 RPM
static and 207MPH @ 3000 RPM @ 40 degrees. I get 2350-2400 RPM static and
202MPH @ 2800 RPM @ 80 degrees. I think 68/76 would better but I have a
short grass strip and when the plane it loaded the extra RPM is great for
take off. I think on the next prop for the TW I am build now I will get a
68/78 and thin the blade to get the RPM that works best.
Malcolm
> -----Original Message-----
> From: IslPilot@aol.com [SMTP:IslPilot@aol.com]
> Sent: Wednesday, April 20, 2005 9:50 PM
> To: tailwind-list@matronics.com
> Subject: Re: Tailwind-List: 68/74 Sterba Propeller for Lycoming
> Powered Tailwind
>
> Jim & Weav & Stanton probably have the most experience with the trade
> offs. Ed Sterba told me that in years past, his customers were not
> concerned with running way over red line and that now a days he is seeing
> more requests to bring the cruise rpm down. He said that he did not think
> I would see any difference in top speed, just the rpm that it required to
> make the same speed.
>
> This most recent prop of his doesnt seem to bare that out, even letting it
> wind up over 3000 rpm I am not seeing the speed that I have with the old
> prop. About 10 mph less.
>
> I am curious if Brian Alley has a Catto now on his plane and his
> experience.........Brian???
>
> An article on my experiences would probably be humorous in "what not to
> do"
>
> Paul
> CVX
>
>
Message 2
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When you've got it perfectly rigged, and you're happy with it you might
like to do as we did and drill a tiny 1mm hole through both the main
flap tube extension and the actuating horn where it clamps around it.
That way, if you take the flap off for any reason, all you have to do to
get it back into alignment, is to position the butt end of a 1mm drill
through both holes, and it must be in the same relative position as when
you first drilled it. We had a sticky aileron bearing a while back, and
we used this method to get back in trim after stripping and reassembling
it. Worked a treat.
Mike M.
-----Original Message-----
From: owner-tailwind-list-server@matronics.com
[mailto:owner-tailwind-list-server@matronics.com] On Behalf Of
IslPilot@aol.com
Sent: 19 April 2005 19:48
To: tailwind-list@matronics.com
Subject: Re: Tailwind-List: rigging
=09
=09
Experts: How are you ideally setting your flaps in relation
to the wing airfoil for initial rig? Results of your experimentation
of various neutral positions?
Paul....... CVX
I am no expert, but I have mine set neutral or in line with the
wing tip. ....... Malcolm.Lovelace@coopertools.com
Paul, I agree with expert Malcolm, my old TW with flaps set
straight stalled like a C-150. I flew a Mustang II out of rig and one
other TW that would roll and dive for the ground in a heartbeat and
leave you with a helpless feeling for a while. The passenger in the TW
actually grabbed my leg as we dived toward the ground. Please do all you
experimenting aove 3000msl and let us know the results. PS; keep it
below 220mph, we like you and I am already a wanted man on your wife's
refrigerator.. Dennis in Chicago
neutral for me! Bob Danner
=09
Gotta answer this one Paul as I've seen a lot of Tailwinds not
quite optimized. I found a lot of guys keeping the trailing edge too
low. By raising it up so that the bottom of the airfoil on the wing
blends smoothly into the Trailing Edge, you get a faster airplane and an
airplane that doesn't require as much "Up" trim. This all reduces drag
and contributes to the speed and climb of the airplane.
I'm not really sure what Dennis was trying to say...............
What with being a wanted man in someone elses refrigerator.. What was
that all about? :) Weav
Paul, hold a straight edge on the bottom of the root rib
extending to the tip of the flap. Adjust flap so it rests on the
straight edge. You might have to adjust flaps so there is differential
between them to correct wing heaviness. Jim C.
=09
Sorry Fred, i should have explained that after i gave Paul a
TW ride and he was hooked, he said his wife put a wanted photo of me on
the fridge since all his spare time is working on Tailwinds. This is
from a wife that is a pilot and flies a Cub and works for Southwest!
.... Dennis in Chicago
hAHAHAHAHAHA It all makes sense now... Man, I could not
figure it out to save my life... Weav
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Message 3
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Eric:
See attached. The one picture is taken from the bottom of the fuselage (before
covering) and shows the vernier screw connected to the rod that has the springs
(like the plans), and is connected to the reversing arm for the elevator under
the baggage area. (Hope this makes sense). The other picture shows the
knob (yellow) under the seat. There is a pointer also on the vernier that can
be seen between the seats, which shows the position of the trim. I like this
arrangement, but my springs are not quite stiff enough all the time. About once
every year I have removed them, stretched them out, and reinstalled to get
the full trim range I like. Over time the springs compress and get weaker trim
control.
Dave
----- Original Message -----
From: Eric Schlanser
To: tailwind-list@matronics.com
Sent: Tuesday, April 19, 2005 2:29 PM
Subject: Re: Tailwind-List: rocker arm
Dave, Do you have a picture of the vernier screw? Thanks, Eric
the control rod is connected to a vernier screw below the pilot's seat.
Dave
N202Q
N168A
Message 4
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s=s1024; d=yahoo.com;
b=EmHeReGV/8hKLYU0W33egOL8wCqftxvS0npgg0Z6K1FAuwL4au5dIbGZhihVRvbNkgg5wOdJyHWoXl1toeEfzge8FJi8Z3BlOIGAhnbaHWXX6eSuUL4Awoe9RjyLVKiTAoIxdAbCAjmFrPJ97fl0t0G2d1bxQ+IUWfBPVmnXgmQ=
;
Dave, Clever arrangement. Thanks. Eric
do not archive
DaveM <dmagaw@att.net> wrote:
Eric:
See attached. The one picture is taken from the bottom of the fuselage (before
covering) and shows the vernier screw connected to the rod that has the springs
(like the plans), and is connected to the reversing arm for the elevator under
the baggage area. (Hope this makes sense). The other picture shows the
knob (yellow) under the seat. There is a pointer also on the vernier that can
be seen between the seats, which shows the position of the trim. I like this
arrangement, but my springs are not quite stiff enough all the time. About once
every year I have removed them, stretched them out, and reinstalled to get
the full trim range I like. Over time the springs compress and get weaker trim
control.
Dave
----- Original Message -----
From: Eric Schlanser
Subject: Re: Tailwind-List: rocker arm
Dave, Do you have a picture of the vernier screw? Thanks, Eric
the control rod is connected to a vernier screw below the pilot's seat.
Dave
N202Q
N168A
---------------------------------
Message 5
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| Subject: | Re: 68/72 Sterba Propeller Perf Numbers |
Went out with my pad and paper today and took a friend down to Port Huron on
the other side of the state. I wrote the numbers down for the old shaky 68/72
Sterba: The new 68/74 that I sent back for rework would wind up 150+ rpm
over these figures but is very smooth.
Static: 2420
Temp: +10C
Altitude 2500'
Max RPM 2810
Manifold Pressure: 28"
Indicating: 190 mph
18 gals and 280 lbs in the plane.
Paul
CVX
Message 6
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| Subject: | Re: 68/72 Sterba Propeller Perf Numbers |
Supposed to rain Friday but I will try to get a test flight in to see how we compare.
Jim
----- Original Message -----
From: IslPilot@aol.com
To: tailwind-list@matronics.com
Sent: Thursday, April 21, 2005 8:40 PM
Subject: Re: Tailwind-List: 68/72 Sterba Propeller Perf Numbers
Went out with my pad and paper today and took a friend down to Port Huron on
the other side of the state. I wrote the numbers down for the old shaky 68/72
Sterba: The new 68/74 that I sent back for rework would wind up 150+ rpm over
these figures but is very smooth.
Static: 2420
Temp: +10C
Altitude 2500'
Max RPM 2810
Manifold Pressure: 28"
Indicating: 190 mph
18 gals and 280 lbs in the plane.
Paul
CVX
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