Today's Message Index:
----------------------
1. 05:55 AM - Re: 0-320 installed in W-8 (Boud Kuenen)
2. 12:42 PM - W-8 (john)
3. 03:36 PM - Re: W-8 (Walter Critchlow)
4. 05:34 PM - Re: W-8 (Earl Luce)
5. 07:16 PM - Re: W-8 (flamini2)
Message 1
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| Subject: | Re: 0-320 installed in W-8 |
--> Tailwind-List message posted by: "Boud Kuenen" <bkuenen@horizonaero.com>
Gary,
The W-8 airframe is about 7 inches shorter than a W-10 and it has less
horizontal stabilizer area as well as different design horizontal stabilizer
incidence. If you assume that your weight and balance will be OK (which it
won't), the higher speed will cause a higher wing torsion moment on the
airframe which will require a greater balancing force from the horizontal
stabilizer. This means you will have to reset the leading edge of the tail
down. This will cause greater trim drag, and reduce the amount of nose-down
force available for such tings as high angle of attach recovery. The net
increase in airspeed will not be what you might expect and you will
substantialy reduce the stability of the airplane. In certified airplanes
that went to bigger engines over the years, (like cessna 210 and Piper
Comanche) the solution was/is a complicated system of balance springs and
bob weights attached to the elevator system; certainly not what you want to
put in a Tailwind. If you compute the numbers on horsepower only, (forget
increased weight, cooling drag, trim drag, propeller efficiency, etc.) the
expected speed increase from a 150 hp engine would be about 18%, but given
everything else thats involved, it probably wouldn't even be 10%. Also ,
you would have an airplane that is less stable, feel sluggish on the
controls (especially in pitch), have less useful load and range, etc., etc.
See why Steve said, "keep it light"? In my opinion, a W-8 is one of the
best airplanes ever designed for 85-100 hp, keep it that way.
Boud Kuenen
NX888WT
----- Original Message -----
From: "Gary Fincher" <backcountry@peedeeworld.net>
Subject: Tailwind-List: 0-320 installed in W-8
> --> Tailwind-List message posted by: "Gary Fincher"
<backcountry@peedeeworld.net>
>
> I have a W-8 with a C-90 and am interested in installing a 0-320. I was
told that the W-8 wasn't designed for the 0-320 to be installed. Is there
any out there flying? If so what needs to be done? Any replies will be
appreciated. Thanks, Gary Fincher
>
>
Message 2
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--> Tailwind-List message posted by: "john" <frmrjohn@netonecom.net>
I have a W-8 project that I bought several years ago and will probably work
on it after the W-10 is completed. Question, is anyone getting near the 150
mph on the c-85 engine as is stated in Steves material. Curious. JohnD
Message 3
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--> Tailwind-List message posted by: "Walter Critchlow" <wjc1@sprint.ca>
----- Original Message -----
From: "john" <frmrjohn@netonecom.net>
Subject: Tailwind-List: W-8
> --> Tailwind-List message posted by: "john" <frmrjohn@netonecom.net>
>
> I have a W-8 project that I bought several years ago and will probably
work
> on it after the W-10 is completed. Question, is anyone getting near the
150
> mph on the c-85 engine as is stated in Steves material. Curious. JohnD
>
>
Message 4
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--> Tailwind-List message posted by: "Earl Luce" <luceair@att.net>
John D
My friend 's tailwind with a 0-200 would cruise 155 @ 2450rpm . I really
liked the way it handled , it felt just like my TW with a 0-320. The only
difference is take off and climb rate seems a little weak and runway
requirements are more. The landings are slower and more manageable with the
reduced engine weight , it puts the cg back a bit farther. I don't the 85
would be much different.
Earl Luce
Buttercup - N18263
TW- NX 264 WM
----- Original Message -----
From: "Walter Critchlow" <wjc1@sprint.ca>
Subject: Re: Tailwind-List: W-8
> --> Tailwind-List message posted by: "Walter Critchlow" <wjc1@sprint.ca>
>
>
> ----- Original Message -----
> From: "john" <frmrjohn@netonecom.net>
> To: "tailwind" <tailwind-list@matronics.com>
> Subject: Tailwind-List: W-8
>
>
> > --> Tailwind-List message posted by: "john" <frmrjohn@netonecom.net>
> >
> > I have a W-8 project that I bought several years ago and will probably
> work
> > on it after the W-10 is completed. Question, is anyone getting near the
> 150
> > mph on the c-85 engine as is stated in Steves material. Curious. JohnD
> >
> >
>
>
Message 5
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--> Tailwind-List message posted by: "flamini2" <flamini2@attbi.com>
John, Here is an old post with race speeds that would be about the same as
full throttle at 7500ft and 75% power cruise.
All this talk about speed has me going through old Sport Aviations back to
1963, Steve won the Lowers, Baker,Falk speed, payload,fastest lap
competition in 1978 with lap speed of 194.32mph so we are not doing much
better today, That sounds good but in the following years no TW's were
entered and by 1985 the fastest lap was won by AJ Smith at 231.61mph.
TW's in recent Sun 100 races at Sun-n- Fun
1991 Hiram Douglas 85 hp 161.18 mph
1993 Lance Truax 90 hp 149.60 mph
1994 Lance Truax 90 hp 160.61 mph
1997 Larry Pennoch 85 hp 149.13 mph this was in the Copperstate Dash
2000 Dennis Flamini 180 hp 195.89 mph
2000 Jim Guildi 85 hp they missed clocking him at the finish but
we calc his time=abt 160 mph
As a note in 2001 a 180hp RV-6 did 203.03 kts or 233.48 mph going to be
tough to beat but a challenge for JC!!!
Any of you racers on this list want to comment on your adventures?
Dennis Flamini N564DF race #53 Chicago
----- Original Message -----
From: "john" <frmrjohn@netonecom.net>
Subject: Tailwind-List: W-8
> --> Tailwind-List message posted by: "john" <frmrjohn@netonecom.net>
>
> I have a W-8 project that I bought several years ago and will probably
work
> on it after the W-10 is completed. Question, is anyone getting near the
150
> mph on the c-85 engine as is stated in Steves material. Curious. JohnD
>
>
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