Today's Message Index:
----------------------
1. 05:24 AM - 701 Streamlined Strut Covers (MacDonald Doug)
2. 06:00 AM - =?iso-8859-1?Q?R=E9p=2E_=3A_Zenith701801-List=3A_701_Streamlined_Strut_Co?= =?iso-8859-1?Q?vers? (Jean-Paul Roy)
3. 06:33 AM - Volks engine (Bob Gibfried)
4. 06:49 AM - Re: Volks engine (MacDonald Doug)
5. 07:20 AM - Re: Volks engine (David L. Orr)
6. 11:30 AM - Re: 701 Streamlined Strut Covers (Dan Wilde)
7. 01:08 PM - Re: 701 Streamlined Strut Covers (Tommy Walker)
8. 02:40 PM - Re: 701 Streamlined Strut Covers (dashwood)
9. 07:56 PM - Re: 701 Streamlined Strut Covers (MacDonald Doug)
Message 1
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| Subject: | 701 Streamlined Strut Covers |
I finished installing the streamlined strut covers on my CH-701 yesterday. Many
701 builders suggested this was good for between five and eight MPH increase
in cruise. Honestly, I'm not sure I got even one MPH cruise increase.
Where I did get a significant improvement was in the slow speed end of the cruve.
Before the plane would start to get a bit mushy with a climbout speed of about
40 MPH indicated. Not ready to stall, just not as solid as say 55 MPH.
Now I can pull the nose up to 30 MPH and the plane feels rock solid.
I did some stalls with this new configuration and was amazed to be falling vertically
with almost no forward movement. This was an illusion caused by a stiff
headwind but was still "Totally Cool." The stall comes on with minor buffet
at about 20 MPH indicated with no flaps. Essentially below the white arc on
my airspeed indicator.
Another advantage to the strut covers is they look fantastic. I wasn't sure how
they were going to turn out but am thoroughly impressed. I think I'm going
to take some pictures today.
So the question is, am I missing something that caused the limited increase in
cruise performance? I have the 80hp Rotax with a three blade Warp Drive prop.
The blades are 70 in diameter, have nickle leading edges and are set to about
8 deg. I'm cruising about 5200 RPM at an indicated 78 MPH. Full power climbout
gives me about 5400 RPM and wide open straight and level gives me about 5800
RPM. I didn't try a speed run last night at full power because of the stiff
wind.
Any suggestions other than removing my slats? They are staying where they are.
Doug MacDonald
CH-701 from scratch
NW Ontario, Canada
Do not archive
Message 2
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| Subject: | =?iso-8859-1?Q?R=E9p=2E_=3A_Zenith701801-List=3A_701_Streamlined_Strut_Co?= |
=?iso-8859-1?Q?vers?
Good post Doug,,,very interesting. Thanks
Jean-Paul
--- En date de-: Dim, 15.5.11, MacDonald Doug <dougsnash@yahoo.com> a =E9
crit-:
De-: MacDonald Doug <dougsnash@yahoo.com>
Objet-: Zenith701801-List: 701 Streamlined Strut Covers
=C0-: "701 list" <zenith701801-list@matronics.com>
m>
I finished installing the streamlined strut covers on my CH-701 yesterday.
- Many 701 builders suggested this was good for between five and eight MP
H increase in cruise.- Honestly, I'm not sure I got even one MPH cruise i
ncrease.-
Where I did get a significant improvement was in the slow speed end of the
cruve.- Before the plane would start to get a bit mushy with a climbout s
peed of about 40 MPH indicated.- Not ready to stall, just not as solid as
say 55 MPH.- Now I can pull the nose up to 30 MPH and the plane feels ro
ck solid.
I did some stalls with this new configuration and was amazed to be falling
vertically with almost no forward movement.- This was an illusion caused
by a stiff headwind but was still "Totally Cool."- The stall comes on wit
h minor buffet at about 20 MPH indicated with no flaps.- Essentially belo
w the white arc on my airspeed indicator.
Another advantage to the strut covers is they look fantastic.- I wasn't s
ure how they were going to turn out but am thoroughly impressed.- I think
I'm going to take some pictures today.
So the question is, am I missing something that caused the limited increase
in cruise performance?- I have the 80hp Rotax with a three blade Warp Dr
ive prop.- The blades are 70 in diameter, have nickle leading edges and a
re set to about 8 deg.- I'm cruising about 5200 RPM at an indicated 78 MP
H.- Full power climbout gives me about 5400 RPM and wide open straight an
d level gives me about 5800 RPM.- I didn't try a speed run last night at
full power because of the stiff wind.
Any suggestions other than removing my slats?- They are staying where the
y are.
Doug MacDonald
CH-701 from scratch
NW Ontario, Canada
Do not archive
le, List Admin.
Message 3
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Can anyone recommend a website for the Volks aircraft engine?
Can't seem to find anything other than the Great Plains site.
Bob
Message 4
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| Subject: | Re: Volks engine |
http://www.aeroconversions.com/
For the Aero-V from Sonex
http://www.culverprops.com/menu.htm
For Valley Engineering
Doug MacDonald
Do not Archive
- On Sun, 5/15/11, Bob Gibfried <rfg842@cox.net> wrote:
> From: Bob Gibfried <rfg842@cox.net>
> Subject: Zenith701801-List: Volks engine
> To: zenith701801-list@matronics.com
> Received: Sunday, May 15, 2011, 8:30 AM
> --> Zenith701801-List message
> posted by: "Bob Gibfried" <rfg842@cox.net>
>
>
> Can anyone recommend a website for the Volks aircraft
> engine?
>
> Can't seem to find anything other than the Great Plains
> site.
>
> Bob
>
Message 5
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| Subject: | Re: Volks engine |
Don't forget: Revmaster,
http://www.revmasteraviation.com/
and Limbach:
http://www.limflug.de/?gclid=CL6Div2S6qgCFUff4AodTnpvDQ
Message 6
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| Subject: | Re: 701 Streamlined Strut Covers |
On 5/15/2011 5:22 AM, MacDonald Doug wrote:
> --> Zenith701801-List message posted by: MacDonald Doug<dougsnash@yahoo.com>
>
> I finished installing the streamlined strut covers on my CH-701 yesterday. Many
701 builders suggested this was good for between five and eight MPH increase
in cruise. Honestly, I'm not sure I got even one MPH cruise increase.
>
> Where I did get a significant improvement was in the slow speed end of the cruve.
Before the plane would start to get a bit mushy with a climbout speed of
about 40 MPH indicated. Not ready to stall, just not as solid as say 55 MPH.
Now I can pull the nose up to 30 MPH and the plane feels rock solid.
>
> I did some stalls with this new configuration and was amazed to be falling vertically
with almost no forward movement. This was an illusion caused by a stiff
headwind but was still "Totally Cool." The stall comes on with minor buffet
at about 20 MPH indicated with no flaps. Essentially below the white arc on
my airspeed indicator.
>
> Another advantage to the strut covers is they look fantastic. I wasn't sure
how they were going to turn out but am thoroughly impressed. I think I'm going
to take some pictures today.
>
> So the question is, am I missing something that caused the limited increase in
cruise performance? I have the 80hp Rotax with a three blade Warp Drive prop.
The blades are 70 in diameter, have nickle leading edges and are set to about
8 deg. I'm cruising about 5200 RPM at an indicated 78 MPH. Full power climbout
gives me about 5400 RPM and wide open straight and level gives me about
5800 RPM. I didn't try a speed run last night at full power because of the stiff
wind.
>
> Any suggestions other than removing my slats? They are staying where they are.
>
> Doug MacDonald
> CH-701 from scratch
> NW Ontario, Canada
>
> Do not archive
>
Doug: After some time on mine, I believe I got about 4 more mph for the
same throttle setting. I can cruise at 85 mph at 5200 rpm with no
problem with a 912S and the prop is set at 11.5 degrees. I don't know
if it is just me but it seems to float more on landing with the strut
covers on. This is a 701 so we are talking about only another 20 feet
before touchdown. Or it could be just bad technique on my part.
Dan Wilde
Message 7
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| Subject: | 701 Streamlined Strut Covers |
Doug,
We had about a 11.5 degree setting with our warp/rotax setup. I believe we
set it to get about 5200 rpm on the ground. I'm surprised you have such a
shallow prop pitch. Our's was a 912S though, so maybe that was the
difference.
Sorry about introducing a new subject into this thread.
Tommy Walker in Alabama
> --> Zenith701801-List message posted by: MacDonald
> --> Doug<dougsnash@yahoo.com>
>
> So the question is, am I missing something that caused the limited
increase in cruise performance? I have the 80hp Rotax with a three blade
Warp Drive prop. The blades are 70 in diameter, have nickle leading edges
and are set to about 8 deg. I'm cruising about 5200 RPM at an indicated 78
MPH. Full power climbout gives me about 5400 RPM and wide open straight and
level gives me about 5800 RPM. I didn't try a speed run last night at full
power because of the stiff wind.
>
Message 8
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| Subject: | Re: 701 Streamlined Strut Covers |
i am running a t6041 warp on a 912 set to 12deg. this is in the record book for
the plane but i seem to recall the builder sampling up to 14deg. and settling
back to 12 or slightly above.i don't think i have ever run a full power tied
down run up. too scary for me I'm sure the builder did . his rendition of when
the rope broke is a hoot. i do get takeoff rpm of 5200 to 5250rpm at 60indicated.
a 50mph indicated climb may be a little less at around 5180. level flight
will always start at 5280 and will gradually creep to 5400. slight nose down
will bring on the 5500rpm over rev warning light and sounder. i always have
to decrease throttle in decline. i consistently cruse at 85 to 90mph indicated.
i am disappointed if the gps doesn't read a solid 90mph ground speed. one thing
i have learned in my short flying experience is the air speed indicator vary
greatly from one plane to the next. a formation flight of several planes will
get you as many airspeed reports as there are planes.
--------
Ross Aalexander: CH701 driver 912ul 490tt
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=339940#339940
Message 9
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| Subject: | 701 Streamlined Strut Covers |
Tommy, I think I have two things working against my prop pitch. First is the 80
hp instead of 100 hp. Second is the 70 inch prop as opposed to the 68 that
most people run. I chose the longer prop because I plan on going with floats
someday. I'm kind of regretting that descision now.
I'm going to try and put a little more pitch back in. I've tried a few different
settings from up near 11 back down to the 8 I have now. Maybe 8.5 or 9 might
work better with the less airframe drag I have now.
Thanks to everyone for the feedback.
Doug MacDonald
CH-701 scratch
NW Ontario, Canada
Do Not Archive
--- On Sun, 5/15/11, Tommy Walker <twalker@cableone.net> wrote:
> posted by: "Tommy Walker" <twalker@cableone.net>
>
> Doug,
>
> We had about a 11.5 degree setting with our warp/rotax
> setup. I believe we
> set it to get about 5200 rpm on the ground. I'm
> surprised you have such a
> shallow prop pitch. Our's was a 912S though, so maybe
> that was the
> difference.
> Sorry about introducing a new subject into this thread.
>
> Tommy Walker in Alabama
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