Today's Message Index:
----------------------
1. 04:05 AM - Re: 701 Streamlined Strut Covers (ruruny@aol.com)
2. 05:42 PM - Streamlined Strut Covers (Joe Spencer)
3. 06:46 PM - Re: Streamlined Strut Covers (NYTerminat@aol.com)
4. 06:50 PM - Re: Streamlined Strut Covers (MacDonald Doug)
5. 07:05 PM - Re: Streamlined Strut Covers (NYTerminat@aol.com)
6. 08:40 PM - Re: Windshield rubber channel (jf3sb)
Message 1
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| Subject: | RE: 701 Streamlined Strut Covers |
....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 ab
out
8 deg. I'm cruising about 5200 RPM at an indicated 78 MPH. Full power cl
imbout
gives me about 5400 RPM and wide open straight and level gives me about 58
00
RPM.
Doug,
I have an 80 hp rotax 912, 68" warp drive prop 3 blade with no nickel lea
ding edges.
Originally the prop was 70" as I was planning on the 912s. When I got the
912 I called
warp drive and they recommended the prop 68". I sent it back and they cut
the blades down
for $10 each.
I originally set my prop pitch for 11.5 deg as this seemed the consensus
for what most people
were running but I could only get 4800rpm at full throttle climb. She clim
bed ok but the cruise was
awesome in the 90s. According to many on the rotax-list I was lugging engi
ne. The next flights I
decreased the pitch by 1 deg gaining 200 rpm on each adjustment but loosin
g cruise performance.
I ended up with 8.5 deg with 5700 climb and about 75mph cruise at 5200 rpm
.
Brian
Message 2
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| Subject: | Streamlined Strut Covers |
>>>Any suggestions other than removing my slats? They are staying where
they are.
Doug MacDonald
CH-701 from scratch
NW Ontario, Canada
Hi Bob
The TAS of my plane increased 5 mph from adding the strut cuffs. The
sink decreased and the climb increased also. I did numerous GPS box
patterns under varying conditions over several days and finally averaged
all the numbers for what should be an accurate real world speed. I never
have been able to accurately judge a mod with just one or a few flights.
I suppose one could actually decrease the speed of his plane with the
addition of the cuffs. Or induce unwanted pitch or roll inputs. Not to
overstate the obvious, but they have to be accurately aligned with the
relative wind and one another for maximum benefit. I guessed at it and
decided to use the top of the fuse for a reference and must have lucked
out. I set the chord of the cuffs parallel with that reference and
carefully aligned with one another(made a fixture for all that). Those
cuffs would make fine trim tabs, able to affect roll and pitch and
create considerable drag if not properly aligned . I didn't get any
unwanted trim inputs. Maybe you did all that already; just food for
thought...
Good luck
Joe in Mississippi
Message 3
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| Subject: | Re: Streamlined Strut Covers |
Doug,
My 701 increased about 4 mph. I agree that the positioning of them is
critical. What did you use to align the strut fairings?
Bob Spudis
N701ZX CH701 912S
In a message dated 5/16/2011 8:42:37 P.M. Eastern Daylight Time,
jpspencer@cableone.net writes:
>>>Any suggestions other than removing my slats? They are staying where
they are.
Doug MacDonald
CH-701 from scratch
NW Ontario, Canada
Hi Bob
The TAS of my plane increased 5 mph from adding the strut cuffs. The sink
decreased and the climb increased also. I did numerous GPS box patterns
under varying conditions over several days and finally averaged all the
numbers for what should be an accurate real world speed. I never have been able
to accurately judge a mod with just one or a few flights.
I suppose one could actually decrease the speed of his plane with the
addition of the cuffs. Or induce unwanted pitch or roll inputs. Not to
overstate the obvious, but they have to be accurately aligned with the relative
wind and one another for maximum benefit. I guessed at it and decided to use
the top of the fuse for a reference and must have lucked out. I set the
chord of the cuffs parallel with that reference and carefully aligned with one
another(made a fixture for all that). Those cuffs would make fine trim tabs,
able to affect roll and pitch and create considerable drag if not
properly aligned . I didn't get any unwanted trim inputs. Maybe you did all that
already; just food for thought...
Good luck
Joe in Mississippi
(http://www.matronics.com/Navigator?Zenith701801-List)
(http://www.matronics.com/contribution)
Message 4
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| Subject: | Re: Streamlined Strut Covers |
I was careful when aligning my streamlined covers. Their installation has had
no negative effect on the control of the plane.
I added one degree of pitch today, up to nine, that added about 1 MPH (as near
as I can tell in the thermally air we had today). It reduced my T/O RPM by
about 200 RPM to 5200. That is the minimum full power RPM recommended by
Rotax. My full power, straight and level is now 5600 so I don't need to worry
about overspeeding the engine. I don't know what effect this has had on my
climb because of the thermals.
I'm just going to have to accept that this plane is going to be an 80 mph
aircraft. That's fine. It certainly is not the lightest example of a 701 with
an empty weight of 667 lbs. Maybe I should loose 30 or so lbs and see what that
does to my cruise.
Thanks for all of your input guys.
Doug MacDonald
CH-701 from scratch
NW Ontario, Canada
________________________________
From: Joe Spencer <jpspencer@cableone.net>
Sent: Mon, May 16, 2011 7:39:28 PM
Subject: Zenith701801-List: Streamlined Strut Covers
>>>Any suggestions other than removing my slats? They are staying where they
>>are.
Doug MacDonald
CH-701 from scratch
NW Ontario, Canada
Hi Bob
The TAS of my plane increased 5 mph from adding the strut cuffs. The sink
decreased and the climb increased also. I did numerous GPS box patterns under
varying conditions over several days and finally averaged all the numbers for
what should be an accurate real world speed. I never have been able to
accurately judge a mod with just one or a few flights.
I suppose one could actually decrease the speed of his plane with the addition
of the cuffs. Or induce unwanted pitch or roll inputs. Not to overstate the
obvious, but they have to be accurately aligned with the relative wind and one
another for maximum benefit. I guessed at it and decided to use the top of the
fuse for a reference and must have lucked out. I set the chord of the cuffs
parallel with that reference and carefully aligned with one another(made a
fixture for all that). Those cuffs would make fine trim tabs, able to affect
roll and pitch and create considerable drag if not properly aligned . I didn't
get any unwanted trim inputs. Maybe you did all that already; just food for
thought...
Good luck
Joe in Mississippi
Message 5
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| Subject: | Re: Streamlined Strut Covers |
Is there any way to change the angle of the strut covers? They may not have
a negative effect but they are not reducing the drag on the round struts.
I know what you mean about loosing weight:) I should also take that advice.
Bob Spudis
In a message dated 5/16/2011 9:50:45 P.M. Eastern Daylight Time,
dougsnash@yahoo.com writes:
I was careful when aligning my streamlined covers. Their installation has
had no negative effect on the control of the plane.
I added one degree of pitch today, up to nine, that added about 1 MPH (as
near as I can tell in the thermally air we had today). It reduced my T/O
RPM by about 200 RPM to 5200. That is the minimum full power RPM
recommended by Rotax. My full power, straight and level is now 5600 so I don't
need
to worry about overspeeding the engine. I don't know what effect this has
had on my climb because of the thermals.
I'm just going to have to accept that this plane is going to be an 80 mph
aircraft. That's fine. It certainly is not the lightest example of a 701
with an empty weight of 667 lbs. Maybe I should loose 30 or so lbs and see
what that does to my cruise.
Thanks for all of your input guys.
Doug MacDonald
CH-701 from scratch
NW Ontario, Canada
____________________________________
From: Joe Spencer <jpspencer@cableone.net>
Sent: Mon, May 16, 2011 7:39:28 PM
Subject: Zenith701801-List: Streamlined Strut Covers
>>>Any suggestions other than removing my slats? They are staying where
they are.
Doug MacDonald
CH-701 from scratch
NW Ontario, Canada
Hi Bob
The TAS of my plane increased 5 mph from adding the strut cuffs. The sink
decreased and the climb increased also. I did numerous GPS box patterns
under varying conditions over several days and finally averaged all the
numbers for what should be an accurate real world speed. I never have been able
to accurately judge a mod with just one or a few flights.
I suppose one could actually decrease the speed of his plane with the
addition of the cuffs. Or induce unwanted pitch or roll inputs. Not to
overstate the obvious, but they have to be accurately aligned with the relative
wind and one another for maximum benefit. I guessed at it and decided to use
the top of the fuse for a reference and must have lucked out. I set the
chord of the cuffs parallel with that reference and carefully aligned with one
another(made a fixture for all that). Those cuffs would make fine trim tabs,
able to affect roll and pitch and create considerable drag if not
properly aligned . I didn't get any unwanted trim inputs. Maybe you did all that
already; just food for thought...
Good luck
Joe in Mississippi
(http://www.matronics.com/Navigator?Zenith701801-List)
(http://www.matronics.com/contribution)
Message 6
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| Subject: | Re: Windshield rubber channel |
I took a page from Bobkat's book and made a trim piece by laying up fiberglass
around the joint between the windscreen and the glareshield/cowl/sides. I'll
bridge the seam with vinyl striping tape, then cover it with the trim piece.
Will be light, waterproof, and will look reasonably sharp too. Its a good way
to go if you have the patience to mess with it. Otherwise, I'd tape it up
and go flying...
John
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http://forums.matronics.com/viewtopic.php?p=340082#340082
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