Today's Message Index:
----------------------
1. 06:46 AM - Prop Pitch (george.mueller@aurora.org)
2. 07:46 AM - Re: Prop Pitch (John Short)
3. 08:50 AM - Re: Prop Pitch (Zed Smith)
4. 08:51 AM - Re: Prop Pitch (Zed Smith)
5. 08:52 AM - Chat Reminder (George Race)
6. 12:07 PM - Re: Prop Pitch (Tommy Walker)
7. 12:39 PM - 701 wheels and breaks for sale! (Brady)
8. 06:13 PM - firewall sealant (philip smith)
Message 1
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Is there anyone on this list with a flying 701 with a Rotax 912UL (80HP)
and a warp drive three blade prop? What pitch (measured at the tips) do
you have on the prop and what kind of climb and cruise are you seeing?
With me (230 lbs), my BRS chute and full tanks I am about 50 lbs shy of
gross and am seeing 500 fpm climb and 75 mph cruise at about 5400 rpm. Is
this normal performance? I only have about 5 degrees pitch on the prop
which gives me 5650 rpm with full throttle in straight and level flight at
about 2000 MSL.
George in Milwaukee
N701GM 55hours flying
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Message 2
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Seems like I recall others setting @ 12 deg. but not 100% sure as I do
not have this set up.
John (Scratch building 701) 50% done/100% to go
Kaufman, Tx
----- Original Message -----
From: george.mueller@aurora.org
To: zenith701801-list@matronics.com
Sent: Monday, December 01, 2008 8:41 AM
Subject: Zenith701801-List: Prop Pitch
Is there anyone on this list with a flying 701 with a Rotax 912UL
(80HP) and a warp drive three blade prop? What pitch (measured at the
tips) do you have on the prop and what kind of climb and cruise are you
seeing? With me (230 lbs), my BRS chute and full tanks I am about 50
lbs shy of gross and am seeing 500 fpm climb and 75 mph cruise at about
5400 rpm. Is this normal performance? I only have about 5 degrees
pitch on the prop which gives me 5650 rpm with full throttle in straight
and level flight at about 2000 MSL.
George in Milwaukee
N701GM 55hours flying
CONFIDENTIALITY NOTICE: This email, including any attachments, is for
the sole use of the intended recipient/s and may contain confidential
and privileged information. Any unauthorized review, use, disclosure,
or distribution is prohibited. If you are not the intended recipient,
please contact the sender by phone or return email and destroy all
copies of the original message.
Message 3
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George,
I'm in the office, not anywhere near a prop, so this is from faint memory.
First of all, I do recall that it was something on the order of 15 degrees but
definitely not measured at the tip.
Mine is a 912, three-blade Warp Drive, RPM limited to 5500.
Long version of old story:
Prop came with the Warp protractor, but at the time an old WWII pilot/crop duster/A&P
was still alive and offering advice.
He loaned me a high-dollar prop protractor complete with wood case, and promised
to hurt me if I damaged it.
He offered that any protractor needs to be placed at the 'widest' place on a prop
in order that the protractor sit across as much width as possible to insure
repeatable measurements.
He went on to instruct that the blade being adjusted need to be 'level' using a
small bubble level each time, and at the same point on each blade; that the 'number
of degrees' will vary from station to station along the blade, and what
ends up being 'correct' is what you get.
Said differently, because the 'twist' in the blade changes as you move outboard,
the resulting protractor reading changes as you move it along the blade. Therefore,
according to this receipient of the 'Charles Taylor Award', you simply
pick a wide place, mark it with masking tape (on each blade) and apply the protractor.
Following his instructions, I set mine, then fired it up. Had too much at 20 degrees,
so I reduced it 2 degrees and tried again. Still too much. After three
more attempts I was satisfied.
A run-up on the ground gave me 5400 and slid the tires on wet grass. On takeoff
it would go to 5500 RPM at about 40 knots, but never above about 5550.
The preceeding was on a pusher airplane. On the 701 (same engine, tractor prop)
I've not done a final setting, but did set the pitch a few degrees too much
specifically to limit RPM until I'm ready to adjust it.
One other comment about measuring at the tip: My old friend was really specific
about NOT using a narrow portion of the blade.....too easy to have one or two
degrees difference between blades and then have them tracking all over the place.
He stressed that placement of the measuring device will dictate the 'reading'
you get; and that the pitch YOU get may not agree with what some other fellow
gets who placed his protractor at a different station (distance from the
hub) on the same prop.
Hope this makes sense!
Have a great week, best regards, and surely somebody will jump in with truth &
justice!
Zed
Message 4
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George,
I'm in the office, not anywhere near a prop, so this is from faint memory.
First of all, I do recall that it was something on the order of 15 degrees but
definitely not measured at the tip.
Mine is a 912, three-blade Warp Drive, RPM limited to 5500.
Long version of old story:
Prop came with the Warp protractor, but at the time an old WWII pilot/crop duster/A&P
was still alive and offering advice.
He loaned me a high-dollar prop protractor complete with wood case, and promised
to hurt me if I damaged it.
He offered that any protractor needs to be placed at the 'widest' place on a prop
in order that the protractor sit across as much width as possible to insure
repeatable measurements.
He went on to instruct that the blade being adjusted need to be 'level' using a
small bubble level each time, and at the same point on each blade; that the 'number
of degrees' will vary from station to station along the blade, and what
ends up being 'correct' is what you get.
Said differently, because the 'twist' in the blade changes as you move outboard,
the resulting protractor reading changes as you move it along the blade. Therefore,
according to this receipient of the 'Charles Taylor Award', you simply
pick a wide place, mark it with masking tape (on each blade) and apply the protractor.
Following his instructions, I set mine, then fired it up. Had too much at 20 degrees,
so I reduced it 2 degrees and tried again. Still too much. After three
more attempts I was satisfied.
A run-up on the ground gave me 5400 and slid the tires on wet grass. On takeoff
it would go to 5500 RPM at about 40 knots, but never above about 5550.
The preceeding was on a pusher airplane. On the 701 (same engine, tractor prop)
I've not done a final setting, but did set the pitch a few degrees too much
specifically to limit RPM until I'm ready to adjust it.
One other comment about measuring at the tip: My old friend was really specific
about NOT using a narrow portion of the blade.....too easy to have one or two
degrees difference between blades and then have them tracking all over the place.
He stressed that placement of the measuring device will dictate the 'reading'
you get; and that the pitch YOU get may not agree with what some other fellow
gets who placed his protractor at a different station (distance from the
hub) on the same prop.
Hope this makes sense!
Have a great week, best regards, and surely somebody will jump in with truth &
justice!
Zed
Message 5
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Please join us for ther Monday evening chat room starting around 8:00 PM
Eastern Time.
<blocked::blocked::blocked::blocked::blocked::blocked::http://www.mykitairpl
ane.com/chat/> http://www.mykitairplane.com/chat/
George
Do Not Archive
Message 6
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Hi George,
We finally set our Warp Prop at 12 degrees at the tip using the warp protractor
and the prop blades level. At gross weight with me an a pax, full fuel, we get
about 5350 rpm on climout at 60 mph and 850-900 fpm (assuming our VSI is correct).
We can easily go to 5500 rpm in level flight at max throttle. we are
cruising around 70-75 at 4800 rpm. We have a 912ULS 100 HP.
Regards,
Tommy Walker
Do Not Archive.
PS I like Zed's idea. You could measure one blade at 12 degrees at the tip, then
check the measurement at the widest part of the blade, then do the other two
at that setting.
[quote="george.mueller(at)aurora."]Is there anyone on this list with a flying 701
with a Rotax 912UL (80HP) and a warp drive three blade prop? What pitch (measured
at the tips) do you have on the prop and what kind of climb and cruise
are you seeing? With me (230 lbs), my BRS chute and full tanks I am about 50
lbs shy of gross and am seeing 500 fpm climb and 75 mph cruise at about 5400
rpm. Is this normal performance? I only have about 5 degrees pitch on the prop
which gives me 5650 rpm with full throttle in straight and level flight at
about 2000 MSL.
George in Milwaukee
N701GM 55hours flying
--------
Tommy Walker
N8701 - Anniston, AL
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=217203#217203
Message 7
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| Subject: | 701 wheels and breaks for sale! |
Hey guys,
I just wanted to let you all know that there are some 701 Wheels & breaks & tires
for sale on the zenith list.
:D
--------
Brady McCormick
Poulsbo, WA
www.magnificentmachine.com
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=217209#217209
Message 8
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| Subject: | firewall sealant |
In the past there was some discussion on sealing wiring - hoses etc that
came thru the firewall. It was mentioned that there was a product available
at your local big box hardware store. For the life of me I can't find the
notes I took on this topic- any help out there with the product name.
Thanks,
Phil
CH-701 90% done - yeh right :-)
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