Today's Message Index:
----------------------
1. 05:40 AM - Re: advice on trim mechanism (Jeff Boatright)
2. 09:31 AM - Re: Ray Allen electric trim servo (Amsafetyc)
3. 09:40 AM - Re: advice on trim mechanism (taildrags)
4. 10:44 AM - larger plans (Douwe Blumberg)
Message 1
| INDEX | Back to Main INDEX |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: advice on trim mechanism |
I have a new movie up in which I'm testing a trim system comprised of a bungee
cord and a clothesline tightener:
https://www.youtube.com/watch?v=xfUMSuEMEwc
The movie doesn't show the trim system (I will post pictures later if it really
works out). What the movie shows is that the system will hold my Piet right at
55 mph from abeam the numbers to roll out, with no input from me (other than
a short shot of throttle to clear the fence!). This was a good thing because
the sun was in my eyes and I had very little sight down the runway. The trim system
was sort of "land-o-matic"
So, my Piet is fairly easily trimmed for downwind-base-final-landing.
I played around with it at altitude, and even if I don't use the tightener "valve"
to release the bungee, I can still power up as though to do a go round. It
does require a hefty amount of forward pressure to overcome the bungee, though.
Obviously the idea is to pull the tightener valve to relieve bungee tension
when it's not needed.
I also used the system to play around in slow flight, and spent some time doing
30 degree banked lazy eights and 360s at 45-50 mph. Rock steady (though this
was in the evening, so there were no up/downdrafts and little wind).
The tightener was cheap (under $5 from Ace Hardware) and looks like this:
http://farm8.staticflickr.com/7131/7559033132_e9231e5594.jpg
Imagine the line on the left being a bungee cord hooking to the rear of the control
stick torque tube. On the right, the tightener U-ring is attached to the
control stick just below the control stick hand grip instead of to the eyebolt
in the photo. If you want to trim for "up", pull the bungee cord that sticks
out of the tightener valve. This stretches the bungee and locks it into that length.
The bungee tension holds the stick back. If you want to release that trim,
pull on the valve (it's mouth is shaped like a trumpet or trombone bell).
It's clunky to use right now, so I may optimize it a bit. However, even as it is,
it's meets my main goal of trimming for the pattern.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=432827#432827
Message 2
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Ray Allen electric trim servo |
I would be interested in seeing photos and or drawings too
John
Sent from my iPhone
> On Oct 31, 2014, at 8:37 AM, "Boatright, Jeffrey" <jeffboatright@emory.edu
> wrote:
>
> Hi Douwe,
>
> What is the servo base fastened to? Did you glue in a plate or something? A
ny photos of the installation.
>
> Thanks,
>
> Jeff
>
> --
> Jeffrey H. Boatright, PhD, FARVO
> Professor of Ophthalmology
> Emory University School of Medicine
>
> From: Douwe Blumberg <douweblumberg@earthlink.net>
> Date: Friday, October 31, 2014 at 8:08 AM
> To: "pietenpol-list@matronics.com" <pietenpol-list@matronics.com>
> Subject: Pietenpol-List: Ray Allen electric trim servo
>
> I installed a Ray Allen servo in the elevator under an inspection cover. T
he actuator rod exists the bottom and controls an approximately 10=C3=A2=82
=AC=C2=9D section of 1=C3=A2=82=AC=C2=9D extruded aluminum piano hinge.
>
> Works great, lightweight, simple, unobtrusive and there=C3=A2=82=AC=84
=A2s just a hidden switch in the cockpit.
>
> Douwe
>
>
>
>
> This e-mail message (including any attachments) is for the sole use of
> the intended recipient(s) and may contain confidential and privileged
> information. If the reader of this message is not the intended
> recipient, you are hereby notified that any dissemination, distribution
> or copying of this message (including any attachments) is strictly
> prohibited.
>
> If you have received this message in error, please contact
> the sender by reply e-mail message and destroy all copies of the
> original message (including attachments).
> ky=C2=B7=C3=A8=C5=BE=C3=9B"=C3=8D=C3=AD=C5=93=C2=A2Z+=C3=93M4=C3=93G=C3=9A
q=C3=A7(=C2=BA=C2=B8=C5=BE=C2=AEw=C2=B0r=B9=C2=AB=B0=C3=C3=93
=C3=A3=C3=A2z=C3=97=C2=A7=C2=B0K=C5-=C3=8BD=84=A2=C2=A8
=C2=A5=16=C5-=C3=AE=84=A2K=1E=C2=B6=17=C5=92j=C3=9A=C3=A8=C5=BE',.+-=15
=C3=C2=AD=C2=BA=C2=B7=C2=AC5=C2=AB=C3=A2=C2=81=C2=ABh=C2=AE=C3=9A=1B=C2=AE
=C5=92,z=C3=98^=84=A2=C2=A9=C3=B2.+-=C2=BA=C3=98=C2=A5=C5-=C3=98=C5=BE=C2
=B2=C3=8B=C5=93=C2=AB=0B=C5-=C3=8BT=C5=B8=C3=B4=C2=AEn=C3=87+=C5-
=BAb=C2=A2p+r=18=C2=AFy'=C5=A1=C2=AD=C3=88C=C2=A3 =C3=A5=C2=A1=C2=A7{
=C2=AC=C2=81=C2=AE=C5=92,x(Z=C2=B4P=10>=1A-=C2=A2=C3=88Z=C2=AD=C3=C2=A7v
k=C5=93-k=C5=93-j+y=C2=A8ky=C3=B8m=C2=B6=C5=B8=C3=C3=83=0C
&j=C3=9A=C3=A8=C5=BE',r=B0=C25=C2=AB=C3=A2=C2=81=C2=ABh=C2=AC=C3=B8
=C5=BE=C2=B5=C3=A9=C3=A9=C2=A2R=C3=A2=C2=B2=C3=98m=C2=B6=C5=B8=C3=C3=83=0C
&j=C3=9A=C3=A8=C5=BE',r=B0=C25=C2=AB=C3=A2=C2=81=C2=ABh=C2=AC=C3=B8
=C5=BE=C2=B5=C3=A9=C3=A9=C2=A2R=C3=A2=C2=B2=C3=9F=C3=9A0=04=C3=918=C3=92=02I
a=01=14=C3=A4T1$=C5=A1=84=A2=C3=A8+y=C2=AB\=C2=A2{^=C5=BE=C3'=C2=A5=C2=B2
-=C2=AFj)ZnW=C2=AF=B0=C2=ABayg=BA=16=C5-=C3=AE=C5=A1=C3
=86=C2=A1=C2=AD=C3=A7=C3=A1=C2=B6=C3=9A=7F=C3=BD=C3=BA+=C2=BAk&j=C3=9A=C3=A8
=C5=BE',r=B0=C2=A1=C2=B6=C3=9A=7F=C3=BD=C3=BA+=C2=BAk&j=C3=9A=C3=A8=C5
=BE',r=B0=C2h=C2=B8=C2=AC=C2=B4*'=C2=B6=C2=B8=BA=C2=BA=C3=98=C2
=A8=C2=9Dg=BAJ+^N=16=C2=A7=9C*.~=C5-=C3=B2=C2=A2=C3=C3-zw
=C2=AB=C2=A2=C3=AB,=C2=BA=C5=A1h=C2=AE=C3=93=1A=C2=B6=C3=90=C3=ABjY^.+-=01=C3
=99=C2=A2=C2=9D=C2=A8ky=C3=B8m=C2=B6=C5=B8=C3=C3=83=0C&j=C3=9A=C3=A8=C5=BE
',r=B0=C2r=B0=C3=AD=C2=AE&=C3=AE=C2=B6*'-=C3=9Bi=C3
=C3=BC0=C3=82f=C2=AD=C2=AE=B0=C3=A2r=C3=87(=BA=C3=B7(=C5=BE=C3=9A
=C3=A2n=C3=ABb=C2=A2=7F=C3=9A=C3=BD=C2=C3=9F=C2=A2{=7F=C2=C2=B7=C2n
=A1r=C3=BE=1Bf
Message 3
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: advice on trim mechanism |
Jeff;
This is a very interesting development. By all means, keep fiddling with it to
see if it can be made handier to use. I know I would be interested in it, because
(for example) when I fly with the tank topped off (16 gallons in the nose),
I have to hold back stick for the first hour or so till fuel burns off. It
would be handy to trim for a more neutral stick, regardless of whether or not
it was handy enough to use for trimming for approach.
I think 55-57 is the sweet spot for approach speed in smooth air in most Piets,
but 2 or 3 MPH either side of that can make a pretty significant difference in
how the approach goes. It's good to see the number that works for your Land-O-Matic
approach.
Last thing: watch out for the Hun when you're vulnerable like you were on that
approach (sun in your eyes). He'll come down right at you from high overhead
with guns blazing and you won't see him till it's too late and you hear bullets
zipping through the wood and fabric ;o)
--------
Oscar Zuniga
Medford, OR
Air Camper NX41CC "Scout"
A75 power
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=432835#432835
Message 4
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
There aren't any plans in existence for a larger fuselage (unless the UK
plans show a larger fuse, in which case they're not available here
anyways.)
A fair number of people have enlarged the fuse for the very reason you
state, but they are doing on their own. It's more complicated than it
sounds because once you change one dimensions, ten others are effected, but
it can certainly be done if your heart is set on a Piet. You'll also want
to raise the wing a few inches.
Good luck,
Douwe
Other Matronics Email List Services
These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.
-- Please support this service by making your Contribution today! --
|