Today's Message Index:
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1. 09:25 AM - Re: Trim options (Myron Truex)
2. 09:26 AM - Re: Low idle RPM recommendation on Rotax 912 UL? (Myron Truex)
Message 1
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If I needed to build another trim kit I would use the mac servo switches on
the stick again and my own actuators. The Macs have small travel distances
and are not very powerful. I used a linear actuator on my 40 foot motorhome
to provide center trimming for crosswinds and road conditions. Works great.
http://dcactuators.com/Detail.asp?Product_ID=302.130_6104T
Myron
30TX
_____
From: owner-pulsar-list-server@matronics.com
[mailto:owner-pulsar-list-server@matronics.com] On Behalf Of Brian Anderson
Sent: Friday, December 28, 2012 12:20 PM
Subject: Re: Pulsar-List: Trim options
Scott,
Scott
Trimming the position of the centre point of the pitch springs works just
fine. Many of us use a lever arrangement with the servo connected at about
the mid point of the lever, giving 2x the travel to the connection point of
the springs.
Also the very light springs used on some of the aileron trim systems is not
even noticeable, in terms of the stick force to deflect the ailerons in
flight. My system has the servo connected to a small pulley, and via a cable
to the spring on one side only. The 2x movement gain works out at exactly
the right amount of trim change to compensate for passenger and fuel loads.
Brian
On 29/12/2012, at 3:29 AM, Scott MacIntyre <scott@s-f-x.com> wrote:
Hi
Happy Xmas everyone.
Just hoping some of you guys might have trim tabs rather than the spring
bias type pitch trim system - please let me know if the details for this
build/mod are available as I found a nice linear actuator but the LAA (EAA
UK equivalent) are starting to pick holes in the design. I need 60mm of
travel so using Ray Allen servos directly is not feasible. If anyone has
aileron trim without springs that would also be of interest.
Cheers
Scott MacIntyre
href="http://www.aeroelectric.com/">www.aeroelectric.com
href="http://www.buildersbooks.com/">www.buildersbooks.com
href="http://www.homebuilthelp.com/">www.homebuilthelp.com
href="http://www.matronics.com/contribution">http://www.matronics.com/contri
bution
href="http://www.matronics.com/Navigator?Pulsar-List">http://www.matronics.c
om/Navigator?Pulsar-List
href="http://forums.matronics.com/">http://forums.matronics.com
Message 2
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| Subject: | Low idle RPM recommendation on Rotax 912 UL? |
Idling at that rpm is not great for the gear box but being able to pull the
engine back to that rpm is helpful on landings if you need to shorten the
rollout etc.
-----Original Message-----
From: owner-pulsar-list-server@matronics.com
[mailto:owner-pulsar-list-server@matronics.com] On Behalf Of HUGH COULTER
Sent: Friday, December 28, 2012 12:14 PM
Subject: Re: Pulsar-List: Low idle RPM recommendation on Rotax 912 UL?
About 1800 should be OK
Clarke
On Wed, 26 Dec 2012 13:24:55 -0800
"triumphrider" <investmentsalesconsultant@gmail.com>
wrote:
><investmentsalesconsultant@gmail.com>
>
> How low should the low idle speed be adjusted for on the
>Rotax 912 UL?
> I had someone help with it and he said 1400 rpm and if I
>pull the throttle that low, the engine shutters. I
>usually taxi at around 1800 RPMs. With the reduction gear
>of the Rotax, perhaps 1400 rpm idle is too low?
>
> Engine seems dialed in at cruise and acceleration, but a
>little rough at low idle, as if the prop is not balanced.
>I did a few small carbon fiber prop ding repairs and was
>careful not to overweight one side. Perhaps, I did it
>inadvertently? It's a Prince P-Tip. Used to purr like a
>kitten. As the Chinese say, it it's not broken don't fix
>it? It was adjusted at the conditional inspection. Is
>protection too much to expect from a 850 hr. engine? Am I
>asking too much?
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=390994#390994
>
>
>
>
>
>
>
>Admin.
>Un/Subscription,
>Forums!
>
>
>
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