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Jim Berry
Joined: 10 Jan 2006
Posts: 237
Location: Denver
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 Posted: Thu Mar 11, 2010 7:51 pm Post subject: Elevator trim speed |
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For those flying with a single speed elevator trim servo, and satisfied with your trim response in both take-off/landing and cruise configuration: Can you tell me how much time it takes for your trim tab to go from trail position to 35* down? Thanks.
Jim Berry
40482
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rv10flyer
Joined: 25 Aug 2009
Posts: 364
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| Posted: Sat Mar 13, 2010 5:48 pm Post subject: Re: Elevator trim speed |
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10 seconds or so with 9 volt battery, as I just finished emp attachment a week or so ago(would be quicker with 12-14 volts).
I doubt anyone flying has been brave enough to try it. I have only been on demo ride with Joe Blank. Those elevators and trim tabs are huge so I doubt we'll ever use full trim tab deflection.
I am going to use switches on instrument panel just like Van's, as I don't want a coolie hat driving a relay. Parts are already paid for. KISS principal. Just one more thing to break, wires to break, then you have to have speed controller to keep it from going nuts when you accidently lay something on the coolie hat. How far from the throttle will we have to move our right hand to reach ail/elev trim switches- 2-3". I am not going to pretend I am a fighter pilot with 6+ functions on my stick. I'll carve mine out of wood. Just my opinion, none of this may apply to anyone else but thought I would reply since nobody else had yet. Happy building.
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Wayne G. |
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Jim Berry
Joined: 10 Jan 2006
Posts: 237
Location: Denver
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| Posted: Sat Mar 13, 2010 7:33 pm Post subject: Re: Elevator trim speed |
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Wayne,
Thanks for your reply. I was starting to wonder if the lack of responses was due to the fact that no one flying with a single speed elevator trim servo is satisfied with the compromise speed for take-off/landing as well as at cruise. I have the ability to adjust the speed of my trim servo on the ground and was hoping someone had found the sweet spot. It currently takes 20 seconds for my trim tab to go from trail to 35* down. That seems slow to me. I am trying to avoid first flight surprises.
Jim Berry
40482
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Tim Olson
Joined: 25 Jan 2007
Posts: 2879
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| Posted: Sat Mar 13, 2010 8:14 pm Post subject: Elevator trim speed |
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I would go dual speed for sure. It's slow enough at full speed that
on a go around or touch-n-go you fight the stick for a while. I
wouldn't settle for less than full speed in the pattern....and, full
speed is dangerously fast in cruise.
Tim
On Mar 13, 2010, at 9:33 PM, "Jim Berry" <jimberry(at)qwest.net> wrote:
| Quote: |
Wayne,
Thanks for your reply. I was starting to wonder if the lack of
responses was due to the fact that no one flying with a single speed
elevator trim servo is satisfied with the compromise speed for take-
off/landing as well as at cruise. I have the ability to adjust the
speed of my trim servo on the ground and was hoping someone had
found the sweet spot. It currently takes 20 seconds for my trim tab
to go from trail to 35* down. That seems slow to me. I am trying to
avoid first flight surprises.
Jim Berry
40482
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=290252#290252
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Tim Olson
Joined: 25 Jan 2007
Posts: 2879
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| Posted: Sat Mar 13, 2010 8:14 pm Post subject: Elevator trim speed |
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On my last flight I was alone and had full or almost full up trim upon
landing. Worked fine but I guarantee you'll want the full range.
Tim
On Mar 13, 2010, at 7:48 PM, "rv10flyer" <wayne.gillispie(at)yahoo.com>
wrote:
| Quote: |
>
10 seconds or so with 9 volt battery, as I just finished emp
attachment a week or so ago(would be quicker with 12-14 volts).
I doubt anyone flying has been brave enough to try it. I have only
been on demo ride with Joe Blank. Those elevators and trim tabs are
huge so I doubt we'll ever use full trim tab deflection.
I am going to use switches on instrument panel just like Van's, as I
don't want a coolie hat driving a relay. Parts are already paid for.
KISS principal. Just one more thing to break, wires to break, then
you have to have speed controller to keep it from going nuts when
you accidently lay something on the coolie hat. How far from the
throttle will we have to move our right hand to reach ail/elev trim
switches- 2-3". I am not going to pretend I am a fighter pilot with
6+ functions on my stick. I'll carve mine out of wood. Just my
opinion, none of this may apply to anyone else but thought I would
reply since nobody else had yet. Happy building.
--------
Wayne Gillispie
A&P 5/93, PPC 10/08
Grayson, KY
40983
Ord complete kit 8/24/09
DB Schenker del 11/20/09
Started emp 12/01/09
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=290243#290243
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rv10flyer
Joined: 25 Aug 2009
Posts: 364
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| Posted: Sat Mar 13, 2010 8:55 pm Post subject: Re: Elevator trim speed |
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I probably will not use all "nose up" trim available landing just like in the 172, so that during a go around I won't have to fight it quite as bad. I do have 35 deg per plans though.
Nice to hear from someone flying on how much trim is needed. I would have thought you would not even need half of that unless you had two people up front.
Very interesting trim set up/instructions and fun getting adjusted until you learn about the internal stops in the cables/how ends need to be positioned properly. Definitely would go with screws/nutplates on the aft bracket/nut if I had it to do over again as clearance to turn cover plate is lacking unless front nut is loosened and cable moved aft. Another hour of work before starting wings.
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Wayne G. |
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ricksked(at)cox.net
Guest
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| Posted: Sat Mar 13, 2010 9:47 pm Post subject: Elevator trim speed |
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I totally agree with Tim...plus he flight tested the failsafe system
through several loops to set the proper speed!! 
Rick
On Mar 13, 2010, at 8:07 PM, Tim Olson <Tim(at)MyRV10.com> wrote:
| Quote: |
I would go dual speed for sure. It's slow enough at full speed that
on a go around or touch-n-go you fight the stick for a while. I
wouldn't settle for less than full speed in the pattern....and, full
speed is dangerously fast in cruise.
Tim
On Mar 13, 2010, at 9:33 PM, "Jim Berry" <jimberry(at)qwest.net> wrote:
>
>
> Wayne,
>
> Thanks for your reply. I was starting to wonder if the lack of
> responses was due to the fact that no one flying with a single
> speed elevator trim servo is satisfied with the compromise speed
> for take-off/landing as well as at cruise. I have the ability to
> adjust the speed of my trim servo on the ground and was hoping
> someone had found the sweet spot. It currently takes 20 seconds for
> my trim tab to go from trail to 35* down. That seems slow to me. I
> am trying to avoid first flight surprises.
>
> Jim Berry
> 40482
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=290252#290252
>
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Tim Olson
Joined: 25 Jan 2007
Posts: 2879
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| Posted: Sat Mar 13, 2010 10:09 pm Post subject: Elevator trim speed |
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Ha!!! Yeah, that's how I get perfect loops all the time....if you
set your trim to full speed and start at 140kts you just apply 3 full
seconds of nose-up trim and that gives you the 4G pull for the loop
entry. Then you just hold on until the world looks normal again and
quickly add 3 seconds of nose down.
(just kidding, so NO, don't try that!)
Tim
Do not archive
On Mar 13, 2010, at 11:41 PM, Rick <ricksked(at)cox.net> wrote:
| Quote: |
I totally agree with Tim...plus he flight tested the failsafe system
through several loops to set the proper speed!!
Rick
On Mar 13, 2010, at 8:07 PM, Tim Olson <Tim(at)MyRV10.com> wrote:
>
>
> I would go dual speed for sure. It's slow enough at full speed
> that on a go around or touch-n-go you fight the stick for a while.
> I wouldn't settle for less than full speed in the pattern....and,
> full speed is dangerously fast in cruise.
> Tim
>
> On Mar 13, 2010, at 9:33 PM, "Jim Berry" <jimberry(at)qwest.net> wrote:
>
>>
>>
>> Wayne,
>>
>> Thanks for your reply. I was starting to wonder if the lack of
>> responses was due to the fact that no one flying with a single
>> speed elevator trim servo is satisfied with the compromise speed
>> for take-off/landing as well as at cruise. I have the ability to
>> adjust the speed of my trim servo on the ground and was hoping
>> someone had found the sweet spot. It currently takes 20 seconds
>> for my trim tab to go from trail to 35* down. That seems slow to
>> me. I am trying to avoid first flight surprises.
>>
>> Jim Berry
>> 40482
>>
>>
>>
>>
>> Read this topic online here:
>>
>> http://forums.matronics.com/viewtopic.php?p=290252#290252
>>
>>
>>
>>
>>
>>
>>
>>
>>
>
>
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http://www.matronics.com/Navigator?RV10-List |
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