REFLECTOR: Thrustline change

Mon Apr 1 17:12:28 CDT 2013

Carl,

Sorry for not having specific shim data for you yet, but I am certain the
shims begin on the top two engine mounts (tilting thrust line downward)
with 1" or more beginning on top. The middle shims are smaller, of course,
and with no shims on the bottom two mounts.

I'm traveling on business right now, but will get back to you when I return
next week. Good luck in your testing - I think you'll see improvement in
your take off roll. John Abrams did initial test flights and he seemed to
agree that my bird jumps off the runway. May I suggest you also give a call
to Scott Swing. He's seen it all.

Dennis Martin

On Sun, Mar 31, 2013 at 8:36 PM, David Ullman <ullman at robustdecisions.com>wrote:

> Thanks for all the feedback.  Based on it, I am going to make two changes:
> 1. change the thrust line.  I will start with about a 1/4 inch and see what
> I learn.  I will report back.
> 2. Raise the nose about an inch.  Right now when I takeoff with just me on
> board and about 1" of elevator down trim , I get to about70kts and still
> have to pull back, then pop off the runway.  The pop is dramatic enough
> that
> I warn passengers before the TO roll. I can change the setting on the nose
> wheel (Fixed gear) with a spacer behind the rubber block  (the new verison
> of rubber).  Not easy to get to, but changeable.  It will be interesting to
> see if this also affects shimmy.  I don't have much now, but this will
> change the castor angle.
>
> I expect these two changes to shorten my take off roll.  Stay tuned.
>
> ON another topic.  I wrote a few weeks ago that I was throwing a lot of oil
> out the breather.  I took the advice of some and ran the engine for a
> couple
> of hours wide open.  Believe it or not, it worked!!!  My prop and belly are
> no longer oil coated when I land.  There is a little, but an order less
> than
> there was.  I have had two flights now with minimal oil loss.  Amazing!!!
>
> David Ullman
> N444DX
> President EAA 292
> 541-760-2338
> david at davidullman.com
>
>
> -----Original Message-----
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> Subject: Reflector Digest, Vol 96, Issue 114
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> Today's Topics:
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>    1. Re:  Thrustline change (dennis.doc)
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> ----------------------------------------------------------------------
>
> Message: 1
> Date: Sun, 31 Mar 2013 10:58:08 -0600
> From: "dennis.doc" <dennis.doc at gmail.com>
> To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
> Subject: Re: REFLECTOR: Thrustline change
> Message-ID:
>         <
> CAG8_WT8Mmfj2nwbn7HY35LRG7q7Kdatc1KjRwUq_uoX76VYezw at mail.gmail.com>
> Content-Type: text/plain; charset="iso-8859-1"
>
> I added over one inch of shim to my engine mount. I called Scott Swing to
> make sure it would be OK. He told me "no problem." He and a local friend
> said there are advantages in take off and landing (more downward thrust)
> and that I could change it later if it  proved ineffective. I'm still
> flying off the 40 hours, but in the 10+ hours I've flown, no perceivable
> problems. I do notice that in cruise, while trimming the elevator 100% down
> - the trailing edge remains virtually neutral.
>
> Dennis Martin
>
>
> On Fri, Mar 29, 2013 at 11:29 AM, David Ullman
> <ullman at robustdecisions.com>wrote:
>
> > When I cruise with only me in the SEFG I have to put in 1/2 inch of down
> > trim (elevator up) or more.  This is clearly inefficient.  I already have
> > 18lb of lead in the nose and don't want to add more.  A friend suggested
> > shimming the top of the engine mount for a little downward pitch moment.
> I
> > sort of like the idea but am worried that it might increase my take off
> > distance as it will drive the canard downward a little.  He thinks it may
> > help as the engine thrust line is slight more upward.
> >
> > Any thoughts or experiences?
> >
> >
> > David Ullman
> > N444DX
> > President EAA 292
> > 541-760-2338
> > david at davidullman.com
> >
> >
> >
> >
> >
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