REFLECTOR: Thrustline change

Don Johnston numa at comcast.net
Sun Mar 31 14:12:57 CDT 2013


When you say "over one inch of shim to my engine mount.", do you mean on
the upper or lower firewall mounting pads?

On Sun, Mar 31, 2013 at 11:58 AM, dennis.doc <dennis.doc at gmail.com> wrote:

> 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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>
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