REFLECTOR: Another aerodynamic question
Dave Philipsen
velocity at davebiz.com
Sat Jul 8 15:51:58 CDT 2006
Thanks, everyone, for your replies. I'll have to take a closer look at
everything when I get a chance. From what I remember seeing, I don't
recall that there was any easy way of adjusting the elevators
separately. I think the control rod / shaft or whatever you call it is
solid between both elevators so it seems that the bell crank would have
to be removed an perhaps re-drilled. I'm not too familiar with how it
all goes together so I'm just guessing here. I went out to the hangar
today and looked at it again. It seems the disparity is probably 3/16
of an inch or less and that's assuming that the canard itself is
straight and level.
Alex Balic wrote:
> I think that the problem that Dave has is that the elevators are not lined
> up with each other- this could be more difficult to fix- other than welding
> and re-drilling, the elevators are fixed in position to their bell crank
> arms, so changing the rod end would move them both the dame distance- not
> too sure how to move just one- and it would certainly cause a rolling moment
> if one since of the canard is generating more lift than the other....
>
> -----Original Message-----
> From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
> Behalf Of Scott Derrick
> Sent: Saturday, July 08, 2006 8:59 AM
> To: Velocity Aircraft Owners and Builders list
> Subject: Re: REFLECTOR: Another aerodynamic question
>
> Dave,
>
> The elevators can get out of alignment. Its easy to adjust. Under the
> panel is a long 3/8 bolt that attaches the two elevators together, there
> is a spacer and the control rod end between the two elevator attach
> tabs, loosen the bolt/nut. Either move the elevators so they are even,
> or have somebody outside hold them so they are even, then tighten the
> bolt.
>
> If this doesn't make sense just look under the panel, follow the
> elevator control rod from the stick up to the elevator and you will see
> how they are attached together and how the adjustment can be made.
>
> Scott
>
> Dave Philipsen wrote:
>
>> I was doing a little 'transition training' today with Curt Smith, a CFI
>> in southern IL who also happens to be a Cozy flyer. We slowed the Velo
>> down until we started to get the slight oscillation in pitch from the
>> canard as it started to stall. With the two of us and full fuel, the
>> airspeed indicator indicated that to be about 65-70 kts. At this slow
>> speed, we both noticed a tendency for the plane to roll to the left a
>> little. The roll could be corrected with a little right rudder but the
>> response from the ailerons was a bit sluggish at that slow speed. We
>> also noticed that the trailing edge of the canard elevator is just a bit
>> higher on the right side than on the left. It seemed to be maybe
>> 1/4-inch to 3/8-inch higher. My first question is: can this be
>> adjusted out? Secondly: Could it be the cause of the left rolling
>> tendency near canard stall speed? I also noticed just a slight left
>> turning tendency even at cruise. My ailerons appear to be flush with
>> both wings at their neutral position.
>>
>>
>>
>
>
--
Dave Philipsen
STDFG
N171SP
soon-to-be N83DP
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