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Date: Tue, 18 Sep 2007 20:13:12 -0400
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From: Bill Wade <dhc1@gwi.net>
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Subject: Re: [LML] Flap vs Aileron Edge in Level Cruise (LIVP)...Not Flush
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  My kit arrives today or tomorrow, so I can't look at the parts for 
guidance. What I did with the Navion was to level the fuselage then 
measure the flap deflection full up & down with a propeller protractor. 
A good digital level would be another option.
 Without looking up the settings for the IV-P flaps my instinct would be 
to reflex them upward as much as I could, making sure to keep them even. 
Skimming through Chapter 21 I didn't see a degree range called out but 
maybe someone who's been through the process would know where to look.
  I'm not bright enough to figure it out this morning (if ever), but it 
seems to me that the bellcrank arrangement would allow the flap range to 
be adjusted by fiddling with the relationship of the inboard pushrod 
lengths so that the bellcrank arms started and ended at different points 
in their arcs. Once travel was adjusted then the flap surfaces could be 
evened by adjusting the outboard pushrods.
  Could there be warpage in the surfaces? That could be checked by 
immobilizing the ailerons and taking a reading at each end- same for the 
flaps.
  I hope I've given you some things to think about, but I don't have any 
first-hand experience so cross-check my advice before doing anything!  
-Bill Wade

 

Jeffrey Liegner, MD wrote:
>
>
> Outboard edges of ailerons seem flush with the wingtip fairing.
>
> Again, in a neutral wings level cruise postion, no left or right turn 
> tendency, the airlerons should be (fairly) symmetric with the 
> airflow.  The left flap appears lower when fully retracted compared 
> tot he right flap.  This would give extra lift on that one side, and I 
> recall many have had a left wing heavy, which I never had.
>
> One suggestion is to move the right one up the guide as far as it will 
> go, and then move the left one up the same distance.  Balanced in 
> their additional retraction.
>
> I'm hoping to get a few knots out of the deal.  Comments?
>
> Jeff L
>
>
>
>> Jeffrey Liegner, MD wrote:
>>> I notice the aileron in neutral level position leaves a bit of 
>>> exposed flap edge (that is, they're not perfectly flush), suggesting 
>>> the flaps don't retract fully.  Needs to be studied.  In level 
>>> cruise, I indicate 189-192 KIAS at 100*F LOP.  I hear faster numbers 
>>> in other LIVP planes.
>>>
>>> What's your thoughts?  CHange the rigging, pull the flap up a bit more.
>>>
>>> Jeff L
>> Jeffrey-
>>            When you say the ailerons are neutral, are the outboard 
>> ends lined up with the wingtips and are they equal? It looks as 
>> though the LH flap may be lower than the RH. The difference may 
>> appear exaggerated by aileron deflection.
>>  My Navion was out of rig in that one flap was slightly lower than 
>> the other. The aileron on the side with the low flap had to be 
>> trimmed upward to compensate for the roll caused by the flap. 
>> Tracking straight also required opposite rudder to counter the drag 
>> from the opposed surfaces. Very draggy.
>>  -Bill Wade
>