Herr Pitts Special Kit - Upper and lower wings not parellel... will it affect performance?  
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All Forums >> RC Airplanes >> Aerodynamics >> Herr Pitts Special Kit - Upper and lower wings not parellel... will it affect performance?
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Herr Pitts Special Kit - Upper and lower wings not pare... - 1/29/2008 10:39:02 PM   
somegeek



Posts: 2084
Joined: 8/1/2005
From: Vancouver, WA, USA
Status: offline 		Finishing up a Herr Pitts Special and hit a bit of a potential snag... Got the wing cabanes sanded and fit and the port side cabane is 1/8" short to span the gap between the wings so I added a piece to take up the slack... and then started wondering if this 1/8" difference will make a big impact on flying with this plane? The empanage is squared up with the upper wing. The lower wing is the surface which is off slightly.





Truing up the lower wing would involve altering the lower wing saddle with a shim and then altering the length of the cabanes to match. Looks like I put a little less dihedral than what was called for and the mounting in the saddle is a bit off. On the grand scheme of things, would this be worth the trouble?

somegeek

_____________________________

Fly safe, have fun. Measure three times, cut once. The man who makes no mistakes does not usually make anything.
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RE: Herr Pitts Special Kit - Upper and lower wings not... - 1/30/2008 7:18:00 AM   
pimmnz


 

Posts: 493
Joined: 11/9/2005
From: Auckland, NEW ZEALAND
Status: offline 		Probably not. Of more concern will be squareness of the wings to each other and the fuselage centreline and equal length either side. 1/8" difference in the wing strut length will be peanuts compared to getting one of them wrong in terms of effect when flying.
Evan, WB #12.

(in reply to somegeek)
       Post #: 2

RE: Herr Pitts Special Kit - Upper and lower wings not... - 1/31/2008 1:23:56 AM   
somegeek



Posts: 2084
Joined: 8/1/2005
From: Vancouver, WA, USA
Status: offline 		Thanks for the reply! The upper wing and empanage are squared up to each other and centered. The lower wing is squared up to the empanage and centered on the fuselage as well. Confirmed this before I drilled the mounting holes... apparently I didn't confirm the dihedral when framing up the lower wing close enough.

Measure three times... glue once. Need to add that to my sig.

somegeek

< Message edited by somegeek -- 1/31/2008 1:26:26 AM >

_____________________________

Fly safe, have fun. Measure three times, cut once. The man who makes no mistakes does not usually make anything.

(in reply to pimmnz)
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RE: Herr Pitts Special Kit - Upper and lower wings not... - 1/31/2008 4:39:52 AM   
BMatthews



Posts: 8865
Joined: 10/4/2002
From: Burnaby, BC, CANADA
Status: offline 		If that's all that is out of line it won't make a huge difference. But it'll likely do some things a little better in one direction than the other. If that doesn't scare you then I doubt you'll need to do anything about it.


_____________________________

Bruce-
Proudly wasting balsa since 1965.

Free Flighters go that extra mile........

(in reply to somegeek)
       Post #: 4

RE: Herr Pitts Special Kit - Upper and lower wings not... - 1/31/2008 7:44:14 AM   
somegeek



Posts: 2084
Joined: 8/1/2005
From: Vancouver, WA, USA
Status: offline
quote:

ORIGINAL: BMatthews

If that's all that is out of line it won't make a huge difference. But it'll likely do some things a little better in one direction than the other. If that doesn't scare you then I doubt you'll need to do anything about it.


That doesn't scare me though it does sound like I half-assed this... will correct the saddle and struts so this is level. Ever get burned out on a build?

somegeek

_____________________________

Fly safe, have fun. Measure three times, cut once. The man who makes no mistakes does not usually make anything.

(in reply to BMatthews)
       Post #: 5

RE: Herr Pitts Special Kit - Upper and lower wings not... - 1/31/2008 4:05:50 PM   
da Rock



Posts: 6313
Joined: 10/11/2005
From: western, NC, USA
Status: offline 		If the lower wing bolts on, it's easy to shim one side of the saddle to true the wing to fuselage angles.

Once that is true, the cabane structure can be fixed so it's saddle hold the top wing to match the bottom.

Then one interplane strut may need some sanding and the other a saddle shim.

I applaud your wish to make it right. We need more flyers who have that pride.

(in reply to somegeek)
       Post #: 6

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